1 /*
2 * Copyright (c) 2017, 2025, 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
25 /*
26 * @test
27 * @summary test core reflection on value classes
28 * @enablePreview
29 * @run junit/othervm Reflection
30 */
31
32 import java.lang.reflect.Array;
33 import java.lang.reflect.Constructor;
34 import java.lang.reflect.Field;
35 import java.lang.reflect.InvocationTargetException;
36 import java.lang.reflect.Method;
37 import java.util.Arrays;
38 import java.util.stream.Stream;
39
40 import jdk.internal.value.ValueClass;
41 import jdk.internal.vm.annotation.LooselyConsistentValue;
42 import jdk.internal.vm.annotation.NullRestricted;
43 import jdk.internal.vm.annotation.Strict;
44 import org.junit.jupiter.api.Test;
45 import org.junit.jupiter.params.ParameterizedTest;
46 import org.junit.jupiter.params.provider.Arguments;
47 import org.junit.jupiter.params.provider.MethodSource;
48 import static org.junit.jupiter.api.Assertions.*;
49
50 public class Reflection {
51 @LooselyConsistentValue
52 static value class V {
53 int x;
54 V(int x) {
55 this.x = x;
56 }
57 }
58
59 @LooselyConsistentValue
60 static value class Value {
61 @NullRestricted @Strict
62 V v1;
63 V v2;
64 Value(V v1, V v2) {
65 this.v1 = v1;
66 this.v2 = v2;
67 }
68
69 static Value newValue(V v1, V v2) {
70 return new Value(v1, v2);
71 }
72 }
73
74 @Test
75 void testNewInstance() throws Exception {
76 V v = new V(10);
77 Constructor<Value> ctor = Value.class.getDeclaredConstructor(V.class, V.class);
78 Value o = ctor.newInstance(v, v);
79 assertEquals(o.getClass(), Value.class);
80 }
81
82 @Test
83 void testAccess() throws Exception {
84 Field field = Value.class.getDeclaredField("v1");
85 V v = new V(10);
86 Value o = new Value(v, null);
87 assertEquals(v, field.get(o));
88
89 // accessible but no write access
90 assertTrue(field.trySetAccessible());
91 assertTrue(field.isAccessible());
92 assertThrows(IllegalAccessException.class, () -> field.set(o, v));
93 }
94
95 @Test
96 void testNullRestricted() throws Exception {
97 Method m = Value.class.getDeclaredMethod("newValue", V.class, V.class);
98 Throwable t = assertThrows(InvocationTargetException.class, () -> m.invoke(null, new Object[] {null, null}));
99 assertEquals(NullPointerException.class, t.getCause().getClass());
100 }
101
102 static Stream<Arguments> arrays() {
103 V v1 = new V(10);
104 V v2 = new V(20);
105 Value value = new Value(v1, v2);
106
107 V[] varray = (V[]) Array.newInstance(V.class, 2);
108 V[] varrayNR = (V[]) ValueClass.newNullRestrictedAtomicArray(V.class, 3, new V(0));
109 Value[] valuearray = (Value[]) Array.newInstance(Value.class, 2);
110 Value[] valuearrayNR = (Value[]) ValueClass.newNullRestrictedNonAtomicArray(Value.class, 3, new Value(new V(0), new V(0)));
111
112 return Stream.of(
113 Arguments.of(V[].class, varray, false, v1),
114 Arguments.of(V[].class, varrayNR, true, v2),
115 Arguments.of(Value[].class, valuearray, false, value),
116 Arguments.of(Value[].class, valuearrayNR, true, value)
117
118 );
119 }
120
121 /**
122 * Setting the elements of an array.
123 * NPE will be thrown if null is set on an element in a null-restricted value class array
124 */
125 @ParameterizedTest
126 @MethodSource("arrays")
127 public void testArrays(Class<?> arrayClass, Object[] array, boolean nullRestricted, Object element) {
128 Class<?> componentType = arrayClass.getComponentType();
129 assertTrue(arrayClass.isArray());
130 // TODO: check Array.getComponentType(array) instead
131 assertTrue(array.getClass() == arrayClass || nullRestricted);
132 assertTrue(array.getClass().getComponentType() == componentType || nullRestricted);
133
134 for (int i = 0; i < array.length; i++) {
135 Object o = Array.get(array, i);
136 if (nullRestricted) {
137 assertTrue(o != null);
138 } else {
139 assertTrue(o == null);
140 }
141 }
142
143 // set elements
144 for (int i = 0; i < array.length; i++) {
145 Array.set(array, i, element);
146 assertTrue(Array.get(array, i) == element);
147 }
148
149 Arrays.setAll(array, i -> array[i]);
150
151 // test nullable
152 for (int i = 0; i < array.length; i++) {
153 if (nullRestricted) {
154 final int index = i;
155 assertThrows(NullPointerException.class, () -> Array.set(array, index, null));
156 } else {
157 Array.set(array, i, null);
158 }
159 }
160 }
161 }