Merge "Revert "Revert "Preload non-bootclasspath Java lib ClassLoaders.""" (4e709ea3) · Commits · e / os / android_frameworks_base

core/java/android/app/ApplicationLoaders.java

+150 −1

Original line number	Diff line number	Diff line
		@@ -17,20 +17,27 @@
		package android.app;

		import android.annotation.UnsupportedAppUsage;
		import android.content.pm.SharedLibraryInfo;
		import android.os.Build;
		import android.os.GraphicsEnvironment;
		import android.os.Trace;
		import android.util.ArrayMap;
		import android.util.Log;

		import com.android.internal.os.ClassLoaderFactory;

		import dalvik.system.PathClassLoader;

		import java.util.ArrayList;
		import java.util.Collection;
		import java.util.HashMap;
		import java.util.List;
		import java.util.Map;

		/** @hide */
		public class ApplicationLoaders {
		private static final String TAG = "ApplicationLoaders";

		@UnsupportedAppUsage
		public static ApplicationLoaders getDefault() {
		return gApplicationLoaders;
		@@ -54,6 +61,26 @@ public class ApplicationLoaders {
		libraryPermittedPath, parent, zip, classLoaderName, sharedLibraries);
		}

		/**
		* Gets a class loader for a shared library. Additional dependent shared libraries are allowed
		* to be specified (sharedLibraries).
		*
		* Additionally, as an optimization, this will return a pre-created ClassLoader if one has
		* been cached by createAndCacheNonBootclasspathSystemClassLoaders.
		*/
		ClassLoader getSharedLibraryClassLoaderWithSharedLibraries(String zip, int targetSdkVersion,
		boolean isBundled, String librarySearchPath, String libraryPermittedPath,
		ClassLoader parent, String classLoaderName, List<ClassLoader> sharedLibraries) {
		ClassLoader loader = getCachedNonBootclasspathSystemLib(zip, parent, classLoaderName,
		sharedLibraries);
		if (loader != null) {
		return loader;
		}

		return getClassLoaderWithSharedLibraries(zip, targetSdkVersion, isBundled,
		librarySearchPath, libraryPermittedPath, parent, classLoaderName, sharedLibraries);
		}

		private ClassLoader getClassLoader(String zip, int targetSdkVersion, boolean isBundled,
		String librarySearchPath, String libraryPermittedPath,
		ClassLoader parent, String cacheKey,
		@@ -95,7 +122,9 @@ public class ApplicationLoaders {
		classloader, librarySearchPath, libraryPermittedPath);
		Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);

		if (cacheKey != null) {
		mLoaders.put(cacheKey, classloader);
		}
		return classloader;
		}

		@@ -107,6 +136,112 @@ public class ApplicationLoaders {
		}
		}

		/**
		* Caches system library class loaders which are not on the bootclasspath but are still used
		* by many system apps.
		*
		* All libraries in the closure of libraries to be loaded must be in libs. A library can
		* only depend on libraries that come before it in the list.
		*/
		public void createAndCacheNonBootclasspathSystemClassLoaders(SharedLibraryInfo[] libs) {
		if (mSystemLibsCacheMap != null) {
		Log.wtf(TAG, "Already cached.");
		return;
		}

		mSystemLibsCacheMap = new HashMap<String, CachedClassLoader>();

		for (SharedLibraryInfo lib : libs) {
		createAndCacheNonBootclasspathSystemClassLoader(lib);
		}
		}

		/**
		* Caches a single non-bootclasspath class loader.
		*
		* All of this library's dependencies must have previously been cached.
		*/
		private void createAndCacheNonBootclasspathSystemClassLoader(SharedLibraryInfo lib) {
		String path = lib.getPath();
		List<SharedLibraryInfo> dependencies = lib.getDependencies();

		// get cached classloaders for dependencies
		ArrayList<ClassLoader> sharedLibraries = null;
		if (dependencies != null) {
		sharedLibraries = new ArrayList<ClassLoader>(dependencies.size());
		for (SharedLibraryInfo dependency : dependencies) {
		String dependencyPath = dependency.getPath();
		CachedClassLoader cached = mSystemLibsCacheMap.get(dependencyPath);

		if (cached == null) {
		Log.e(TAG, "Failed to find dependency " + dependencyPath
		+ " of cached library " + path);
		return;
		}

		sharedLibraries.add(cached.loader);
		}
		}

		// assume cached libraries work with current sdk since they are built-in
		ClassLoader classLoader = getClassLoader(path, Build.VERSION.SDK_INT, true /isBundled/,
		null /librarySearchPath/, null /libraryPermittedPath/, null /parent/,
		null /cacheKey/, null /classLoaderName/, sharedLibraries /sharedLibraries/);

		if (classLoader == null) {
		Log.e(TAG, "Failed to cache " + path);
		return;
		}

		CachedClassLoader cached = new CachedClassLoader();
		cached.loader = classLoader;
		cached.sharedLibraries = sharedLibraries;

		Log.d(TAG, "Created zygote-cached class loader: " + path);
		mSystemLibsCacheMap.put(path, cached);
		}

		private static boolean sharedLibrariesEquals(List<ClassLoader> lhs, List<ClassLoader> rhs) {
		if (lhs == null) {
		return rhs == null;
		}

		return lhs.equals(rhs);
		}

		/**
		* Returns lib cached with createAndCacheNonBootclasspathSystemClassLoader. This is called by
		* the zygote during caching.
		*
		* If there is an error or the cache is not available, this returns null.
		*/
		private ClassLoader getCachedNonBootclasspathSystemLib(String zip, ClassLoader parent,
		String classLoaderName, List<ClassLoader> sharedLibraries) {
		if (mSystemLibsCacheMap == null) {
		return null;
		}

		// we only cache top-level libs with the default class loader
		if (parent != null \|\| classLoaderName != null) {
		return null;
		}

		CachedClassLoader cached = mSystemLibsCacheMap.get(zip);
		if (cached == null) {
		return null;
		}

		// cached must be built and loaded in the same environment
		if (!sharedLibrariesEquals(sharedLibraries, cached.sharedLibraries)) {
		Log.w(TAG, "Unexpected environment for cached library: (" + sharedLibraries + "\|"
		+ cached.sharedLibraries + ")");
		return null;
		}

		Log.d(TAG, "Returning zygote-cached class loader: " + zip);
		return cached.loader;
		}

		/**
		* Creates a classloader for the WebView APK and places it in the cache of loaders maintained
		* by this class. This is used in the WebView zygote, where its presence in the cache speeds up
		@@ -151,4 +286,18 @@ public class ApplicationLoaders {
		private final ArrayMap<String, ClassLoader> mLoaders = new ArrayMap<>();

		private static final ApplicationLoaders gApplicationLoaders = new ApplicationLoaders();

		private static class CachedClassLoader {
		ClassLoader loader;

		/**
		* The shared libraries used when constructing loader for verification.
		*/
		List<ClassLoader> sharedLibraries;
		}

		/**
		* This is a map of zip to associated class loader.
		*/
		private Map<String, CachedClassLoader> mSystemLibsCacheMap = null;
		}

core/java/android/app/LoadedApk.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -675,7 +675,7 @@ public final class LoadedApk {

		// Shared libraries get a null parent: this has the side effect of having canonicalized
		// shared libraries using ApplicationLoaders cache, which is the behavior we want.
		return ApplicationLoaders.getDefault().getClassLoaderWithSharedLibraries(jars,
		return ApplicationLoaders.getDefault().getSharedLibraryClassLoaderWithSharedLibraries(jars,
		mApplicationInfo.targetSdkVersion, isBundledApp, librarySearchPath,
		libraryPermittedPath, /* parent */ null,
		/* classLoaderName */ null, sharedLibraries);

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

+31 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,8 @@ import static android.system.OsConstants.S_IRWXO;
		import android.annotation.UnsupportedAppUsage;
		import android.content.res.Resources;
		import android.content.res.TypedArray;
		import android.app.ApplicationLoaders;
		import android.content.pm.SharedLibraryInfo;
		import android.os.Build;
		import android.os.Environment;
		import android.os.IInstalld;
		@@ -141,6 +143,9 @@ public class ZygoteInit {
		bootTimingsTraceLog.traceBegin("PreloadClasses");
		preloadClasses();
		bootTimingsTraceLog.traceEnd(); // PreloadClasses
		bootTimingsTraceLog.traceBegin("CacheNonBootClasspathClassLoaders");
		cacheNonBootClasspathClassLoaders();
		bootTimingsTraceLog.traceEnd(); // CacheNonBootClasspathClassLoaders
		bootTimingsTraceLog.traceBegin("PreloadResources");
		preloadResources();
		bootTimingsTraceLog.traceEnd(); // PreloadResources
		@@ -346,6 +351,32 @@ public class ZygoteInit {
		}
		}

		/**
		* Load in things which are used by many apps but which cannot be put in the boot
		* classpath.
		*/
		private static void cacheNonBootClasspathClassLoaders() {
		// These libraries used to be part of the bootclasspath, but had to be removed.
		// Old system applications still get them for backwards compatibility reasons,
		// so they are cached here in order to preserve performance characteristics.
		SharedLibraryInfo hidlBase = new SharedLibraryInfo(
		"/system/framework/android.hidl.base-V1.0-java.jar", null /packageName/,
		null /codePaths/, null /name/, 0 /version/, SharedLibraryInfo.TYPE_BUILTIN,
		null /declaringPackage/, null /dependentPackages/, null /dependencies/);
		SharedLibraryInfo hidlManager = new SharedLibraryInfo(
		"/system/framework/android.hidl.manager-V1.0-java.jar", null /packageName/,
		null /codePaths/, null /name/, 0 /version/, SharedLibraryInfo.TYPE_BUILTIN,
		null /declaringPackage/, null /dependentPackages/, null /dependencies/);
		hidlManager.addDependency(hidlBase);

		ApplicationLoaders.getDefault().createAndCacheNonBootclasspathSystemClassLoaders(
		new SharedLibraryInfo[]{
		// ordered dependencies first
		hidlBase,
		hidlManager,
		});
		}

		/**
		* Load in commonly used resources, so they can be shared across processes.
		*