1 /*
   2  * Copyright (c) 2015, 2018, 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 8044537 8200301
  27  * @summary Checking ACC_SYNTHETIC flag is generated for bridge method
  28  *          generated for lambda expressions and method references.
  29  * @modules jdk.compiler/com.sun.tools.javac.api
  30  *          jdk.compiler/com.sun.tools.javac.main
  31  *          jdk.jdeps/com.sun.tools.classfile
  32  * @library /tools/lib /tools/javac/lib ../lib
  33  * @build toolbox.ToolBox InMemoryFileManager TestResult TestBase
  34  * @build SyntheticTestDriver ExpectedClass ExpectedClasses
  35  * @compile -XDdeduplicateLambdas=false BridgeMethodsForLambdaTest.java
  36  * @run main SyntheticTestDriver BridgeMethodsForLambdaTest
  37  */
  38 
  39 import java.util.Comparator;
  40 import java.util.stream.IntStream;
  41 
  42 /**
  43  * Synthetic members:
  44  * 1. inner class for Inner1.
  45  * 2. method for () -> {} in Inner1
  46  * 3. method for () -> {} in Inner2
  47  * 4. method references to private methods.
  48  * 5. method for super::function()
  49  * 6. method references to private static methods.
  50  * 7. access method for private method function().
  51  * 8. access method for private static method staticFunction().
  52  * 9. method reference to vararg method.
  53  * 10. method reference to array's method.
  54  * 11. constructors for Inner1 and Inner2.
  55  */
  56 @ExpectedClass(className = "BridgeMethodsForLambdaTest",
  57         expectedMethods = {"<init>()", "<clinit>()", "function(java.lang.Integer[])"},
  58         expectedNumberOfSyntheticMethods = 6)
  59 @ExpectedClass(className = "BridgeMethodsForLambdaTest$Inner1",
  60         expectedMethods = {"<init>(BridgeMethodsForLambdaTest)", "function()", "run()"},
  61         expectedFields = "lambda1",
  62         expectedNumberOfSyntheticMethods = 1,
  63         expectedNumberOfSyntheticFields = 1)
  64 @ExpectedClass(className = "BridgeMethodsForLambdaTest$Inner2",
  65         expectedMethods = {"<init>()", "staticFunction()"},
  66         expectedFields = "lambda1",
  67         expectedNumberOfSyntheticMethods = 1)
  68 @ExpectedClass(className = "BridgeMethodsForLambdaTest$Inner3",
  69         expectedMethods = {"<init>(BridgeMethodsForLambdaTest)", "function()"},
  70         expectedNumberOfSyntheticFields = 1)
  71 @ExpectedClass(className = "BridgeMethodsForLambdaTest$Inner4",
  72         expectedMethods = {"<init>(BridgeMethodsForLambdaTest)", "function()"},
  73         expectedNumberOfSyntheticMethods = 1,
  74         expectedNumberOfSyntheticFields = 1)
  75 public class BridgeMethodsForLambdaTest {
  76 
  77     private class Inner1 implements Runnable {
  78         private Inner1() {
  79         }
  80         private Runnable lambda1 = () -> {
  81         };
  82         private void function() {
  83         }
  84         @Override
  85         public void run() {
  86         }
  87     }
  88 
  89     private static class Inner2 {
  90         private Runnable lambda1 = () -> {
  91         };
  92         private static void staticFunction() {
  93         }
  94     }
  95 
  96     private class Inner3 {
  97         public void function() {
  98         }
  99     }
 100 
 101     private class Inner4 extends Inner3 {
 102         @Override
 103         public void function() {
 104             Runnable r = super::function;
 105         }
 106     }
 107 
 108     private static int function(Integer...vararg) {
 109         return 0;
 110     }
 111 
 112     {
 113         Inner1 inner = new Inner1();
 114         Runnable l1 = inner::function;
 115         Runnable l2 = Inner1::new;
 116         inner.lambda1 = inner::function;
 117         Comparator<Integer> c = BridgeMethodsForLambdaTest::function;
 118         IntStream.of(2).mapToObj(int[]::new);
 119     }
 120 
 121     static {
 122         Inner2 inner = new Inner2();
 123         Runnable l1 = Inner2::staticFunction;
 124     }
 125 }