TestNonSerializableLambdaNameStability.java revision 3294:9adfb22ff08f
1/*
2 * Copyright (c) 2014, 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 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 *          jdk.jdeps/com.sun.tools.javap
34 * @build ToolBox
35 * @run main TestNonSerializableLambdaNameStability
36 */
37
38import com.sun.tools.classfile.ClassFile;
39import com.sun.tools.classfile.Method;
40import java.io.ByteArrayInputStream;
41import java.io.InputStream;
42import java.util.ArrayList;
43import java.util.List;
44import javax.tools.StandardLocation;
45
46public class TestNonSerializableLambdaNameStability {
47
48    public static void main(String... args) throws Exception {
49        new TestNonSerializableLambdaNameStability().run();
50    }
51
52    String lambdaSource = "public class L%d {\n" +
53                          "    public static class A {\n" +
54                          "        private Runnable r = () -> { };\n" +
55                          "    }\n" +
56                          "    public static class B {\n" +
57                          "        private Runnable r = () -> { };\n" +
58                          "    }\n" +
59                          "    private Runnable r = () -> { };\n" +
60                          "}\n";
61
62    String expectedLambdaMethodName = "lambda$new$0";
63
64    void run() throws Exception {
65        List<String> sources = new ArrayList<>();
66
67        for (int i = 0; i < 3; i++) {
68            sources.add(String.format(lambdaSource, i));
69        }
70
71        ToolBox tb = new ToolBox();
72
73        try (ToolBox.MemoryFileManager fm = new ToolBox.MemoryFileManager()) {
74            tb.new JavacTask()
75              .sources(sources.toArray(new String[sources.size()]))
76              .fileManager(fm)
77              .run();
78
79            for (String file : fm.files.get(StandardLocation.CLASS_OUTPUT).keySet()) {
80                byte[] fileBytes = fm.getFileBytes(StandardLocation.CLASS_OUTPUT, file);
81                try (InputStream in = new ByteArrayInputStream(fileBytes)) {
82                    boolean foundLambdaMethod = false;
83                    ClassFile cf = ClassFile.read(in);
84                    StringBuilder seenMethods = new StringBuilder();
85                    String sep = "";
86                    for (Method m : cf.methods) {
87                        String methodName = m.getName(cf.constant_pool);
88                        if (expectedLambdaMethodName.equals(methodName)) {
89                            foundLambdaMethod = true;
90                            break;
91                        }
92                        seenMethods.append(sep);
93                        seenMethods.append(methodName);
94                        sep = ", ";
95                    }
96
97                    if (!foundLambdaMethod) {
98                        throw new AbstractMethodError("Did not find the lambda method, " +
99                                                      "found methods: " + seenMethods.toString());
100                    }
101                }
102            }
103        }
104    }
105}
106