content: /*
   * Copyright (C) 2015 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.
   */
  
  // This file is a copy of 802-deoptimization/src/DeoptimizationController.java
  // because run-test requires standalone individual test.
  
  import java.io.File;
  import java.io.IOException;
  import java.lang.reflect.Method;
  
  /**
   * Controls deoptimization using dalvik.system.VMDebug class.
   */
  public class DeoptimizationController {
    private static final String TEMP_FILE_NAME_PREFIX = "test";
    private static final String TEMP_FILE_NAME_SUFFIX = ".trace";
  
    private static File createTempFile() throws Exception {
      try {
        return  File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
      } catch (IOException e) {
        System.setProperty("java.io.tmpdir", "/data/local/tmp");
        try {
          return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
        } catch (IOException e2) {
          System.setProperty("java.io.tmpdir", "/sdcard");
          return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
        }
      }
    }
  
    public static void startDeoptimization() {
      File tempFile = null;
      try {
        tempFile = createTempFile();
        String tempFileName = tempFile.getPath();
  
        VMDebug.startMethodTracing(tempFileName, 0, 0, false, 1000);
        if (VMDebug.getMethodTracingMode() == 0) {
          throw new IllegalStateException("Not tracing.");
        }
      } catch (Exception exc) {
        exc.printStackTrace(System.err);
      } finally {
        if (tempFile != null) {
          tempFile.delete();
        }
      }
    }
  
    public static void stopDeoptimization() {
      try {
        VMDebug.stopMethodTracing();
        if (VMDebug.getMethodTracingMode() != 0) {
          throw new IllegalStateException("Still tracing.");
        }
      } catch (Exception exc) {
        exc.printStackTrace(System.err);
      }
    }
  
    private static class VMDebug {
      private static final Method startMethodTracingMethod;
      private static final Method stopMethodTracingMethod;
      private static final Method getMethodTracingModeMethod;
  
      static {
        try {
          Class<?> c = Class.forName("dalvik.system.VMDebug");
          startMethodTracingMethod = c.getDeclaredMethod("startMethodTracing", String.class,
              Integer.TYPE, Integer.TYPE, Boolean.TYPE, Integer.TYPE);
          stopMethodTracingMethod = c.getDeclaredMethod("stopMethodTracing");
          getMethodTracingModeMethod = c.getDeclaredMethod("getMethodTracingMode");
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
      }
  
      public static void startMethodTracing(String filename, int bufferSize, int flags,
          boolean samplingEnabled, int intervalUs) throws Exception {
        startMethodTracingMethod.invoke(null, filename, bufferSize, flags, samplingEnabled,
            intervalUs);
      }
      public static void stopMethodTracing() throws Exception {
        stopMethodTracingMethod.invoke(null);
      }
      public static int getMethodTracingMode() throws Exception {
        return (int) getMethodTracingModeMethod.invoke(null);
      }
    }
  }
  