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// This file is a copy of 802-deoptimization/src/DeoptimizationController.java
18// because run-test requires standalone individual test.
19
20import java.io.File;
21import java.io.IOException;
22import java.lang.reflect.Method;
23
24/**
25 * Controls deoptimization using dalvik.system.VMDebug class.
26 */
27public class DeoptimizationController {
28  private static final String TEMP_FILE_NAME_PREFIX = "test";
29  private static final String TEMP_FILE_NAME_SUFFIX = ".trace";
30
31  private static File createTempFile() throws Exception {
32    try {
33      return  File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
34    } catch (IOException e) {
35      System.setProperty("java.io.tmpdir", "/data/local/tmp");
36      try {
37        return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
38      } catch (IOException e2) {
39        System.setProperty("java.io.tmpdir", "/sdcard");
40        return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
41      }
42    }
43  }
44
45  public static void startDeoptimization() {
46    File tempFile = null;
47    try {
48      tempFile = createTempFile();
49      String tempFileName = tempFile.getPath();
50
51      VMDebug.startMethodTracing(tempFileName, 0, 0, false, 1000);
52      if (VMDebug.getMethodTracingMode() == 0) {
53        throw new IllegalStateException("Not tracing.");
54      }
55    } catch (Exception exc) {
56      exc.printStackTrace(System.err);
57    } finally {
58      if (tempFile != null) {
59        tempFile.delete();
60      }
61    }
62  }
63
64  public static void stopDeoptimization() {
65    try {
66      VMDebug.stopMethodTracing();
67      if (VMDebug.getMethodTracingMode() != 0) {
68        throw new IllegalStateException("Still tracing.");
69      }
70    } catch (Exception exc) {
71      exc.printStackTrace(System.err);
72    }
73  }
74
75  private static class VMDebug {
76    private static final Method startMethodTracingMethod;
77    private static final Method stopMethodTracingMethod;
78    private static final Method getMethodTracingModeMethod;
79
80    static {
81      try {
82        Class<?> c = Class.forName("dalvik.system.VMDebug");
83        startMethodTracingMethod = c.getDeclaredMethod("startMethodTracing", String.class,
84            Integer.TYPE, Integer.TYPE, Boolean.TYPE, Integer.TYPE);
85        stopMethodTracingMethod = c.getDeclaredMethod("stopMethodTracing");
86        getMethodTracingModeMethod = c.getDeclaredMethod("getMethodTracingMode");
87      } catch (Exception e) {
88        throw new RuntimeException(e);
89      }
90    }
91
92    public static void startMethodTracing(String filename, int bufferSize, int flags,
93        boolean samplingEnabled, int intervalUs) throws Exception {
94      startMethodTracingMethod.invoke(null, filename, bufferSize, flags, samplingEnabled,
95          intervalUs);
96    }
97    public static void stopMethodTracing() throws Exception {
98      stopMethodTracingMethod.invoke(null);
99    }
100    public static int getMethodTracingMode() throws Exception {
101      return (int) getMethodTracingModeMethod.invoke(null);
102    }
103  }
104}
105