/*

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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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test IsMethodCompilableTest

 * @bug 8007270 8006683 8007288 8022832

 * @summary testing of WB::isMethodCompilable()

 * @requires vm.flavor == "server" & (vm.opt.TieredStopAtLevel == null | vm.opt.TieredStopAtLevel == 4)

 * @requires !vm.emulatedClient

 * @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/timeout=2400 -XX:-TieredCompilation -Xmixed

 *      -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI

 *      -XX:PerMethodRecompilationCutoff=3 -XX:-UseCounterDecay

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

 *      compiler.whitebox.IsMethodCompilableTest

 */

package compiler.whitebox;

import jdk.test.lib.Platform;

public class IsMethodCompilableTest extends CompilerWhiteBoxTest {

    /**

     * Value of {@code -XX:PerMethodRecompilationCutoff}

     */

    protected static final long PER_METHOD_RECOMPILATION_CUTOFF;

    static {

        long tmp = Long.parseLong(

                getVMOption("PerMethodRecompilationCutoff", "400"));

        if (tmp == -1) {

            PER_METHOD_RECOMPILATION_CUTOFF = -1 /* Inf */;

        } else {

            PER_METHOD_RECOMPILATION_CUTOFF = (0xFFFFFFFFL & tmp);

        }

    }

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

        CompilerWhiteBoxTest.main(IsMethodCompilableTest::new, args);

    }

    private IsMethodCompilableTest(TestCase testCase) {

        super(testCase);

        // to prevent inlining of #method

        WHITE_BOX.testSetDontInlineMethod(method, true);

    }

    /**

     * Tests {@code WB::isMethodCompilable()} by recompilation of tested method

     * 'PerMethodRecompilationCutoff' times and checks compilation status. Also

     * checks that WB::clearMethodState() clears no-compilable flags. Only

     * applicable to c2 compiled methods.

     *

     * @throws Exception if one of the checks fails.

     */

    @Override

    protected void test() throws Exception {

        // Only c2 compilations can be disabled through PerMethodRecompilationCutoff

        if (!Platform.isServer() || Platform.isEmulatedClient()) {

            throw new Error("TESTBUG: Not server mode");

        }

        if (skipXcompOSR()) {

            return;

        }

        if (!isCompilable(COMP_LEVEL_FULL_OPTIMIZATION)) {

            throw new RuntimeException(method + " must be compilable");

        }

        System.out.println("PerMethodRecompilationCutoff = "

                + PER_METHOD_RECOMPILATION_CUTOFF);

        if (PER_METHOD_RECOMPILATION_CUTOFF == -1) {

            System.err.println(

                    "Warning: test is not applicable if PerMethodRecompilationCutoff == Inf");

            return;

        }

        // deoptimize 'PerMethodRecompilationCutoff' times

        for (long attempts = 0, successes = 0;

               (successes < PER_METHOD_RECOMPILATION_CUTOFF)  &&

               (attempts < PER_METHOD_RECOMPILATION_CUTOFF*2) &&

               isCompilable(COMP_LEVEL_FULL_OPTIMIZATION); attempts++) {

            if (compileAndDeoptimize() == COMP_LEVEL_FULL_OPTIMIZATION) {

                successes++;

            }

        }

        if (!testCase.isOsr() && !isCompilable(COMP_LEVEL_FULL_OPTIMIZATION)) {

            // in osr test case count of deopt maybe more than iterations

            throw new RuntimeException(method + " is not compilable after "

                    + PER_METHOD_RECOMPILATION_CUTOFF + " iterations");

        }

        // Now compile once more

        compileAndDeoptimize();

        if (isCompilable(COMP_LEVEL_FULL_OPTIMIZATION)) {

            throw new RuntimeException(method + " is still compilable after "

                    + PER_METHOD_RECOMPILATION_CUTOFF + " iterations");

        }

        checkNotCompiled();

        compile();

        waitBackgroundCompilation();

        checkNotCompiled(COMP_LEVEL_FULL_OPTIMIZATION);

        // WB.clearMethodState() must reset no-compilable flags

        WHITE_BOX.clearMethodState(method);

        if (!isCompilable(COMP_LEVEL_FULL_OPTIMIZATION)) {

            throw new RuntimeException(method

                    + " is not compilable after clearMethodState()");

        }

        compile();

        checkCompiled();

    }

    private int compileAndDeoptimize() throws Exception {

        compile();

        waitBackgroundCompilation();

        int compLevel = getCompLevel();

        deoptimize();

        return compLevel;

    }

}