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annotate test/compiler/7141637/SpreadNullArg.java @ 6611:7383557659bd

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7185699: G1: Prediction model discrepancies Summary: Correct the result value of G1CollectedHeap::pending_card_num(). Change the code that calculates the GC efficiency of a non-young heap region to use historical data from mixed GCs and the actual number of live bytes when predicting how long it would take to collect the region. Changes were also reviewed by Thomas Schatzl. Reviewed-by: azeemj, brutisso
author johnc
date Tue, 21 Aug 2012 14:10:39 -0700
parents 392a3f07d567
children 62084ffe573b
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1 /*
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2 * Copyright 2011 SAP AG. 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 SpreadNullArg
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26 * @bug 7141637
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27 * @summary verifies that the MethodHandle spread adapter can gracefully handle null arguments.
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28 * @run main SpreadNullArg
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29 * @author volker.simonis@gmail.com
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30 */
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31
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32 import java.lang.invoke.MethodHandle;
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33 import java.lang.invoke.MethodHandles;
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34 import java.lang.invoke.MethodType;
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35
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36 public class SpreadNullArg {
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37
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38 public static void main(String args[]) {
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39
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40 MethodType mt_ref_arg = MethodType.methodType(int.class, Integer.class);
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41 MethodHandle mh_spreadInvoker = MethodHandles.spreadInvoker(mt_ref_arg, 0);
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42 MethodHandle mh_spread_target;
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43 int result = 42;
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44
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45 try {
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46 mh_spread_target =
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47 MethodHandles.lookup().findStatic(SpreadNullArg.class, "target_spread_arg", mt_ref_arg);
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48 result = (int) mh_spreadInvoker.invokeExact(mh_spread_target, (Object[]) null);
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49 } catch(NullPointerException e) {
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50 // Expected exception - do nothing!
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51 } catch(Throwable e) {
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52 throw new Error(e);
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53 }
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54
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55 if (result != 42) throw new Error("Expected NullPointerException was not thrown");
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56 }
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57
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58 public static int target_spread_arg(Integer i1) {
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59 return i1.intValue();
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60 }
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61
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62 }