1 /*
  2  * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  */
 23 
 24 import org.testng.Assert;
 25 import org.testng.annotations.Test;
 26 import org.testng.annotations.DataProvider;
 27 
 28 import java.lang.invoke.MethodHandles;
 29 import java.lang.reflect.InvocationTargetException;
 30 import java.lang.reflect.Method;
 31 import java.lang.reflect.code.interpreter.Interpreter;
 32 import java.lang.reflect.code.op.CoreOp;
 33 import java.lang.runtime.CodeReflection;
 34 import java.util.*;
 35 import java.util.stream.Stream;
 36 
 37 /*
 38  * @test
 39  * @run testng TestOverloads
 40  */
 41 
 42 public class TestOverloads {
 43 
 44     @CodeReflection
 45     static int f() {
 46        return 0;
 47     }
 48 
 49     @CodeReflection
 50     static int f(int i) {
 51        return 1;
 52     }
 53 
 54     @CodeReflection
 55     static int f(Integer i) {
 56        return 2;
 57     }
 58 
 59     @CodeReflection
 60     static int f(Object o) {
 61        return 3;
 62     }
 63 
 64     @CodeReflection
 65     static int f(List<Integer> l) {
 66        return 4;
 67     }
 68 
 69     @CodeReflection
 70     static int f(List<Integer> l, Object o) {
 71        return 5;
 72     }
 73 
 74     @DataProvider(name = "testData")
 75     public static Object[][]  testData() {
 76         return new Object[][]{
 77             new Object[] {new Class[]{}, new Object[]{}},
 78             new Object[] {new Class[]{int.class}, new Object[]{-1}},
 79             new Object[] {new Class[]{Integer.class}, new Object[]{-1}},
 80             new Object[] {new Class[]{Object.class}, new Object[]{"hello"}},
 81             new Object[] {new Class[]{List.class}, new Object[]{List.of()}},
 82             new Object[] {new Class[]{List.class, Object.class}, new Object[]{List.of(), -1}}
 83         };
 84     }
 85 
 86     @Test(dataProvider = "testData")
 87     public static void testOverloads(Class<?>[] paramTypes, Object[] params) {
 88         try {
 89             Class<TestOverloads> clazz = TestOverloads.class;
 90             Method method = clazz.getDeclaredMethod("f", paramTypes);
 91             CoreOp.FuncOp f = method.getCodeModel().orElseThrow();
 92             var res1 = Interpreter.invoke(MethodHandles.lookup(), f, params);
 93             var res2 = method.invoke(null, params);
 94 
 95             Assert.assertEquals(res1, res2);
 96 
 97         } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
 98             throw new RuntimeException(e);
 99         }
100     }
101 }