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/*
* Copyright (c) 2014, 2018, 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 driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
* @comment Must use the same stacksize for Java threads and compiler threads in case of thread recycling
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k -XX:CompilerThreadStackSize=512 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;
import jdk.test.lib.Platform;
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 pageSize = wb.getVMPageSize();
long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K;
System.out.println("ThreadStackSize VM option: " + configStackSize);
long stackProtectionSize = wb.getIntxVMFlag("StackShadowPages") * pageSize;
System.out.println("Size of protected shadow pages: " + stackProtectionSize);
long actualStackSize = wb.getThreadStackSize();
System.out.println("Full stack size: " + actualStackSize);
if (!Platform.isAix()) {
if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) {
throw new RuntimeException("getThreadStackSize value [" + actualStackSize
+ "] should be within 90%..110% of ThreadStackSize value");
}
} else {
// AIX pthread implementation returns stacks with sizes varying a lot.
// We add +64K to assure stacks are not too small, thus we get
// even more variation to bigger sizes. So only check the lower bound.
// Allow for at least one page deviation.
long slack = (long)(configStackSize * 0.1);
if (slack < pageSize) {
if (configStackSize - actualStackSize > pageSize) {
throw new RuntimeException("getThreadStackSize value [" + actualStackSize
+ "] should not be more than one page smaller than "
+ "ThreadStackSize value");
}
} else {
if (configStackSize - actualStackSize > slack) {
throw new RuntimeException("getThreadStackSize value [" + actualStackSize
+ "] should not be less than 90% of ThreadStackSize value");
}
}
}
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");
}
}
}
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