1 /*
   2  * Copyright (c) 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 8073956
  27  * @summary Tests C2 EA with allocated object escaping through a call.
  28  * @run main/othervm -XX:CompileCommand=dontinline,TestEscapeThroughInvoke::create TestEscapeThroughInvoke
  29  */
  30 public class TestEscapeThroughInvoke {
  31     private A a;
  32 
  33     public static void main(String[] args) {
  34         TestEscapeThroughInvoke test = new TestEscapeThroughInvoke();
  35         test.a = new A(42);
  36         // Make sure run gets compiled by C2
  37         for (int i = 0; i < 100_000; ++i) {
  38             test.run();
  39         }
  40     }
  41 
  42     private void run() {
  43         // Allocate something to trigger EA
  44         new Object();
  45         // Create a new escaping instance of A and
  46         // verify that it is always equal to 'a.saved'.
  47         A escapingA = create(42);
  48         a.check(escapingA);
  49     }
  50 
  51     // Create and return a new instance of A that escaped through 'A::saveInto'.
  52     // The 'dummy' parameters are needed to avoid EA skipping the methods.
  53     private A create(Integer dummy) {
  54         A result = new A(dummy);
  55         result.saveInto(a, dummy); // result escapes into 'a' here
  56         return result;
  57     }
  58 }
  59 
  60 class A {
  61     private A saved;
  62 
  63     public A(Integer dummy) { }
  64 
  65     public void saveInto(A other, Integer dummy) {
  66         other.saved = this;
  67     }
  68 
  69     public void check(A other) {
  70         if (this.saved != other) {
  71             throw new RuntimeException("TEST FAILED: Objects not equal.");
  72         }
  73     }
  74 }