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annotate src/share/vm/oops/markOop.cpp @ 1552:c18cbe5936b8

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6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
author trims
date Thu, 27 May 2010 19:08:38 -0700
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children f95d63e2154a
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1 /*
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2 * Copyright (c) 1997, 2008, 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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25 # include "incls/_precompiled.incl"
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26 # include "incls/_markOop.cpp.incl"
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29 void markOopDesc::print_on(outputStream* st) const {
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30 if (is_locked()) {
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31 st->print("locked(0x%lx)->", value());
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32 markOop(*(markOop*)value())->print_on(st);
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33 } else {
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34 assert(is_unlocked() || has_bias_pattern(), "just checking");
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35 st->print("mark(");
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36 if (has_bias_pattern()) st->print("biased,");
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37 st->print("hash %#lx,", hash());
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38 st->print("age %d)", age());
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39 }
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40 }
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43 // Give advice about whether the oop that contains this markOop
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44 // should be cached or not.
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45 bool markOopDesc::should_not_be_cached() const {
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46 // the cast is because decode_pointer() isn't marked const
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47 if (is_marked() && ((markOopDesc *)this)->decode_pointer() != NULL) {
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48 // If the oop containing this markOop is being forwarded, then
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49 // we are in the middle of GC and we do not want the containing
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50 // oop to be added to a cache. We have no way of knowing whether
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51 // the cache has already been visited by the current GC phase so
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52 // we don't know whether the forwarded oop will be properly
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53 // processed in this phase. If the forwarded oop is not properly
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54 // processed, then we'll see strange crashes or asserts during
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55 // the next GC run because the markOop will contain an unexpected
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56 // value.
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57 //
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58 // This situation has been seen when we are GC'ing a methodOop
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59 // because we use the methodOop while we're GC'ing it. Scary
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60 // stuff. Some of the uses the methodOop cause the methodOop to
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61 // be added to the OopMapCache in the instanceKlass as a side
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62 // effect. This check lets the cache maintainer know when a
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63 // cache addition would not be safe.
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64 return true;
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65 }
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66
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67 // caching the containing oop should be just fine
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68 return false;
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69 }