1/*
2 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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.main
32 *          jdk.jdeps/com.sun.tools.javap
33 * @build toolbox.ToolBox toolbox.JavacTask
34 * @run main TestNonSerializableLambdaNameStability
35 */
36
37import java.io.ByteArrayInputStream;
38import java.io.InputStream;
39import java.util.ArrayList;
40import java.util.List;
41import javax.tools.StandardLocation;
42
43import com.sun.tools.classfile.ClassFile;
44import com.sun.tools.classfile.Method;
45
46import toolbox.JavacTask;
47import toolbox.ToolBox;
48
49public class TestNonSerializableLambdaNameStability {
50
51    public static void main(String... args) throws Exception {
52        new TestNonSerializableLambdaNameStability().run();
53    }
54
55    String lambdaSource = "public class L%d {\n" +
56                          "    public static class A {\n" +
57                          "        private Runnable r = () -> { };\n" +
58                          "    }\n" +
59                          "    public static class B {\n" +
60                          "        private Runnable r = () -> { };\n" +
61                          "    }\n" +
62                          "    private Runnable r = () -> { };\n" +
63                          "}\n";
64
65    String expectedLambdaMethodName = "lambda$new$0";
66
67    void run() throws Exception {
68        List<String> sources = new ArrayList<>();
69
70        for (int i = 0; i < 3; i++) {
71            sources.add(String.format(lambdaSource, i));
72        }
73
74        ToolBox tb = new ToolBox();
75
76        try (ToolBox.MemoryFileManager fm = new ToolBox.MemoryFileManager()) {
77            new JavacTask(tb)
78              .sources(sources.toArray(new String[sources.size()]))
79              .fileManager(fm)
80              .run();
81
82            for (String file : fm.getFileNames(StandardLocation.CLASS_OUTPUT)) {
83                byte[] fileBytes = fm.getFileBytes(StandardLocation.CLASS_OUTPUT, file);
84                try (InputStream in = new ByteArrayInputStream(fileBytes)) {
85                    boolean foundLambdaMethod = false;
86                    ClassFile cf = ClassFile.read(in);
87                    StringBuilder seenMethods = new StringBuilder();
88                    String sep = "";
89                    for (Method m : cf.methods) {
90                        String methodName = m.getName(cf.constant_pool);
91                        if (expectedLambdaMethodName.equals(methodName)) {
92                            foundLambdaMethod = true;
93                            break;
94                        }
95                        seenMethods.append(sep);
96                        seenMethods.append(methodName);
97                        sep = ", ";
98                    }
99
100                    if (!foundLambdaMethod) {
101                        throw new AbstractMethodError("Did not find the lambda method, " +
102                                                      "found methods: " + seenMethods.toString());
103                    }
104                }
105            }
106        }
107    }
108}
109