blob: 88579ded07cf87b6fda982ce7b4d930f2d3eed2f [file] [log] [blame]
/*
* 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.
*/
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.out);
} 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.out);
}
}
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);
}
}
}