Tests

We use unit test suites to verify the correctness of our virtual machine. Here you can access the source code of the tests.

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package at.ssw.hotswap.test.methods;

import static org.junit.Assert.assertEquals;

import org.junit.Before;
import org.junit.Test;

import at.ssw.hotswap.HotSwapTool;

/**
 * Test case that makes sure that old code does not get on-stack-replaced.
 *
 * @author Thomas Wuerthinger
 */

public class OldCodeNonOSRTest {

    // Chose high enough to make sure method could get OSR (usually the OSR flag in the VM is set to about 15000)
    private static final int N = 100000;

    @Before
    public void setUp() throws Exception {
        HotSwapTool.toVersion(OldCodeNonOSRTest.class, 0);
    }

    // Version 0
    public static class A {

        public int value() {
            return 5;
        }

        public int oldMethod() {
            HotSwapTool.toVersion(OldCodeNonOSRTest.class, 1);
            int sum = 0;
            for (int i=0; i<N; i++) {
                sum += i;
            }
            return (sum & deletedMethod()) | 1;
        }

        public int oldMethod2() {
            int sum = 0;
            for (int i=0; i<N; i++) {
                sum += i;
            }
            HotSwapTool.toVersion(OldCodeNonOSRTest.class, 1);
            return (sum & deletedMethod()) | 1;
        }

        public int oldMethod3() {
            int sum = 0;
            for (int i=0; i<N; i++) {
                sum += i;
            }
            HotSwapTool.toVersion(OldCodeNonOSRTest.class, 1);
            for (int i=0; i<N; i++) {
                sum += i;
            }
            return (sum & deletedMethod()) | 1;
        }

        public int deletedMethod() {
            return 1;
        }
    }

    // Version 1
    public static class A___1 {

        public int oldMethod() {
            return 2;
        }
    }

    @Test
    public void testOldCodeNonOSR() {

        assert HotSwapTool.getCurrentVersion(OldCodeNonOSRTest.class) == 0;
        A a = new A();

        assertEquals(1, a.oldMethod());
        assert HotSwapTool.getCurrentVersion(OldCodeNonOSRTest.class) == 1;
        assertEquals(2, a.oldMethod());

        HotSwapTool.toVersion(OldCodeNonOSRTest.class, 0);

        assertEquals(1, a.oldMethod2());
        assert HotSwapTool.getCurrentVersion(OldCodeNonOSRTest.class) == 1;
        assertEquals(2, a.oldMethod());

        HotSwapTool.toVersion(OldCodeNonOSRTest.class, 0);

        assertEquals(1, a.oldMethod3());
        assert HotSwapTool.getCurrentVersion(OldCodeNonOSRTest.class) == 1;
        assertEquals(2, a.oldMethod());

        HotSwapTool.toVersion(OldCodeNonOSRTest.class, 0);
    }
}
 

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