1 /*
   2  * Copyright (c) 2011, 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 7192246
  27  * @summary  check that javac does not generate bridge methods for defaults
  28  * @modules jdk.jdeps/com.sun.tools.classfile
  29  */
  30 
  31 import com.sun.tools.classfile.ClassFile;
  32 import com.sun.tools.classfile.ConstantPool.*;
  33 import com.sun.tools.classfile.Method;
  34 
  35 import java.io.*;
  36 
  37 public class TestNoBridgeOnDefaults {
  38 
  39     interface A<X> {
  40         default <Y> A<X> m(X x, Y y) { return Impl.<X,Y>m1(this, x, y); }
  41     }
  42 
  43     static abstract class B<X> implements A<X> { }
  44 
  45     interface C<X> extends A<X> {
  46         default <Y> C<X> m(X x, Y y) { return Impl.<X,Y>m2(this, x, y); }
  47     }
  48 
  49     static abstract class D<X> extends B<X> implements C<X> { }
  50 
  51     static class Impl {
  52        static <X, Y> A<X> m1(A<X> rec, X x, Y y) { return null; }
  53        static <X, Y> C<X> m2(C<X> rec, X x, Y y) { return null; }
  54     }
  55 
  56     static final String[] SUBTEST_NAMES = { B.class.getName() + ".class", D.class.getName() + ".class" };
  57     static final String TEST_METHOD_NAME = "m";
  58 
  59     public static void main(String... args) throws Exception {
  60         new TestNoBridgeOnDefaults().run();
  61     }
  62 
  63     public void run() throws Exception {
  64         String workDir = System.getProperty("test.classes");
  65         for (int i = 0 ; i < SUBTEST_NAMES.length ; i ++) {
  66             File compiledTest = new File(workDir, SUBTEST_NAMES[i]);
  67             checkNoBridgeOnDefaults(compiledTest);
  68         }
  69     }
  70 
  71     void checkNoBridgeOnDefaults(File f) {
  72         System.err.println("check: " + f);
  73         try {
  74             ClassFile cf = ClassFile.read(f);
  75             for (Method m : cf.methods) {
  76                 String mname = m.getName(cf.constant_pool);
  77                 if (mname.equals(TEST_METHOD_NAME)) {
  78                     throw new Error("unexpected bridge method found " + m);
  79                 }
  80             }
  81         } catch (Exception e) {
  82             e.printStackTrace();
  83             throw new Error("error reading " + f +": " + e);
  84         }
  85     }
  86 }