/* * Copyright (c) 2014, 2022, 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.
*/
/* * The primary purpose of this test is to make sure we can run with a 16k stack * size without crashing. Also this test will determine the minimum allowed * stack size for the platform (as provided by the JVM error message when a very * small stack is used), and then verify that the JVM can be launched with that stack * size without a crash or any error messages. * * Note: The '-Xss<size>' and '-XX:ThreadStackSize=<k-bytes>' options * both control Java thread stack size. This repo's version of the test * exercises the '-Xss' option. The hotspot repo's version of the test * exercises the '-XX:ThreadStackSize' VM option.
*/
staticvoid printTestOutput(TestResult tr) {
System.out.println("*** exitValue = " + tr.exitValue); for (String x : tr.testOutput) {
System.out.println(x);
}
}
/* * Returns the minimum stack size this platform will allowed based on the * contents of the error message the JVM outputs when too small of a * -Xss size was used. * * The TestResult argument must contain the result of having already run * the JVM with too small of a stack size.
*/ static String getMinStackAllowed(TestResult tr) { /* * The JVM output will contain in one of the lines: * "The Java thread stack size specified is too small. Specify at least 100k" * Although the actual size will vary. We need to extract this size * string from the output and return it.
*/
String matchStr = "Specify at least "; for (String x : tr.testOutput) { int match_idx = x.indexOf(matchStr); if (match_idx >= 0) { int size_start_idx = match_idx + matchStr.length(); int k_start_idx = x.indexOf("k", size_start_idx); return x.substring(size_start_idx, k_start_idx + 1); // include the "k"
}
}
System.out.println("Expect='" + matchStr + "'");
System.out.println("Actual:");
printTestOutput(tr);
System.out.println("FAILED: Could not get the stack size from the output"); thrownew RuntimeException("test fails");
}
/* * Run the JVM with the specified stack size. * * Returns the minimum allowed stack size gleaned from the error message, * if there is an error message. Otherwise returns the stack size passed in.
*/ static String checkStack(String stackSize) {
String min_stack_allowed;
if (verbose)
System.out.println("*** Testing " + stackSize);
TestResult tr = doExec(javaCmd, "-Xss" + stackSize, "-version"); if (verbose)
printTestOutput(tr);
if (tr.isOK()) {
System.out.println("PASSED: got no error message with stack size of " + stackSize);
min_stack_allowed = stackSize;
} else {
String matchStr = "The Java thread stack size specified is too small"; if (tr.contains(matchStr)) {
System.out.println("PASSED: got expected error message with stack size of " + stackSize);
min_stack_allowed = getMinStackAllowed(tr);
} else { // Likely a crash
System.out.println("Expect='" + matchStr + "'");
System.out.println("Actual:");
printTestOutput(tr);
System.out.println("FAILED: Did not get expected error message with stack size of " + stackSize); thrownew RuntimeException("test fails");
}
}
return min_stack_allowed;
}
/* * Run the JVM with the minimum allowed stack size. This should always succeed.
*/ staticvoid checkMinStackAllowed(String stackSize) { if (verbose)
System.out.println("*** Testing " + stackSize);
TestResult tr = doExec(javaCmd, "-Xss" + stackSize, "-version"); if (verbose)
printTestOutput(tr);
if (tr.isOK()) {
System.out.println("PASSED: VM launched with minimum allowed stack size of " + stackSize);
} else { // Likely a crash
System.out.println("Test output:");
printTestOutput(tr);
System.out.println("FAILED: VM failed to launch with minimum allowed stack size of " + stackSize); thrownew RuntimeException("test fails");
}
}
publicstaticvoid main(String... args) { /* * The result of a 16k stack size should be a quick exit with a complaint * that the stack size is too small. However, for some win32 builds, the * stack is always at least 64k, and this also sometimes is the minimum * allowed size, so we won't see an error in this case. * * This test case will also produce a crash on some platforms if the fix * for 6762191 is not yet in place.
*/
checkStack("16k");
/* * Try with a 64k stack size, which is the size that the launcher will * set to if you try setting to anything smaller. This should produce the same * result as setting to 16k if the fix for 6762191 is in place.
*/
String min_stack_allowed = checkStack("64k");
/* * Try again with the minimum stack size that was given in the error message
*/
checkMinStackAllowed(min_stack_allowed);
/* * Try again with a size that is not OS page aligned. This is to help test that * asserts added for 8176768 are not triggered.
*/
checkMinStackAllowed("513k");
/* * Try with 0k which indicates that the default thread stack size either from JVM or system * will be used, this should always succeed.
*/
checkMinStackAllowed("0k");
}
}
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