| /* |
| * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test WBStackSize |
| * @summary verify that whitebox functions getThreadFullStackSize() and getThreadRemainingStackSize are working |
| * @modules java.base/jdk.internal.misc |
| * @library /test/lib |
| * @build sun.hotspot.WhiteBox |
| * @run main ClassFileInstaller sun.hotspot.WhiteBox |
| * sun.hotspot.WhiteBox$WhiteBoxPermission |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k WBStackSize |
| */ |
| |
| /* |
| * The test may product a false failure if too big StackYellowPages/StackRedPages/ShackShadowPages |
| * VM options are specified. The proper test would retrieve the page size from VM and account for these options |
| * instead of check below: |
| * Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1 |
| * |
| * Please file a test bug, if this is a problem. |
| */ |
| |
| import sun.hotspot.WhiteBox; |
| |
| public class WBStackSize { |
| |
| static final long K = 1024; |
| |
| static final long MIN_STACK_SIZE = 8 * K; |
| static final long MAX_STACK_SIZE_ALLOCATED_IN_MAIN = 150 * K; // current value is about 130k on 64-bit platforms |
| |
| static final WhiteBox wb = WhiteBox.getWhiteBox(); |
| |
| static long stackSizeOnOverflow = -1; |
| |
| static int eatAllStack() { |
| return eatAllStack() * 2; |
| } |
| |
| static void testStackOverflow() { |
| |
| stackSizeOnOverflow = wb.getThreadRemainingStackSize(); |
| |
| if (stackSizeOnOverflow > MIN_STACK_SIZE) { |
| |
| try { |
| testStackOverflow(); |
| } catch (StackOverflowError e) { |
| // We caught SOE too early. The error will be reported in main() |
| } |
| |
| } else { |
| |
| try { |
| eatAllStack(); |
| throw new RuntimeException("Haven't caught StackOverflowError at all"); |
| } catch (StackOverflowError e) { |
| // OK: we caught the anticipated error |
| } |
| } |
| } |
| |
| public static void main(String[] args) { |
| long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K; |
| System.out.println("ThreadStackSize VM option: " + configStackSize); |
| |
| long stackProtectionSize = wb.getIntxVMFlag("StackShadowPages") * wb.getVMPageSize(); |
| System.out.println("Size of protected shadow pages: " + stackProtectionSize); |
| |
| long actualStackSize = wb.getThreadStackSize(); |
| System.out.println("Full stack size: " + actualStackSize); |
| |
| if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) { |
| throw new RuntimeException("getThreadFullStackSize value [" + actualStackSize |
| + "] should be within 90%..110% of the value returned by HotSpotDiagnosticMXBean"); |
| } |
| |
| long remainingStackSize = wb.getThreadRemainingStackSize(); |
| System.out.println("Remaining stack size in main(): " + remainingStackSize); |
| |
| // Up to 150k can be already allocated by VM and some space is used for stack protection. |
| long spaceAlreadyOccupied = MAX_STACK_SIZE_ALLOCATED_IN_MAIN + stackProtectionSize; |
| |
| if (remainingStackSize > configStackSize |
| || (configStackSize > spaceAlreadyOccupied |
| && remainingStackSize < configStackSize - spaceAlreadyOccupied)) { |
| |
| throw new RuntimeException("getThreadRemainingStackSize value [" + remainingStackSize |
| + "] should be at least ThreadStackSize value [" + configStackSize + "] minus [" |
| + spaceAlreadyOccupied + "]"); |
| } |
| |
| testStackOverflow(); |
| |
| if (stackSizeOnOverflow > MIN_STACK_SIZE) { |
| throw new RuntimeException("Caught StackOverflowError too early: when there were " |
| + stackSizeOnOverflow + " bytes in stack"); |
| } else if (stackSizeOnOverflow < 0) { |
| throw new RuntimeException("Internal test error: stackRemainingSize < 0"); |
| } else { |
| System.out.println("Caught StackOverflowError as expected"); |
| } |
| } |
| } |