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