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annotate src/share/vm/runtime/prefetch.hpp @ 1721:413ad0331a0c

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6977924: Changes for 6975078 produce build error with certain gcc versions Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error. Reviewed-by: jcoomes, ysr, phh
author johnc
date Wed, 18 Aug 2010 10:59:06 -0700
parents c18cbe5936b8
children f95d63e2154a
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1 /*
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2 * Copyright (c) 2003, 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 // If calls to prefetch methods are in a loop, the loop should be cloned
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26 // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval
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27 // say not to do prefetching, these methods aren't called. At the very
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28 // least, they take up a memory issue slot. They should be implemented
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29 // as inline assembly code: doing an actual call isn't worth the cost.
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30
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31 class Prefetch : AllStatic {
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32 public:
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33 enum style {
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34 do_none, // Do no prefetching
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35 do_read, // Do read prefetching
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36 do_write // Do write prefetching
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37 };
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38
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39 // Prefetch anticipating read; must not fault, semantically a no-op
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40 static void read(void* loc, intx interval);
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41
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42 // Prefetch anticipating write; must not fault, semantically a no-op
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43 static void write(void* loc, intx interval);
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44 };