1 /*
2 * Copyright (c) 2021, 2023, 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 8266925
27 * @summary hidden class members can't be statically invocable
28 * @modules java.base/jdk.internal.misc
29 * @enablePreview
30 * @build java.base/*
31 * @run testng StaticInvocableTest
32 */
33
34 import java.lang.classfile.ClassFile;
35 import java.lang.constant.ClassDesc;
36 import java.lang.constant.MethodTypeDesc;
37 import java.lang.invoke.MethodHandle;
38 import java.lang.invoke.MethodHandles.Lookup;
39 import java.lang.invoke.MethodType;
40 import java.lang.invoke.LookupHelper;
41 import java.lang.reflect.AccessFlag;
42 import org.testng.annotations.Test;
43
44 import static java.lang.classfile.ClassFile.ACC_PUBLIC;
45 import static java.lang.classfile.ClassFile.ACC_STATIC;
46 import static java.lang.constant.ConstantDescs.CD_Object;
47 import static java.lang.constant.ConstantDescs.CD_int;
48 import static java.lang.constant.ConstantDescs.INIT_NAME;
49 import static java.lang.constant.ConstantDescs.MTD_void;
50
51 public class StaticInvocableTest {
52 public static void main(String[] args) throws Throwable {
53 StaticInvocableTest test = new StaticInvocableTest();
54 test.testJavaLang();
55 test.testJavaUtil();
56 test.testJdkInternalMisc();
57 test.testJavaLangInvoke();
58 test.testProhibitedJavaPkg();
59 System.out.println("TEST PASSED");
60 }
61
62 // Test hidden classes from different packages
63 // (see j.l.i.InvokerBytecodeGenerator::isStaticallyInvocable).
64 @Test public void testJavaLang() throws Throwable { test("java/lang"); }
65 @Test public void testJavaUtil() throws Throwable { test("java/util"); }
66 @Test public void testJdkInternalMisc() throws Throwable { test("jdk/internal/misc"); }
67 @Test public void testJavaLangInvoke() throws Throwable { test("java/lang/invoke"); }
68 @Test public void testProhibitedJavaPkg() throws Throwable {
69 try {
70 test("java/prohibited");
71 } catch (IllegalArgumentException e) {
72 return;
73 }
74 throw new RuntimeException("Expected SecurityException");
75 }
76
77 private static void test(String pkg) throws Throwable {
78 byte[] bytes = dumpClass(pkg);
79 Lookup lookup;
80 if (pkg.equals("java/prohibited")) {
81 StaticInvocableTest sampleclass = new StaticInvocableTest();
82 lookup = LookupHelper.newLookup(sampleclass.getClass());
83 } else if (pkg.equals("java/lang")) {
84 lookup = LookupHelper.newLookup(Object.class);
85 } else if (pkg.equals("java/util")) {
86 lookup = LookupHelper.newLookup(java.util.ArrayList.class);
87 } else if (pkg.equals("jdk/internal/misc")) {
88 lookup = LookupHelper.newLookup(jdk.internal.misc.Signal.class);
89 } else if (pkg.equals("java/lang/invoke")) {
90 lookup = LookupHelper.newLookup(java.lang.invoke.CallSite.class);
91 } else {
92 throw new RuntimeException("Unexpected pkg: " + pkg);
93 }
94
95 // Define hidden class
96 Lookup l = lookup.defineHiddenClass(bytes, true);
97
98 MethodType t = MethodType.methodType(Object.class, int.class);
99 MethodHandle target = l.findStatic(l.lookupClass(), "get", t);
100
101 // Wrap target into LF (convert) to get "target" referenced from LF
102 MethodHandle wrappedMH = target.asType(MethodType.methodType(Object.class, Integer.class));
103
104 // Invoke enough times to provoke LF compilation to bytecode.
105 for (int i = 0; i<100; i++) {
106 Object r = wrappedMH.invokeExact((Integer)1);
107 }
108 }
109
110 /*
111 * Constructs bytecode for the following class:
112 * public class pkg.MyClass {
113 * MyClass() {}
114 * public Object get(int i) { return null; }
115 * }
116 */
117 public static byte[] dumpClass(String pkg) {
118 return ClassFile.of().build(ClassDesc.of(pkg.replace('/', '.'), "MyClass"), clb -> {
119 clb.withSuperclass(CD_Object);
120 clb.withFlags(AccessFlag.PUBLIC, AccessFlag.SUPER);
121 clb.withMethodBody(INIT_NAME, MTD_void, 0, cob -> {
122 cob.aload(0);
123 cob.invokespecial(CD_Object, INIT_NAME, MTD_void);
124 cob.return_();
125 });
126 clb.withMethodBody("get", MethodTypeDesc.of(CD_Object, CD_int),
127 ACC_PUBLIC | ACC_STATIC, cob -> {
128 cob.aconst_null();
129 cob.areturn();
130 });
131 });
132 }
133 }