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 /*
25 * @test
26 * @enablePreview
27 * @run testng TestSynchronizedOp
28 */
29
30 import org.testng.Assert;
31 import org.testng.annotations.Test;
32
33 import java.lang.classfile.ClassFile;
34 import java.lang.classfile.CodeModel;
35 import java.lang.classfile.MethodModel;
36 import java.lang.classfile.Opcode;
37 import java.lang.classfile.instruction.MonitorInstruction;
38 import java.lang.invoke.MethodHandle;
39 import java.lang.invoke.MethodHandles;
40 import java.lang.reflect.Method;
41 import java.lang.reflect.code.OpTransformer;
42 import java.lang.reflect.code.bytecode.BytecodeGenerator;
43 import java.lang.reflect.code.op.CoreOp;
44 import java.lang.runtime.CodeReflection;
45 import java.util.Map;
46 import java.util.Optional;
47 import java.util.stream.Collectors;
48 import java.util.stream.Stream;
49
50 public class TestSynchronizedOp {
51
52 @CodeReflection
53 static int f(Object o, int i, int[] a) {
54 synchronized (o) {
55 if (i < 0) {
56 throw new RuntimeException();
57 }
58 a[0] = ++i;
59 }
60 return i;
61 }
62
63 @Test
64 public void testInstructions() {
65 CoreOp.FuncOp f = getFuncOp("f");
66 f = f.transform(OpTransformer.LOWERING_TRANSFORMER);
67
68 byte[] classdata = BytecodeGenerator.generateClassData(MethodHandles.lookup(), f);
69 CodeModel cmf = ClassFile.of().parse(classdata).methods().stream()
70 .filter(mm -> mm.methodName().equalsString("f"))
71 .findFirst().flatMap(MethodModel::code).orElseThrow();
72 Map<Opcode, Long> monitorCount = cmf.elementStream().<Opcode>mapMulti((i, c) -> {
73 if (i instanceof MonitorInstruction mi) {
74 c.accept(mi.opcode());
75 }
76 }).collect(Collectors.groupingBy(oc -> oc, Collectors.counting()));
77 Assert.assertEquals(monitorCount, Map.of(
78 Opcode.MONITORENTER, 1L,
79 Opcode.MONITOREXIT, 2L));
80 }
81
82 @Test
83 public void testExecution() throws Throwable {
84 CoreOp.FuncOp f = getFuncOp("f");
85 f = f.transform(OpTransformer.LOWERING_TRANSFORMER);
86
87 MethodHandle mf = BytecodeGenerator.generate(MethodHandles.lookup(), f);
88
89 Object monitor = new Object();
90 int[] a = new int[1];
91 Assert.assertEquals((int) mf.invoke(monitor, 0, a), 1);
92 a[0] = 0;
93 Assert.assertThrows(RuntimeException.class, () -> {
94 int i = (int) mf.invoke(monitor, -1, a);
95 });
96 Assert.assertEquals(a[0], 0);
97 }
98
99 static CoreOp.FuncOp getFuncOp(String name) {
100 Optional<Method> om = Stream.of(TestSynchronizedOp.class.getDeclaredMethods())
101 .filter(m -> m.getName().equals(name))
102 .findFirst();
103
104 Method m = om.get();
105 return m.getCodeModel().get();
106 }
107 }