jdk8-mips64-public/langtools: test/tools/javac/lambda/LambdaConv01.java@c09b7234cded (annotated)

test/tools/javac/lambda/LambdaConv01.java@c09b7234cded (annotated)

test/tools/javac/lambda/LambdaConv01.java

Tue, 14 May 2013 11:11:09 -0700

author: rfield
date: Tue, 14 May 2013 11:11:09 -0700
changeset 1752: c09b7234cded
parent 1415: 01c9d4161882
child 1869: 5c548a8542b8
permissions: -rw-r--r--

8012556: Implement lambda methods on interfaces as static
8006140: Javac NPE compiling Lambda expression on initialization expression of static field in interface
Summary: Lambdas occurring in static contexts or those not needing instance information should be generated into static methods. This has long been the case for classes. However, as a work-around to the lack of support for statics on interfaces, interface lambda methods have been generated into default methods. For lambdas in interface static contexts (fields and static methods) this causes an NPE in javac because there is no 'this'. MethodHandles now support static methods on interfaces. This changeset allows lambda methods to be generated as static interface methods. An existing bug in Hotspot (8013875) is exposed in a test when the "-esa" flag is used. This test and another test that already exposed this bug have been marked with @ignore.
Reviewed-by: mcimadamore

 /*
  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 /*
  * @test
  * @bug 8003280
  * @summary Add lambda tests
  *  basic test for lambda conversion
  * @author  Brian Goetz
  * @author  Maurizio Cimadamore
  * @run main LambdaConv01
  */
 public class LambdaConv01 {
     static int assertionCount = 0;
     static void assertTrue(boolean cond) {
         assertionCount++;
         if (!cond)
             throw new AssertionError();
     }
     interface IntToInt {
       public int foo(int x);
     }
     interface IntToVoid {
       public void foo(int x);
     }
     interface VoidToInt {
       public int foo();
     }
     interface TU<T, U> {
       public T foo(U u);
     }
     public static <T, U> T exec(TU<T, U> lambda, U x) {
         return lambda.foo(x);
     }
     static {
         //Assignment conversion:
         VoidToInt f1 = ()-> 3;
         assertTrue(3 == f1.foo());
         //Covariant returns:
         TU<Number, Integer> f2 = (Integer x) -> x;
         assertTrue(3 == f2.foo(3));
         //Method resolution with boxing:
         int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);
         assertTrue(3 == res);
         //Runtime exception transparency:
         try {
             LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);
         }
         catch (RuntimeException e) {
             assertTrue(true);
         }
     }
     {
         //Assignment conversion:
         VoidToInt f1 = ()-> 3;
         assertTrue(3 == f1.foo());
         //Covariant returns:
         TU<Number, Integer> f2 = (Integer x) -> x;
         assertTrue(3 == f2.foo(3));
         //Method resolution with boxing:
         int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);
         assertTrue(3 == res);
         //Runtime exception transparency:
         try {
             LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);
         }
         catch (RuntimeException e) {
             assertTrue(true);
         }
     }
     public static void test1() {
         //Assignment conversion:
         VoidToInt f1 = ()-> 3;
         assertTrue(3 == f1.foo());
         //Covariant returns:
         TU<Number, Integer> f2 = (Integer x) -> x;
         assertTrue(3 == f2.foo(3));
         //Method resolution with boxing:
         int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);
         assertTrue(3 == res);
         //Runtime exception transparency:
         try {
             LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);
         }
         catch (RuntimeException e) {
             assertTrue(true);
         }
     }
     public void test2() {
         //Assignment conversion:
         VoidToInt f1 = ()-> 3;
         assertTrue(3 == f1.foo());
         //Covariant returns:
         TU<Number, Integer> f2 = (Integer x) -> x;
         assertTrue(3 == f2.foo(3));
         //Method resolution with boxing:
         int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);
         assertTrue(3 == res);
         //Runtime exception transparency:
         try {
             LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);
         }
         catch (RuntimeException e) {
             assertTrue(true);
         }
     }
     public static void main(String[] args) {
         test1();
         new LambdaConv01().test2();
         assertTrue(assertionCount == 16);
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

test/tools/javac/lambda/LambdaConv01.java@c09b7234cded (annotated)

test/tools/javac/lambda/LambdaConv01.java