Merge "Splits without restart" into nyc-dev
diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index 2415ce1..1bc33b8 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -1788,7 +1788,8 @@
     }
 
     /**
-     * Creates the top level resources for the given package.
+     * Creates the top level resources for the given package. Will return an existing
+     * Resources if one has already been created.
      */
     Resources getTopLevelResources(String resDir, String[] splitResDirs, String[] overlayDirs,
             String[] libDirs, int displayId, Configuration overrideConfiguration,
@@ -1798,6 +1799,19 @@
                 pkgInfo.getClassLoader());
     }
 
+    /**
+     * Creates a new top level resources for the given package. Will always create a new
+     * Resources, regardless if one has already been created.
+     */
+    Resources getNewTopLevelResources(String resDir, String[] splitResDirs, String[] overlayDirs,
+            String[] libDirs, int displayId, Configuration overrideConfiguration,
+            LoadedApk pkgInfo) {
+        mResourcesManager.removeTopLevelResources(
+                resDir, displayId, overrideConfiguration, pkgInfo.getCompatibilityInfo());
+        return getTopLevelResources(resDir, splitResDirs, overlayDirs, libDirs,
+                displayId, overrideConfiguration, pkgInfo);
+    }
+
     final Handler getHandler() {
         return mH;
     }
@@ -4749,29 +4763,87 @@
 
     final void handleDispatchPackageBroadcast(int cmd, String[] packages) {
         boolean hasPkgInfo = false;
-        if (packages != null) {
-            synchronized (mResourcesManager) {
-                for (int i=packages.length-1; i>=0; i--) {
-                    //Slog.i(TAG, "Cleaning old package: " + packages[i]);
-                    if (!hasPkgInfo) {
-                        WeakReference<LoadedApk> ref;
-                        ref = mPackages.get(packages[i]);
-                        if (ref != null && ref.get() != null) {
+        switch (cmd) {
+            case IApplicationThread.PACKAGE_REMOVED:
+            case IApplicationThread.PACKAGE_REMOVED_DONT_KILL:
+            {
+                final boolean killApp = cmd == IApplicationThread.PACKAGE_REMOVED;
+                if (packages == null) {
+                    break;
+                }
+                synchronized (mResourcesManager) {
+                    for (int i = packages.length - 1; i >= 0; i--) {
+                        if (!hasPkgInfo) {
+                            WeakReference<LoadedApk> ref = mPackages.get(packages[i]);
+                            if (ref != null && ref.get() != null) {
+                                hasPkgInfo = true;
+                            } else {
+                                ref = mResourcePackages.get(packages[i]);
+                                if (ref != null && ref.get() != null) {
+                                    hasPkgInfo = true;
+                                }
+                            }
+                        }
+                        if (killApp) {
+                            mPackages.remove(packages[i]);
+                            mResourcePackages.remove(packages[i]);
+                        }
+                    }
+                }
+                break;
+            }
+            case IApplicationThread.PACKAGE_REPLACED:
+            {
+                if (packages == null) {
+                    break;
+                }
+                synchronized (mResourcesManager) {
+                    for (int i = packages.length - 1; i >= 0; i--) {
+                        WeakReference<LoadedApk> ref = mPackages.get(packages[i]);
+                        LoadedApk pkgInfo = ref != null ? ref.get() : null;
+                        if (pkgInfo != null) {
                             hasPkgInfo = true;
                         } else {
                             ref = mResourcePackages.get(packages[i]);
-                            if (ref != null && ref.get() != null) {
+                            pkgInfo = ref != null ? ref.get() : null;
+                            if (pkgInfo != null) {
                                 hasPkgInfo = true;
                             }
                         }
+                        // If the package is being replaced, yet it still has a valid
+                        // LoadedApk object, the package was updated with _DONT_KILL.
+                        // Adjust it's internal references to the application info and
+                        // resources.
+                        if (pkgInfo != null) {
+                            try {
+                                final String packageName = packages[i];
+                                final ApplicationInfo aInfo =
+                                        sPackageManager.getApplicationInfo(
+                                                packageName,
+                                                0 /*flags*/,
+                                                UserHandle.myUserId());
+
+                                if (mActivities.size() > 0) {
+                                    for (ActivityClientRecord ar : mActivities.values()) {
+                                        if (ar.activityInfo.applicationInfo.packageName
+                                                .equals(packageName)) {
+                                            ar.activityInfo.applicationInfo = aInfo;
+                                            ar.packageInfo = pkgInfo;
+                                        }
+                                    }
+                                }
+                                final List<String> oldPaths =
+                                        sPackageManager.getPreviousCodePaths(packageName);
+                                pkgInfo.updateApplicationInfo(aInfo, oldPaths);
+                            } catch (RemoteException e) {
+                            }
+                        }
                     }
-                    mPackages.remove(packages[i]);
-                    mResourcePackages.remove(packages[i]);
                 }
+                break;
             }
         }
-        ApplicationPackageManager.handlePackageBroadcast(cmd, packages,
-                hasPkgInfo);
+        ApplicationPackageManager.handlePackageBroadcast(cmd, packages, hasPkgInfo);
     }
 
     final void handleLowMemory() {
diff --git a/core/java/android/app/ApplicationLoaders.java b/core/java/android/app/ApplicationLoaders.java
index b20c091..0fc097e 100644
--- a/core/java/android/app/ApplicationLoaders.java
+++ b/core/java/android/app/ApplicationLoaders.java
@@ -86,6 +86,18 @@
                                                             String libraryPermittedPath,
                                                             boolean isShared);
 
+    /**
+     * Adds a new path the classpath of the given loader.
+     * @throws IllegalStateException if the provided class loader is not a {@link PathClassLoader}.
+     */
+    void addPath(ClassLoader classLoader, String dexPath) {
+        if (!(classLoader instanceof PathClassLoader)) {
+            throw new IllegalStateException("class loader is not a PathClassLoader");
+        }
+        final PathClassLoader baseDexClassLoader = (PathClassLoader) classLoader;
+        baseDexClassLoader.addDexPath(dexPath);
+    }
+
     private final ArrayMap<String, ClassLoader> mLoaders = new ArrayMap<String, ClassLoader>();
 
     private static final ApplicationLoaders gApplicationLoaders
diff --git a/core/java/android/app/IApplicationThread.java b/core/java/android/app/IApplicationThread.java
index a3c9591..628bde0 100644
--- a/core/java/android/app/IApplicationThread.java
+++ b/core/java/android/app/IApplicationThread.java
@@ -123,8 +123,13 @@
     void dumpHeap(boolean managed, String path, ParcelFileDescriptor fd)
             throws RemoteException;
     void setSchedulingGroup(int group) throws RemoteException;
+    // the package has been removed, clean up internal references
     static final int PACKAGE_REMOVED = 0;
     static final int EXTERNAL_STORAGE_UNAVAILABLE = 1;
+    // the package is being modified in-place, don't kill it and retain references to it
+    static final int PACKAGE_REMOVED_DONT_KILL = 2;
+    // a previously removed package was replaced with a new version [eg. upgrade, split added, ...]
+    static final int PACKAGE_REPLACED = 3;
     void dispatchPackageBroadcast(int cmd, String[] packages) throws RemoteException;
     void scheduleCrash(String msg) throws RemoteException;
     void dumpActivity(FileDescriptor fd, IBinder servicetoken, String prefix, String[] args)
diff --git a/core/java/android/app/LoadedApk.java b/core/java/android/app/LoadedApk.java
index b65faa9..cd17078 100644
--- a/core/java/android/app/LoadedApk.java
+++ b/core/java/android/app/LoadedApk.java
@@ -58,6 +58,7 @@
 import java.net.URL;
 import java.util.List;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.Objects;
@@ -83,24 +84,25 @@
     private static final String TAG = "LoadedApk";
 
     private final ActivityThread mActivityThread;
-    private ApplicationInfo mApplicationInfo;
     final String mPackageName;
-    private final String mAppDir;
-    private final String mResDir;
-    private final String[] mSplitAppDirs;
-    private final String[] mSplitResDirs;
-    private final String[] mOverlayDirs;
-    private final String[] mSharedLibraries;
-    private final String mDataDir;
-    private final String mLibDir;
-    private final File mDataDirFile;
-    private final File mDeviceEncryptedDataDirFile;
-    private final File mCredentialEncryptedDataDirFile;
+    private ApplicationInfo mApplicationInfo;
+    private String mAppDir;
+    private String mResDir;
+    private String[] mSplitAppDirs;
+    private String[] mSplitResDirs;
+    private String[] mOverlayDirs;
+    private String[] mSharedLibraries;
+    private String mDataDir;
+    private String mLibDir;
+    private File mDataDirFile;
+    private File mDeviceEncryptedDataDirFile;
+    private File mCredentialEncryptedDataDirFile;
     private final ClassLoader mBaseClassLoader;
     private final boolean mSecurityViolation;
     private final boolean mIncludeCode;
     private final boolean mRegisterPackage;
     private final DisplayAdjustments mDisplayAdjustments = new DisplayAdjustments();
+    /** WARNING: This may change. Don't hold external references to it. */
     Resources mResources;
     private ClassLoader mClassLoader;
     private Application mApplication;
@@ -129,23 +131,10 @@
     public LoadedApk(ActivityThread activityThread, ApplicationInfo aInfo,
             CompatibilityInfo compatInfo, ClassLoader baseLoader,
             boolean securityViolation, boolean includeCode, boolean registerPackage) {
-        final int myUid = Process.myUid();
-        aInfo = adjustNativeLibraryPaths(aInfo);
 
         mActivityThread = activityThread;
-        mApplicationInfo = aInfo;
+        setApplicationInfo(aInfo);
         mPackageName = aInfo.packageName;
-        mAppDir = aInfo.sourceDir;
-        mResDir = aInfo.uid == myUid ? aInfo.sourceDir : aInfo.publicSourceDir;
-        mSplitAppDirs = aInfo.splitSourceDirs;
-        mSplitResDirs = aInfo.uid == myUid ? aInfo.splitSourceDirs : aInfo.splitPublicSourceDirs;
-        mOverlayDirs = aInfo.resourceDirs;
-        mSharedLibraries = aInfo.sharedLibraryFiles;
-        mDataDir = aInfo.dataDir;
-        mDataDirFile = FileUtils.newFileOrNull(mDataDir);
-        mDeviceEncryptedDataDirFile = FileUtils.newFileOrNull(aInfo.deviceEncryptedDataDir);
-        mCredentialEncryptedDataDirFile = FileUtils.newFileOrNull(aInfo.credentialEncryptedDataDir);
-        mLibDir = aInfo.nativeLibraryDir;
         mBaseClassLoader = baseLoader;
         mSecurityViolation = securityViolation;
         mIncludeCode = includeCode;
@@ -266,26 +255,165 @@
         return ai.sharedLibraryFiles;
     }
 
-    public ClassLoader getClassLoader() {
-        synchronized (this) {
-            if (mClassLoader != null) {
-                return mClassLoader;
-            }
+    public void updateApplicationInfo(ApplicationInfo aInfo, List<String> oldPaths) {
+        setApplicationInfo(aInfo);
 
-            if (mPackageName.equals("android")) {
-                if (mBaseClassLoader == null) {
-                    mClassLoader = ClassLoader.getSystemClassLoader();
-                } else {
-                    mClassLoader = mBaseClassLoader;
+        final List<String> newPaths = new ArrayList<>();
+        makePaths(mActivityThread, aInfo, newPaths, null /*libPaths*/);
+        final List<String> addedPaths = new ArrayList<>(newPaths.size());
+
+        if (oldPaths != null) {
+            for (String path : newPaths) {
+                final String apkName = path.substring(path.lastIndexOf(File.separator));
+                boolean match = false;
+                for (String oldPath : oldPaths) {
+                    final String oldApkName = oldPath.substring(path.lastIndexOf(File.separator));
+                    if (apkName.equals(oldApkName)) {
+                        match = true;
+                        break;
+                    }
                 }
-                return mClassLoader;
+                if (!match) {
+                    addedPaths.add(path);
+                }
+            }
+        } else {
+            addedPaths.addAll(newPaths);
+        }
+        synchronized (this) {
+            mClassLoader = createOrUpdateClassLoaderLocked(addedPaths);
+            if (mResources != null) {
+                mResources = mActivityThread.getNewTopLevelResources(mResDir, mSplitResDirs,
+                        mOverlayDirs, mApplicationInfo.sharedLibraryFiles, Display.DEFAULT_DISPLAY,
+                        null /*overrideConfiguration*/, this);
+            }
+        }
+    }
+
+    private void setApplicationInfo(ApplicationInfo aInfo) {
+        final int myUid = Process.myUid();
+        aInfo = adjustNativeLibraryPaths(aInfo);
+        mApplicationInfo = aInfo;
+        mAppDir = aInfo.sourceDir;
+        mResDir = aInfo.uid == myUid ? aInfo.sourceDir : aInfo.publicSourceDir;
+        mSplitAppDirs = aInfo.splitSourceDirs;
+        mSplitResDirs = aInfo.uid == myUid ? aInfo.splitSourceDirs : aInfo.splitPublicSourceDirs;
+        mOverlayDirs = aInfo.resourceDirs;
+        mSharedLibraries = aInfo.sharedLibraryFiles;
+        mDataDir = aInfo.dataDir;
+        mLibDir = aInfo.nativeLibraryDir;
+        mDataDirFile = FileUtils.newFileOrNull(aInfo.dataDir);
+        mDeviceEncryptedDataDirFile = FileUtils.newFileOrNull(aInfo.deviceEncryptedDataDir);
+        mCredentialEncryptedDataDirFile = FileUtils.newFileOrNull(aInfo.credentialEncryptedDataDir);
+    }
+
+    public static void makePaths(ActivityThread activityThread, ApplicationInfo aInfo,
+            List<String> outZipPaths, List<String> outLibPaths) {
+        final String appDir = aInfo.sourceDir;
+        final String[] splitAppDirs = aInfo.splitSourceDirs;
+        final String libDir = aInfo.nativeLibraryDir;
+        final String[] sharedLibraries = aInfo.sharedLibraryFiles;
+
+        outZipPaths.clear();
+        outZipPaths.add(appDir);
+        if (splitAppDirs != null) {
+            Collections.addAll(outZipPaths, splitAppDirs);
+        }
+
+        if (outLibPaths != null) {
+            outLibPaths.clear();
+        }
+
+        /*
+         * The following is a bit of a hack to inject
+         * instrumentation into the system: If the app
+         * being started matches one of the instrumentation names,
+         * then we combine both the "instrumentation" and
+         * "instrumented" app into the path, along with the
+         * concatenation of both apps' shared library lists.
+         */
+
+        String instrumentationPackageName = activityThread.mInstrumentationPackageName;
+        String instrumentationAppDir = activityThread.mInstrumentationAppDir;
+        String[] instrumentationSplitAppDirs = activityThread.mInstrumentationSplitAppDirs;
+        String instrumentationLibDir = activityThread.mInstrumentationLibDir;
+
+        String instrumentedAppDir = activityThread.mInstrumentedAppDir;
+        String[] instrumentedSplitAppDirs = activityThread.mInstrumentedSplitAppDirs;
+        String instrumentedLibDir = activityThread.mInstrumentedLibDir;
+        String[] instrumentationLibs = null;
+
+        if (appDir.equals(instrumentationAppDir)
+                || appDir.equals(instrumentedAppDir)) {
+            outZipPaths.clear();
+            outZipPaths.add(instrumentationAppDir);
+            if (instrumentationSplitAppDirs != null) {
+                Collections.addAll(outZipPaths, instrumentationSplitAppDirs);
+            }
+            outZipPaths.add(instrumentedAppDir);
+            if (instrumentedSplitAppDirs != null) {
+                Collections.addAll(outZipPaths, instrumentedSplitAppDirs);
             }
 
+            if (outLibPaths != null) {
+                outLibPaths.add(instrumentationLibDir);
+                outLibPaths.add(instrumentedLibDir);
+            }
+
+            if (!instrumentedAppDir.equals(instrumentationAppDir)) {
+                instrumentationLibs = getLibrariesFor(instrumentationPackageName);
+            }
+        }
+
+        if (outLibPaths != null) {
+            if (outLibPaths.isEmpty()) {
+                outLibPaths.add(libDir);
+            }
+
+            // Add path to libraries in apk for current abi. Do this now because more entries
+            // will be added to zipPaths that shouldn't be part of the library path.
+            if (aInfo.primaryCpuAbi != null) {
+                for (String apk : outZipPaths) {
+                    outLibPaths.add(apk + "!/lib/" + aInfo.primaryCpuAbi);
+                }
+            }
+
+            if (aInfo.isSystemApp() && !aInfo.isUpdatedSystemApp()) {
+                // Add path to system libraries to libPaths;
+                // Access to system libs should be limited
+                // to bundled applications; this is why updated
+                // system apps are not included.
+                outLibPaths.add(System.getProperty("java.library.path"));
+            }
+        }
+
+        if (sharedLibraries != null) {
+            for (String lib : sharedLibraries) {
+                if (!outZipPaths.contains(lib)) {
+                    outZipPaths.add(0, lib);
+                }
+            }
+        }
+
+        if (instrumentationLibs != null) {
+            for (String lib : instrumentationLibs) {
+                if (!outZipPaths.contains(lib)) {
+                    outZipPaths.add(0, lib);
+                }
+            }
+        }
+
+        final String zip = TextUtils.join(File.pathSeparator, outZipPaths);
+    }
+
+    private ClassLoader createOrUpdateClassLoaderLocked(List<String> addedPaths) {
+        final ClassLoader classLoader;
+        if (mIncludeCode && !mPackageName.equals("android")) {
             // Avoid the binder call when the package is the current application package.
             // The activity manager will perform ensure that dexopt is performed before
             // spinning up the process.
             if (!Objects.equals(mPackageName, ActivityThread.currentPackageName())) {
-                final String isa = VMRuntime.getRuntime().vmInstructionSet();
+                VMRuntime.getRuntime().vmInstructionSet();
                 try {
                     ActivityThread.getPackageManager().notifyPackageUse(mPackageName);
                 } catch (RemoteException re) {
@@ -294,7 +422,6 @@
             }
 
             final List<String> zipPaths = new ArrayList<>();
-            final List<String> apkPaths = new ArrayList<>();
             final List<String> libPaths = new ArrayList<>();
 
             if (mRegisterPackage) {
@@ -305,91 +432,12 @@
                 }
             }
 
-            zipPaths.add(mAppDir);
-            if (mSplitAppDirs != null) {
-                Collections.addAll(zipPaths, mSplitAppDirs);
-            }
-
-            libPaths.add(mLibDir);
-
-            /*
-             * The following is a bit of a hack to inject
-             * instrumentation into the system: If the app
-             * being started matches one of the instrumentation names,
-             * then we combine both the "instrumentation" and
-             * "instrumented" app into the path, along with the
-             * concatenation of both apps' shared library lists.
-             */
-
-            String instrumentationPackageName = mActivityThread.mInstrumentationPackageName;
-            String instrumentationAppDir = mActivityThread.mInstrumentationAppDir;
-            String[] instrumentationSplitAppDirs = mActivityThread.mInstrumentationSplitAppDirs;
-            String instrumentationLibDir = mActivityThread.mInstrumentationLibDir;
-
-            String instrumentedAppDir = mActivityThread.mInstrumentedAppDir;
-            String[] instrumentedSplitAppDirs = mActivityThread.mInstrumentedSplitAppDirs;
-            String instrumentedLibDir = mActivityThread.mInstrumentedLibDir;
-            String[] instrumentationLibs = null;
-
-            if (mAppDir.equals(instrumentationAppDir)
-                    || mAppDir.equals(instrumentedAppDir)) {
-                zipPaths.clear();
-                zipPaths.add(instrumentationAppDir);
-                if (instrumentationSplitAppDirs != null) {
-                    Collections.addAll(zipPaths, instrumentationSplitAppDirs);
-                }
-                zipPaths.add(instrumentedAppDir);
-                if (instrumentedSplitAppDirs != null) {
-                    Collections.addAll(zipPaths, instrumentedSplitAppDirs);
-                }
-
-                libPaths.clear();
-                libPaths.add(instrumentationLibDir);
-                libPaths.add(instrumentedLibDir);
-
-                if (!instrumentedAppDir.equals(instrumentationAppDir)) {
-                    instrumentationLibs = getLibrariesFor(instrumentationPackageName);
-                }
-            }
-
-            apkPaths.addAll(zipPaths);
-
-            if (mSharedLibraries != null) {
-                for (String lib : mSharedLibraries) {
-                    if (!zipPaths.contains(lib)) {
-                        zipPaths.add(0, lib);
-                    }
-                }
-            }
-
-            if (instrumentationLibs != null) {
-                for (String lib : instrumentationLibs) {
-                    if (!zipPaths.contains(lib)) {
-                        zipPaths.add(0, lib);
-                    }
-                }
-            }
-
-            final String zip = mIncludeCode ? TextUtils.join(File.pathSeparator, zipPaths) : "";
-
-            // Add path to libraries in apk for current abi
-            if (mApplicationInfo.primaryCpuAbi != null) {
-                for (String apk : apkPaths) {
-                  libPaths.add(apk + "!/lib/" + mApplicationInfo.primaryCpuAbi);
-                }
-            }
-
+            makePaths(mActivityThread, mApplicationInfo, zipPaths, libPaths);
+            final String zip = TextUtils.join(File.pathSeparator, zipPaths);
+            final boolean isBundledApp = mApplicationInfo.isSystemApp()
+                    && !mApplicationInfo.isUpdatedSystemApp();
             String libraryPermittedPath = mDataDir;
-            boolean isBundledApp = false;
-
-            if (mApplicationInfo.isSystemApp() && !mApplicationInfo.isUpdatedSystemApp()) {
-                isBundledApp = true;
-                // Add path to system libraries to libPaths;
-                // Access to system libs should be limited
-                // to bundled applications; this is why updated
-                // system apps are not included.
-                libPaths.add(System.getProperty("java.library.path"));
-
+            if (isBundledApp) {
                 // This is necessary to grant bundled apps access to
                 // libraries located in subdirectories of /system/lib
                 libraryPermittedPath += File.pathSeparator +
@@ -414,15 +462,42 @@
                 Slog.v(ActivityThread.TAG, "Class path: " + zip +
                         ", JNI path: " + librarySearchPath);
 
-            // Temporarily disable logging of disk reads on the Looper thread
-            // as this is early and necessary.
-            StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
+            if (mClassLoader == null) {
+                // Temporarily disable logging of disk reads on the Looper thread
+                // as this is early and necessary.
+                StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
 
-            mClassLoader = ApplicationLoaders.getDefault().getClassLoader(zip,
-                    mApplicationInfo.targetSdkVersion, isBundledApp, librarySearchPath,
-                    libraryPermittedPath, mBaseClassLoader);
+                classLoader = ApplicationLoaders.getDefault().getClassLoader(zip,
+                        mApplicationInfo.targetSdkVersion, isBundledApp, librarySearchPath,
+                        libraryPermittedPath, mBaseClassLoader);
 
-            StrictMode.setThreadPolicy(oldPolicy);
+                StrictMode.setThreadPolicy(oldPolicy);
+            } else if (addedPaths != null && addedPaths.size() > 0) {
+                final String add = TextUtils.join(File.pathSeparator, addedPaths);
+                ApplicationLoaders.getDefault().addPath(mClassLoader, add);
+                classLoader = mClassLoader;
+            } else {
+                classLoader = mClassLoader;
+            }
+        } else {
+            if (mClassLoader == null) {
+                if (mBaseClassLoader == null) {
+                    classLoader = ClassLoader.getSystemClassLoader();
+                } else {
+                    classLoader = mBaseClassLoader;
+                }
+            } else {
+                classLoader = mClassLoader;
+            }
+        }
+        return classLoader;
+    }
+
+    public ClassLoader getClassLoader() {
+        synchronized (this) {
+            if (mClassLoader == null) {
+                mClassLoader = createOrUpdateClassLoaderLocked(null /*addedPaths*/);
+            }
             return mClassLoader;
         }
     }
@@ -1103,7 +1178,6 @@
 
         private RuntimeException mUnbindLocation;
 
-        private boolean mDied;
         private boolean mForgotten;
 
         private static class ConnectionInfo {
@@ -1202,7 +1276,6 @@
             ServiceDispatcher.ConnectionInfo old;
 
             synchronized (this) {
-                mDied = true;
                 old = mActiveConnections.remove(name);
                 if (old == null || old.binder != service) {
                     // Death for someone different than who we last
@@ -1237,7 +1310,6 @@
 
                 if (service != null) {
                     // A new service is being connected... set it all up.
-                    mDied = false;
                     info = new ConnectionInfo();
                     info.binder = service;
                     info.deathMonitor = new DeathMonitor(name, service);
diff --git a/core/java/android/app/ResourcesManager.java b/core/java/android/app/ResourcesManager.java
index 94e584e..a6612f6 100644
--- a/core/java/android/app/ResourcesManager.java
+++ b/core/java/android/app/ResourcesManager.java
@@ -288,6 +288,19 @@
         }
     }
 
+    /**
+     * Removes the top level Resources for applications with the given compatibility info.
+     * @see #getTopLevelResources(String, String[], String[], String[], int, Configuration, CompatibilityInfo, ClassLoader)
+     */
+    void removeTopLevelResources(String resDir, int displayId, Configuration overrideConfiguration,
+            CompatibilityInfo compatInfo) {
+        final float scale = compatInfo.applicationScale;
+        final Configuration overrideConfigCopy = (overrideConfiguration != null)
+                ? new Configuration(overrideConfiguration) : null;
+        final ResourcesKey key = new ResourcesKey(resDir, displayId, overrideConfigCopy, scale);
+        mActiveResources.remove(key);
+    }
+
     /* package */ void setDefaultLocalesLocked(LocaleList locales) {
         final int bestLocale;
         if (mHasNonSystemLocales) {
diff --git a/core/java/android/content/pm/IPackageManager.aidl b/core/java/android/content/pm/IPackageManager.aidl
index 9959f27..0389085 100644
--- a/core/java/android/content/pm/IPackageManager.aidl
+++ b/core/java/android/content/pm/IPackageManager.aidl
@@ -530,4 +530,7 @@
     String getServicesSystemSharedLibraryPackageName();
 
     boolean isPackageDeviceAdminOnAnyUser(String packageName);
+
+    List<String> getPreviousCodePaths(in String packageName);
+
 }
diff --git a/core/java/android/content/pm/PackageInstaller.java b/core/java/android/content/pm/PackageInstaller.java
index 2cbb782..700a40d 100644
--- a/core/java/android/content/pm/PackageInstaller.java
+++ b/core/java/android/content/pm/PackageInstaller.java
@@ -1042,6 +1042,11 @@
         }
 
         /** {@hide} */
+        public void setInstallFlagsDontKillApp() {
+            installFlags |= PackageManager.INSTALL_DONT_KILL_APP;
+        }
+
+        /** {@hide} */
         public void dump(IndentingPrintWriter pw) {
             pw.printPair("mode", mode);
             pw.printHexPair("installFlags", installFlags);
diff --git a/core/java/android/content/pm/PackageManager.java b/core/java/android/content/pm/PackageManager.java
index 27056a3..c1a559e 100644
--- a/core/java/android/content/pm/PackageManager.java
+++ b/core/java/android/content/pm/PackageManager.java
@@ -538,6 +538,7 @@
             INSTALL_FORCE_VOLUME_UUID,
             INSTALL_FORCE_PERMISSION_PROMPT,
             INSTALL_EPHEMERAL,
+            INSTALL_DONT_KILL_APP,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface InstallFlags {}
@@ -640,6 +641,15 @@
     public static final int INSTALL_EPHEMERAL = 0x00000800;
 
     /**
+     * Flag parameter for {@link #installPackage} to indicate that this package contains
+     * a feature split to an existing application and the existing application should not
+     * be killed during the installation process.
+     *
+     * @hide
+     */
+    public static final int INSTALL_DONT_KILL_APP = 0x00001000;
+
+    /**
      * Flag parameter for
      * {@link #setComponentEnabledSetting(android.content.ComponentName, int, int)} to indicate
      * that you don't want to kill the app containing the component.  Be careful when you set this
@@ -1088,6 +1098,7 @@
             DELETE_KEEP_DATA,
             DELETE_ALL_USERS,
             DELETE_SYSTEM_APP,
+            DELETE_DONT_KILL_APP,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface DeleteFlags {}
@@ -1120,6 +1131,15 @@
     public static final int DELETE_SYSTEM_APP = 0x00000004;
 
     /**
+     * Flag parameter for {@link #deletePackage} to indicate that, if you are calling
+     * uninstall on a package that is replaced to provide new feature splits, the
+     * existing application should not be killed during the removal process.
+     *
+     * @hide
+     */
+    public static final int DELETE_DONT_KILL_APP = 0x00000008;
+
+    /**
      * Return code for when package deletion succeeds. This is passed to the
      * {@link IPackageDeleteObserver} if the system succeeded in deleting the
      * package.
diff --git a/core/java/android/content/pm/PackageManagerInternal.java b/core/java/android/content/pm/PackageManagerInternal.java
index 7fe7f84..89f2fc4 100644
--- a/core/java/android/content/pm/PackageManagerInternal.java
+++ b/core/java/android/content/pm/PackageManagerInternal.java
@@ -16,6 +16,8 @@
 
 package android.content.pm;
 
+import android.content.pm.PackageManager.NameNotFoundException;
+
 import java.util.List;
 
 /**
@@ -125,4 +127,17 @@
      * @return True a permissions review is required.
      */
     public abstract boolean isPermissionsReviewRequired(String packageName, int userId);
+
+    /**
+     * Gets all of the information we know about a particular package.
+     *
+     * @param packageName The package name to find.
+     * @param userId The user under which to check.
+     *
+     * @return An {@link ApplicationInfo} containing information about the
+     *         package.
+     * @throws NameNotFoundException if a package with the given name cannot be
+     *             found on the system.
+     */
+    public abstract ApplicationInfo getApplicationInfo(String packageName, int userId);
 }
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index b6b4606..3330a82 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -17226,10 +17226,11 @@
                             String ssp;
                             if (data != null && (ssp=data.getSchemeSpecificPart()) != null) {
                                 boolean removed = Intent.ACTION_PACKAGE_REMOVED.equals(action);
-                                boolean fullUninstall = removed &&
-                                        !intent.getBooleanExtra(Intent.EXTRA_REPLACING, false);
+                                final boolean replacing =
+                                        intent.getBooleanExtra(Intent.EXTRA_REPLACING, false);
                                 final boolean killProcess =
                                         !intent.getBooleanExtra(Intent.EXTRA_DONT_KILL_APP, false);
+                                final boolean fullUninstall = removed && !replacing;
                                 if (killProcess) {
                                     forceStopPackageLocked(ssp, UserHandle.getAppId(
                                             intent.getIntExtra(Intent.EXTRA_UID, -1)),
@@ -17237,7 +17238,10 @@
                                             removed ? "pkg removed" : "pkg changed");
                                 }
                                 if (removed) {
-                                    sendPackageBroadcastLocked(IApplicationThread.PACKAGE_REMOVED,
+                                    final int cmd = killProcess
+                                            ? IApplicationThread.PACKAGE_REMOVED
+                                            : IApplicationThread.PACKAGE_REMOVED_DONT_KILL;
+                                    sendPackageBroadcastLocked(cmd,
                                             new String[] {ssp}, userId);
                                     if (fullUninstall) {
                                         mAppOpsService.packageRemoved(
@@ -17272,7 +17276,23 @@
                             break;
                     }
                     break;
+                case Intent.ACTION_PACKAGE_REPLACED:
+                {
+                    final Uri data = intent.getData();
+                    final String ssp;
+                    if (data != null && (ssp = data.getSchemeSpecificPart()) != null) {
+                        final ApplicationInfo aInfo =
+                                getPackageManagerInternalLocked().getApplicationInfo(
+                                        ssp,
+                                        userId);
+                        mStackSupervisor.updateActivityApplicationInfoLocked(aInfo);
+                        sendPackageBroadcastLocked(IApplicationThread.PACKAGE_REPLACED,
+                                new String[] {ssp}, userId);
+                    }
+                    break;
+                }
                 case Intent.ACTION_PACKAGE_ADDED:
+                {
                     // Special case for adding a package: by default turn on compatibility mode.
                     Uri data = intent.getData();
                     String ssp;
@@ -17290,6 +17310,7 @@
                         }
                     }
                     break;
+                }
                 case Intent.ACTION_TIMEZONE_CHANGED:
                     // If this is the time zone changed action, queue up a message that will reset
                     // the timezone of all currently running processes. This message will get
diff --git a/services/core/java/com/android/server/am/ActivityRecord.java b/services/core/java/com/android/server/am/ActivityRecord.java
index d5e40cf..e430dad 100755
--- a/services/core/java/com/android/server/am/ActivityRecord.java
+++ b/services/core/java/com/android/server/am/ActivityRecord.java
@@ -76,6 +76,7 @@
 import java.io.PrintWriter;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Objects;
 
@@ -252,6 +253,10 @@
                 pw.print(prefix); pw.print("resDir="); pw.println(appInfo.publicSourceDir);
             }
             pw.print(prefix); pw.print("dataDir="); pw.println(appInfo.dataDir);
+            if (appInfo.splitSourceDirs != null) {
+                pw.print(prefix); pw.print("splitDir=");
+                        pw.println(Arrays.toString(appInfo.splitSourceDirs));
+            }
         }
         pw.print(prefix); pw.print("stateNotNeeded="); pw.print(stateNotNeeded);
                 pw.print(" componentSpecified="); pw.print(componentSpecified);
diff --git a/services/core/java/com/android/server/am/ActivityStack.java b/services/core/java/com/android/server/am/ActivityStack.java
index 769bee4..74c8363 100644
--- a/services/core/java/com/android/server/am/ActivityStack.java
+++ b/services/core/java/com/android/server/am/ActivityStack.java
@@ -65,6 +65,8 @@
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
 import android.content.res.Configuration;
 import android.graphics.Bitmap;
 import android.net.Uri;
@@ -184,7 +186,7 @@
      * The back history of all previous (and possibly still
      * running) activities.  It contains #TaskRecord objects.
      */
-    private ArrayList<TaskRecord> mTaskHistory = new ArrayList<>();
+    private final ArrayList<TaskRecord> mTaskHistory = new ArrayList<>();
 
     /**
      * Used for validating app tokens with window manager.
@@ -839,6 +841,18 @@
         }
     }
 
+    void updateActivityApplicationInfoLocked(ApplicationInfo aInfo) {
+        final String packageName = aInfo.packageName;
+        for (int taskNdx = mTaskHistory.size() - 1; taskNdx >= 0; --taskNdx) {
+            final List<ActivityRecord> activities = mTaskHistory.get(taskNdx).mActivities;
+            for (int activityNdx = activities.size() - 1; activityNdx >= 0; --activityNdx) {
+                if (packageName.equals(activities.get(activityNdx).packageName)) {
+                    activities.get(activityNdx).info.applicationInfo = aInfo;
+                }
+            }
+        }
+    }
+
     /**
      * @return true if something must be done before going to sleep.
      */
diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index f4f3c81..48f31f9 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -1700,6 +1700,15 @@
         return false;
     }
 
+    void updateActivityApplicationInfoLocked(ApplicationInfo aInfo) {
+        for (int displayNdx = mActivityDisplays.size() - 1; displayNdx >= 0; --displayNdx) {
+            final ArrayList<ActivityStack> stacks = mActivityDisplays.valueAt(displayNdx).mStacks;
+            for (int stackNdx = stacks.size() - 1; stackNdx >= 0; --stackNdx) {
+                stacks.get(stackNdx).updateActivityApplicationInfoLocked(aInfo);
+            }
+        }
+    }
+
     TaskRecord finishTopRunningActivityLocked(ProcessRecord app, String reason) {
         TaskRecord finishedTask = null;
         ActivityStack focusedStack = getFocusedStack();
diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index 86f2f97..31311f7 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -360,6 +360,7 @@
     static final int SCAN_MOVE = 1<<13;
     static final int SCAN_INITIAL = 1<<14;
     static final int SCAN_CHECK_ONLY = 1<<15;
+    static final int SCAN_DONT_KILL_APP = 1<<17;
 
     static final int REMOVE_CHATTY = 1<<16;
 
@@ -499,6 +500,9 @@
     final ArrayMap<String, PackageParser.Package> mPackages =
             new ArrayMap<String, PackageParser.Package>();
 
+    final ArrayMap<String, Set<String>> mKnownCodebase =
+            new ArrayMap<String, Set<String>>();
+
     // Tracks available target package names -> overlay package paths.
     final ArrayMap<String, ArrayMap<String, PackageParser.Package>> mOverlays =
         new ArrayMap<String, ArrayMap<String, PackageParser.Package>>();
@@ -1425,19 +1429,21 @@
 
                         final boolean grantPermissions = (args.installFlags
                                 & PackageManager.INSTALL_GRANT_RUNTIME_PERMISSIONS) != 0;
+                        final boolean killApp = (args.installFlags
+                                & PackageManager.INSTALL_DONT_KILL_APP) == 0;
                         final String[] grantedPermissions = args.installGrantPermissions;
 
                         // Handle the parent package
-                        handlePackagePostInstall(parentRes, grantPermissions, grantedPermissions,
-                                args.observer);
+                        handlePackagePostInstall(parentRes, grantPermissions, killApp,
+                                grantedPermissions, args.observer);
 
                         // Handle the child packages
                         final int childCount = (parentRes.addedChildPackages != null)
                                 ? parentRes.addedChildPackages.size() : 0;
                         for (int i = 0; i < childCount; i++) {
                             PackageInstalledInfo childRes = parentRes.addedChildPackages.valueAt(i);
-                            handlePackagePostInstall(childRes, grantPermissions, grantedPermissions,
-                                    args.observer);
+                            handlePackagePostInstall(childRes, grantPermissions, killApp,
+                                    grantedPermissions, args.observer);
                         }
 
                         // Log tracing if needed
@@ -1632,11 +1638,12 @@
     }
 
     private void handlePackagePostInstall(PackageInstalledInfo res, boolean grantPermissions,
-            String[] grantedPermissions, IPackageInstallObserver2 installObserver) {
+            boolean killApp, String[] grantedPermissions,
+            IPackageInstallObserver2 installObserver) {
         if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {
             // Send the removed broadcasts
             if (res.removedInfo != null) {
-                res.removedInfo.sendPackageRemovedBroadcasts();
+                res.removedInfo.sendPackageRemovedBroadcasts(killApp);
             }
 
             // Now that we successfully installed the package, grant runtime
@@ -7899,13 +7906,17 @@
         // Request the ActivityManager to kill the process(only for existing packages)
         // so that we do not end up in a confused state while the user is still using the older
         // version of the application while the new one gets installed.
-        if ((scanFlags & SCAN_REPLACING) != 0) {
-            Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "killApplication");
+        final boolean isReplacing = (scanFlags & SCAN_REPLACING) != 0;
+        final boolean killApp = (scanFlags & SCAN_DONT_KILL_APP) == 0;
+        if (killApp) {
+            if (isReplacing) {
+                Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "killApplication");
 
-            killApplication(pkg.applicationInfo.packageName,
-                        pkg.applicationInfo.uid, "replace pkg");
+                killApplication(pkg.applicationInfo.packageName,
+                            pkg.applicationInfo.uid, "replace pkg");
 
-            Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
+                Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
+            }
         }
 
         // Also need to kill any apps that are dependent on the library.
@@ -10594,7 +10605,7 @@
         info.removedPackage = packageName;
         info.removedUsers = new int[] {userId};
         info.uid = UserHandle.getUid(userId, pkgSetting.appId);
-        info.sendPackageRemovedBroadcasts();
+        info.sendPackageRemovedBroadcasts(true /*killApp*/);
     }
 
     private void sendPackagesSuspendedForUser(String[] pkgList, int userId, boolean suspended) {
@@ -13077,6 +13088,15 @@
         }
     }
 
+    public List<String> getPreviousCodePaths(String packageName) {
+        final PackageSetting ps = mSettings.mPackages.get(packageName);
+        final List<String> result = new ArrayList<String>();
+        if (ps != null && ps.oldCodePaths != null) {
+            result.addAll(ps.oldCodePaths);
+        }
+        return result;
+    }
+
     private void replaceNonSystemPackageLI(PackageParser.Package deletedPackage,
             PackageParser.Package pkg, int parseFlags, int scanFlags, UserHandle user,
             int[] allUsers, String installerPackageName, PackageInstalledInfo res) {
@@ -13086,12 +13106,16 @@
         String pkgName = deletedPackage.packageName;
         boolean deletedPkg = true;
         boolean addedPkg = false;
+        boolean updatedSettings = false;
+        final boolean killApp = (scanFlags & SCAN_DONT_KILL_APP) == 0;
+        final int deleteFlags = PackageManager.DELETE_KEEP_DATA
+                | (killApp ? 0 : PackageManager.DELETE_DONT_KILL_APP);
 
         final long origUpdateTime = (pkg.mExtras != null)
                 ? ((PackageSetting)pkg.mExtras).lastUpdateTime : 0;
 
         // First delete the existing package while retaining the data directory
-        if (!deletePackageLI(pkgName, null, true, allUsers, PackageManager.DELETE_KEEP_DATA,
+        if (!deletePackageLI(pkgName, null, true, allUsers, deleteFlags,
                 res.removedInfo, true, pkg)) {
             // If the existing package wasn't successfully deleted
             res.setError(INSTALL_FAILED_REPLACE_COULDNT_DELETE, "replaceNonSystemPackageLI");
@@ -13117,6 +13141,27 @@
                 final PackageParser.Package newPackage = scanPackageTracedLI(pkg, parseFlags,
                         scanFlags | SCAN_UPDATE_TIME, System.currentTimeMillis(), user);
                 updateSettingsLI(newPackage, installerPackageName, allUsers, res, user);
+
+                // Update the in-memory copy of the previous code paths.
+                PackageSetting ps = mSettings.mPackages.get(pkgName);
+                if (!killApp) {
+                    if (ps.oldCodePaths == null) {
+                        ps.oldCodePaths = new ArraySet<>();
+                    }
+                    Collections.addAll(ps.oldCodePaths, deletedPackage.baseCodePath);
+                    if (deletedPackage.splitCodePaths != null) {
+                        Collections.addAll(ps.oldCodePaths, deletedPackage.splitCodePaths);
+                    }
+                } else {
+                    ps.oldCodePaths = null;
+                }
+                if (ps.childPackageNames != null) {
+                    for (int i = ps.childPackageNames.size() - 1; i >= 0; --i) {
+                        final String childPkgName = ps.childPackageNames.get(i);
+                        final PackageSetting childPs = mSettings.mPackages.get(childPkgName);
+                        childPs.oldCodePaths = ps.oldCodePaths;
+                    }
+                }
                 prepareAppDataAfterInstall(newPackage);
                 addedPkg = true;
             } catch (PackageManagerException e) {
@@ -13129,7 +13174,7 @@
 
             // Revert all internal state mutations and added folders for the failed install
             if (addedPkg) {
-                deletePackageLI(pkgName, null, true, allUsers, PackageManager.DELETE_KEEP_DATA,
+                deletePackageLI(pkgName, null, true, allUsers, deleteFlags,
                         res.removedInfo, true, null);
             }
 
@@ -13582,6 +13627,9 @@
             // moving a complete application; perform an initial scan on the new install location
             scanFlags |= SCAN_INITIAL;
         }
+        if ((installFlags & PackageManager.INSTALL_DONT_KILL_APP) != 0) {
+            scanFlags |= SCAN_DONT_KILL_APP;
+        }
 
         // Result object to be returned
         res.setReturnCode(PackageManager.INSTALL_SUCCEEDED);
@@ -14302,7 +14350,8 @@
         }
 
         if (res) {
-            info.sendPackageRemovedBroadcasts();
+            final boolean killApp = (flags & PackageManager.INSTALL_DONT_KILL_APP) == 0;
+            info.sendPackageRemovedBroadcasts(killApp);
             info.sendSystemPackageUpdatedBroadcasts();
             info.sendSystemPackageAppearedBroadcasts();
         }
@@ -14334,12 +14383,12 @@
         ArrayMap<String, PackageRemovedInfo> removedChildPackages;
         ArrayMap<String, PackageInstalledInfo> appearedChildPackages;
 
-        void sendPackageRemovedBroadcasts() {
-            sendPackageRemovedBroadcastInternal();
+        void sendPackageRemovedBroadcasts(boolean killApp) {
+            sendPackageRemovedBroadcastInternal(killApp);
             final int childCount = removedChildPackages != null ? removedChildPackages.size() : 0;
             for (int i = 0; i < childCount; i++) {
                 PackageRemovedInfo childInfo = removedChildPackages.valueAt(i);
-                childInfo.sendPackageRemovedBroadcastInternal();
+                childInfo.sendPackageRemovedBroadcastInternal(killApp);
             }
         }
 
@@ -14381,10 +14430,11 @@
                     null, 0, removedPackage, null, null);
         }
 
-        private void sendPackageRemovedBroadcastInternal() {
+        private void sendPackageRemovedBroadcastInternal(boolean killApp) {
             Bundle extras = new Bundle(2);
             extras.putInt(Intent.EXTRA_UID, removedAppId >= 0  ? removedAppId : uid);
             extras.putBoolean(Intent.EXTRA_DATA_REMOVED, dataRemoved);
+            extras.putBoolean(Intent.EXTRA_DONT_KILL_APP, !killApp);
             if (isUpdate || isRemovedPackageSystemUpdate) {
                 extras.putBoolean(Intent.EXTRA_REPLACING, true);
             }
@@ -14875,7 +14925,10 @@
         } else {
             if (DEBUG_REMOVE) Slog.d(TAG, "Removing non-system package: " + ps.name);
             // Kill application pre-emptively especially for apps on sd.
-            killApplication(packageName, ps.appId, "uninstall pkg");
+            final boolean killApp = (flags & PackageManager.DELETE_DONT_KILL_APP) == 0;
+            if (killApp) {
+                killApplication(packageName, ps.appId, "uninstall pkg");
+            }
             ret = deleteInstalledPackageLI(ps, deleteCodeAndResources, flags, allUserHandles,
                     outInfo, writeSettings, replacingPackage);
         }
@@ -19124,6 +19177,11 @@
                 return permissionsState.isPermissionReviewRequired(userId);
             }
         }
+
+        @Override
+        public ApplicationInfo getApplicationInfo(String packageName, int userId) {
+            return PackageManagerService.this.getApplicationInfo(packageName, 0 /*flags*/, userId);
+        }
     }
 
     @Override
diff --git a/services/core/java/com/android/server/pm/PackageSettingBase.java b/services/core/java/com/android/server/pm/PackageSettingBase.java
index e5eec7e..1434718 100644
--- a/services/core/java/com/android/server/pm/PackageSettingBase.java
+++ b/services/core/java/com/android/server/pm/PackageSettingBase.java
@@ -30,6 +30,7 @@
 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 
 /**
  * Settings base class for pending and resolved classes.
@@ -118,7 +119,14 @@
      * platform will refuse to launch packages in a frozen state.
      */
     boolean frozen = false;
-
+    /**
+     * Non-persisted value. During an "upgrade without restart", we need the set
+     * of all previous code paths so we can surgically add the new APKs to the
+     * active classloader. If at any point an application is upgraded with a
+     * restart, this field will be cleared since the classloader would be created
+     * using the full set of code paths when the package's process is started.
+     */
+    Set<String> oldCodePaths;
     PackageSettingBase origPackage;
 
     /** Package name of the app that installed this package */