1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/classfile/metadataOnStackMark.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,73 @@
1.4 +/*
1.5 + * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "classfile/metadataOnStackMark.hpp"
1.30 +#include "code/codeCache.hpp"
1.31 +#include "compiler/compileBroker.hpp"
1.32 +#include "oops/metadata.hpp"
1.33 +#include "prims/jvmtiImpl.hpp"
1.34 +#include "runtime/synchronizer.hpp"
1.35 +#include "runtime/thread.hpp"
1.36 +#include "services/threadService.hpp"
1.37 +#include "utilities/growableArray.hpp"
1.38 +
1.39 +
1.40 +// Keep track of marked on-stack metadata so it can be cleared.
1.41 +GrowableArray<Metadata*>* _marked_objects = NULL;
1.42 +NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;)
1.43 +
1.44 +// Walk metadata on the stack and mark it so that redefinition doesn't delete
1.45 +// it. Class unloading also walks the previous versions and might try to
1.46 +// delete it, so this class is used by class unloading also.
1.47 +MetadataOnStackMark::MetadataOnStackMark() {
1.48 + assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1.49 + NOT_PRODUCT(_is_active = true;)
1.50 + if (_marked_objects == NULL) {
1.51 + _marked_objects = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(1000, true);
1.52 + }
1.53 + Threads::metadata_do(Metadata::mark_on_stack);
1.54 + CodeCache::alive_nmethods_do(nmethod::mark_on_stack);
1.55 + CompileBroker::mark_on_stack();
1.56 + JvmtiCurrentBreakpoints::metadata_do(Metadata::mark_on_stack);
1.57 + ThreadService::metadata_do(Metadata::mark_on_stack);
1.58 +}
1.59 +
1.60 +MetadataOnStackMark::~MetadataOnStackMark() {
1.61 + assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1.62 + // Unmark everything that was marked. Can't do the same walk because
1.63 + // redefine classes messes up the code cache so the set of methods
1.64 + // might not be the same.
1.65 + for (int i = 0; i< _marked_objects->length(); i++) {
1.66 + _marked_objects->at(i)->set_on_stack(false);
1.67 + }
1.68 + _marked_objects->clear(); // reuse growable array for next time.
1.69 + NOT_PRODUCT(_is_active = false;)
1.70 +}
1.71 +
1.72 +// Record which objects are marked so we can unmark the same objects.
1.73 +void MetadataOnStackMark::record(Metadata* m) {
1.74 + assert(_is_active, "metadata on stack marking is active");
1.75 + _marked_objects->push(m);
1.76 +}
