1 /* 2 * Copyright (c) 2014, 2016, 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 * @modules java.base/jdk.internal.misc 28 * @library /test/lib 29 * @build sun.hotspot.WhiteBox 30 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 31 * sun.hotspot.WhiteBox$WhiteBoxPermission 32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k WBStackSize 33 */ 34 35 /* 36 * The test may product a false failure if too big StackYellowPages/StackRedPages/ShackShadowPages 37 * VM options are specified. The proper test would retrieve the page size from VM and account for these options 38 * instead of check below: 39 * Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1 40 * 41 * Please file a test bug, if this is a problem. 42 */ 43 44 import sun.hotspot.WhiteBox; 45 46 public class WBStackSize { 47 48 static final long K = 1024; 49 50 static final long MIN_STACK_SIZE = 8 * K; 51 static final long MAX_STACK_SIZE_ALLOCATED_IN_MAIN = 150 * K; // current value is about 130k on 64-bit platforms 52 53 static final WhiteBox wb = WhiteBox.getWhiteBox(); 54 55 static long stackSizeOnOverflow = -1; 56 57 static int eatAllStack() { 58 return eatAllStack() * 2; 59 } 60 61 static void testStackOverflow() { 62 63 stackSizeOnOverflow = wb.getThreadRemainingStackSize(); 64 65 if (stackSizeOnOverflow > MIN_STACK_SIZE) { 66 67 try { 68 testStackOverflow(); 69 } catch (StackOverflowError e) { 70 // We caught SOE too early. The error will be reported in main() 71 } 72 73 } else { 74 75 try { 76 eatAllStack(); 77 throw new RuntimeException("Haven't caught StackOverflowError at all"); 78 } catch (StackOverflowError e) { 79 // OK: we caught the anticipated error 80 } 81 } 82 } 83 84 public static void main(String[] args) { 85 long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K; 86 System.out.println("ThreadStackSize VM option: " + configStackSize); 87 88 long stackProtectionSize = wb.getIntxVMFlag("StackShadowPages") * wb.getVMPageSize(); 89 System.out.println("Size of protected shadow pages: " + stackProtectionSize); 90 91 long actualStackSize = wb.getThreadStackSize(); 92 System.out.println("Full stack size: " + actualStackSize); 93 94 if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) { 95 throw new RuntimeException("getThreadFullStackSize value [" + actualStackSize 96 + "] should be within 90%..110% of the value returned by HotSpotDiagnosticMXBean"); 97 } 98 99 long remainingStackSize = wb.getThreadRemainingStackSize(); 100 System.out.println("Remaining stack size in main(): " + remainingStackSize); 101 102 // Up to 150k can be already allocated by VM and some space is used for stack protection. 103 long spaceAlreadyOccupied = MAX_STACK_SIZE_ALLOCATED_IN_MAIN + stackProtectionSize; 104 105 if (remainingStackSize > configStackSize 106 || (configStackSize > spaceAlreadyOccupied 107 && remainingStackSize < configStackSize - spaceAlreadyOccupied)) { 108 109 throw new RuntimeException("getThreadRemainingStackSize value [" + remainingStackSize 110 + "] should be at least ThreadStackSize value [" + configStackSize + "] minus [" 111 + spaceAlreadyOccupied + "]"); 112 } 113 114 testStackOverflow(); 115 116 if (stackSizeOnOverflow > MIN_STACK_SIZE) { 117 throw new RuntimeException("Caught StackOverflowError too early: when there were " 118 + stackSizeOnOverflow + " bytes in stack"); 119 } else if (stackSizeOnOverflow < 0) { 120 throw new RuntimeException("Internal test error: stackRemainingSize < 0"); 121 } else { 122 System.out.println("Caught StackOverflowError as expected"); 123 } 124 } 125 }