99039568f9
Added on_stack bit to flags. Also MetadataMarkOnStack is used for more than JVMTI so had to be moved. Reviewed-by: dholmes, stefank
70 lines
2.8 KiB
C++
70 lines
2.8 KiB
C++
/*
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* Copyright (c) 2013, 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 "classfile/metadataOnStackMark.hpp"
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#include "code/codeCache.hpp"
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#include "compiler/compileBroker.hpp"
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#include "oops/metadata.hpp"
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#include "runtime/synchronizer.hpp"
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#include "runtime/thread.hpp"
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#include "utilities/growableArray.hpp"
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// Keep track of marked on-stack metadata so it can be cleared.
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GrowableArray<Metadata*>* _marked_objects = NULL;
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NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;)
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// Walk metadata on the stack and mark it so that redefinition doesn't delete
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// it. Class unloading also walks the previous versions and might try to
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// delete it, so this class is used by class unloading also.
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MetadataOnStackMark::MetadataOnStackMark() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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NOT_PRODUCT(_is_active = true;)
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if (_marked_objects == NULL) {
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_marked_objects = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(1000, true);
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}
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Threads::metadata_do(Metadata::mark_on_stack);
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CodeCache::alive_nmethods_do(nmethod::mark_on_stack);
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CompileBroker::mark_on_stack();
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}
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MetadataOnStackMark::~MetadataOnStackMark() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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// Unmark everything that was marked. Can't do the same walk because
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// redefine classes messes up the code cache so the set of methods
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// might not be the same.
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for (int i = 0; i< _marked_objects->length(); i++) {
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_marked_objects->at(i)->set_on_stack(false);
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}
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_marked_objects->clear(); // reuse growable array for next time.
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NOT_PRODUCT(_is_active = false;)
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}
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// Record which objects are marked so we can unmark the same objects.
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void MetadataOnStackMark::record(Metadata* m) {
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assert(_is_active, "metadata on stack marking is active");
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_marked_objects->push(m);
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}
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