/*
 * Copyright (c) 2014, 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.
 *
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 */

/*
 * @test WBStackSize
 * @summary verify that whitebox functions getThreadFullStackSize() and getThreadRemainingStackSize are working
 * @library /testlibrary /testlibrary/whitebox
 * @build WBStackSize
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xss512k WBStackSize
 */

import com.sun.management.HotSpotDiagnosticMXBean;
import sun.hotspot.WhiteBox;

public class WBStackSize {

    static WhiteBox wb = WhiteBox.getWhiteBox();

    static class SOE extends RuntimeException {
        long rss;
        SOE(long rss) { this.rss = rss; }
    }

    static void recursive(long n) {
        try {
            recursive(n + 1);
        } catch ( StackOverflowError e ) {
            throw new SOE(wb.getThreadRemainingStackSize());
        }
    }

    public static void main(String... args) {
        HotSpotDiagnosticMXBean bean = sun.management.ManagementFactoryHelper.getDiagnosticMXBean();
        long sso = Long.valueOf(bean.getVMOption("ThreadStackSize").getValue()) * 1024;

        System.out.println("ThreadStackSize VM option = " + sso);

        long fss = wb.getThreadFullStackSize();
        long rss = wb.getThreadRemainingStackSize();

        System.out.print("Full stack size " + fss + ": ");

        // Test has -Xss512k option
        if ( fss < sso * 0.8 || fss > sso * 1.2 ) {
            throw new RuntimeException("getThreadFullStackSize value [" + fss + "] should be within 80%..120% of the value returned by HotSpotDiagnosticMXBean");
        } else {
            System.out.println("OK");
        }

        System.out.print("Remaining stack size " + rss + ": ");
        if ( fss < sso * 0.8 || fss > sso * 1.2 ) {
            throw new RuntimeException("getThreadRemainingStackSize value [" + fss + "] should be within 80%..120% of the value returned by HotSpotDiagnosticMXBean");
        } else {
            System.out.println("OK");
        }

        try {
            recursive(0);
        } catch ( SOE e ) {
            System.out.print("Remaining stack size on stack overflow " + e.rss + ": ");
            if ( e.rss > 8 * 1024 ) {
                throw new RuntimeException("Remaining stack size when StackOverflowError is caught should be at least 8K");
            } else {
                System.out.print("OK");
            }
        }
    }
}