1 /*
2 * Copyright (c) 2019, 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 /*
25 * @test
26 * @bug 8246774
27 * @summary Basic tests for ObjectMethods
28 * @run testng ObjectMethodsTest
29 */
30
31 import java.util.List;
32 import java.lang.invoke.CallSite;
33 import java.lang.invoke.MethodHandle;
34 import java.lang.invoke.MethodHandles;
35 import java.lang.invoke.MethodType;
36 import java.lang.runtime.ObjectMethods;
37 import org.testng.annotations.Test;
38 import static java.lang.invoke.MethodType.methodType;
39 import static org.testng.Assert.assertEquals;
40 import static org.testng.Assert.assertThrows;
41 import static org.testng.Assert.assertFalse;
42 import static org.testng.Assert.assertTrue;
43
44 @Test
45 public class ObjectMethodsTest {
46
47 public static class C {
48 static final MethodType EQUALS_DESC = methodType(boolean.class, C.class, Object.class);
49 static final MethodType HASHCODE_DESC = methodType(int.class, C.class);
50 static final MethodType TO_STRING_DESC = methodType(String.class, C.class);
51
52 static final MethodHandle[] ACCESSORS = accessors();
53 static final String NAME_LIST = "x;y";
54 private static MethodHandle[] accessors() {
55 try {
56 return new MethodHandle[]{
57 MethodHandles.lookup().findGetter(C.class, "x", int.class),
58 MethodHandles.lookup().findGetter(C.class, "y", int.class),
59 };
60 } catch (Exception e) {
61 throw new AssertionError(e);
62 }
63 }
64
65 private final int x;
66 private final int y;
67 C (int x, int y) { this.x = x; this.y = y; }
68 public int x() { return x; }
69 public int y() { return y; }
70 }
71
72 static class Empty {
73 static final MethodType EQUALS_DESC = methodType(boolean.class, Empty.class, Object.class);
74 static final MethodType HASHCODE_DESC = methodType(int.class, Empty.class);
75 static final MethodType TO_STRING_DESC = methodType(String.class, Empty.class);
76 static final MethodHandle[] ACCESSORS = new MethodHandle[] { };
77 static final String NAME_LIST = "";
78 Empty () { }
79 }
80
81 static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
82
83 public void testEqualsC() throws Throwable {
84 CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "equals", C.EQUALS_DESC, C.class, C.NAME_LIST, C.ACCESSORS);
85 MethodHandle handle = cs.dynamicInvoker();
86 C c = new C(5, 5);
87 assertTrue((boolean)handle.invokeExact(c, (Object)c));
88 assertTrue((boolean)handle.invokeExact(c, (Object)new C(5, 5)));
89 assertFalse((boolean)handle.invokeExact(c, (Object)new C(5, 4)));
90 assertFalse((boolean)handle.invokeExact(c, (Object)new C(4, 5)));
91 assertFalse((boolean)handle.invokeExact(c, (Object)null));
92 assertFalse((boolean)handle.invokeExact(c, new Object()));
93 }
94
95 public void testEqualsEmpty() throws Throwable {
96 CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "equals", Empty.EQUALS_DESC, Empty.class, Empty.NAME_LIST, Empty.ACCESSORS);
97 MethodHandle handle = cs.dynamicInvoker();
98 Empty e = new Empty();
99 assertTrue((boolean)handle.invokeExact(e, (Object)e));
100 assertTrue((boolean)handle.invokeExact(e, (Object)new Empty()));
101 assertFalse((boolean)handle.invokeExact(e, (Object)null));
102 assertFalse((boolean)handle.invokeExact(e, new Object()));
103 }
104
105 public void testHashCodeC() throws Throwable {
106 CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "hashCode", C.HASHCODE_DESC, C.class, "x;y", C.ACCESSORS);
107 MethodHandle handle = cs.dynamicInvoker();
108 C c = new C(6, 7);
109 int hc = (int)handle.invokeExact(c);
110 assertEquals(hc, hashCombiner(c.x(), c.y()));
111
112 assertEquals((int)handle.invokeExact(new C(100, 1)), hashCombiner(100, 1));
113 assertEquals((int)handle.invokeExact(new C(0, 0)), hashCombiner(0, 0));
114 assertEquals((int)handle.invokeExact(new C(-1, 100)), hashCombiner(-1, 100));
115 assertEquals((int)handle.invokeExact(new C(100, 1)), hashCombiner(100, 1));
116 assertEquals((int)handle.invokeExact(new C(100, -1)), hashCombiner(100, -1));
117 }
118
119 public void testHashCodeEmpty() throws Throwable {
120 CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "hashCode", Empty.HASHCODE_DESC, Empty.class, "", Empty.ACCESSORS);
121 MethodHandle handle = cs.dynamicInvoker();
122 Empty e = new Empty();
123 assertEquals((int)handle.invokeExact(e), 0);
124 }
125
126 public void testToStringC() throws Throwable {
127 CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "toString", C.TO_STRING_DESC, C.class, C.NAME_LIST, C.ACCESSORS);
128 MethodHandle handle = cs.dynamicInvoker();
129 assertEquals((String)handle.invokeExact(new C(8, 9)), "C[x=8, y=9]" );
130 assertEquals((String)handle.invokeExact(new C(10, 11)), "C[x=10, y=11]" );
131 assertEquals((String)handle.invokeExact(new C(100, -9)), "C[x=100, y=-9]");
132 assertEquals((String)handle.invokeExact(new C(0, 0)), "C[x=0, y=0]" );
133 }
134
135 public void testToStringEmpty() throws Throwable {
136 CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "toString", Empty.TO_STRING_DESC, Empty.class, Empty.NAME_LIST, Empty.ACCESSORS);
137 MethodHandle handle = cs.dynamicInvoker();
138 assertEquals((String)handle.invokeExact(new Empty()), "Empty[]");
139 }
140
141 Class<NullPointerException> NPE = NullPointerException.class;
142 Class<IllegalArgumentException> IAE = IllegalArgumentException.class;
143
144 public void exceptions() {
145 assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "badName", C.EQUALS_DESC, C.class, C.NAME_LIST, C.ACCESSORS));
146 assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "toString", C.TO_STRING_DESC, C.class, "x;y;z", C.ACCESSORS));
147 assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "toString", C.TO_STRING_DESC, C.class, "x;y", new MethodHandle[]{}));
148 assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "toString", C.TO_STRING_DESC, this.getClass(), "x;y", C.ACCESSORS));
149
150 assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "toString", C.EQUALS_DESC, C.class, "x;y", C.ACCESSORS));
151 assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "hashCode", C.TO_STRING_DESC, C.class, "x;y", C.ACCESSORS));
152 assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "equals", C.HASHCODE_DESC, C.class, "x;y", C.ACCESSORS));
153
154 record NamePlusType(String mn, MethodType mt) {}
155 List<NamePlusType> namePlusTypeList = List.of(
156 new NamePlusType("toString", C.TO_STRING_DESC),
157 new NamePlusType("equals", C.EQUALS_DESC),
158 new NamePlusType("hashCode", C.HASHCODE_DESC)
159 );
160
161 for (NamePlusType npt : namePlusTypeList) {
162 assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), npt.mt(), C.class, "x;y", null));
163 assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), npt.mt(), C.class, "x;y", new MethodHandle[]{null}));
164 assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), npt.mt(), C.class, null, C.ACCESSORS));
165 assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), npt.mt(), null, "x;y", C.ACCESSORS));
166 assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), null, C.class, "x;y", C.ACCESSORS));
167 assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, null, npt.mt(), C.class, "x;y", C.ACCESSORS));
168 assertThrows(NPE, () -> ObjectMethods.bootstrap(null, npt.mn(), npt.mt(), C.class, "x;y", C.ACCESSORS));
169 }
170 }
171
172 // Based on the ObjectMethods internal implementation
173 private static int hashCombiner(int x, int y) {
174 return x*31 + y;
175 }
176 }