1 /*
2 * Copyright (c) 2015, 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 8057967
27 * @run main/bootclasspath -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:+TraceClassUnloading
28 * -XX:+PrintCompilation -XX:+TraceDependencies -XX:+TraceReferenceGC
29 * -verbose:gc java.lang.invoke.CallSiteDepContextTest
30 */
31 package java.lang.invoke;
32
33 import java.lang.ref.*;
34 import java.lang.reflect.Field;
35
36 import jdk.internal.org.objectweb.asm.*;
37 import sun.misc.Unsafe;
38
39 import static jdk.internal.org.objectweb.asm.Opcodes.*;
40
41 public class CallSiteDepContextTest {
42 static final Unsafe UNSAFE = Unsafe.getUnsafe();
43 static final MethodHandles.Lookup LOOKUP = MethodHandles.Lookup.IMPL_LOOKUP;
44 static final String CLASS_NAME = "java/lang/invoke/Test";
45 static final String METHOD_NAME = "m";
46 static final MethodType TYPE = MethodType.methodType(int.class);
47
48 static MutableCallSite mcs;
49 static MethodHandle bsmMH;
50
51 static {
52 try {
53 bsmMH = LOOKUP.findStatic(
54 CallSiteDepContextTest.class, "bootstrap",
55 MethodType.methodType(CallSite.class, MethodHandles.Lookup.class, String.class, MethodType.class));
56 } catch(Throwable e) {
57 throw new InternalError(e);
58 }
59 }
60
61 public static CallSite bootstrap(MethodHandles.Lookup caller,
62 String invokedName,
63 MethodType invokedType) {
64 return mcs;
65 }
66
67 static class T {
68 static int f1() { return 1; }
69 static int f2() { return 2; }
70 }
71
72 static byte[] getClassFile(String suffix) {
73 ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
74 MethodVisitor mv;
75 cw.visit(52, ACC_PUBLIC | ACC_SUPER, CLASS_NAME + suffix, null, "java/lang/Object", null);
76 {
77 mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, METHOD_NAME, TYPE.toMethodDescriptorString(), null, null);
78 mv.visitCode();
79 Handle bsm = new Handle(H_INVOKESTATIC,
80 "java/lang/invoke/CallSiteDepContextTest", "bootstrap",
81 bsmMH.type().toMethodDescriptorString());
82 mv.visitInvokeDynamicInsn("methodName", TYPE.toMethodDescriptorString(), bsm);
83 mv.visitInsn(IRETURN);
84 mv.visitMaxs(0, 0);
85 mv.visitEnd();
86 }
87 cw.visitEnd();
88 return cw.toByteArray();
89 }
90
91 private static void execute(int expected, MethodHandle... mhs) throws Throwable {
92 for (int i = 0; i < 20_000; i++) {
93 for (MethodHandle mh : mhs) {
94 int r = (int) mh.invokeExact();
95 if (r != expected) {
96 throw new Error(r + " != " + expected);
97 }
98 }
99 }
100 }
101
102 public static void testHiddenDepField() throws Exception {
103 try {
104 Field f = MethodHandleNatives.CallSiteContext.class.getDeclaredField("vmdependencies");
105 throw new AssertionError("Context.dependencies field should be hidden");
106 } catch(NoSuchFieldException e) { /* expected */ }
107 }
108
109 public static void testSharedCallSite() throws Throwable {
110 Class<?> cls1 = UNSAFE.defineAnonymousClass(Object.class, getClassFile("CS_1"), null);
111 Class<?> cls2 = UNSAFE.defineAnonymousClass(Object.class, getClassFile("CS_2"), null);
112
113 MethodHandle[] mhs = new MethodHandle[] {
114 LOOKUP.findStatic(cls1, METHOD_NAME, TYPE),
115 LOOKUP.findStatic(cls2, METHOD_NAME, TYPE)
116 };
117
118 mcs = new MutableCallSite(LOOKUP.findStatic(T.class, "f1", TYPE));
119 execute(1, mhs);
120 mcs.setTarget(LOOKUP.findStatic(T.class, "f2", TYPE));
121 execute(2, mhs);
122 }
123
124 public static void testNonBoundCallSite() throws Throwable {
125 mcs = new MutableCallSite(LOOKUP.findStatic(T.class, "f1", TYPE));
126
127 // mcs.context == null
128 MethodHandle mh = mcs.dynamicInvoker();
129 execute(1, mh);
130
131 // mcs.context == cls1
132 Class<?> cls1 = UNSAFE.defineAnonymousClass(Object.class, getClassFile("NonBound_1"), null);
133 MethodHandle mh1 = LOOKUP.findStatic(cls1, METHOD_NAME, TYPE);
134
135 execute(1, mh1);
136
137 mcs.setTarget(LOOKUP.findStatic(T.class, "f2", TYPE));
138
139 execute(2, mh, mh1);
140 }
141
142 static ReferenceQueue rq = new ReferenceQueue();
143 static PhantomReference ref;
144
145 public static void testGC(boolean clear, boolean precompile) throws Throwable {
146 String id = "_" + clear + "_" + precompile;
147
148 mcs = new MutableCallSite(LOOKUP.findStatic(T.class, "f1", TYPE));
149
150 Class<?>[] cls = new Class[] {
151 UNSAFE.defineAnonymousClass(Object.class, getClassFile("GC_1" + id), null),
152 UNSAFE.defineAnonymousClass(Object.class, getClassFile("GC_2" + id), null),
153 };
154
155 MethodHandle[] mhs = new MethodHandle[] {
156 LOOKUP.findStatic(cls[0], METHOD_NAME, TYPE),
157 LOOKUP.findStatic(cls[1], METHOD_NAME, TYPE),
158 };
159
160 // mcs.context == cls[0]
161 int r = (int) mhs[0].invokeExact();
162
163 execute(1, mhs);
164
165 ref = new PhantomReference<>(cls[0], rq);
166 cls[0] = UNSAFE.defineAnonymousClass(Object.class, getClassFile("GC_3" + id), null);
167 mhs[0] = LOOKUP.findStatic(cls[0], METHOD_NAME, TYPE);
168
169 do {
170 System.gc();
171 try {
172 Reference ref1 = rq.remove(100);
173 if (ref1 == ref) {
174 break;
175 }
176 } catch(InterruptedException e) { /* ignore */ }
177 } while (true);
178
179 if (clear) {
180 ref.clear();
181 System.gc(); // Ensure that the stale context is unloaded
182 }
183 if (precompile) {
184 execute(1, mhs);
185 }
186 mcs.setTarget(LOOKUP.findStatic(T.class, "f2", TYPE));
187 execute(2, mhs);
188 }
189
190 public static void main(String[] args) throws Throwable {
191 testHiddenDepField();
192 testSharedCallSite();
193 testNonBoundCallSite();
194 testGC(false, false);
195 testGC(false, true);
196 testGC( true, false);
197 testGC( true, true);
198 System.out.println("TEST PASSED");
199 }
200 }