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/**

 * @test

 * @bug 8073956

 * @summary Tests C2 EA with allocated object escaping through a call.

 *

 * @run main/othervm

 *      -XX:CompileCommand=dontinline,compiler.escapeAnalysis.TestEscapeThroughInvoke::create

 *      compiler.escapeAnalysis.TestEscapeThroughInvoke

 */

package compiler.escapeAnalysis;

public class TestEscapeThroughInvoke {

    private A a;

    public static void main(String[] args) {

        TestEscapeThroughInvoke test = new TestEscapeThroughInvoke();

        test.a = new A(42);

        // Make sure run gets compiled by C2

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

            test.run();

        }

    }

    private void run() {

        // Allocate something to trigger EA

        new Object();

        // Create a new escaping instance of A and

        // verify that it is always equal to 'a.saved'.

        A escapingA = create(42);

        a.check(escapingA);

    }

    // Create and return a new instance of A that escaped through 'A::saveInto'.

    // The 'dummy' parameters are needed to avoid EA skipping the methods.

    private A create(Integer dummy) {

        A result = new A(dummy);

        result.saveInto(a, dummy); // result escapes into 'a' here

        return result;

    }

    static class A {

        private A saved;

        public A(Integer dummy) {

        }

        public void saveInto(A other, Integer dummy) {

            other.saved = this;

        }

        public void check(A other) {

            if (this.saved != other) {

                throw new RuntimeException("TEST FAILED: Objects not equal.");

            }

        }

    }

}