TestNonSerializableLambdaNameStability.java revision 2942:08092deced3f 
1/*
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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
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7 * published by the Free Software Foundation.
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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 8067422
27 * @summary Check that the lambda names are not unnecessarily unstable
28 * @library /tools/lib
29 * @modules jdk.jdeps/com.sun.tools.classfile
30 *          jdk.compiler/com.sun.tools.javac.api
31 *          jdk.compiler/com.sun.tools.javac.file
32 *          jdk.compiler/com.sun.tools.javac.main
33 * @build ToolBox
34 * @run main TestNonSerializableLambdaNameStability
35 */
36
37import com.sun.tools.classfile.ClassFile;
38import com.sun.tools.classfile.Method;
39import java.io.ByteArrayInputStream;
40import java.io.InputStream;
41import java.util.ArrayList;
42import java.util.List;
43import javax.tools.StandardLocation;
44
45public class TestNonSerializableLambdaNameStability {
46
47    public static void main(String... args) throws Exception {
48        new TestNonSerializableLambdaNameStability().run();
49    }
50
51    String lambdaSource = "public class L%d {\n" +
52                          "    public static class A {\n" +
53                          "        private Runnable r = () -> { };\n" +
54                          "    }\n" +
55                          "    public static class B {\n" +
56                          "        private Runnable r = () -> { };\n" +
57                          "    }\n" +
58                          "    private Runnable r = () -> { };\n" +
59                          "}\n";
60
61    String expectedLambdaMethodName = "lambda$new$0";
62
63    void run() throws Exception {
64        List<String> sources = new ArrayList<>();
65
66        for (int i = 0; i < 3; i++) {
67            sources.add(String.format(lambdaSource, i));
68        }
69
70        ToolBox tb = new ToolBox();
71
72        try (ToolBox.MemoryFileManager fm = new ToolBox.MemoryFileManager()) {
73            tb.new JavacTask()
74              .sources(sources.toArray(new String[sources.size()]))
75              .fileManager(fm)
76              .run();
77
78            for (String file : fm.files.get(StandardLocation.CLASS_OUTPUT).keySet()) {
79                byte[] fileBytes = fm.getFileBytes(StandardLocation.CLASS_OUTPUT, file);
80                try (InputStream in = new ByteArrayInputStream(fileBytes)) {
81                    boolean foundLambdaMethod = false;
82                    ClassFile cf = ClassFile.read(in);
83                    StringBuilder seenMethods = new StringBuilder();
84                    String sep = "";
85                    for (Method m : cf.methods) {
86                        String methodName = m.getName(cf.constant_pool);
87                        if (expectedLambdaMethodName.equals(methodName)) {
88                            foundLambdaMethod = true;
89                            break;
90                        }
91                        seenMethods.append(sep);
92                        seenMethods.append(methodName);
93                        sep = ", ";
94                    }
95
96                    if (!foundLambdaMethod) {
97                        throw new AbstractMethodError("Did not find the lambda method, " +
98                                                      "found methods: " + seenMethods.toString());
99                    }
100                }
101            }
102        }
103    }
104}
105