| /* |
| * Copyright (C) 2008 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. |
| */ |
| |
| import java.io.BufferedWriter; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| import java.nio.charset.Charset; |
| import java.util.Set; |
| import java.util.TreeSet; |
| |
| /** |
| * Writes /frameworks/base/preloaded-classes. Also updates LoadedClass.preloaded |
| * fields and writes over compiled log file. |
| */ |
| public class WritePreloadedClassFile { |
| |
| public static void main(String[] args) throws IOException, ClassNotFoundException { |
| if (args.length != 1) { |
| System.err.println("Usage: WritePreloadedClassFile [compiled log]"); |
| System.exit(-1); |
| } |
| String rootFile = args[0]; |
| Root root = Root.fromFile(rootFile); |
| |
| // No classes are preloaded to start. |
| for (LoadedClass loadedClass : root.loadedClasses.values()) { |
| loadedClass.preloaded = false; |
| } |
| |
| // Open preloaded-classes file for output. |
| Writer out = new BufferedWriter(new OutputStreamWriter( |
| new FileOutputStream(Policy.getPreloadedClassFileName()), |
| Charset.forName("US-ASCII"))); |
| |
| out.write("# Classes which are preloaded by com.android.internal.os.ZygoteInit.\n"); |
| out.write("# Automatically generated by /frameworks/base/tools/preload.\n"); |
| out.write("# percent=" + Proc.PERCENTAGE_TO_PRELOAD |
| + ", weight=" + ClassRank.SEQUENCE_WEIGHT |
| + ", bucket_size=" + ClassRank.BUCKET_SIZE |
| + "\n"); |
| |
| Set<LoadedClass> toPreload = new TreeSet<LoadedClass>(); |
| |
| // Preload all classes that were loaded by at least 2 apps, if both |
| // apps run at the same time, they'll share memory. |
| for (LoadedClass loadedClass : root.loadedClasses.values()) { |
| if (!loadedClass.isPreloadable()) { |
| continue; |
| } |
| |
| Set<String> appNames = loadedClass.applicationNames(); |
| |
| if (appNames.size() > 3) { |
| toPreload.add(loadedClass); |
| } |
| } |
| |
| // Try to make individual apps start faster by preloading slowest |
| // classes. |
| for (Proc proc : root.processes.values()) { |
| toPreload.addAll(proc.highestRankedClasses()); |
| } |
| |
| System.out.println(toPreload.size() + " classes will be preloaded."); |
| |
| // Make classes that were already loaded by the zygote explicit. |
| // This adds minimal overhead but avoid confusion about classes not |
| // appearing in the list. |
| addAllClassesFor("zygote", root, toPreload); |
| |
| for (LoadedClass loadedClass : toPreload) { |
| out.write(loadedClass.name); |
| out.write('\n'); |
| } |
| |
| out.close(); |
| |
| // Update data to reflect LoadedClass.preloaded changes. |
| for (LoadedClass loadedClass : toPreload) { |
| loadedClass.preloaded = true; |
| } |
| root.toFile(rootFile); |
| } |
| |
| private static void addAllClassesFor(String packageName, Root root, |
| Set<LoadedClass> toPreload) { |
| for (Proc proc : root.processes.values()) { |
| if (proc.name.equals(packageName)) { |
| for (Operation operation : proc.operations) { |
| // TODO: I'm not sure how the zygote loaded classes that |
| // aren't supposed to be preloadable... |
| if (operation.loadedClass.isPreloadable()) { |
| toPreload.add(operation.loadedClass); |
| } |
| } |
| } |
| } |
| } |
| } |