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 1
  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$Inner1",
  60         expectedMethods = {"<init>(BridgeMethodsForLambdaTest)", "function()", "run()"},
  61         expectedFields = "lambda1",
  62         expectedNumberOfSyntheticMethods = 4,
  63         expectedNumberOfSyntheticFields = 1)
  64 @ExpectedClass(className = "BridgeMethodsForLambdaTest$Inner2",
  65         expectedMethods = {"<init>()", "staticFunction()"},
  66         expectedFields = "lambda1",
  67         expectedNumberOfSyntheticMethods = 3)
  68 @ExpectedClass(className = "BridgeMethodsForLambdaTest$Inner3",
  69         expectedMethods = {"<init>(BridgeMethodsForLambdaTest)", "function()"},
  70         expectedNumberOfSyntheticMethods = 1,
  71         expectedNumberOfSyntheticFields = 1)
  72 @ExpectedClass(className = "BridgeMethodsForLambdaTest$Inner4",
  73         expectedMethods = {"<init>(BridgeMethodsForLambdaTest)", "function()"},
  74         expectedNumberOfSyntheticMethods = 1,
  75         expectedNumberOfSyntheticFields = 1)
  76 public class BridgeMethodsForLambdaTest {
  77 
  78     private class Inner1 implements Runnable {
  79         private Inner1() {
  80         }
  81         private Runnable lambda1 = () -> {
  82         };
  83         private void function() {
  84         }
  85         @Override
  86         public void run() {
  87         }
  88     }
  89 
  90     private static class Inner2 {
  91         private Runnable lambda1 = () -> {
  92         };
  93         private static void staticFunction() {
  94         }
  95     }
  96 
  97     private class Inner3 {
  98         public void function() {
  99         }
 100     }
 101 
 102     private class Inner4 extends Inner3 {
 103         @Override
 104         public void function() {
 105             Runnable r = super::function;
 106         }
 107     }
 108 
 109     private static int function(Integer...vararg) {
 110         return 0;
 111     }
 112 
 113     {
 114         Inner1 inner = new Inner1();
 115         Runnable l1 = inner::function;
 116         Runnable l2 = Inner1::new;
 117         inner.lambda1 = inner::function;
 118         Comparator<Integer> c = BridgeMethodsForLambdaTest::function;
 119         IntStream.of(2).mapToObj(int[]::new);
 120     }
 121 
 122     static {
 123         Inner2 inner = new Inner2();
 124         Runnable l1 = Inner2::staticFunction;
 125     }
 126 }