feat: add external process runtime (#1799)

app/build.gradle.kts

@@ -1,3 +1,5 @@
+import kotlin.random.Random
+
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
@@ -28,6 +30,8 @@ android {
         debug {
             applicationIdSuffix = ".debug"
             resValue("string", "app_name", "ReVanced Manager Debug")
+
+            buildConfigField("long", "BUILD_ID", "${Random.nextLong()}L")
         }
 
         release {
@@ -42,6 +46,8 @@ android {
                 resValue("string", "app_name", "ReVanced Manager Debug")
                 signingConfig = signingConfigs.getByName("debug")
             }
+
+            buildConfigField("long", "BUILD_ID", "0L")
         }
     }
 
@@ -83,6 +89,12 @@ android {
     buildFeatures.buildConfig=true
 
     composeOptions.kotlinCompilerExtensionVersion = "1.5.10"
+    externalNativeBuild {
+        cmake {
+            path = file("src/main/cpp/CMakeLists.txt")
+            version = "3.22.1"
+        }
+    }
 }
 
 kotlin {
@@ -137,6 +149,13 @@ dependencies {
     implementation(libs.revanced.patcher)
     implementation(libs.revanced.library)
 
+    // Native processes
+    implementation(libs.kotlin.process)
+
+    // HiddenAPI
+    compileOnly(libs.hidden.api.stub)
+
+    // LibSU
     implementation(libs.libsu.core)
     implementation(libs.libsu.service)
     implementation(libs.libsu.nio)

app/proguard-rules.pro

@@ -26,6 +26,10 @@
     kotlinx.serialization.KSerializer serializer(...);
 }
 
+# This required for the process runtime.
+-keep class app.revanced.manager.patcher.runtime.process.* {
+  *;
+}
 # Required for the patcher to function correctly
 -keep class app.revanced.patcher.** {
   *;
@@ -45,6 +49,7 @@
 -keep class com.android.** {
   *;
 }
+-dontwarn com.google.auto.value.**
 -dontwarn java.awt.**
 -dontwarn javax.**
 -dontwarn org.slf4j.**

app/src/main/aidl/app/revanced/manager/patcher/runtime/process/IPatcherEvents.aidl

@@ -0,0 +1,11 @@
+// IPatcherEvents.aidl
+package app.revanced.manager.patcher.runtime.process;
+
+// Interface for sending events back to the main app process.
+oneway interface IPatcherEvents {
+    void log(String level, String msg);
+    void patchSucceeded();
+    void progress(String name, String state, String msg);
+    // The patching process has ended. The exceptionStackTrace is null if it finished successfully.
+    void finished(String exceptionStackTrace);
+}

app/src/main/aidl/app/revanced/manager/patcher/runtime/process/IPatcherProcess.aidl

@@ -0,0 +1,14 @@
+// IPatcherProcess.aidl
+package app.revanced.manager.patcher.runtime.process;
+
+import app.revanced.manager.patcher.runtime.process.Parameters;
+import app.revanced.manager.patcher.runtime.process.IPatcherEvents;
+
+interface IPatcherProcess {
+    // Returns BuildConfig.BUILD_ID, which is used to ensure the main app and runner process are running the same code.
+    long buildId();
+    // Makes the patcher process exit with code 0
+    oneway void exit();
+    // Starts patching.
+    oneway void start(in Parameters parameters, IPatcherEvents events);
+}

app/src/main/aidl/app/revanced/manager/patcher/runtime/process/Parameters.aidl

@@ -0,0 +1,4 @@
+// Parameters.aidl
+package app.revanced.manager.patcher.runtime.process;
+
+parcelable Parameters;

app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,38 @@
+
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html.
+# For more examples on how to use CMake, see https://github.com/android/ndk-samples.
+
+# Sets the minimum CMake version required for this project.
+cmake_minimum_required(VERSION 3.22.1)
+
+# Declares the project name. The project name can be accessed via ${ PROJECT_NAME},
+# Since this is the top level CMakeLists.txt, the project name is also accessible
+# with ${CMAKE_PROJECT_NAME} (both CMake variables are in-sync within the top level
+# build script scope).
+project("prop_override")
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+#
+# In this top level CMakeLists.txt, ${CMAKE_PROJECT_NAME} is used to define
+# the target library name; in the sub-module's CMakeLists.txt, ${PROJECT_NAME}
+# is preferred for the same purpose.
+#
+# In order to load a library into your app from Java/Kotlin, you must call
+# System.loadLibrary() and pass the name of the library defined here;
+# for GameActivity/NativeActivity derived applications, the same library name must be
+# used in the AndroidManifest.xml file.
+add_library(${CMAKE_PROJECT_NAME} SHARED
+    # List C/C++ source files with relative paths to this CMakeLists.txt.
+        prop_override.cpp)
+
+# Specifies libraries CMake should link to your target library. You
+# can link libraries from various origins, such as libraries defined in this
+# build script, prebuilt third-party libraries, or Android system libraries.
+target_link_libraries(${CMAKE_PROJECT_NAME}
+    # List libraries link to the target library
+    android
+    log)

app/src/main/cpp/prop_override.cpp

@@ -0,0 +1,62 @@
+// Library for overriding Android system properties via environment variables.
+//
+// Usage: LD_PRELOAD=prop_override.so PROP_dalvik.vm.heapsize=123M getprop dalvik.vm.heapsize
+// Output: 123M
+#include <string>
+#include <cstring>
+#include <cstdlib>
+#include <dlfcn.h>
+
+// Source: https://android.googlesource.com/platform/system/core/+/100b08a848d018eeb1caa5d5e7c7c2aaac65da15/libcutils/include/cutils/properties.h
+#define PROP_VALUE_MAX 92
+// This is the mangled name of "android::base::GetProperty".
+#define GET_PROPERTY_MANGLED_NAME "_ZN7android4base11GetPropertyERKNSt3__112basic_stringIcNS1_11char_traitsIcEENS1_9allocatorIcEEEES9_"
+
+extern "C" typedef int (*property_get_ptr)(const char *, char *, const char *);
+typedef std::string (*GetProperty_ptr)(const std::string &, const std::string &);
+
+char *GetPropOverride(const std::string &key) {
+    auto envKey = "PROP_" + key;
+
+    return getenv(envKey.c_str());
+}
+
+// See: https://android.googlesource.com/platform/system/core/+/100b08a848d018eeb1caa5d5e7c7c2aaac65da15/libcutils/properties.cpp
+extern "C" int property_get(const char *key, char *value, const char *default_value) {
+    auto replacement = GetPropOverride(std::string(key));
+    if (replacement) {
+        int len = strnlen(replacement, PROP_VALUE_MAX);
+
+        strncpy(value, replacement, len);
+        return len;
+    }
+
+    static property_get_ptr original = NULL;
+    if (!original) {
+        // Get the address of the original function.
+        original = reinterpret_cast<property_get_ptr>(dlsym(RTLD_NEXT, "property_get"));
+    }
+
+    return original(key, value, default_value);
+}
+
+// Defining android::base::GetProperty ourselves won't work because std::string has a slightly different "path" in the NDK version of the C++ standard library.
+// We can get around this by forcing the function to adopt a specific name using the asm keyword.
+std::string GetProperty(const std::string &, const std::string &) asm(GET_PROPERTY_MANGLED_NAME);
+
+
+// See: https://android.googlesource.com/platform/system/libbase/+/1a34bb67c4f3ba0a1ea6f4f20ac9fe117ba4fe64/properties.cpp
+// This isn't used for the properties we want to override, but property_get is deprecated so that could change in the future.
+std::string GetProperty(const std::string &key, const std::string &default_value) {
+    auto replacement = GetPropOverride(key);
+    if (replacement) {
+        return std::string(replacement);
+    }
+
+    static GetProperty_ptr original = NULL;
+    if (!original) {
+        original = reinterpret_cast<GetProperty_ptr>(dlsym(RTLD_NEXT, GET_PROPERTY_MANGLED_NAME));
+    }
+
+    return original(key, default_value);
+}

app/src/main/java/app/revanced/manager/domain/manager/PreferencesManager.kt

@@ -13,6 +13,8 @@ class PreferencesManager(
     val api = stringPreference("api_url", "https://api.revanced.app")
 
     val multithreadingDexFileWriter = booleanPreference("multithreading_dex_file_writer", true)
+    val useProcessRuntime = booleanPreference("use_process_runtime", false)
+    val patcherProcessMemoryLimit = intPreference("process_runtime_memory_limit", 700)
     val disablePatchVersionCompatCheck = booleanPreference("disable_patch_version_compatibility_check", false)
 
     val keystoreCommonName = stringPreference("keystore_cn", KeystoreManager.DEFAULT)

app/src/main/java/app/revanced/manager/patcher/LibraryResolver.kt

@@ -0,0 +1,10 @@
+package app.revanced.manager.patcher
+
+import android.content.Context
+import java.io.File
+
+abstract class LibraryResolver {
+    protected fun findLibrary(context: Context, searchTerm: String): File? = File(context.applicationInfo.nativeLibraryDir).run {
+        list { _, f -> !File(f).isDirectory && f.contains(searchTerm) }?.firstOrNull()?.let { resolve(it) }
+    }
+}

app/src/main/java/app/revanced/manager/patcher/Session.kt

@@ -1,23 +1,21 @@
 package app.revanced.manager.patcher
 
 import android.content.Context
-import app.revanced.library.ApkUtils
 import app.revanced.library.ApkUtils.applyTo
 import app.revanced.manager.R
-import app.revanced.manager.patcher.logger.ManagerLogger
+import app.revanced.manager.patcher.logger.Logger
 import app.revanced.manager.ui.model.State
 import app.revanced.patcher.Patcher
+import app.revanced.patcher.PatcherConfig
 import app.revanced.patcher.PatcherOptions
 import app.revanced.patcher.patch.Patch
 import app.revanced.patcher.patch.PatchResult
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.withContext
 import java.io.Closeable
 import java.io.File
 import java.nio.file.Files
 import java.nio.file.StandardCopyOption
-import java.util.logging.Logger
 
 internal typealias PatchList = List<Patch<*>>
 
@@ -27,9 +25,9 @@ class Session(
     aaptPath: String,
     multithreadingDexFileWriter: Boolean,
     private val androidContext: Context,
-    private val logger: ManagerLogger,
-    private val input: File,
-    private val patchesProgress: MutableStateFlow<Pair<Int, Int>>,
+    private val logger: Logger,
+    input: File,
+    private val onPatchCompleted: () -> Unit,
     private val onProgress: (name: String?, state: State?, message: String?) -> Unit
 ) : Closeable {
     private fun updateProgress(name: String? = null, state: State? = null, message: String? = null) =
@@ -37,9 +35,9 @@ class Session(
 
     private val tempDir = File(cacheDir).resolve("patcher").also { it.mkdirs() }
     private val patcher = Patcher(
-        PatcherOptions(
-            inputFile = input,
-            resourceCachePath = tempDir.resolve("aapt-resources"),
+        PatcherConfig(
+            apkFile = input,
+            temporaryFilesPath = tempDir,
             frameworkFileDirectory = frameworkDir,
             aaptBinaryPath = aaptPath,
             multithreadingDexFileWriter = multithreadingDexFileWriter,
@@ -71,9 +69,7 @@ class Session(
 
             nextPatchIndex++
 
-            patchesProgress.value.let {
-                patchesProgress.emit(it.copy(it.first + 1))
-            }
+            onPatchCompleted()
 
             selectedPatches.getOrNull(nextPatchIndex)?.let { nextPatch ->
                 updateProgress(
@@ -96,14 +92,16 @@ class Session(
 
     suspend fun run(output: File, selectedPatches: PatchList, integrations: List<File>) {
         updateProgress(state = State.COMPLETED) // Unpacking
-        Logger.getLogger("").apply {
+
+        java.util.logging.Logger.getLogger("").apply {
             handlers.forEach {
                 it.close()
                 removeHandler(it)
             }
 
-            addHandler(logger)
+            addHandler(logger.handler)
         }
+
         with(patcher) {
             logger.info("Merging integrations")
             acceptIntegrations(integrations.toSet())

app/src/main/java/app/revanced/manager/patcher/aapt/Aapt.kt

@@ -1,18 +1,12 @@
 package app.revanced.manager.patcher.aapt
 
 import android.content.Context
+import app.revanced.manager.patcher.LibraryResolver
 import android.os.Build.SUPPORTED_ABIS as DEVICE_ABIS
-import java.io.File
-
-object Aapt {
+object Aapt : LibraryResolver() {
     private val WORKING_ABIS = setOf("arm64-v8a", "x86", "x86_64")
 
     fun supportsDevice() = (DEVICE_ABIS intersect WORKING_ABIS).isNotEmpty()
 
-    fun binary(context: Context): File? {
-        return File(context.applicationInfo.nativeLibraryDir).resolveAapt()
-    }
+    fun binary(context: Context) = findLibrary(context, "aapt")
 }
-
-private fun File.resolveAapt() =
-    list { _, f -> !File(f).isDirectory && f.contains("aapt") }?.firstOrNull()?.let { resolve(it) }

app/src/main/java/app/revanced/manager/patcher/logger/Logger.kt

@@ -0,0 +1,37 @@
+package app.revanced.manager.patcher.logger
+
+import java.util.logging.Handler
+import java.util.logging.Level
+import java.util.logging.LogRecord
+
+abstract class Logger {
+    abstract fun log(level: LogLevel, message: String)
+
+    fun trace(msg: String) = log(LogLevel.TRACE, msg)
+    fun info(msg: String) = log(LogLevel.INFO, msg)
+    fun warn(msg: String) = log(LogLevel.WARN, msg)
+    fun error(msg: String) = log(LogLevel.ERROR, msg)
+
+    val handler = object : Handler() {
+        override fun publish(record: LogRecord) {
+            val msg = record.message
+
+            when (record.level) {
+                Level.INFO -> info(msg)
+                Level.SEVERE -> error(msg)
+                Level.WARNING -> warn(msg)
+                else -> trace(msg)
+            }
+        }
+
+        override fun flush() = Unit
+        override fun close() = Unit
+    }
+}
+
+enum class LogLevel {
+    TRACE,
+    INFO,
+    WARN,
+    ERROR,
+}

app/src/main/java/app/revanced/manager/patcher/logger/ManagerLogger.kt

@@ -1,59 +0,0 @@
-package app.revanced.manager.patcher.logger
-
-import android.util.Log
-import java.util.logging.Handler
-import java.util.logging.Level
-import java.util.logging.LogRecord
-
-class ManagerLogger : Handler() {
-    private val logs = mutableListOf<Pair<LogLevel, String>>()
-    private fun log(level: LogLevel, msg: String) {
-        level.androidLog(msg)
-        if (level == LogLevel.TRACE) return
-        logs.add(level to msg)
-    }
-
-    fun export() =
-        logs.asSequence().map { (level, msg) -> "[${level.name}]: $msg" }.joinToString("\n")
-
-    fun trace(msg: String) = log(LogLevel.TRACE, msg)
-    fun info(msg: String) = log(LogLevel.INFO, msg)
-    fun warn(msg: String) = log(LogLevel.WARN, msg)
-    fun error(msg: String) = log(LogLevel.ERROR, msg)
-    override fun publish(record: LogRecord) {
-        val msg = record.message
-        val fn = when (record.level) {
-            Level.INFO -> ::info
-            Level.SEVERE -> ::error
-            Level.WARNING -> ::warn
-            else -> ::trace
-        }
-
-        fn(msg)
-    }
-
-    override fun flush() = Unit
-
-    override fun close() = Unit
-}
-
-enum class LogLevel {
-    TRACE {
-        override fun androidLog(msg: String) = Log.v(androidTag, msg)
-    },
-    INFO {
-        override fun androidLog(msg: String) = Log.i(androidTag, msg)
-    },
-    WARN {
-        override fun androidLog(msg: String) = Log.w(androidTag, msg)
-    },
-    ERROR {
-        override fun androidLog(msg: String) = Log.e(androidTag, msg)
-    };
-
-    abstract fun androidLog(msg: String): Int
-
-    private companion object {
-        const val androidTag = "ReVanced Patcher"
-    }
-}

app/src/main/java/app/revanced/manager/patcher/patch/PatchBundle.kt

@@ -6,19 +6,18 @@ import app.revanced.patcher.PatchBundleLoader
 import app.revanced.patcher.patch.Patch
 import java.io.File
 
-class PatchBundle(private val loader: Iterable<Patch<*>>, val integrations: File?) {
-    constructor(bundleJar: File, integrations: File?) : this(
-        object : Iterable<Patch<*>> {
-            private fun load(): Iterable<Patch<*>> {
-                bundleJar.setReadOnly()
-                return PatchBundleLoader.Dex(bundleJar, optimizedDexDirectory = null)
-            }
+class PatchBundle(val patchesJar: File, val integrations: File?) {
+    private val loader = object : Iterable<Patch<*>> {
+        private fun load(): Iterable<Patch<*>> {
+            patchesJar.setReadOnly()
+            return PatchBundleLoader.Dex(patchesJar, optimizedDexDirectory = null)
+        }
 
-            override fun iterator(): Iterator<Patch<*>> = load().iterator()
-        },
-        integrations
-    ) {
-        Log.d(tag, "Loaded patch bundle: $bundleJar")
+        override fun iterator(): Iterator<Patch<*>> = load().iterator()
+    }
+
+    init {
+        Log.d(tag, "Loaded patch bundle: $patchesJar")
     }
 
     /**

app/src/main/java/app/revanced/manager/patcher/runtime/CoroutineRuntime.kt

@@ -0,0 +1,70 @@
+package app.revanced.manager.patcher.runtime
+
+import android.content.Context
+import app.revanced.manager.patcher.Session
+import app.revanced.manager.patcher.logger.Logger
+import app.revanced.manager.patcher.worker.ProgressEventHandler
+import app.revanced.manager.ui.model.State
+import app.revanced.manager.util.Options
+import app.revanced.manager.util.PatchSelection
+import java.io.File
+
+/**
+ * Simple [Runtime] implementation that runs the patcher using coroutines.
+ */
+class CoroutineRuntime(private val context: Context) : Runtime(context) {
+    override suspend fun execute(
+        inputFile: String,
+        outputFile: String,
+        packageName: String,
+        selectedPatches: PatchSelection,
+        options: Options,
+        logger: Logger,
+        onPatchCompleted: () -> Unit,
+        onProgress: ProgressEventHandler,
+    ) {
+        val bundles = bundles()
+
+        val selectedBundles = selectedPatches.keys
+        val allPatches = bundles.filterKeys { selectedBundles.contains(it) }
+            .mapValues { (_, bundle) -> bundle.patchClasses(packageName) }
+
+        val patchList = selectedPatches.flatMap { (bundle, selected) ->
+            allPatches[bundle]?.filter { selected.contains(it.name) }
+                ?: throw IllegalArgumentException("Patch bundle $bundle does not exist")
+        }
+
+        val integrations = bundles.mapNotNull { (_, bundle) -> bundle.integrations }
+
+        // Set all patch options.
+        options.forEach { (bundle, bundlePatchOptions) ->
+            val patches = allPatches[bundle] ?: return@forEach
+            bundlePatchOptions.forEach { (patchName, configuredPatchOptions) ->
+                val patchOptions = patches.single { it.name == patchName }.options
+                configuredPatchOptions.forEach { (key, value) ->
+                    patchOptions[key] = value
+                }
+            }
+        }
+
+        onProgress(null, State.COMPLETED, null) // Loading patches
+
+        Session(
+            cacheDir,
+            frameworkPath,
+            aaptPath,
+            enableMultithreadedDexWriter(),
+            context,
+            logger,
+            File(inputFile),
+            onPatchCompleted = onPatchCompleted,
+            onProgress
+        ).use { session ->
+            session.run(
+                File(outputFile),
+                patchList,
+                integrations
+            )
+        }
+    }
+}

app/src/main/java/app/revanced/manager/patcher/runtime/ProcessRuntime.kt

@@ -0,0 +1,188 @@
+package app.revanced.manager.patcher.runtime
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.util.Log
+import androidx.core.content.ContextCompat
+import app.revanced.manager.BuildConfig
+import app.revanced.manager.patcher.runtime.process.IPatcherEvents
+import app.revanced.manager.patcher.runtime.process.IPatcherProcess
+import app.revanced.manager.patcher.LibraryResolver
+import app.revanced.manager.patcher.logger.Logger
+import app.revanced.manager.patcher.runtime.process.Parameters
+import app.revanced.manager.patcher.runtime.process.PatchConfiguration
+import app.revanced.manager.patcher.runtime.process.PatcherProcess
+import app.revanced.manager.patcher.worker.ProgressEventHandler
+import app.revanced.manager.ui.model.State
+import app.revanced.manager.util.Options
+import app.revanced.manager.util.PM
+import app.revanced.manager.util.PatchSelection
+import app.revanced.manager.util.tag
+import com.github.pgreze.process.Redirect
+import com.github.pgreze.process.process
+import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withTimeout
+import org.koin.core.component.inject
+
+/**
+ * Runs the patcher in another process by using the app_process binary and IPC.
+ */
+class ProcessRuntime(private val context: Context) : Runtime(context) {
+    private val pm: PM by inject()
+
+    private suspend fun awaitBinderConnection(): IPatcherProcess {
+        val binderFuture = CompletableDeferred<IPatcherProcess>()
+        val receiver = object : BroadcastReceiver() {
+            override fun onReceive(context: Context, intent: Intent) {
+                val binder =
+                    intent.getBundleExtra(INTENT_BUNDLE_KEY)?.getBinder(BUNDLE_BINDER_KEY)!!
+
+                binderFuture.complete(IPatcherProcess.Stub.asInterface(binder))
+            }
+        }
+
+        ContextCompat.registerReceiver(context, receiver, IntentFilter().apply {
+            addAction(CONNECT_TO_APP_ACTION)
+        }, ContextCompat.RECEIVER_NOT_EXPORTED)
+
+        return try {
+            withTimeout(10000L) {
+                binderFuture.await()
+            }
+        } finally {
+            context.unregisterReceiver(receiver)
+        }
+    }
+
+    override suspend fun execute(
+        inputFile: String,
+        outputFile: String,
+        packageName: String,
+        selectedPatches: PatchSelection,
+        options: Options,
+        logger: Logger,
+        onPatchCompleted: () -> Unit,
+        onProgress: ProgressEventHandler,
+    ) = coroutineScope {
+        // Get the location of our own Apk.
+        val managerBaseApk = pm.getPackageInfo(context.packageName)!!.applicationInfo.sourceDir
+
+        val limit = "${prefs.patcherProcessMemoryLimit.get()}M"
+        val propOverride = resolvePropOverride(context)?.absolutePath
+            ?: throw Exception("Couldn't find prop override library")
+
+        val env =
+            System.getenv().toMutableMap().apply {
+                putAll(
+                    mapOf(
+                        "CLASSPATH" to managerBaseApk,
+                        // Override the props used by ART to set the memory limit.
+                        "LD_PRELOAD" to propOverride,
+                        "PROP_dalvik.vm.heapgrowthlimit" to limit,
+                        "PROP_dalvik.vm.heapsize" to limit,
+                    )
+                )
+            }
+
+        launch(Dispatchers.IO) {
+            val result = process(
+                APP_PROCESS_BIN_PATH,
+                "-Djava.io.tmpdir=$cacheDir", // The process will use /tmp if this isn't set, which is a problem because that folder is not accessible on Android.
+                "/", // The unused cmd-dir parameter
+                "--nice-name=${context.packageName}:Patcher",
+                PatcherProcess::class.java.name, // The class with the main function.
+                context.packageName,
+                env = env,
+                stdout = Redirect.CAPTURE,
+                stderr = Redirect.CAPTURE,
+            ) { line ->
+                // The process shouldn't generally be writing to stdio. Log any lines we get as warnings.
+                logger.warn("[STDIO]: $line")
+            }
+
+            Log.d(tag, "Process finished with exit code ${result.resultCode}")
+
+            if (result.resultCode != 0) throw Exception("Process exited with nonzero exit code ${result.resultCode}")
+        }
+
+        val patching = CompletableDeferred<Unit>()
+
+        launch(Dispatchers.IO) {
+            val binder = awaitBinderConnection()
+
+            // Android Studio's fast deployment feature causes an issue where the other process will be running older code compared to the main process.
+            // The patcher process is running outdated code if the randomly generated BUILD_ID numbers don't match.
+            // To fix it, clear the cache in the Android settings or disable fast deployment (Run configurations -> Edit Configurations -> app -> Enable "always deploy with package manager").
+            if (binder.buildId() != BuildConfig.BUILD_ID) throw Exception("app_process is running outdated code. Clear the app cache or disable disable Android 11 deployment optimizations in your IDE")
+
+            val eventHandler = object : IPatcherEvents.Stub() {
+                override fun log(level: String, msg: String) = logger.log(enumValueOf(level), msg)
+
+                override fun patchSucceeded() = onPatchCompleted()
+
+                override fun progress(name: String?, state: String?, msg: String?) =
+                    onProgress(name, state?.let { enumValueOf<State>(it) }, msg)
+
+                override fun finished(exceptionStackTrace: String?) {
+                    binder.exit()
+
+                    exceptionStackTrace?.let {
+                        patching.completeExceptionally(RemoteFailureException(it))
+                        return
+                    }
+                    patching.complete(Unit)
+                }
+            }
+
+            val bundles = bundles()
+
+            val parameters = Parameters(
+                aaptPath = aaptPath,
+                frameworkDir = frameworkPath,
+                cacheDir = cacheDir,
+                packageName = packageName,
+                inputFile = inputFile,
+                outputFile = outputFile,
+                enableMultithrededDexWriter = enableMultithreadedDexWriter(),
+                configurations = selectedPatches.map { (id, patches) ->
+                    val bundle = bundles[id]!!
+
+                    PatchConfiguration(
+                        bundle.patchesJar.absolutePath,
+                        bundle.integrations?.absolutePath,
+                        patches,
+                        options[id].orEmpty()
+                    )
+                }
+            )
+
+            binder.start(parameters, eventHandler)
+        }
+
+        // Wait until patching finishes.
+        patching.await()
+    }
+
+    companion object : LibraryResolver() {
+        private const val APP_PROCESS_BIN_PATH = "/system/bin/app_process"
+
+        const val CONNECT_TO_APP_ACTION = "CONNECT_TO_APP_ACTION"
+        const val INTENT_BUNDLE_KEY = "BUNDLE"
+        const val BUNDLE_BINDER_KEY = "BINDER"
+
+        private fun resolvePropOverride(context: Context) = findLibrary(context, "prop_override")
+    }
+
+    /**
+     * An [Exception] occured in the remote process while patching.
+     *
+     * @param originalStackTrace The stack trace of the original [Exception].
+     */
+    class RemoteFailureException(val originalStackTrace: String) : Exception()
+}
+

app/src/main/java/app/revanced/manager/patcher/runtime/Runtime.kt

@@ -0,0 +1,41 @@
+package app.revanced.manager.patcher.runtime
+
+import android.content.Context
+import app.revanced.manager.data.platform.Filesystem
+import app.revanced.manager.domain.manager.PreferencesManager
+import app.revanced.manager.domain.repository.PatchBundleRepository
+import app.revanced.manager.patcher.aapt.Aapt
+import app.revanced.manager.patcher.logger.Logger
+import app.revanced.manager.patcher.worker.ProgressEventHandler
+import app.revanced.manager.util.Options
+import app.revanced.manager.util.PatchSelection
+import kotlinx.coroutines.flow.first
+import org.koin.core.component.KoinComponent
+import org.koin.core.component.inject
+import java.io.FileNotFoundException
+
+sealed class Runtime(context: Context) : KoinComponent {
+    private val fs: Filesystem by inject()
+    private val patchBundlesRepo: PatchBundleRepository by inject()
+    protected val prefs: PreferencesManager by inject()
+
+    protected val cacheDir: String = fs.tempDir.absolutePath
+    protected val aaptPath = Aapt.binary(context)?.absolutePath
+        ?: throw FileNotFoundException("Could not resolve aapt.")
+    protected val frameworkPath: String =
+        context.cacheDir.resolve("framework").also { it.mkdirs() }.absolutePath
+
+    protected suspend fun bundles() = patchBundlesRepo.bundles.first()
+    protected suspend fun enableMultithreadedDexWriter() = prefs.multithreadingDexFileWriter.get()
+
+    abstract suspend fun execute(
+        inputFile: String,
+        outputFile: String,
+        packageName: String,
+        selectedPatches: PatchSelection,
+        options: Options,
+        logger: Logger,
+        onPatchCompleted: () -> Unit,
+        onProgress: ProgressEventHandler,
+    )
+}

app/src/main/java/app/revanced/manager/patcher/runtime/process/Parameters.kt

@@ -0,0 +1,25 @@
+package app.revanced.manager.patcher.runtime.process
+
+import android.os.Parcelable
+import kotlinx.parcelize.Parcelize
+import kotlinx.parcelize.RawValue
+
+@Parcelize
+data class Parameters(
+    val cacheDir: String,
+    val aaptPath: String,
+    val frameworkDir: String,
+    val packageName: String,
+    val inputFile: String,
+    val outputFile: String,
+    val enableMultithrededDexWriter: Boolean,
+    val configurations: List<PatchConfiguration>,
+) : Parcelable
+
+@Parcelize
+data class PatchConfiguration(
+    val bundlePath: String,
+    val integrationsPath: String?,
+    val patches: Set<String>,
+    val options: @RawValue Map<String, Map<String, Any?>>
+) : Parcelable

app/src/main/java/app/revanced/manager/patcher/runtime/process/PatcherProcess.kt

@@ -0,0 +1,126 @@
+package app.revanced.manager.patcher.runtime.process
+
+import android.app.ActivityThread
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.os.Looper
+import app.revanced.manager.BuildConfig
+import app.revanced.manager.patcher.Session
+import app.revanced.manager.patcher.logger.LogLevel
+import app.revanced.manager.patcher.logger.Logger
+import app.revanced.manager.patcher.patch.PatchBundle
+import app.revanced.manager.patcher.runtime.ProcessRuntime
+import app.revanced.manager.ui.model.State
+import kotlinx.coroutines.CoroutineExceptionHandler
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import java.io.File
+import kotlin.system.exitProcess
+
+/**
+ * The main class that runs inside the runner process launched by [ProcessRuntime].
+ */
+class PatcherProcess(private val context: Context) : IPatcherProcess.Stub() {
+    private var eventBinder: IPatcherEvents? = null
+
+    private val scope =
+        CoroutineScope(Dispatchers.Default + CoroutineExceptionHandler { _, throwable ->
+            // Try to send the exception information to the main app.
+            eventBinder?.let {
+                try {
+                    it.finished(throwable.stackTraceToString())
+                    return@CoroutineExceptionHandler
+                } catch (_: Exception) {
+                }
+            }
+
+            throwable.printStackTrace()
+            exitProcess(1)
+        })
+
+    override fun buildId() = BuildConfig.BUILD_ID
+    override fun exit() = exitProcess(0)
+
+    override fun start(parameters: Parameters, events: IPatcherEvents) {
+        eventBinder = events
+
+        scope.launch {
+            val logger = object : Logger() {
+                override fun log(level: LogLevel, message: String) =
+                    events.log(level.name, message)
+            }
+
+            logger.info("Memory limit: ${Runtime.getRuntime().maxMemory() / (1024 * 1024)}MB")
+
+            val integrations =
+                parameters.configurations.mapNotNull { it.integrationsPath?.let(::File) }
+            val patchList = parameters.configurations.flatMap { config ->
+                val bundle = PatchBundle(File(config.bundlePath), null)
+
+                val patches =
+                    bundle.patchClasses(parameters.packageName).filter { it.name in config.patches }
+                        .associateBy { it.name }
+
+                config.options.forEach { (patchName, opts) ->
+                    val patchOptions = patches[patchName]?.options
+                        ?: throw Exception("Patch with name $patchName does not exist.")
+
+                    opts.forEach { (key, value) ->
+                        patchOptions[key] = value
+                    }
+                }
+
+                patches.values
+            }
+
+            events.progress(null, State.COMPLETED.name, null) // Loading patches
+
+            Session(
+                cacheDir = parameters.cacheDir,
+                aaptPath = parameters.aaptPath,
+                frameworkDir = parameters.frameworkDir,
+                multithreadingDexFileWriter = parameters.enableMultithrededDexWriter,
+                androidContext = context,
+                logger = logger,
+                input = File(parameters.inputFile),
+                onPatchCompleted = { events.patchSucceeded() },
+                onProgress = { name, state, message ->
+                    events.progress(name, state?.name, message)
+                }
+            ).use {
+                it.run(File(parameters.outputFile), patchList, integrations)
+            }
+
+            events.finished(null)
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        fun main(args: Array<String>) {
+            Looper.prepare()
+
+            val managerPackageName = args[0]
+
+            // Abuse hidden APIs to get a context.
+            val systemContext = ActivityThread.systemMain().systemContext as Context
+            val appContext = systemContext.createPackageContext(managerPackageName, 0)
+
+            val ipcInterface = PatcherProcess(appContext)
+
+            appContext.sendBroadcast(Intent().apply {
+                action = ProcessRuntime.CONNECT_TO_APP_ACTION
+                `package` = managerPackageName
+
+                putExtra(ProcessRuntime.INTENT_BUNDLE_KEY, Bundle().apply {
+                    putBinder(ProcessRuntime.BUNDLE_BINDER_KEY, ipcInterface.asBinder())
+                })
+            })
+
+            Looper.loop()
+            exitProcess(1) // Shouldn't happen
+        }
+    }
+}

app/src/main/java/app/revanced/manager/patcher/worker/PatcherWorker.kt

@@ -23,12 +23,11 @@ import app.revanced.manager.domain.manager.KeystoreManager
 import app.revanced.manager.domain.manager.PreferencesManager
 import app.revanced.manager.domain.repository.DownloadedAppRepository
 import app.revanced.manager.domain.repository.InstalledAppRepository
-import app.revanced.manager.domain.repository.PatchBundleRepository
 import app.revanced.manager.domain.worker.Worker
 import app.revanced.manager.domain.worker.WorkerRepository
-import app.revanced.manager.patcher.Session
-import app.revanced.manager.patcher.aapt.Aapt
-import app.revanced.manager.patcher.logger.ManagerLogger
+import app.revanced.manager.patcher.logger.Logger
+import app.revanced.manager.patcher.runtime.CoroutineRuntime
+import app.revanced.manager.patcher.runtime.ProcessRuntime
 import app.revanced.manager.ui.model.SelectedApp
 import app.revanced.manager.ui.model.State
 import app.revanced.manager.util.Options
@@ -36,17 +35,17 @@ import app.revanced.manager.util.PM
 import app.revanced.manager.util.PatchSelection
 import app.revanced.manager.util.tag
 import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.update
 import org.koin.core.component.KoinComponent
 import org.koin.core.component.inject
 import java.io.File
-import java.io.FileNotFoundException
+
+typealias ProgressEventHandler = (name: String?, state: State?, message: String?) -> Unit
 
 class PatcherWorker(
     context: Context,
     parameters: WorkerParameters
 ) : Worker<PatcherWorker.Args>(context, parameters), KoinComponent {
-    private val patchBundleRepository: PatchBundleRepository by inject()
     private val workerRepository: WorkerRepository by inject()
     private val prefs: PreferencesManager by inject()
     private val keystoreManager: KeystoreManager by inject()
@@ -61,11 +60,11 @@ class PatcherWorker(
         val output: String,
         val selectedPatches: PatchSelection,
         val options: Options,
-        val logger: ManagerLogger,
+        val logger: Logger,
         val downloadProgress: MutableStateFlow<Pair<Float, Float>?>,
         val patchesProgress: MutableStateFlow<Pair<Int, Int>>,
         val setInputFile: (File) -> Unit,
-        val onProgress: (name: String?, state: State?, message: String?) -> Unit
+        val onProgress: ProgressEventHandler
     ) {
         val packageName get() = input.packageName
     }
@@ -111,7 +110,8 @@ class PatcherWorker(
 
         val wakeLock: PowerManager.WakeLock =
             (applicationContext.getSystemService(Context.POWER_SERVICE) as PowerManager)
-                .newWakeLock(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, "$tag::Patcher").apply {
+                .newWakeLock(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, "$tag::Patcher")
+                .apply {
                     acquire(10 * 60 * 1000L)
                     Log.d(tag, "Acquired wakelock.")
                 }
@@ -133,26 +133,6 @@ class PatcherWorker(
         val patchedApk = fs.tempDir.resolve("patched.apk")
 
         return try {
-            val bundles = patchBundleRepository.bundles.first()
-
-            // TODO: consider passing all the classes directly now that the input no longer needs to be serializable.
-            val selectedBundles = args.selectedPatches.keys
-            val allPatches = bundles.filterKeys { selectedBundles.contains(it) }
-                .mapValues { (_, bundle) -> bundle.patchClasses(args.packageName) }
-
-            val selectedPatches = args.selectedPatches.flatMap { (bundle, selected) ->
-                allPatches[bundle]?.filter { selected.contains(it.name) }
-                    ?: throw IllegalArgumentException("Patch bundle $bundle does not exist")
-            }
-
-            val aaptPath = Aapt.binary(applicationContext)?.absolutePath
-                ?: throw FileNotFoundException("Could not resolve aapt.")
-
-            val frameworkPath =
-                applicationContext.cacheDir.resolve("framework").also { it.mkdirs() }.absolutePath
-
-            val integrations = bundles.mapNotNull { (_, bundle) -> bundle.integrations }
-
             if (args.input is SelectedApp.Installed) {
                 installedAppRepository.get(args.packageName)?.let {
                     if (it.installType == InstallType.ROOT) {
@@ -161,19 +141,6 @@ class PatcherWorker(
                 }
             }
 
-            // Set all patch options.
-            args.options.forEach { (bundle, bundlePatchOptions) ->
-                val patches = allPatches[bundle] ?: return@forEach
-                bundlePatchOptions.forEach { (patchName, configuredPatchOptions) ->
-                    val patchOptions = patches.single { it.name == patchName }.options
-                    configuredPatchOptions.forEach { (key, value) ->
-                        patchOptions[key] = value
-                    }
-                }
-            }
-
-            updateProgress(state = State.COMPLETED) // Loading patches
-
             val inputFile = when (val selectedApp = args.input) {
                 is SelectedApp.Download -> {
                     downloadedAppRepository.download(
@@ -190,31 +157,38 @@ class PatcherWorker(
                 is SelectedApp.Installed -> File(pm.getPackageInfo(selectedApp.packageName)!!.applicationInfo.sourceDir)
             }
 
-            Session(
-                fs.tempDir.absolutePath,
-                frameworkPath,
-                aaptPath,
-                prefs.multithreadingDexFileWriter.get(),
-                applicationContext,
-                args.logger,
-                inputFile,
-                args.patchesProgress,
-                args.onProgress
-            ).use { session ->
-                session.run(
-                    patchedApk,
-                    selectedPatches,
-                    integrations
-                )
+            val runtime = if (prefs.useProcessRuntime.get()) {
+                ProcessRuntime(applicationContext)
+            } else {
+                CoroutineRuntime(applicationContext)
             }
 
+            runtime.execute(
+                inputFile.absolutePath,
+                patchedApk.absolutePath,
+                args.packageName,
+                args.selectedPatches,
+                args.options,
+                args.logger,
+                onPatchCompleted = {
+                    args.patchesProgress.update { (completed, total) ->
+                        completed + 1 to total
+                    }
+                },
+                args.onProgress
+            )
+
             keystoreManager.sign(patchedApk, File(args.output))
             updateProgress(state = State.COMPLETED) // Signing
 
             Log.i(tag, "Patching succeeded".logFmt())
             Result.success()
+        } catch (e: ProcessRuntime.RemoteFailureException) {
+            Log.e(tag, "An exception occured in the remote process while patching. ${e.originalStackTrace}".logFmt())
+            updateProgress(state = State.FAILED, message = e.originalStackTrace)
+            Result.failure()
         } catch (e: Exception) {
-            Log.e(tag, "Exception while patching".logFmt(), e)
+            Log.e(tag, "An exception occured while patching".logFmt(), e)
             updateProgress(state = State.FAILED, message = e.stackTraceToString())
             Result.failure()
         } finally {
@@ -223,7 +197,7 @@ class PatcherWorker(
     }
 
     companion object {
-        private const val logPrefix = "[Worker]:"
-        private fun String.logFmt() = "$logPrefix $this"
+        private const val LOG_PREFIX = "[Worker]"
+        private fun String.logFmt() = "$LOG_PREFIX $this"
     }
 }

app/src/main/java/app/revanced/manager/ui/component/bundle/BundleInformationDialog.kt

@@ -22,7 +22,6 @@ import androidx.compose.ui.window.DialogProperties
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import app.revanced.manager.R
 import app.revanced.manager.domain.bundles.LocalPatchBundle
-import app.revanced.manager.domain.bundles.RemotePatchBundle
 import app.revanced.manager.domain.bundles.PatchBundleSource
 import app.revanced.manager.domain.bundles.PatchBundleSource.Companion.asRemoteOrNull
 import app.revanced.manager.domain.bundles.PatchBundleSource.Companion.isDefault

app/src/main/java/app/revanced/manager/ui/component/patches/OptionFields.kt

@@ -85,7 +85,7 @@ private fun StringOptionDialog(
                 value = fieldValue,
                 onValueChange = { fieldValue = it },
                 placeholder = {
-                    Text(stringResource(R.string.string_option_placeholder))
+                    Text(stringResource(R.string.dialog_input_placeholder))
                 },
                 trailingIcon = {
                     var showDropdownMenu by rememberSaveable { mutableStateOf(false) }
@@ -184,7 +184,7 @@ private val optionImplementations = mapOf<String, OptionImpl>(
             IconButton(onClick = ::showInputDialog) {
                 Icon(
                     Icons.Outlined.Edit,
-                    contentDescription = stringResource(R.string.string_option_icon_description)
+                    contentDescription = stringResource(R.string.edit)
                 )
             }
         }

app/src/main/java/app/revanced/manager/ui/component/settings/IntegerItem.kt

@@ -0,0 +1,121 @@
+package app.revanced.manager.ui.component.settings
+
+import androidx.annotation.StringRes
+import androidx.compose.foundation.clickable
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.Edit
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import app.revanced.manager.R
+import app.revanced.manager.domain.manager.base.Preference
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+
+@Composable
+fun IntegerItem(
+    modifier: Modifier = Modifier,
+    preference: Preference<Int>,
+    coroutineScope: CoroutineScope = rememberCoroutineScope(),
+    @StringRes headline: Int,
+    @StringRes description: Int
+) {
+    val value by preference.getAsState()
+
+    IntegerItem(
+        modifier = modifier,
+        value = value,
+        onValueChange = { coroutineScope.launch { preference.update(it) } },
+        headline = headline,
+        description = description
+    )
+}
+
+@Composable
+fun IntegerItem(
+    modifier: Modifier = Modifier,
+    value: Int,
+    onValueChange: (Int) -> Unit,
+    @StringRes headline: Int,
+    @StringRes description: Int
+) {
+    var dialogOpen by rememberSaveable {
+        mutableStateOf(false)
+    }
+
+    if (dialogOpen) {
+        IntegerItemDialog(current = value, name = headline) { new ->
+            dialogOpen = false
+            new?.let(onValueChange)
+        }
+    }
+
+    SettingsListItem(
+        modifier = Modifier
+            .clickable { dialogOpen = true }
+            .then(modifier),
+        headlineContent = stringResource(headline),
+        supportingContent = stringResource(description),
+        trailingContent = {
+            IconButton(onClick = { dialogOpen = true }) {
+                Icon(
+                    Icons.Outlined.Edit,
+                    contentDescription = stringResource(R.string.edit)
+                )
+            }
+        }
+    )
+}
+
+@Composable
+private fun IntegerItemDialog(current: Int, @StringRes name: Int, onSubmit: (Int?) -> Unit) {
+    var fieldValue by rememberSaveable {
+        mutableStateOf(current.toString())
+    }
+
+    val integerFieldValue by remember {
+        derivedStateOf {
+            fieldValue.toIntOrNull()
+        }
+    }
+
+    AlertDialog(
+        onDismissRequest = { onSubmit(null) },
+        title = { Text(stringResource(name)) },
+        text = {
+            OutlinedTextField(
+                value = fieldValue,
+                onValueChange = { fieldValue = it },
+                placeholder = {
+                    Text(stringResource(R.string.dialog_input_placeholder))
+                },
+            )
+        },
+        confirmButton = {
+            TextButton(
+                onClick = { integerFieldValue?.let(onSubmit) },
+                enabled = integerFieldValue != null,
+            ) {
+                Text(stringResource(R.string.save))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = { onSubmit(null) }) {
+                Text(stringResource(R.string.cancel))
+            }
+        },
+    )
+}

app/src/main/java/app/revanced/manager/ui/screen/PatcherScreen.kt

@@ -73,11 +73,13 @@ fun PatcherScreen(
 
     val progress by remember {
         derivedStateOf {
+            val (patchesCompleted, patchesTotal) = patchesProgress
+
             val current = vm.steps.count {
                 it.state == State.COMPLETED && it.category != StepCategory.PATCHING
-            } + patchesProgress.first
+            } + patchesCompleted
 
-            val total = vm.steps.size - 1 + patchesProgress.second
+            val total = vm.steps.size - 1 + patchesTotal
 
             current.toFloat() / total.toFloat()
         }

app/src/main/java/app/revanced/manager/ui/screen/settings/AdvancedSettingsScreen.kt

@@ -35,6 +35,7 @@ import app.revanced.manager.ui.component.AppTopBar
 import app.revanced.manager.ui.component.ColumnWithScrollbar
 import app.revanced.manager.ui.component.GroupHeader
 import app.revanced.manager.ui.component.settings.BooleanItem
+import app.revanced.manager.ui.component.settings.IntegerItem
 import app.revanced.manager.ui.component.settings.SettingsListItem
 import app.revanced.manager.ui.viewmodel.AdvancedSettingsViewModel
 import org.koin.androidx.compose.getViewModel
@@ -86,6 +87,18 @@ fun AdvancedSettingsScreen(
             )
 
             GroupHeader(stringResource(R.string.patcher))
+            BooleanItem(
+                preference = vm.prefs.useProcessRuntime,
+                coroutineScope = vm.viewModelScope,
+                headline = R.string.process_runtime,
+                description = R.string.process_runtime_description,
+            )
+            IntegerItem(
+                preference = vm.prefs.patcherProcessMemoryLimit,
+                coroutineScope = vm.viewModelScope,
+                headline = R.string.process_runtime_memory_limit,
+                description = R.string.process_runtime_memory_limit_description,
+            )
             BooleanItem(
                 preference = vm.prefs.disablePatchVersionCompatCheck,
                 coroutineScope = vm.viewModelScope,

app/src/main/java/app/revanced/manager/ui/viewmodel/PatcherViewModel.kt

@@ -26,7 +26,8 @@ import app.revanced.manager.data.room.apps.installed.InstalledApp
 import app.revanced.manager.domain.installer.RootInstaller
 import app.revanced.manager.domain.repository.InstalledAppRepository
 import app.revanced.manager.domain.worker.WorkerRepository
-import app.revanced.manager.patcher.logger.ManagerLogger
+import app.revanced.manager.patcher.logger.LogLevel
+import app.revanced.manager.patcher.logger.Logger
 import app.revanced.manager.patcher.worker.PatcherWorker
 import app.revanced.manager.service.InstallService
 import app.revanced.manager.ui.destination.Destination
@@ -74,8 +75,17 @@ class PatcherViewModel(
     private var inputFile: File? = null
     private val outputFile = tempDir.resolve("output.apk")
 
-    private val workManager = WorkManager.getInstance(app)
-    private val logger = ManagerLogger()
+    private val logs = mutableListOf<Pair<LogLevel, String>>()
+    private val logger = object : Logger() {
+        override fun log(level: LogLevel, message: String) {
+            level.androidLog(message)
+            if (level == LogLevel.TRACE) return
+
+            viewModelScope.launch {
+                logs.add(level to message)
+            }
+        }
+    }
 
     val patchesProgress = MutableStateFlow(Pair(0, input.selectedPatches.values.sumOf { it.size }))
     private val downloadProgress = MutableStateFlow<Pair<Float, Float>?>(null)
@@ -86,6 +96,8 @@ class PatcherViewModel(
     ).toMutableStateList()
     private var currentStepIndex = 0
 
+    private val workManager = WorkManager.getInstance(app)
+
     private val patcherWorkerId: UUID =
         workerRepository.launchExpedited<PatcherWorker, PatcherWorker.Args>(
             "patching", PatcherWorker.Args(
@@ -98,18 +110,21 @@ class PatcherViewModel(
                 patchesProgress,
                 setInputFile = { inputFile = it },
                 onProgress = { name, state, message ->
-                    steps[currentStepIndex] = steps[currentStepIndex].run {
-                        copy(
-                            name = name ?: this.name,
-                            state = state ?: this.state,
-                            message = message ?: this.message
-                        )
-                    }
+                    viewModelScope.launch {
+                        steps[currentStepIndex] = steps[currentStepIndex].run {
+                            copy(
+                                name = name ?: this.name,
+                                state = state ?: this.state,
+                                message = message ?: this.message
+                            )
+                        }
 
-                    if (state == State.COMPLETED && currentStepIndex != steps.lastIndex) {
-                        currentStepIndex++
+                        if (state == State.COMPLETED && currentStepIndex != steps.lastIndex) {
+                            currentStepIndex++
 
-                        steps[currentStepIndex] = steps[currentStepIndex].copy(state = State.RUNNING)
+                            steps[currentStepIndex] =
+                                steps[currentStepIndex].copy(state = State.RUNNING)
+                        }
                     }
                 }
             )
@@ -204,7 +219,10 @@ class PatcherViewModel(
     fun exportLogs(context: Context) {
         val sendIntent: Intent = Intent().apply {
             action = Intent.ACTION_SEND
-            putExtra(Intent.EXTRA_TEXT, logger.export())
+            putExtra(
+                Intent.EXTRA_TEXT,
+                logs.asSequence().map { (level, msg) -> "[${level.name}]: $msg" }.joinToString("\n")
+            )
             type = "text/plain"
         }
 
@@ -255,7 +273,8 @@ class PatcherViewModel(
                         app.toast(app.getString(R.string.install_app_fail, e.simpleMessage()))
                         try {
                             rootInstaller.uninstall(packageName)
-                        } catch (_: Exception) {  }
+                        } catch (_: Exception) {
+                        }
                     }
                 }
             }
@@ -265,22 +284,34 @@ class PatcherViewModel(
     }
 
     companion object {
+        private const val TAG = "ReVanced Patcher"
+
+        fun LogLevel.androidLog(msg: String) = when (this) {
+            LogLevel.TRACE -> Log.v(TAG, msg)
+            LogLevel.INFO -> Log.i(TAG, msg)
+            LogLevel.WARN -> Log.w(TAG, msg)
+            LogLevel.ERROR -> Log.e(TAG, msg)
+        }
+
         fun generateSteps(
             context: Context,
             selectedApp: SelectedApp,
             downloadProgress: StateFlow<Pair<Float, Float>?>? = null
         ): List<Step> {
+            val needsDownload = selectedApp is SelectedApp.Download
+
             return listOfNotNull(
-                Step(
-                    context.getString(R.string.patcher_step_load_patches),
-                    StepCategory.PREPARING,
-                    state = State.RUNNING
-                ),
                 Step(
                     context.getString(R.string.download_apk),
                     StepCategory.PREPARING,
-                    downloadProgress = downloadProgress
-                ).takeIf { selectedApp is SelectedApp.Download },
+                    state = State.RUNNING,
+                    downloadProgress = downloadProgress,
+                ).takeIf { needsDownload },
+                Step(
+                    context.getString(R.string.patcher_step_load_patches),
+                    StepCategory.PREPARING,
+                    state = if (needsDownload) State.WAITING else State.RUNNING,
+                ),
                 Step(
                     context.getString(R.string.patcher_step_unpack),
                     StepCategory.PREPARING

app/src/main/res/values/strings.xml

@@ -111,6 +111,8 @@
 
     <string name="options">Options</string>
     <string name="ok">OK</string>
+    <string name="edit">Edit</string>
+    <string name="dialog_input_placeholder">Value</string>
     <string name="reset">Reset</string>
     <string name="patch">Patch</string>
     <string name="select_from_storage">Select from storage</string>
@@ -129,6 +131,10 @@
     <string name="dark">Dark</string>
     <string name="appearance">Appearance</string>
     <string name="downloaded_apps">Downloaded apps</string>
+    <string name="process_runtime">Run Patcher in another process (experimental)</string>
+    <string name="process_runtime_description">This is faster and allows Patcher to use more memory.</string>
+    <string name="process_runtime_memory_limit">Patcher process memory limit</string>
+    <string name="process_runtime_memory_limit_description">The max amount of memory that the Patcher process can use (in megabytes)</string>
     <string name="api_url">API URL</string>
     <string name="api_url_dialog_title">Set custom API URL</string>
     <string name="api_url_dialog_description">You may have issues with features when using a custom API URL.</string>
@@ -218,9 +224,7 @@
     <string name="patch_selector_sheet_filter_title">Filter</string>
     <string name="patch_selector_sheet_filter_compat_title">Compatibility</string>
 
-    <string name="string_option_icon_description">Edit</string>
     <string name="string_option_menu_description">More options</string>
-    <string name="string_option_placeholder">Value</string>
 
     <string name="path_selector">Select from storage</string>
     <string name="path_selector_parent_dir">Previous directory</string>

gradle/libs.versions.toml

@@ -31,6 +31,8 @@ skrapeit = "1.2.2"
 libsu = "5.2.1"
 scrollbars = "1.0.4"
 compose-icons = "1.2.4"
+kotlin-process = "1.4.1"
+hidden-api-stub = "4.3.3"
 
 [libraries]
 # AndroidX Core
@@ -102,6 +104,12 @@ markdown-renderer = { group = "com.mikepenz", name = "multiplatform-markdown-ren
 # Fading Edges
 fading-edges = { group = "com.github.GIGAMOLE", name = "ComposeFadingEdges", version.ref = "fading-edges"}
 
+# Native processes
+kotlin-process = { group = "com.github.pgreze", name = "kotlin-process", version.ref = "kotlin-process" }
+
+# HiddenAPI
+hidden-api-stub = { group = "dev.rikka.hidden", name = "stub", version.ref = "hidden-api-stub" }
+
 # LibSU
 libsu-core = { group = "com.github.topjohnwu.libsu", name = "core", version.ref = "libsu" }
 libsu-service = { group = "com.github.topjohnwu.libsu", name = "service", version.ref = "libsu" }