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-rw-r--r--core/java/android/app/ApplicationLoaders.java151
-rw-r--r--core/java/android/app/LoadedApk.java2
-rw-r--r--core/java/com/android/internal/os/ZygoteInit.java31
3 files changed, 182 insertions, 2 deletions
diff --git a/core/java/android/app/ApplicationLoaders.java b/core/java/android/app/ApplicationLoaders.java
index 9ef24c6c2aeb..faa30f3a98b8 100644
--- a/core/java/android/app/ApplicationLoaders.java
+++ b/core/java/android/app/ApplicationLoaders.java
@@ -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);
- mLoaders.put(cacheKey, classloader);
+ if (cacheKey != null) {
+ mLoaders.put(cacheKey, classloader);
+ }
return classloader;
}
@@ -108,6 +137,112 @@ 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
* startup and enables memory sharing.
@@ -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;
}
diff --git a/core/java/android/app/LoadedApk.java b/core/java/android/app/LoadedApk.java
index 0f1ba390cd7a..53849ba92339 100644
--- a/core/java/android/app/LoadedApk.java
+++ b/core/java/android/app/LoadedApk.java
@@ -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);
diff --git a/core/java/com/android/internal/os/ZygoteInit.java b/core/java/com/android/internal/os/ZygoteInit.java
index ce1ee3dc957a..2abc8c080ac1 100644
--- a/core/java/com/android/internal/os/ZygoteInit.java
+++ b/core/java/com/android/internal/os/ZygoteInit.java
@@ -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
@@ -347,6 +352,32 @@ 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.
*
* These tend to be a few Kbytes, but are frequently in the 20-40K range, and occasionally even
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-10-21 16:03:26 +0000