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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 import java.io.BufferedReader;
     18 import java.io.FileReader;
     19 import java.io.InputStreamReader;
     20 import java.util.Arrays;
     21 import java.util.Comparator;
     22 
     23 public class Main extends Base implements Comparator<Main> {
     24   // Whether to test local unwinding.
     25   private static boolean testLocal;
     26 
     27   // Unwinding another process, modelling debuggerd.
     28   private static boolean testRemote;
     29 
     30   // We fork ourself to create the secondary process for remote unwinding.
     31   private static boolean secondary;
     32 
     33   public static void main(String[] args) throws Exception {
     34       System.loadLibrary(args[0]);
     35       for (int i = 1; i < args.length; i++) {
     36           if (args[i].equals("--test-local")) {
     37               testLocal = true;
     38           } else if (args[i].equals("--test-remote")) {
     39               testRemote = true;
     40           } else if (args[i].equals("--secondary")) {
     41               secondary = true;
     42           } else {
     43               System.out.println("Unknown argument: " + args[i]);
     44               System.exit(1);
     45           }
     46       }
     47 
     48       // Call test() via base class to test unwinding through multidex.
     49       new Main().$noinline$runTest();
     50   }
     51 
     52   public void test() {
     53       // Call unwind() via Arrays.binarySearch to test unwinding through framework.
     54       Main[] array = { this, this, this };
     55       Arrays.binarySearch(array, 0, 3, this /* value */, this /* comparator */);
     56   }
     57 
     58   public int compare(Main lhs, Main rhs) {
     59       unwind();
     60       // Returning "equal" ensures that we terminate search
     61       // after first item and thus call unwind() only once.
     62       return 0;
     63   }
     64 
     65   public void unwind() {
     66       if (secondary) {
     67           sigstop();  // This is helper child process. Stop and wait for unwinding.
     68           return;     // Don't run the tests again in the secondary helper process.
     69       }
     70 
     71       if (testLocal) {
     72           String result = unwindInProcess() ? "PASS" : "FAIL";
     73           System.out.println("Unwind in process: " + result);
     74       }
     75 
     76       if (testRemote) {
     77           // Start a secondary helper process. It will stop itself when it is ready.
     78           int pid = startSecondaryProcess();
     79           // Wait for the secondary process to stop and then unwind it remotely.
     80           String result = unwindOtherProcess(pid) ? "PASS" : "FAIL";
     81           System.out.println("Unwind other process: " + result);
     82       }
     83   }
     84 
     85   public static native int startSecondaryProcess();
     86   public static native boolean sigstop();
     87   public static native boolean unwindInProcess();
     88   public static native boolean unwindOtherProcess(int pid);
     89 }
     90