1 /* 2 * Copyright (c) 2014, Oracle 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 /* 25 * @test WBStackSize 26 * @summary verify that whitebox functions getThreadFullStackSize() and getThreadRemainingStackSize are working 27 * @library /testlibrary /testlibrary/whitebox 28 * @build WBStackSize 29 * @run main ClassFileInstaller sun.hotspot.WhiteBox 30 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k WBStackSize 31 */ 32 33 import com.sun.management.HotSpotDiagnosticMXBean; 34 import sun.hotspot.WhiteBox; 35 36 public class WBStackSize { 37 38 static final long K = 1024; 39 40 static final long MIN_STACK_SIZE = 8 * K; 41 static final long MAX_STACK_SIZE_ALLOCATED_IN_MAIN = 200 * K; // current value is about 130k on 64-bit platforms 42 43 static final WhiteBox wb = WhiteBox.getWhiteBox(); 44 45 static long stackSizeOnOverflow = -1; 46 47 static int eatAllStack() { 48 return eatAllStack() * 2; 49 } 50 51 static void testStackOverflow() { 52 53 stackSizeOnOverflow = wb.getThreadRemainingStackSize(); 54 55 if (stackSizeOnOverflow > MIN_STACK_SIZE) { 56 57 try { 58 testStackOverflow(); 59 } catch (StackOverflowError e) { 60 // We caught SOE too early. The error will be reported in main() 61 } 62 63 } else { 64 65 try { 66 eatAllStack(); 67 throw new RuntimeException("Haven't caught StackOverflowError at all"); 68 } catch (StackOverflowError e) { 69 // OK: we caught the anticipated error 70 } 71 } 72 } 73 74 public static void main(String[] args) { 75 HotSpotDiagnosticMXBean bean = sun.management.ManagementFactoryHelper.getDiagnosticMXBean(); 76 long configStackSize = Long.valueOf(bean.getVMOption("ThreadStackSize").getValue()) * K; 77 78 System.out.println("ThreadStackSize VM option: " + configStackSize); 79 80 long actualStackSize = wb.getThreadFullStackSize(); 81 System.out.println("Full stack size: " + actualStackSize); 82 83 if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) { 84 throw new RuntimeException("getThreadFullStackSize value [" + actualStackSize 85 + "] should be within 90%..110% of the value returned by HotSpotDiagnosticMXBean"); 86 } 87 88 long remainingStackSize = wb.getThreadRemainingStackSize(); 89 System.out.println("Remaining stack size in main(): " + remainingStackSize); 90 91 // Up to 200k can be already allocated by VM 92 if (remainingStackSize > configStackSize 93 || (configStackSize > MAX_STACK_SIZE_ALLOCATED_IN_MAIN 94 && remainingStackSize < configStackSize - MAX_STACK_SIZE_ALLOCATED_IN_MAIN)) { 95 96 throw new RuntimeException("getThreadRemainingStackSize value [" + remainingStackSize 97 + "] should be at least ThreadStackSize value [" + configStackSize + "] minus [" 98 + MAX_STACK_SIZE_ALLOCATED_IN_MAIN + "]"); 99 } 100 101 testStackOverflow(); 102 103 if (stackSizeOnOverflow > MIN_STACK_SIZE) { 104 throw new RuntimeException("Caught StackOverflowError too early: when there were " 105 + stackSizeOnOverflow + " bytes in stack"); 106 } else if (stackSizeOnOverflow < 0) { 107 throw new RuntimeException("Internal test error: stackRemainingSize < 0"); 108 } else { 109 System.out.println("Caught StackOverflowError as expected"); 110 } 111 } 112 }