AvoidInfiniteReattribution.java revision 2895:ec37a85dbd97 
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 8077605
27 * @summary Check that when an exception occurs during Attr.visitLambda, an attempt to attribute
28            the lambda again is avoided rather than falling into an infinite recursion.
29 */
30
31import java.io.IOException;
32import java.net.URI;
33import java.util.Arrays;
34import java.util.List;
35import javax.tools.JavaFileObject;
36import javax.tools.SimpleJavaFileObject;
37
38import com.sun.tools.javac.api.JavacTaskImpl;
39import com.sun.tools.javac.api.JavacTool;
40import com.sun.tools.javac.comp.Attr;
41import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
42import com.sun.tools.javac.util.Context;
43import com.sun.tools.javac.util.Context.Factory;
44
45public class AvoidInfiniteReattribution {
46
47    public static void main(String... args) throws Exception {
48        new AvoidInfiniteReattribution().run();
49    }
50
51    void run() throws IOException {
52        JavacTool tool = JavacTool.create();
53        JavaSource source = new JavaSource("class Test {" +
54                                           "    I i = STOP -> {};" +
55                                           "    interface I {" +
56                                           "        public void test(int i) {}" +
57                                           "    }" +
58                                           "}");
59        Context context = new Context();
60        CrashingAttr.preRegister(context);
61        List<JavaSource> inputs = Arrays.asList(source);
62        JavacTaskImpl task =
63                (JavacTaskImpl) tool.getTask(null, null, null, null, null, inputs, context);
64        try {
65            task.analyze(null);
66            throw new AssertionError("Expected exception not seen.");
67        } catch (StopException ex) {
68            //ok
69        }
70    }
71
72    static class CrashingAttr extends Attr {
73
74        static void preRegister(Context context) {
75            context.put(attrKey, (Factory<Attr>) c -> new CrashingAttr(c));
76        }
77
78        CrashingAttr(Context context) {
79            super(context);
80        }
81
82        @Override public void visitVarDef(JCVariableDecl tree) {
83            if (tree.name.contentEquals("STOP"))
84                throw new StopException();
85            super.visitVarDef(tree);
86        }
87    }
88
89    static class StopException extends NullPointerException {}
90
91    class JavaSource extends SimpleJavaFileObject {
92
93        String source;
94
95        JavaSource(String source) {
96            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
97            this.source = source;
98        }
99
100        @Override
101        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
102            return source;
103        }
104
105    }
106
107}
108