jdk

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/*
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 * Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test
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 * @bug 6921495
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 * @summary spurious semicolons in class def cause empty NOPOS blocks
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 * @modules jdk.compiler
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 */
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import java.io.*;
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import java.net.*;
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import java.util.*;
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import javax.tools.*;
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import com.sun.source.util.*;
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public class ExtraSemiTest {
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    static class JavaSource extends SimpleJavaFileObject {
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        final static String source =
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                        "class C {\n" +
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                        "    int x;;\n" +
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                        "    class X { int i;; };\n" +
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                        "}";
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        JavaSource() {
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            super(URI.create("myfo:/C.java"), JavaFileObject.Kind.SOURCE);
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        }
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        @Override
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        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
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            return source;
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        }
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    }
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    public static void main(String... args) throws IOException {
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        new ExtraSemiTest().run();
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    }
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    void run() throws IOException {
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        File destDir = new File("classes"); destDir.mkdir();
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        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
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        JavaSource source = new JavaSource();
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        JavacTask ct = (JavacTask)tool.getTask(null, null, null,
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                Arrays.asList("-d", destDir.getPath(), "-XD-printsource"),
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                null,
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                Arrays.asList(source));
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        Boolean ok = ct.call();
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        if (!ok) throw new AssertionError("compilation failed");
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        String text = readFile(new File(destDir, "C.java"));
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        System.out.println(text);
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        // compress/canonicalize all whitespace
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        String canon = text.replaceAll("\\s+", " ");
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        System.out.println("canon: " + canon);
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        // There are no empty blocks in the original text.
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        // C will be given a default constructor "C() { super(); }" which
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        // does not have any empty blocks.
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        // The bug is that spurious semicolons in the class defn are parsed
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        // into redundant empty blocks in the tree, so verify there are
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        // no empty blocks in the -printsource output
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        if (canon.contains("{ }"))
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            throw new AssertionError("unexpected empty block found");
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    }
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    String readFile(File f) throws IOException {
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        int len = (int) f.length();
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        byte[] data = new byte[len];
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        try (DataInputStream in = new DataInputStream(new FileInputStream(f))) {
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            in.readFully(data);
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            return new String(data);
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        }
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    }
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}
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