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 /../../test/lib 28 * @build WBStackSize 29 * @run main ClassFileInstaller sun.hotspot.WhiteBox 30 * sun.hotspot.WhiteBox$WhiteBoxPermission 31 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k WBStackSize 32 */ 33 34 /* 35 * The test may product a false failure if too big StackYellowPages/StackRedPages/ShackShadowPages 36 * VM options are specified. The proper test would retrieve the page size from VM and account for these options 37 * instead of check below: 38 * Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1 39 * 40 * Please file a test bug, if this is a problem. 41 */ 42 43 import sun.hotspot.WhiteBox; 44 45 public class WBStackSize { 46 47 static final long K = 1024; 48 49 static final long MIN_STACK_SIZE = 8 * K; 50 static final long MAX_STACK_SIZE_ALLOCATED_IN_MAIN = 200 * K; // current value is about 130k on 64-bit platforms 51 52 static final WhiteBox wb = WhiteBox.getWhiteBox(); 53 54 static long stackSizeOnOverflow = -1; 55 56 static int eatAllStack() { 57 return eatAllStack() * 2; 58 } 59 60 static void testStackOverflow() { 61 62 stackSizeOnOverflow = wb.getThreadRemainingStackSize(); 63 64 if (stackSizeOnOverflow > MIN_STACK_SIZE) { 65 66 try { 67 testStackOverflow(); 68 } catch (StackOverflowError e) { 69 // We caught SOE too early. The error will be reported in main() 70 } 71 72 } else { 73 74 try { 75 eatAllStack(); 76 throw new RuntimeException("Haven't caught StackOverflowError at all"); 77 } catch (StackOverflowError e) { 78 // OK: we caught the anticipated error 79 } 80 } 81 } 82 83 public static void main(String[] args) { 84 long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K; 85 86 System.out.println("ThreadStackSize VM option: " + configStackSize); 87 88 long actualStackSize = wb.getThreadStackSize(); 89 System.out.println("Full stack size: " + actualStackSize); 90 91 if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) { 92 throw new RuntimeException("getThreadFullStackSize value [" + actualStackSize 93 + "] should be within 90%..110% of the value returned by HotSpotDiagnosticMXBean"); 94 } 95 96 long remainingStackSize = wb.getThreadRemainingStackSize(); 97 System.out.println("Remaining stack size in main(): " + remainingStackSize); 98 99 // Up to 200k can be already allocated by VM 100 if (remainingStackSize > configStackSize 101 || (configStackSize > MAX_STACK_SIZE_ALLOCATED_IN_MAIN 102 && remainingStackSize < configStackSize - MAX_STACK_SIZE_ALLOCATED_IN_MAIN)) { 103 104 throw new RuntimeException("getThreadRemainingStackSize value [" + remainingStackSize 105 + "] should be at least ThreadStackSize value [" + configStackSize + "] minus [" 106 + MAX_STACK_SIZE_ALLOCATED_IN_MAIN + "]"); 107 } 108 109 testStackOverflow(); 110 111 if (stackSizeOnOverflow > MIN_STACK_SIZE) { 112 throw new RuntimeException("Caught StackOverflowError too early: when there were " 113 + stackSizeOnOverflow + " bytes in stack"); 114 } else if (stackSizeOnOverflow < 0) { 115 throw new RuntimeException("Internal test error: stackRemainingSize < 0"); 116 } else { 117 System.out.println("Caught StackOverflowError as expected"); 118 } 119 } 120 }