Level2RecompilationTest.java

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/**
 * @test Level2RecompilationTest
 * @summary Test downgrading mechanism from level 3 to level 2 for those profiled methods.
 * @library /testlibrary /testlibrary/whitebox /compiler/whitebox
 * @build Level2RecompilationTest
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+TieredCompilation
 *                   -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCounterDecay
 *                   -XX:CompileCommand=compileonly,SimpleTestCase$Helper::*
 *                   -XX:CompileCommand=print,SimpleTestCase$Helper::*
 *                   Level2RecompilationTest
 */
public class Level2RecompilationTest extends CompLevelsTest {
    public static void main(String[] args) throws Throwable {
        if (CompilerWhiteBoxTest.skipOnTieredCompilation(false)) {
            throw new RuntimeException("Test isn't applicable for non-tiered mode");
        }
        String[] testcases = {"METHOD_TEST", "OSR_STATIC_TEST"};
        CompilerWhiteBoxTest.main(Level2RecompilationTest::new, testcases);
    }

    protected Level2RecompilationTest(TestCase testCase) {
        super(testCase);
        // to prevent inlining of #method
        WHITE_BOX.testSetDontInlineMethod(method, true);
    }

    @Override
    protected void test() throws Exception {
        if (skipXcompOSR()) {
          return;
        }

        checkNotCompiled();
        int bci = WHITE_BOX.getMethodEntryBci(method);
        WHITE_BOX.markMethodProfiled(method);
        if (testCase.isOsr()) {
            // for OSR compilation, it must be the begin of a BB.
            // c1_GraphBulider.cpp:153  assert(method()->bci_block_start().at(cur_bci), ...
            bci = 0;
        }

        WHITE_BOX.enqueueMethodForCompilation(method, COMP_LEVEL_FULL_PROFILE, bci);
        checkCompiled();
        checkLevel(COMP_LEVEL_LIMITED_PROFILE, getCompLevel());

        for (int i=0; i<100; ++i) {
            WHITE_BOX.enqueueMethodForCompilation(method, COMP_LEVEL_FULL_PROFILE, bci);
            waitBackgroundCompilation();
            checkLevel(COMP_LEVEL_LIMITED_PROFILE, getCompLevel());
        }
    }

    @Override
    protected void checkLevel(int expected, int actual) {
        if (expected == COMP_LEVEL_FULL_PROFILE
                && actual == COMP_LEVEL_LIMITED_PROFILE) {
            // for simple method full_profile may be replaced by limited_profile
            if (IS_VERBOSE) {
                System.out.printf("Level check: full profiling was replaced "
                        + "by limited profiling. Expected: %d, actual:%d\n",
                        expected, actual);
            }
            return;
        }
        super.checkLevel(expected, actual);
    }
}