StackOverflow.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * 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).
 *
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 * 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
 * @bug 7116216
 * @summary The vm crashes when GC happens during throwing a StackOverflow exception
 *
 * @run main/othervm -Xcomp -Xbatch StackOverflow
 */

class StackOverflow {
    static String stackOverflow_largeFrame_liveOopForGC;

    public static int stackOverflow_largeFrame(int call_count, String liveOopForGC) {
        try {
            int return_count = stackOverflow_largeFrame(++call_count, liveOopForGC);
            if (return_count == 0) {
                try {
                    LargeFrame.method_with_many_locals(liveOopForGC, 2,3,4,5,6,7,liveOopForGC);
                } catch (StackOverflowError e2) {
                    // access liveOopForGC to make it a live variable
                    stackOverflow_largeFrame_liveOopForGC = liveOopForGC;
                }
            }
            return return_count - 1;
        } catch (StackOverflowError e) {
            // Return a value that is large enough such that no unrecoverable
            // stack overflow will occur afterwards, but that is small enough
            // such that calling LargeFrame.method_with_many_locals() will
            // cause a StackOverflowError.
            // Don't use a call here because we're out of stack space anyway!
            int tmp = call_count / 2;
            return (tmp < 100 ? tmp : 100);
        }
    }
    public static void main(String args[]) {
        LargeFrame.method_with_many_locals(new Object(), 2,3,4,5,6,7,new Object());

        stackOverflow_largeFrame(0, "this is a live oop to test GC");
        System.out.println("finished ok!");
    }
}