/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.io.File;
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import java.io.IOException;
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import java.lang.reflect.Method;
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/**
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* Controls deoptimization using dalvik.system.VMDebug class.
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*/
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public class DeoptimizationController {
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private static final String TEMP_FILE_NAME_PREFIX = "test";
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private static final String TEMP_FILE_NAME_SUFFIX = ".trace";
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private static File createTempFile() throws Exception {
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try {
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return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
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} catch (IOException e) {
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System.setProperty("java.io.tmpdir", "/data/local/tmp");
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try {
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return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
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} catch (IOException e2) {
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System.setProperty("java.io.tmpdir", "/sdcard");
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return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
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}
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}
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}
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public static void startDeoptimization() {
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File tempFile = null;
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try {
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tempFile = createTempFile();
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String tempFileName = tempFile.getPath();
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VMDebug.startMethodTracing(tempFileName, 0, 0, false, 1000);
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if (VMDebug.getMethodTracingMode() == 0) {
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throw new IllegalStateException("Not tracing.");
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}
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} catch (Exception exc) {
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exc.printStackTrace(System.out);
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} finally {
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if (tempFile != null) {
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tempFile.delete();
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}
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}
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}
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public static void stopDeoptimization() {
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try {
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VMDebug.stopMethodTracing();
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if (VMDebug.getMethodTracingMode() != 0) {
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throw new IllegalStateException("Still tracing.");
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}
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} catch (Exception exc) {
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exc.printStackTrace(System.out);
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}
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}
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private static class VMDebug {
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private static final Method startMethodTracingMethod;
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private static final Method stopMethodTracingMethod;
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private static final Method getMethodTracingModeMethod;
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static {
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try {
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Class<?> c = Class.forName("dalvik.system.VMDebug");
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startMethodTracingMethod = c.getDeclaredMethod("startMethodTracing", String.class,
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Integer.TYPE, Integer.TYPE, Boolean.TYPE, Integer.TYPE);
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stopMethodTracingMethod = c.getDeclaredMethod("stopMethodTracing");
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getMethodTracingModeMethod = c.getDeclaredMethod("getMethodTracingMode");
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static void startMethodTracing(String filename, int bufferSize, int flags,
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boolean samplingEnabled, int intervalUs) throws Exception {
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startMethodTracingMethod.invoke(null, filename, bufferSize, flags, samplingEnabled,
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intervalUs);
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}
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public static void stopMethodTracing() throws Exception {
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stopMethodTracingMethod.invoke(null);
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}
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public static int getMethodTracingMode() throws Exception {
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return (int) getMethodTracingModeMethod.invoke(null);
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}
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}
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}
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