Mercurial > hg > truffle
annotate test/compiler/6968348/Test6968348.java @ 3293:1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
Summary: In G1 heap verification, we no longer scan perm to G1-collected heap refs as part of process_strong_roots() but rather in a separate explicit oop iteration over the perm gen. This preserves the original perm card-marks. Added a new assertion in younger_refs_iterate() to catch a simple subcase where the user may have forgotten a prior save_marks() call, as happened in the case of G1's attempt to iterate perm to G1 refs when verifying the heap before exit. The assert was deliberately weakened for ParNew+CMS and will be fixed for that combination in a future CR. Also made some (non-G1) cleanups related to code and comments obsoleted by the migration of Symbols to the native heap.
Reviewed-by: iveresov, jmasa, tonyp
author | ysr |
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date | Tue, 26 Apr 2011 21:17:24 -0700 |
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1 /* |
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2 * Copyright (c) 2010, 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 /** |
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26 * @test |
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27 * @bug 6968348 |
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28 * @summary Byteswapped memory access can point to wrong location after JIT |
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29 * |
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30 * @run main Test6968348 |
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31 */ |
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32 |
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33 import sun.misc.Unsafe; |
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34 import java.lang.reflect.*; |
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35 |
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36 public class Test6968348 { |
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37 static Unsafe unsafe; |
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38 static final long[] buffer = new long[4096]; |
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39 static int array_long_base_offset; |
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40 |
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41 public static void main(String[] args) throws Exception { |
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42 Class c = Test6968348.class.getClassLoader().loadClass("sun.misc.Unsafe"); |
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43 Field f = c.getDeclaredField("theUnsafe"); |
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44 f.setAccessible(true); |
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45 unsafe = (Unsafe)f.get(c); |
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46 array_long_base_offset = unsafe.arrayBaseOffset(long[].class); |
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47 |
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48 for (int n = 0; n < 100000; n++) { |
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49 test(); |
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50 } |
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51 } |
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52 |
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53 public static void test() { |
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54 for (long i = array_long_base_offset; i < 4096; i += 8) { |
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55 unsafe.putLong(buffer, i, Long.reverseBytes(i)); |
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56 } |
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57 } |
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58 } |