view test/compiler/6855164/Test.java @ 1359:23b1b27ac76c

6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.") Summary: Make sure that two marking cycles do not overlap, i.e., a new one can only start after the concurrent marking thread finishes all its work. In the fix I piggy-back a couple of minor extra fixes: some general code reformatting for consistency (only around the code I modified), the removal of a field (G1CollectorPolicy::_should_initiate_conc_mark) which doesn't seem to be used at all (it's only set but never read), as well as moving the "is GC locker active" test earlier into the G1 pause / Full GC and using a more appropriate method for it. Reviewed-by: johnc, jmasa, jcoomes, ysr
author tonyp
date Tue, 06 Apr 2010 10:59:45 -0400
parents 73dac61fe300
children c18cbe5936b8
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/*
 * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test
 * @bug 6855164
 * @summary SIGSEGV during compilation of method involving loop over CharSequence
 * @run main/othervm -Xbatch Test
 */

public class Test{
    public static void main(String[] args) throws Exception {
        StringBuffer builder = new StringBuffer();

        for(int i = 0; i < 100; i++)
            builder.append("I am the very model of a modern major general\n");

        for(int j = 0; j < builder.length(); j++){
            previousSpaceIndex(builder, j);
        }
    }

    private static final int previousSpaceIndex(CharSequence sb, int seek) {
        seek--;
        while (seek > 0) {
            if (sb.charAt(seek) == ' ') {
                while (seek > 0 && sb.charAt(seek - 1) == ' ')
                    seek--;
                return seek;
            }
            seek--;
        }
        return 0;
    }
}