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annotate src/share/vm/oops/markOop.cpp @ 4155:394404b2d9bd

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Removed strict requirement for GRAAL environment variable. It only needs to be set now if the graal directory is not in the directory hierarchy of GraalVM JDK.
author Doug Simon <doug.simon@oracle.com>
date Wed, 21 Dec 2011 11:25:27 +0100
parents f08d439fab8c
children da91efe96a93
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1 /*
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2 * Copyright (c) 1997, 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 #include "precompiled.hpp"
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26 #include "oops/markOop.hpp"
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27 #ifdef TARGET_OS_FAMILY_linux
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28 # include "thread_linux.inline.hpp"
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29 #endif
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30 #ifdef TARGET_OS_FAMILY_solaris
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31 # include "thread_solaris.inline.hpp"
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32 #endif
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33 #ifdef TARGET_OS_FAMILY_windows
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34 # include "thread_windows.inline.hpp"
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35 #endif
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36 #ifdef TARGET_OS_FAMILY_bsd
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37 # include "thread_bsd.inline.hpp"
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38 #endif
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41 void markOopDesc::print_on(outputStream* st) const {
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42 if (is_locked()) {
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43 st->print("locked(0x%lx)->", value());
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44 markOop(*(markOop*)value())->print_on(st);
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45 } else {
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46 assert(is_unlocked() || has_bias_pattern(), "just checking");
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47 st->print("mark(");
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48 if (has_bias_pattern()) st->print("biased,");
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49 st->print("hash %#lx,", hash());
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50 st->print("age %d)", age());
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51 }
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52 }
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55 // Give advice about whether the oop that contains this markOop
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56 // should be cached or not.
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57 bool markOopDesc::should_not_be_cached() const {
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58 // the cast is because decode_pointer() isn't marked const
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59 if (is_marked() && ((markOopDesc *)this)->decode_pointer() != NULL) {
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60 // If the oop containing this markOop is being forwarded, then
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61 // we are in the middle of GC and we do not want the containing
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62 // oop to be added to a cache. We have no way of knowing whether
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63 // the cache has already been visited by the current GC phase so
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64 // we don't know whether the forwarded oop will be properly
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65 // processed in this phase. If the forwarded oop is not properly
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66 // processed, then we'll see strange crashes or asserts during
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67 // the next GC run because the markOop will contain an unexpected
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68 // value.
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69 //
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70 // This situation has been seen when we are GC'ing a methodOop
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71 // because we use the methodOop while we're GC'ing it. Scary
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72 // stuff. Some of the uses the methodOop cause the methodOop to
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73 // be added to the OopMapCache in the instanceKlass as a side
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74 // effect. This check lets the cache maintainer know when a
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75 // cache addition would not be safe.
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76 return true;
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77 }
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78
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79 // caching the containing oop should be just fine
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80 return false;
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81 }