/*
* Copyright (C) 2014 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;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Map;
public class Main {
private static final String TEMP_FILE_NAME_PREFIX = "test";
private static final String TEMP_FILE_NAME_SUFFIX = ".trace";
public static void main(String[] args) throws Exception {
String name = System.getProperty("java.vm.name");
if (!"Dalvik".equals(name)) {
System.out.println("This test is not supported on " + name);
return;
}
testMethodTracing();
testCountInstances();
testRuntimeStat();
testRuntimeStats();
}
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);
}
}
}
private static void testMethodTracing() throws Exception {
File tempFile = null;
try {
tempFile = createTempFile();
testMethodTracingToFile(tempFile);
} finally {
if (tempFile != null) {
tempFile.delete();
}
}
}
private static void testMethodTracingToFile(File tempFile) throws Exception {
String tempFileName = tempFile.getPath();
if (VMDebug.getMethodTracingMode() != 0) {
VMDebug.stopMethodTracing();
}
System.out.println("Confirm enable/disable");
System.out.println("status=" + VMDebug.getMethodTracingMode());
VMDebug.startMethodTracing(tempFileName, 0, 0, false, 0);
System.out.println("status=" + VMDebug.getMethodTracingMode());
VMDebug.stopMethodTracing();
System.out.println("status=" + VMDebug.getMethodTracingMode());
if (tempFile.length() == 0) {
System.out.println("ERROR: tracing output file is empty");
}
System.out.println("Confirm sampling");
VMDebug.startMethodTracing(tempFileName, 0, 0, true, 1000);
System.out.println("status=" + VMDebug.getMethodTracingMode());
VMDebug.stopMethodTracing();
System.out.println("status=" + VMDebug.getMethodTracingMode());
if (tempFile.length() == 0) {
System.out.println("ERROR: sample tracing output file is empty");
}
System.out.println("Test starting when already started");
VMDebug.startMethodTracing(tempFileName, 0, 0, false, 0);
System.out.println("status=" + VMDebug.getMethodTracingMode());
VMDebug.startMethodTracing(tempFileName, 0, 0, false, 0);
System.out.println("status=" + VMDebug.getMethodTracingMode());
System.out.println("Test stopping when already stopped");
VMDebug.stopMethodTracing();
System.out.println("status=" + VMDebug.getMethodTracingMode());
VMDebug.stopMethodTracing();
System.out.println("status=" + VMDebug.getMethodTracingMode());
System.out.println("Test tracing with empty filename");
try {
VMDebug.startMethodTracing("", 0, 0, false, 0);
System.out.println("Should have thrown an exception");
} catch (Exception e) {
System.out.println("Got expected exception");
}
System.out.println("Test tracing with bogus (< 1024 && != 0) filesize");
try {
VMDebug.startMethodTracing(tempFileName, 1000, 0, false, 0);
System.out.println("Should have thrown an exception");
} catch (Exception e) {
System.out.println("Got expected exception");
}
System.out.println("Test sampling with bogus (<= 0) interval");
try {
VMDebug.startMethodTracing(tempFileName, 0, 0, true, 0);
System.out.println("Should have thrown an exception");
} catch (Exception e) {
System.out.println("Got expected exception");
}
tempFile.delete();
}
private static void checkNumber(String s) throws Exception {
if (s == null) {
System.out.println("Got null string");
return;
}
long n = Long.parseLong(s);
if (n < 0) {
System.out.println("Got negative number " + n);
}
}
private static void checkHistogram(String s) throws Exception {
if (s == null || s.length() == 0) {
System.out.println("Got null or empty string");
return;
}
String[] buckets = s.split(",");
long last_key = 0;
for (int i = 0; i < buckets.length; ++i) {
String bucket = buckets[i];
if (bucket.length() == 0) {
System.out.println("Got empty bucket");
continue;
}
String[] kv = bucket.split(":");
if (kv.length != 2 || kv[0].length() == 0 || kv[1].length() == 0) {
System.out.println("Got bad bucket " + bucket);
continue;
}
long key = Long.parseLong(kv[0]);
long value = Long.parseLong(kv[1]);
if (key < 0 || value < 0) {
System.out.println("Got negative key or value " + bucket);
continue;
}
if (key < last_key) {
System.out.println("Got decreasing key " + bucket);
continue;
}
last_key = key;
}
}
private static void testRuntimeStat() throws Exception {
// Invoke at least one GC and wait for 20 seconds or so so we get at
// least one bucket in the histograms.
for (int i = 0; i < 20; ++i) {
Runtime.getRuntime().gc();
Thread.sleep(1000L);
}
String gc_count = VMDebug.getRuntimeStat("art.gc.gc-count");
String gc_time = VMDebug.getRuntimeStat("art.gc.gc-time");
String bytes_allocated = VMDebug.getRuntimeStat("art.gc.bytes-allocated");
String bytes_freed = VMDebug.getRuntimeStat("art.gc.bytes-freed");
String blocking_gc_count = VMDebug.getRuntimeStat("art.gc.blocking-gc-count");
String blocking_gc_time = VMDebug.getRuntimeStat("art.gc.blocking-gc-time");
String gc_count_rate_histogram = VMDebug.getRuntimeStat("art.gc.gc-count-rate-histogram");
String blocking_gc_count_rate_histogram =
VMDebug.getRuntimeStat("art.gc.blocking-gc-count-rate-histogram");
checkNumber(gc_count);
checkNumber(gc_time);
checkNumber(bytes_allocated);
checkNumber(bytes_freed);
checkNumber(blocking_gc_count);
checkNumber(blocking_gc_time);
checkHistogram(gc_count_rate_histogram);
checkHistogram(blocking_gc_count_rate_histogram);
}
private static void testRuntimeStats() throws Exception {
// Invoke at least one GC and wait for 20 seconds or so so we get at
// least one bucket in the histograms.
for (int i = 0; i < 20; ++i) {
Runtime.getRuntime().gc();
Thread.sleep(1000L);
}
Map<String, String> map = VMDebug.getRuntimeStats();
String gc_count = map.get("art.gc.gc-count");
String gc_time = map.get("art.gc.gc-time");
String bytes_allocated = map.get("art.gc.bytes-allocated");
String bytes_freed = map.get("art.gc.bytes-freed");
String blocking_gc_count = map.get("art.gc.blocking-gc-count");
String blocking_gc_time = map.get("art.gc.blocking-gc-time");
String gc_count_rate_histogram = map.get("art.gc.gc-count-rate-histogram");
String blocking_gc_count_rate_histogram =
map.get("art.gc.blocking-gc-count-rate-histogram");
checkNumber(gc_count);
checkNumber(gc_time);
checkNumber(bytes_allocated);
checkNumber(bytes_freed);
checkNumber(blocking_gc_count);
checkNumber(blocking_gc_time);
checkHistogram(gc_count_rate_histogram);
checkHistogram(blocking_gc_count_rate_histogram);
}
static class ClassA { }
static class ClassB { }
static class ClassC extends ClassA { }
private static void testCountInstances() throws Exception {
ArrayList<Object> l = new ArrayList<Object>();
l.add(new ClassA());
l.add(new ClassB());
l.add(new ClassA());
l.add(new ClassC());
Runtime.getRuntime().gc();
System.out.println("Instances of ClassA " +
VMDebug.countInstancesofClass(ClassA.class, false));
System.out.println("Instances of ClassB " +
VMDebug.countInstancesofClass(ClassB.class, false));
System.out.println("Instances of null " + VMDebug.countInstancesofClass(null, false));
System.out.println("Instances of ClassA assignable " +
VMDebug.countInstancesofClass(ClassA.class, true));
Class<?>[] classes = new Class<?>[] {ClassA.class, ClassB.class, null};
long[] counts = VMDebug.countInstancesofClasses(classes, false);
System.out.println("Array counts " + Arrays.toString(counts));
counts = VMDebug.countInstancesofClasses(classes, true);
System.out.println("Array counts assignable " + Arrays.toString(counts));
}
private static class VMDebug {
private static final Method startMethodTracingMethod;
private static final Method stopMethodTracingMethod;
private static final Method getMethodTracingModeMethod;
private static final Method getRuntimeStatMethod;
private static final Method getRuntimeStatsMethod;
private static final Method countInstancesOfClassMethod;
private static final Method countInstancesOfClassesMethod;
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");
getRuntimeStatMethod = c.getDeclaredMethod("getRuntimeStat", String.class);
getRuntimeStatsMethod = c.getDeclaredMethod("getRuntimeStats");
countInstancesOfClassMethod = c.getDeclaredMethod("countInstancesOfClass",
Class.class, Boolean.TYPE);
countInstancesOfClassesMethod = c.getDeclaredMethod("countInstancesOfClasses",
Class[].class, Boolean.TYPE);
} 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);
}
public static String getRuntimeStat(String statName) throws Exception {
return (String) getRuntimeStatMethod.invoke(null, statName);
}
public static Map<String, String> getRuntimeStats() throws Exception {
return (Map<String, String>) getRuntimeStatsMethod.invoke(null);
}
public static long countInstancesofClass(Class<?> c, boolean assignable) throws Exception {
return (long) countInstancesOfClassMethod.invoke(null, new Object[]{c, assignable});
}
public static long[] countInstancesofClasses(Class<?>[] classes, boolean assignable)
throws Exception {
return (long[]) countInstancesOfClassesMethod.invoke(
null, new Object[]{classes, assignable});
}
}
}