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

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/*
 * @test
 * @bug 8378005
 * @summary Verify that an infinite loop with boxing does not crash when the containing If is broken
 * @library /test/lib /
 * @run driver ${test.main.class}
 */

package compiler.loopopts;
import compiler.lib.ir_framework.*;
import jdk.test.lib.Utils;

public class TestBoxingInfiniteLoopBrokenIf {
    static boolean flag;
    static volatile boolean testReturned;

    public static void main(String[] args) {
        TestFramework framework = new TestFramework();
        framework.addScenarios(
            new Scenario(0),
            new Scenario(1, "-XX:PerMethodTrapLimit=0", "-XX:CompileCommand=dontinline,*::valueOf", "-XX:CompileCommand=dontinline,*::throwWrongPath"),
            new Scenario(2, "-XX:PerMethodTrapLimit=0", "-XX:CompileCommand=dontinline,*::valueOf", "-XX:CompileCommand=dontinline,*::throwWrongPath",
                            "-XX:+IgnoreUnrecognizedVMOptions", "-XX:StressLongCountedLoop=1")
        );
        framework.start();
    }

    @Test
    static void test() {
        new Integer(0); // Enable EA + Loop opts

        if (flag) { // Always false
            throwWrongPath(); // Not inlined to simplify graph
        } else {
            // Infinite loop: j is always 0, Integer.valueOf(0) < 1 is always true.
            for (int j = 0; Integer.valueOf(j) < 1;) {
                j = 0;
            }
        }
    }

    @Run(test = "test")
    @Warmup(0)
    static void runTest(RunInfo info) {
        testReturned = false;
        Thread thread = new Thread(() -> {
            test();
            testReturned = true;
        });
        thread.setDaemon(true);
        thread.start();
        try {
            Thread.sleep(Utils.adjustTimeout(500));
        } catch (InterruptedException e) {
        }
        if (testReturned) {
            throw new RuntimeException("test() should not return: infinite loop was incorrectly optimized away");
        }
    }

    static void throwWrongPath() {
        throw new RuntimeException("Wrong path");
    }
}