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22876
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1 /*
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2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /**
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25 * @test
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26 * @bug 8073956
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27 * @summary Tests C2 EA with allocated object escaping through a call.
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28 * @run main/othervm -XX:CompileCommand=dontinline,TestEscapeThroughInvoke::create TestEscapeThroughInvoke
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29 */
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30 public class TestEscapeThroughInvoke {
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31 private A a;
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32
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33 public static void main(String[] args) {
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34 TestEscapeThroughInvoke test = new TestEscapeThroughInvoke();
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35 test.a = new A(42);
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36 // Make sure run gets compiled by C2
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37 for (int i = 0; i < 100_000; ++i) {
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38 test.run();
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39 }
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40 }
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41
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42 private void run() {
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43 // Allocate something to trigger EA
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44 new Object();
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45 // Create a new escaping instance of A and
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46 // verify that it is always equal to 'a.saved'.
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47 A escapingA = create(42);
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48 a.check(escapingA);
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49 }
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50
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51 // Create and return a new instance of A that escaped through 'A::saveInto'.
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52 // The 'dummy' parameters are needed to avoid EA skipping the methods.
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53 private A create(Integer dummy) {
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54 A result = new A(dummy);
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55 result.saveInto(a, dummy); // result escapes into 'a' here
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56 return result;
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57 }
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58 }
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59
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60 class A {
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61 private A saved;
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62
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63 public A(Integer dummy) { }
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64
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65 public void saveInto(A other, Integer dummy) {
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66 other.saved = this;
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67 }
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68
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69 public void check(A other) {
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70 if (this.saved != other) {
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71 throw new RuntimeException("TEST FAILED: Objects not equal.");
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72 }
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73 }
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74 }
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