1 /*
   2  * Copyright (c) 2017, 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.
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  23 
  24 /* @test
  25  * @bug 8193222
  26  * @summary Check EnsureLocalCapacity doesn't shrink unexpectedly
  27  * @library /test/lib
  28  * @run main/othervm/native TestCheckedEnsureLocalCapacity launch
  29  */
  30 import jdk.test.lib.process.ProcessTools;
  31 import jdk.test.lib.process.OutputAnalyzer;
  32 
  33 public class TestCheckedEnsureLocalCapacity {
  34 
  35     static {
  36         System.loadLibrary("TestCheckedEnsureLocalCapacity");
  37     }
  38 
  39     // Calls EnsureLocalCapacity(capacity) and then creates "copies" number
  40     // of LocalRefs to "o".
  41     // If capacity > copies no warning should ensue (with the bug fixed).
  42     // If copies > capacity + warning-threshold then we still get a warning
  43     private static native void ensureCapacity(Object o, int capacity, int copies);
  44 
  45     private static int[][] testArgs = {
  46         { 60, 45 }, // good: capacity > copies
  47         { 1, 45 }   // bad: copies >> capacity
  48     };
  49 
  50     private static final String EXCEED_WARNING =
  51         "^WARNING: JNI local refs: \\d++, exceeds capacity:";
  52 
  53     private static final String WARNING = "^WARNING: ";
  54 
  55     public static void main(String[] args) throws Throwable {
  56         if (args.length == 2) {
  57             ensureCapacity(new Object(),
  58                            Integer.parseInt(args[0]),
  59                            Integer.parseInt(args[1]));
  60             return;
  61         }
  62 
  63         // No warning
  64         ProcessTools.executeTestJvm("-Xcheck:jni",
  65                                     "TestCheckedEnsureLocalCapacity",
  66                                     Integer.toString(testArgs[0][0]),
  67                                     Integer.toString(testArgs[0][1])).
  68             shouldHaveExitValue(0).
  69             // check no capacity warning
  70             stdoutShouldNotMatch(EXCEED_WARNING).
  71             // check no other warning
  72             stdoutShouldNotMatch(WARNING).
  73             reportDiagnosticSummary();
  74 
  75         //Warning
  76         ProcessTools.executeTestJvm("-Xcheck:jni",
  77                                     "TestCheckedEnsureLocalCapacity",
  78                                     Integer.toString(testArgs[1][0]),
  79                                     Integer.toString(testArgs[1][1])).
  80             shouldHaveExitValue(0).
  81             // check for capacity warning
  82             stdoutShouldMatch(EXCEED_WARNING).
  83             reportDiagnosticSummary();
  84     }
  85 }