jdk/test/hotspot/jtreg/compiler/loopopts/TestStressLongCountedLoopInfiniteLoop.java

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/*
 * @test
 * @bug 8378005
 * @summary assert in proj_out when StressLongCountedLoop converts infinite loop to long counted loop nest
 * @run main ${test.main.class}
 * @run main/othervm -Xbatch -XX:-TieredCompilation -XX:+IgnoreUnrecognizedVMOptions -XX:StressLongCountedLoop=1
 *                   -XX:CompileCommand=compileonly,${test.main.class}::test ${test.main.class}
 */

package compiler.loopopts;

public class TestStressLongCountedLoopInfiniteLoop {
    static int RANGE;

    public static void main(String[] args) {
        int[] a = new int[RANGE];
        for (int i = 0; i < 10000; i++) {
            try {
                test(a, 0);
            } catch (ArrayIndexOutOfBoundsException e) {
            }
        }
    }

    static void test(int[] a, int invar) {
        // new Integer(0) works too, using MyInteger to avoid deprecation warnings.
        a[new MyInteger(0).v()] = 0;

        Object o;
        for (int i = 0; i < 1; i++) {
            o = 1;
        }

        // Infinite loop: j is always 0, 0 < 1 is always true.
        for (int j = 0; Integer.valueOf(j) < 1;) {
            j = 0;
        }
    }

    static class MyInteger {
        int v;

        MyInteger(int v) {
            this.v = v;
        }

        int v() {
            return Integer.valueOf(v);
        }
    }
}