1 /*
   2  * Copyright (c) 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 8206986
  27  * @summary Verify various corner cases with nested switch expressions.
  28  * @compile --enable-preview -source 12 ExpressionSwitchBugs.java
  29  * @run main/othervm --enable-preview ExpressionSwitchBugs
  30  */
  31 
  32 public class ExpressionSwitchBugs {
  33     public static void main(String... args) {
  34         new ExpressionSwitchBugs().testNested();
  35     }
  36 
  37     private void testNested() {
  38         int i = 0;
  39         check(42, id(switch (42) {
  40             default: i++; break 42;
  41         }));
  42         i = 0;
  43         check(43, id(switch (42) {
  44             case 42: while (i == 0) {
  45                 i++;
  46             }
  47             break 42 + i;
  48             default: i++; break 42;
  49         }));
  50         i = 0;
  51         check(42, id(switch (42) {
  52             case 42: if (i == 0) {
  53                 break 42;
  54             }
  55             default: i++; break 43;
  56         }));
  57         i = 0;
  58         check(42, id(switch (42) {
  59             case 42: if (i == 0) {
  60                 break 41 + switch (0) {
  61                     case 0 -> 1;
  62                     default -> -1;
  63                 };
  64             }
  65             default: i++; break 43;
  66         }));
  67     }
  68 
  69     private int id(int i) {
  70         return i;
  71     }
  72 
  73     private int id(Object o) {
  74         return -1;
  75     }
  76 
  77     private void check(int actual, int expected) {
  78         if (actual != expected) {
  79             throw new AssertionError("Unexpected result: " + actual);
  80         }
  81     }
  82 }