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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * 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).

 *

 * You should have received a copy of the GNU General Public License version

 * 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 Level2RecompilationTest

 * @summary Test downgrading mechanism from level 3 to level 2 for those profiled methods.

 * @library /test/lib /

 * @modules java.base/jdk.internal.misc

 *          java.management

 *

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                                sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:+TieredCompilation

 *                   -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCounterDecay

 *                   -XX:CompileCommand=compileonly,compiler.whitebox.SimpleTestCaseHelper::*

 *                   -XX:CompileCommand=print,compiler.whitebox.SimpleTestCaseHelper::*

 *                   compiler.tiered.Level2RecompilationTest

 */

package compiler.tiered;

import compiler.whitebox.CompilerWhiteBoxTest;

import jtreg.SkippedException;

public class Level2RecompilationTest extends CompLevelsTest {

    public static void main(String[] args) throws Throwable {

        if (CompilerWhiteBoxTest.skipOnTieredCompilation(false)) {

            throw new SkippedException("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<1_000; ++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);

    }

}