1 /* 2 * Copyright (c) 2014, 2018, 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 * @comment Must use the same stacksize for Java threads and compiler threads in case of thread recycling 33 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k -XX:CompilerThreadStackSize=512 WBStackSize 34 */ 35 36 /* 37 * The test may product a false failure if too big StackYellowPages/StackRedPages/ShackShadowPages 38 * VM options are specified. The proper test would retrieve the page size from VM and account for these options 39 * instead of check below: 40 * Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1 41 * 42 * Please file a test bug, if this is a problem. 43 */ 44 45 import sun.hotspot.WhiteBox; 46 47 public class WBStackSize { 48 49 static final long K = 1024; 50 51 static final long MIN_STACK_SIZE = 8 * K; 52 static final long MAX_STACK_SIZE_ALLOCATED_IN_MAIN = 150 * K; // current value is about 130k on 64-bit platforms 53 54 static final WhiteBox wb = WhiteBox.getWhiteBox(); 55 56 static long stackSizeOnOverflow = -1; 57 58 static int eatAllStack() { 59 return eatAllStack() * 2; 60 } 61 62 static void testStackOverflow() { 63 64 stackSizeOnOverflow = wb.getThreadRemainingStackSize(); 65 66 if (stackSizeOnOverflow > MIN_STACK_SIZE) { 67 68 try { 69 testStackOverflow(); 70 } catch (StackOverflowError e) { 71 // We caught SOE too early. The error will be reported in main() 72 } 73 74 } else { 75 76 try { 77 eatAllStack(); 78 throw new RuntimeException("Haven't caught StackOverflowError at all"); 79 } catch (StackOverflowError e) { 80 // OK: we caught the anticipated error 81 } 82 } 83 } 84 85 public static void main(String[] args) { 86 long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K; 87 System.out.println("ThreadStackSize VM option: " + configStackSize); 88 89 long stackProtectionSize = wb.getIntxVMFlag("StackShadowPages") * wb.getVMPageSize(); 90 System.out.println("Size of protected shadow pages: " + stackProtectionSize); 91 92 long actualStackSize = wb.getThreadStackSize(); 93 System.out.println("Full stack size: " + actualStackSize); 94 95 if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) { 96 throw new RuntimeException("getThreadFullStackSize value [" + actualStackSize 97 + "] should be within 90%..110% of ThreadStackSize value"); 98 } 99 100 long remainingStackSize = wb.getThreadRemainingStackSize(); 101 System.out.println("Remaining stack size in main(): " + remainingStackSize); 102 103 // Up to 150k can be already allocated by VM and some space is used for stack protection. 104 long spaceAlreadyOccupied = MAX_STACK_SIZE_ALLOCATED_IN_MAIN + stackProtectionSize; 105 106 if (remainingStackSize > configStackSize 107 || (configStackSize > spaceAlreadyOccupied 108 && remainingStackSize < configStackSize - spaceAlreadyOccupied)) { 109 110 throw new RuntimeException("getThreadRemainingStackSize value [" + remainingStackSize 111 + "] should be at least ThreadStackSize value [" + configStackSize + "] minus [" 112 + spaceAlreadyOccupied + "]"); 113 } 114 115 testStackOverflow(); 116 117 if (stackSizeOnOverflow > MIN_STACK_SIZE) { 118 throw new RuntimeException("Caught StackOverflowError too early: when there were " 119 + stackSizeOnOverflow + " bytes in stack"); 120 } else if (stackSizeOnOverflow < 0) { 121 throw new RuntimeException("Internal test error: stackRemainingSize < 0"); 122 } else { 123 System.out.println("Caught StackOverflowError as expected"); 124 } 125 } 126 }