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

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 *

 * 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

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 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

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/*

 * @test

 * @bug 8140574

 * @summary Verify proper re-execution of checks after merging of uncommon traps

 * @run main/othervm -Xcomp -XX:-TieredCompilation -XX:CompileCommand=compileonly,TestUncommonTrapMerging::test* TestUncommonTrapMerging Test1

 * @run main/othervm -XX:CompileCommand=compileonly,TestUncommonTrapMerging::test* TestUncommonTrapMerging Test2

 */

public class TestUncommonTrapMerging {

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

        if (args.length < 1) {

            throw new RuntimeException("Not enough arguments!");

        }

        TestUncommonTrapMerging mytest = new TestUncommonTrapMerging();

        String testcase = args[0];

        if (testcase.equals("Test1")) {

            try {

                // '42' should hit the 'arg > 0' check

                mytest.test(42);

            } catch (OutOfMemoryError e) {

                // expected

            }

        } else if (testcase.equals("Test2")) {

            // Compile test2 with uncommon traps at path 1 and path 2

            for (int i = 0; i < 100_000; i++) {

                mytest.test2(-1, 0);

            }

            // Compile test3 which inlines test2 with uncommon traps at

            // path 1 and path 2. Because test3 always passes 'value = 1',

            // C2 will remove the 'value > 0' check and then merge the two

            // uncommon traps.

            for (int i = 0; i < 100_000; i++) {

                mytest.test3(0);

            }

            // This should return through path 2

            if (!mytest.test3(42)) {

                throw new RuntimeException("test2 returned through wrong path!");

            }

        }

    }

    public void test(int arg) throws Throwable {

        // The following two checks should not be merged if the

        // uncommon trap of the dominating if has 'Reason_unloaded'

        // because we need to re-execute both checks after deopt.

        if (arg < 0) {

            throw new RuntimeException("Should not reach here");

        } else if (arg > 0) {

            throw new OutOfMemoryError();

        }

        throw new RuntimeException("Should not reach here");

    }

    public boolean test2(int arg, int value) {

        if (arg < 0) {

            if (value > 0) {

                // path 1

                return false;

            }

        } else if (arg > 0) {

            // path 2

            return true;

        }

        // path 3

        return false;

    }

    public boolean test3(int arg) {

        int i;

        for (i = 0; i < 1; ++i) { }

        // i == 1

        return test2(arg, i);

    }

}