Upstream: Renderers are running in WebAPKs.

content/public/android/java/src/org/chromium/content/app/ChildProcessService.java

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.app;
 
 import android.app.Service;
-import android.content.Context;
 import android.content.Intent;
-import android.graphics.SurfaceTexture;
 import android.os.Bundle;
 import android.os.IBinder;
-import android.os.Parcelable;
-import android.os.Process;
-import android.os.RemoteException;
-import android.view.Surface;
 
-import org.chromium.base.BaseSwitches;
-import org.chromium.base.CommandLine;
-import org.chromium.base.ContextUtils;
-import org.chromium.base.Log;
-import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.SuppressFBWarnings;
-import org.chromium.base.library_loader.LibraryLoader;
-import org.chromium.base.library_loader.Linker;
-import org.chromium.base.library_loader.ProcessInitException;
-import org.chromium.content.browser.ChildProcessConstants;
-import org.chromium.content.browser.ChildProcessCreationParams;
 import org.chromium.content.browser.ChildProcessLauncher;
-import org.chromium.content.browser.FileDescriptorInfo;
-import org.chromium.content.common.ContentSwitches;
-import org.chromium.content.common.IChildProcessCallback;
-import org.chromium.content.common.IChildProcessService;
-import org.chromium.content.common.SurfaceWrapper;
-
-import java.util.concurrent.Semaphore;
-import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * This is the base class for child services; the [Non]SandboxedProcessService0, 1.. etc
  * subclasses provide the concrete service entry points, to enable the browser to connect
  * to more than one distinct process (i.e. one process per service number, up to limit of N).
  * The embedding application must declare these service instances in the application section
  * of its AndroidManifest.xml, for example with N entries of the form:-
  *     <service android:name="org.chromium.content.app.[Non]SandboxedProcessServiceX"
  *              android:process=":[non]sandboxed_processX" />
  * for X in 0...N-1 (where N is {@link ChildProcessLauncher#MAX_REGISTERED_SERVICES})
  */
 @JNINamespace("content")

[pkotwicz, 2016/06/10 21:29:47]

Is the JNINamespace annotation needed?

[Xi Han, 2016/06/13 20:04:11]

We have to keep the namespace, since all of its subclass has, and Chrome crashes
after removing the namespace. I don't think it is worthy to do some other
changes just for removing a namespace here.

 @SuppressWarnings("SynchronizeOnNonFinalField")

[pkotwicz, 2016/06/10 21:29:47]

Is this annotation needed?

[Xi Han, 2016/06/13 20:04:11]

Removed.

 public class ChildProcessService extends Service {
-    private static final String MAIN_THREAD_NAME = "ChildProcessMain";
     private static final String TAG = "ChildProcessService";

[pkotwicz, 2016/06/10 21:29:47]

Nit: Remove TAG because it is unused

[Xi Han, 2016/06/13 20:04:11]

Done.

-    protected static final FileDescriptorInfo[] EMPTY_FILE_DESCRIPTOR_INFO = {};
-    private IChildProcessCallback mCallback;
 
-    // This is the native "Main" thread for the renderer / utility process.
-    private Thread mMainThread;
-    // Parameters received via IPC, only accessed while holding the mMainThread monitor.
-    private String[] mCommandLineParams;
-    private int mCpuCount;
-    private long mCpuFeatures;
-    // File descriptors that should be registered natively.
-    private FileDescriptorInfo[] mFdInfos;
-    // Linker-specific parameters for this child process service.
-    private ChromiumLinkerParams mLinkerParams;
-    // Child library process type.
-    private int mLibraryProcessType;
-
-    private static AtomicReference<Context> sContext = new AtomicReference<Context>(null);
-    private boolean mLibraryInitialized = false;
-    // Becomes true once the service is bound. Access must synchronize around mMainThread.
-    private boolean mIsBound = false;
-
-    private final Semaphore mActivitySemaphore = new Semaphore(1);
-
-    // Return a Linker instance. If testing, the Linker needs special setup.
-    private Linker getLinker() {
-        if (Linker.areTestsEnabled()) {
-            // For testing, set the Linker implementation and the test runner
-            // class name to match those used by the parent.
-            assert mLinkerParams != null;
-            Linker.setupForTesting(
-                    mLinkerParams.mLinkerImplementationForTesting,
-                    mLinkerParams.mTestRunnerClassNameForTesting);
-        }
-        return Linker.getInstance();
-    }
-
-    // Binder object used by clients for this service.
-    private final IChildProcessService.Stub mBinder = new IChildProcessService.Stub() {
-        // NOTE: Implement any IChildProcessService methods here.
-        @Override
-        public int setupConnection(Bundle args, IChildProcessCallback callback) {
-            mCallback = callback;
-            getServiceInfo(args);
-            return Process.myPid();
-        }
-
-        @Override
-        public void crashIntentionallyForTesting() {
-            Process.killProcess(Process.myPid());
-        }
-    };
-
-    /* package */ static Context getContext() {
-        return sContext.get();
-    }
+    private final ChildProcessServiceImpl mChildProcessServiceImpl =
+            new ChildProcessServiceImpl();
 
     @Override
     public void onCreate() {
-        Log.i(TAG, "Creating new ChildProcessService pid=%d", Process.myPid());
-        if (sContext.get() != null) {
-            throw new RuntimeException("Illegal child process reuse.");
-        }
-        sContext.set(this);
         super.onCreate();
-
-        ContextUtils.initApplicationContext(getApplicationContext());
-
-        mMainThread = new Thread(new Runnable() {
-            @Override
-            @SuppressFBWarnings("DM_EXIT")
-            public void run()  {
-                try {
-                    // CommandLine must be initialized before everything else.
-                    synchronized (mMainThread) {
-                        while (mCommandLineParams == null) {
-                            mMainThread.wait();
-                        }
-                    }
-                    CommandLine.init(mCommandLineParams);
-
-                    Linker linker = null;
-                    boolean requestedSharedRelro = false;
-                    if (Linker.isUsed()) {
-                        synchronized (mMainThread) {
-                            while (!mIsBound) {
-                                mMainThread.wait();
-                            }
-                        }
-                        linker = getLinker();
-                        if (mLinkerParams.mWaitForSharedRelro) {
-                            requestedSharedRelro = true;
-                            linker.initServiceProcess(mLinkerParams.mBaseLoadAddress);
-                        } else {
-                            linker.disableSharedRelros();
-                        }
-                    }
-                    boolean isLoaded = false;
-                    if (CommandLine.getInstance().hasSwitch(
-                            BaseSwitches.RENDERER_WAIT_FOR_JAVA_DEBUGGER)) {
-                        android.os.Debug.waitForDebugger();
-                    }
-
-                    boolean loadAtFixedAddressFailed = false;
-                    try {
-                        LibraryLoader.get(mLibraryProcessType).loadNow(getApplicationContext());
-                        isLoaded = true;
-                    } catch (ProcessInitException e) {
-                        if (requestedSharedRelro) {
-                            Log.w(TAG, "Failed to load native library with shared RELRO, "
-                                    + "retrying without");
-                            loadAtFixedAddressFailed = true;
-                        } else {
-                            Log.e(TAG, "Failed to load native library", e);
-                        }
-                    }
-                    if (!isLoaded && requestedSharedRelro) {
-                        linker.disableSharedRelros();
-                        try {
-                            LibraryLoader.get(mLibraryProcessType).loadNow(getApplicationContext());
-                            isLoaded = true;
-                        } catch (ProcessInitException e) {
-                            Log.e(TAG, "Failed to load native library on retry", e);
-                        }
-                    }
-                    if (!isLoaded) {
-                        System.exit(-1);
-                    }
-                    LibraryLoader.get(mLibraryProcessType)
-                            .registerRendererProcessHistogram(requestedSharedRelro,
-                                    loadAtFixedAddressFailed);
-                    LibraryLoader.get(mLibraryProcessType).initialize();
-                    synchronized (mMainThread) {
-                        mLibraryInitialized = true;
-                        mMainThread.notifyAll();
-                        while (mFdInfos == null) {
-                            mMainThread.wait();
-                        }
-                    }
-                    for (FileDescriptorInfo fdInfo : mFdInfos) {
-                        nativeRegisterGlobalFileDescriptor(
-                                fdInfo.mId, fdInfo.mFd.detachFd(), fdInfo.mOffset, fdInfo.mSize);
-                    }
-                    nativeInitChildProcess(ChildProcessService.this, mCpuCount, mCpuFeatures);
-                    if (mActivitySemaphore.tryAcquire()) {
-                        ContentMain.start();
-                        nativeExitChildProcess();
-                    }
-                } catch (InterruptedException e) {
-                    Log.w(TAG, "%s startup failed: %s", MAIN_THREAD_NAME, e);
-                } catch (ProcessInitException e) {
-                    Log.w(TAG, "%s startup failed: %s", MAIN_THREAD_NAME, e);
-                }
-            }
-        }, MAIN_THREAD_NAME);
-        mMainThread.start();
+        mChildProcessServiceImpl.create(getApplicationContext(),
+                getApplicationContext(), getClassLoader());
     }
 
     @Override
     @SuppressFBWarnings("DM_EXIT")
     public void onDestroy() {
-        Log.i(TAG, "Destroying ChildProcessService pid=%d", Process.myPid());
         super.onDestroy();
-        if (mActivitySemaphore.tryAcquire()) {
-            // TODO(crbug.com/457406): This is a bit hacky, but there is no known better solution
-            // as this service will get reused (at least if not sandboxed).
-            // In fact, we might really want to always exit() from onDestroy(), not just from
-            // the early return here.
-            System.exit(0);
-            return;
-        }
-        synchronized (mMainThread) {
-            try {
-                while (!mLibraryInitialized) {
-                    // Avoid a potential race in calling through to native code before the library
-                    // has loaded.
-                    mMainThread.wait();
-                }
-            } catch (InterruptedException e) {
-                // Ignore
-            }
-        }
-        // Try to shutdown the MainThread gracefully, but it might not
-        // have chance to exit normally.
-        nativeShutdownMainThread();
+        mChildProcessServiceImpl.destroy();
     }
 
     @Override
     public IBinder onBind(Intent intent) {
         // We call stopSelf() to request that this service be stopped as soon as the client
         // unbinds. Otherwise the system may keep it around and available for a reconnect. The
         // child processes do not currently support reconnect; they must be initialized from
         // scratch every time.
         stopSelf();
-        initializeParams(intent);
-        return mBinder;
+        return mChildProcessServiceImpl.bind(intent);
     }
 
     /**
      * Helper method to initialize the params from intent.
      * @param intent Intent to launch the service.
      */

[pkotwicz, 2016/06/10 21:29:47]

It feels weird to have initializeParams() and getServiceInfo() in this class.

I think that adding a getter for ChildProcessServiceImpl e.g.
ChildProcessService#getChildProcessServiceImpl() and making
DownloadProcessService use the getter would be better

[Xi Han, 2016/06/13 20:04:11]

Done.

     protected void initializeParams(Intent intent) {
-        synchronized (mMainThread) {
-            mCommandLineParams =
-                    intent.getStringArrayExtra(ChildProcessConstants.EXTRA_COMMAND_LINE);
-            // mLinkerParams is never used if Linker.isUsed() returns false.
-            // See onCreate().
-            mLinkerParams = new ChromiumLinkerParams(intent);
-            mLibraryProcessType = ChildProcessCreationParams.getLibraryProcessType(intent);
-            mIsBound = true;
-            mMainThread.notifyAll();
-        }
+        mChildProcessServiceImpl.initializeParams(intent);
     }
 
     /**
      * Helper method to get the information about the service from a given bundle.
      * @param bundle Bundle that contains the information to start the service.
      */
     void getServiceInfo(Bundle bundle) {
-        // Required to unparcel FileDescriptorInfo.
-        bundle.setClassLoader(getClassLoader());
-        synchronized (mMainThread) {
-            // Allow the command line to be set via bind() intent or setupConnection, but
-            // the FD can only be transferred here.
-            if (mCommandLineParams == null) {
-                mCommandLineParams =
-                        bundle.getStringArray(ChildProcessConstants.EXTRA_COMMAND_LINE);
-            }
-            // We must have received the command line by now
-            assert mCommandLineParams != null;
-            mCpuCount = bundle.getInt(ChildProcessConstants.EXTRA_CPU_COUNT);
-            mCpuFeatures = bundle.getLong(ChildProcessConstants.EXTRA_CPU_FEATURES);
-            assert mCpuCount > 0;
-            Parcelable[] fdInfosAsParcelable =
-                    bundle.getParcelableArray(ChildProcessConstants.EXTRA_FILES);
-            if (fdInfosAsParcelable != null) {
-                // For why this arraycopy is necessary:
-                // http://stackoverflow.com/questions/8745893/i-dont-get-why-this-classcastexception-occurs
-                mFdInfos = new FileDescriptorInfo[fdInfosAsParcelable.length];
-                System.arraycopy(fdInfosAsParcelable, 0, mFdInfos, 0, fdInfosAsParcelable.length);
-            } else {
-                String processType = ContentSwitches.getSwitchValue(
-                        mCommandLineParams, ContentSwitches.SWITCH_PROCESS_TYPE);
-                assert ContentSwitches.SWITCH_DOWNLOAD_PROCESS.equals(processType);
-                mFdInfos = EMPTY_FILE_DESCRIPTOR_INFO;
-            }
-            Bundle sharedRelros = bundle.getBundle(Linker.EXTRA_LINKER_SHARED_RELROS);
-            if (sharedRelros != null) {
-                getLinker().useSharedRelros(sharedRelros);
-                sharedRelros = null;
-            }
-            mMainThread.notifyAll();
-        }
+        mChildProcessServiceImpl.getServiceInfo(bundle);
     }
-
-    /**
-     * Called from native code to share a surface texture with another child process.
-     * Through using the callback object the browser is used as a proxy to route the
-     * call to the correct process.
-     *
-     * @param pid Process handle of the child process to share the SurfaceTexture with.
-     * @param surfaceObject The Surface or SurfaceTexture to share with the other child process.
-     * @param primaryID Used to route the call to the correct client instance.
-     * @param secondaryID Used to route the call to the correct client instance.
-     */
-    @SuppressWarnings("unused")
-    @CalledByNative
-    private void establishSurfaceTexturePeer(
-            int pid, Object surfaceObject, int primaryID, int secondaryID) {
-        if (mCallback == null) {
-            Log.e(TAG, "No callback interface has been provided.");
-            return;
-        }
-
-        Surface surface = null;
-        boolean needRelease = false;
-        if (surfaceObject instanceof Surface) {
-            surface = (Surface) surfaceObject;
-        } else if (surfaceObject instanceof SurfaceTexture) {
-            surface = new Surface((SurfaceTexture) surfaceObject);
-            needRelease = true;
-        } else {
-            Log.e(TAG, "Not a valid surfaceObject: %s", surfaceObject);
-            return;
-        }
-        try {
-            mCallback.establishSurfacePeer(pid, surface, primaryID, secondaryID);
-        } catch (RemoteException e) {
-            Log.e(TAG, "Unable to call establishSurfaceTexturePeer: %s", e);
-            return;
-        } finally {
-            if (needRelease) {
-                surface.release();
-            }
-        }
-    }
-
-    @SuppressWarnings("unused")
-    @CalledByNative
-    private Surface getViewSurface(int surfaceId) {
-        if (mCallback == null) {
-            Log.e(TAG, "No callback interface has been provided.");
-            return null;
-        }
-
-        try {
-            SurfaceWrapper wrapper = mCallback.getViewSurface(surfaceId);
-            return wrapper != null ? wrapper.getSurface() : null;
-        } catch (RemoteException e) {
-            Log.e(TAG, "Unable to call getViewSurface: %s", e);
-            return null;
-        }
-    }
-
-    @SuppressWarnings("unused")
-    @CalledByNative
-    private void createSurfaceTextureSurface(
-            int surfaceTextureId, int clientId, SurfaceTexture surfaceTexture) {
-        if (mCallback == null) {
-            Log.e(TAG, "No callback interface has been provided.");
-            return;
-        }
-
-        Surface surface = new Surface(surfaceTexture);
-        try {
-            mCallback.registerSurfaceTextureSurface(surfaceTextureId, clientId, surface);
-        } catch (RemoteException e) {
-            Log.e(TAG, "Unable to call registerSurfaceTextureSurface: %s", e);
-        }
-        surface.release();
-    }
-
-    @SuppressWarnings("unused")
-    @CalledByNative
-    private void destroySurfaceTextureSurface(int surfaceTextureId, int clientId) {
-        if (mCallback == null) {
-            Log.e(TAG, "No callback interface has been provided.");
-            return;
-        }
-
-        try {
-            mCallback.unregisterSurfaceTextureSurface(surfaceTextureId, clientId);
-        } catch (RemoteException e) {
-            Log.e(TAG, "Unable to call unregisterSurfaceTextureSurface: %s", e);
-        }
-    }
-
-    @SuppressWarnings("unused")
-    @CalledByNative
-    private Surface getSurfaceTextureSurface(int surfaceTextureId) {
-        if (mCallback == null) {
-            Log.e(TAG, "No callback interface has been provided.");
-            return null;
-        }
-
-        try {
-            return mCallback.getSurfaceTextureSurface(surfaceTextureId).getSurface();
-        } catch (RemoteException e) {
-            Log.e(TAG, "Unable to call getSurfaceTextureSurface: %s", e);
-            return null;
-        }
-    }
-
-    /**
-     * Helper for registering FileDescriptorInfo objects with GlobalFileDescriptors.
-     * This includes the IPC channel, the crash dump signals and resource related
-     * files.
-     */
-    private static native void nativeRegisterGlobalFileDescriptor(
-            int id, int fd, long offset, long size);
-
-    /**
-     * The main entry point for a child process. This should be called from a new thread since
-     * it will not return until the child process exits. See child_process_service.{h,cc}
-     *
-     * @param service The current ChildProcessService object.
-     * renderer.
-     */
-    private static native void nativeInitChildProcess(
-            ChildProcessService service, int cpuCount, long cpuFeatures);
-
-    /**
-     * Force the child process to exit.
-     */
-    private static native void nativeExitChildProcess();
-
-    private native void nativeShutdownMainThread();
 }