8006fe8f75
Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
79 lines
3.0 KiB
C++
79 lines
3.0 KiB
C++
/*
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* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "oops/markOop.hpp"
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#ifdef TARGET_OS_FAMILY_linux
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# include "thread_linux.inline.hpp"
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#endif
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#ifdef TARGET_OS_FAMILY_solaris
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# include "thread_solaris.inline.hpp"
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#endif
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#ifdef TARGET_OS_FAMILY_windows
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# include "thread_windows.inline.hpp"
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#endif
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void markOopDesc::print_on(outputStream* st) const {
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if (is_locked()) {
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st->print("locked(0x%lx)->", value());
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markOop(*(markOop*)value())->print_on(st);
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} else {
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assert(is_unlocked() || has_bias_pattern(), "just checking");
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st->print("mark(");
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if (has_bias_pattern()) st->print("biased,");
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st->print("hash %#lx,", hash());
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st->print("age %d)", age());
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}
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}
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// Give advice about whether the oop that contains this markOop
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// should be cached or not.
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bool markOopDesc::should_not_be_cached() const {
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// the cast is because decode_pointer() isn't marked const
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if (is_marked() && ((markOopDesc *)this)->decode_pointer() != NULL) {
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// If the oop containing this markOop is being forwarded, then
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// we are in the middle of GC and we do not want the containing
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// oop to be added to a cache. We have no way of knowing whether
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// the cache has already been visited by the current GC phase so
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// we don't know whether the forwarded oop will be properly
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// processed in this phase. If the forwarded oop is not properly
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// processed, then we'll see strange crashes or asserts during
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// the next GC run because the markOop will contain an unexpected
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// value.
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//
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// This situation has been seen when we are GC'ing a methodOop
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// because we use the methodOop while we're GC'ing it. Scary
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// stuff. Some of the uses the methodOop cause the methodOop to
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// be added to the OopMapCache in the instanceKlass as a side
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// effect. This check lets the cache maintainer know when a
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// cache addition would not be safe.
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return true;
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}
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// caching the containing oop should be just fine
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return false;
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}
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