Refactor ZygoteInit to support a WebView-specific zygote. (dd4bb316) · Commits · e / os / android_frameworks_base

core/java/com/android/internal/os/RuntimeInit.java

+5 −5

Original line number	Original line	Diff line number	Diff line
	@@ -230,7 +230,7 @@ public class RuntimeInit {
	* @param classLoader the classLoader to load {@className} with		* @param classLoader the classLoader to load {@className} with
	*/		*/
	private static void invokeStaticMain(String className, String[] argv, ClassLoader classLoader)		private static void invokeStaticMain(String className, String[] argv, ClassLoader classLoader)
	throws ZygoteInit.MethodAndArgsCaller {		throws Zygote.MethodAndArgsCaller {
	Class<?> cl;		Class<?> cl;

	try {		try {
	@@ -264,7 +264,7 @@ public class RuntimeInit {
	* clears up all the stack frames that were required in setting		* clears up all the stack frames that were required in setting
	* up the process.		* up the process.
	*/		*/
	throw new ZygoteInit.MethodAndArgsCaller(m, argv);		throw new Zygote.MethodAndArgsCaller(m, argv);
	}		}

	public static final void main(String[] argv) {		public static final void main(String[] argv) {
	@@ -301,7 +301,7 @@ public class RuntimeInit {
	* @param argv arg strings		* @param argv arg strings
	*/		*/
	public static final void zygoteInit(int targetSdkVersion, String[] argv, ClassLoader classLoader)		public static final void zygoteInit(int targetSdkVersion, String[] argv, ClassLoader classLoader)
	throws ZygoteInit.MethodAndArgsCaller {		throws Zygote.MethodAndArgsCaller {
	if (DEBUG) Slog.d(TAG, "RuntimeInit: Starting application from zygote");		if (DEBUG) Slog.d(TAG, "RuntimeInit: Starting application from zygote");

	Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "RuntimeInit");		Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "RuntimeInit");
	@@ -324,14 +324,14 @@ public class RuntimeInit {
	* @param argv arg strings		* @param argv arg strings
	*/		*/
	public static void wrapperInit(int targetSdkVersion, String[] argv)		public static void wrapperInit(int targetSdkVersion, String[] argv)
	throws ZygoteInit.MethodAndArgsCaller {		throws Zygote.MethodAndArgsCaller {
	if (DEBUG) Slog.d(TAG, "RuntimeInit: Starting application from wrapper");		if (DEBUG) Slog.d(TAG, "RuntimeInit: Starting application from wrapper");

	applicationInit(targetSdkVersion, argv, null);		applicationInit(targetSdkVersion, argv, null);
	}		}

	private static void applicationInit(int targetSdkVersion, String[] argv, ClassLoader classLoader)		private static void applicationInit(int targetSdkVersion, String[] argv, ClassLoader classLoader)
	throws ZygoteInit.MethodAndArgsCaller {		throws Zygote.MethodAndArgsCaller {
	// If the application calls System.exit(), terminate the process		// If the application calls System.exit(), terminate the process
	// immediately without running any shutdown hooks. It is not possible to		// immediately without running any shutdown hooks. It is not possible to
	// shutdown an Android application gracefully. Among other things, the		// shutdown an Android application gracefully. Among other things, the

core/java/com/android/internal/os/WebViewZygoteInit.java

0 → 100644

+32 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* Copyright (C) 2016 The Android Open Source Project
			*
			* Licensed under the Apache License, Version 2.0 (the "License");
			* you may not use this file except in compliance with the License.
			* You may obtain a copy of the License at
			*
			* http://www.apache.org/licenses/LICENSE-2.0
			*
			* Unless required by applicable law or agreed to in writing, software
			* distributed under the License is distributed on an "AS IS" BASIS,
			* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
			* See the License for the specific language governing permissions and
			* limitations under the License.
			*/

			package com.android.internal.os;

			/**
			* Startup class for the WebView zygote process.
			*
			* See {@link ZygoteInit} for generic zygote startup documentation.
			*
			* @hide
			*/
			class WebViewZygoteInit {
			public static final String TAG = "WebViewZygoteInit";

			public static void main(String argv[]) {
			throw new RuntimeException("Not implemented yet");
			}
			}

core/java/com/android/internal/os/WrapperInit.java

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -74,14 +74,14 @@ public class WrapperInit {
	}		}
	}		}

	// Mimic Zygote preloading.		// Mimic system Zygote preloading.
	ZygoteInit.preload();		ZygoteInit.preload();

	// Launch the application.		// Launch the application.
	String[] runtimeArgs = new String[args.length - 2];		String[] runtimeArgs = new String[args.length - 2];
	System.arraycopy(args, 2, runtimeArgs, 0, runtimeArgs.length);		System.arraycopy(args, 2, runtimeArgs, 0, runtimeArgs.length);
	RuntimeInit.wrapperInit(targetSdkVersion, runtimeArgs);		RuntimeInit.wrapperInit(targetSdkVersion, runtimeArgs);
	} catch (ZygoteInit.MethodAndArgsCaller caller) {		} catch (Zygote.MethodAndArgsCaller caller) {
	caller.run();		caller.run();
	}		}
	}		}

core/java/com/android/internal/os/Zygote.java

+38 −0

Original line number	Original line	Diff line number	Diff line
	@@ -22,6 +22,9 @@ import dalvik.system.ZygoteHooks;
	import android.system.ErrnoException;		import android.system.ErrnoException;
	import android.system.Os;		import android.system.Os;

			import java.lang.reflect.InvocationTargetException;
			import java.lang.reflect.Method;

	/** @hide */		/** @hide */
	public final class Zygote {		public final class Zygote {
	/*		/*
	@@ -191,4 +194,39 @@ public final class Zygote {
	command.append(" '").append(arg.replace("'", "'\\''")).append("'");		command.append(" '").append(arg.replace("'", "'\\''")).append("'");
	}		}
	}		}

			/**
			* Helper exception class which holds a method and arguments and
			* can call them. This is used as part of a trampoline to get rid of
			* the initial process setup stack frames.
			*/
			public static class MethodAndArgsCaller extends Exception
			implements Runnable {
			/** method to call */
			private final Method mMethod;

			/** argument array */
			private final String[] mArgs;

			public MethodAndArgsCaller(Method method, String[] args) {
			mMethod = method;
			mArgs = args;
			}

			public void run() {
			try {
			mMethod.invoke(null, new Object[] { mArgs });
			} catch (IllegalAccessException ex) {
			throw new RuntimeException(ex);
			} catch (InvocationTargetException ex) {
			Throwable cause = ex.getCause();
			if (cause instanceof RuntimeException) {
			throw (RuntimeException) cause;
			} else if (cause instanceof Error) {
			throw (Error) cause;
			}
			throw new RuntimeException(ex);
			}
			}
			}
	}		}

core/java/com/android/internal/os/ZygoteConnection.java

+8 −9

Original line number	Original line	Diff line number	Diff line
	@@ -117,7 +117,7 @@ class ZygoteConnection {

	/**		/**
	* Reads one start command from the command socket. If successful,		* Reads one start command from the command socket. If successful,
	* a child is forked and a {@link ZygoteInit.MethodAndArgsCaller}		* a child is forked and a {@link Zygote.MethodAndArgsCaller}
	* exception is thrown in that child while in the parent process,		* exception is thrown in that child while in the parent process,
	* the method returns normally. On failure, the child is not		* the method returns normally. On failure, the child is not
	* spawned and messages are printed to the log and stderr. Returns		* spawned and messages are printed to the log and stderr. Returns
	@@ -126,10 +126,10 @@ class ZygoteConnection {
	*		*
	* @return false if command socket should continue to be read from, or		* @return false if command socket should continue to be read from, or
	* true if an end-of-file has been encountered.		* true if an end-of-file has been encountered.
	* @throws ZygoteInit.MethodAndArgsCaller trampoline to invoke main()		* @throws Zygote.MethodAndArgsCaller trampoline to invoke main()
	* method in child process		* method in child process
	*/		*/
	boolean runOnce() throws ZygoteInit.MethodAndArgsCaller {		boolean runOnce(ZygoteServer zygoteServer) throws Zygote.MethodAndArgsCaller {

	String args[];		String args[];
	Arguments parsedArgs = null;		Arguments parsedArgs = null;
	@@ -214,7 +214,7 @@ class ZygoteConnection {
	fdsToClose[0] = fd.getInt$();		fdsToClose[0] = fd.getInt$();
	}		}

	fd = ZygoteInit.getServerSocketFileDescriptor();		fd = zygoteServer.getServerSocketFileDescriptor();

	if (fd != null) {		if (fd != null) {
	fdsToClose[1] = fd.getInt$();		fdsToClose[1] = fd.getInt$();
	@@ -238,12 +238,13 @@ class ZygoteConnection {
	try {		try {
	if (pid == 0) {		if (pid == 0) {
	// in child		// in child
			zygoteServer.closeServerSocket();
	IoUtils.closeQuietly(serverPipeFd);		IoUtils.closeQuietly(serverPipeFd);
	serverPipeFd = null;		serverPipeFd = null;
	handleChildProc(parsedArgs, descriptors, childPipeFd, newStderr);		handleChildProc(parsedArgs, descriptors, childPipeFd, newStderr);

	// should never get here, the child is expected to either		// should never get here, the child is expected to either
	// throw ZygoteInit.MethodAndArgsCaller or exec().		// throw Zygote.MethodAndArgsCaller or exec().
	return true;		return true;
	} else {		} else {
	// in parent...pid of < 0 means failure		// in parent...pid of < 0 means failure
	@@ -712,12 +713,12 @@ class ZygoteConnection {
	* @param newStderr null-ok; stream to use for stderr until stdio		* @param newStderr null-ok; stream to use for stderr until stdio
	* is reopened.		* is reopened.
	*		*
	* @throws ZygoteInit.MethodAndArgsCaller on success to		* @throws Zygote.MethodAndArgsCaller on success to
	* trampoline to code that invokes static main.		* trampoline to code that invokes static main.
	*/		*/
	private void handleChildProc(Arguments parsedArgs,		private void handleChildProc(Arguments parsedArgs,
	FileDescriptor[] descriptors, FileDescriptor pipeFd, PrintStream newStderr)		FileDescriptor[] descriptors, FileDescriptor pipeFd, PrintStream newStderr)
	throws ZygoteInit.MethodAndArgsCaller {		throws Zygote.MethodAndArgsCaller {
	/**		/**
	* By the time we get here, the native code has closed the two actual Zygote		* By the time we get here, the native code has closed the two actual Zygote
	* socket connections, and substituted /dev/null in their place. The LocalSocket		* socket connections, and substituted /dev/null in their place. The LocalSocket
	@@ -725,8 +726,6 @@ class ZygoteConnection {
	*/		*/

	closeSocket();		closeSocket();
	ZygoteInit.closeServerSocket();

	if (descriptors != null) {		if (descriptors != null) {
	try {		try {
	Os.dup2(descriptors[0], STDIN_FILENO);		Os.dup2(descriptors[0], STDIN_FILENO);