1 /* 2 * Copyright (c) 2017, Google and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package MyPackage; 25 26 /** 27 * @test 28 * @summary Verifies if turning on/off/on the monitor wipes out the information. 29 * @build Frame 30 * @compile HeapMonitorOnOffTest.java 31 * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorOnOffTest 32 */ 33 34 import java.io.PrintStream; 35 36 public class HeapMonitorOnOffTest { 37 38 static { 39 try { 40 System.loadLibrary("HeapMonitor"); 41 } catch (UnsatisfiedLinkError ule) { 42 System.err.println("Could not load HeapMonitor library"); 43 System.err.println("java.library.path: " 44 + System.getProperty("java.library.path")); 45 throw ule; 46 } 47 } 48 49 public static int helper() { 50 int sum = 0; 51 // Let us assume that the array is 24 bytes of memory. 52 for (int i = 0; i < 127000 / 6; i++) { 53 int tmp[] = new int[1]; 54 // Force it to be kept. 55 g_tmp = tmp; 56 sum += g_tmp[0]; 57 } 58 return sum; 59 } 60 61 public static void wrapper() { 62 int sum = 0; 63 for (int j = 0; j < 1000; j++) { 64 sum += helper(); 65 } 66 System.out.println(sum); 67 } 68 69 native static int checkFrames(Frame[] frames); 70 native static int checkWipeOut(Frame[] frames); 71 native static int enableSampling(); 72 native static int disableSampling(); 73 74 public static int cnt; 75 public static int g_tmp[]; 76 public int array[]; 77 78 public static void main(String[] args) { 79 Frame[] frames = new Frame[3]; 80 frames[0] = new Frame("helper", "()I", "HeapMonitorOnOffTest.java", 53); 81 frames[1] = new Frame("wrapper", "()V", "HeapMonitorOnOffTest.java", 64); 82 frames[2] = new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorOnOffTest.java", 86); 83 84 // Enable sampling and allocate. 85 enableSampling(); 86 wrapper(); 87 88 // Now disable and re-enable. 89 disableSampling(); 90 91 // Check that the data is still there: this allows to peruse samples after profiling. 92 int status = checkFrames(frames); 93 if (status != 0) { 94 throw new RuntimeException("Failed to find the traces before the wipe out."); 95 } 96 97 // Enabling the sampling should wipe everything out. 98 enableSampling(); 99 100 status = checkWipeOut(frames); 101 if (status != 0) { 102 throw new RuntimeException("Failed to wipe out the information."); 103 } 104 } 105 }