test/hotspot/jtreg/runtime/appcds/javaldr/GCSharedStringsDuringDumpWb.java

/*
 * Copyright (c) 2017, 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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import sun.hotspot.WhiteBox;

public class GCSharedStringsDuringDumpWb {
    public static void main(String[] args) throws Exception {
        WhiteBox wb = WhiteBox.getWhiteBox();
        String s = "shared_test_string_unique_14325";
        s = s.intern();
        CheckString(wb, s);
        for (int i=0; i<100000; i++) {
            s = "generated_string " + i;
            s = s.intern();
            CheckString(wb, s);
        }
    }

    public static void CheckString(WhiteBox wb, String s) {
        if (!wb.areSharedStringsIgnored() && !wb.isShared(s)) {
            throw new RuntimeException("String is not shared.");
        }
    }
}