/*
* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "classfile/classLoaderDataGraph.hpp"
#include "jfr/leakprofiler/utilities/saveRestore.hpp"
#include "oops/oop.inline.hpp"
MarkWordContext::MarkWordContext() : _obj(NULL), _mark_word(markWord::zero()) {}
MarkWordContext::MarkWordContext(const oop obj) : _obj(obj), _mark_word(obj->mark()) {
assert(_obj->mark() == _mark_word, "invariant");
// now we will "poison" the mark word of the object
// to the intermediate monitor INFLATING state.
// This is an "impossible" state during a safepoint,
// hence we will use it to quickly identify objects
// during the reachability search from gc roots.
assert(markWord::zero() == markWord::INFLATING(), "invariant");
_obj->set_mark(markWord::INFLATING());
assert(markWord::zero() == obj->mark(), "invariant");
}
MarkWordContext::~MarkWordContext() {
if (_obj != NULL) {
_obj->set_mark(_mark_word);
assert(_obj->mark() == _mark_word, "invariant");
}
}
MarkWordContext::MarkWordContext(const MarkWordContext& rhs) : _obj(NULL), _mark_word(markWord::zero()) {
swap(const_cast<MarkWordContext&>(rhs));
}
void MarkWordContext::operator=(MarkWordContext rhs) {
swap(rhs);
}
void MarkWordContext::swap(MarkWordContext& rhs) {
oop temp_obj = rhs._obj;
markWord temp_mark_word = rhs._mark_word;
rhs._obj = _obj;
rhs._mark_word = _mark_word;
_obj = temp_obj;
_mark_word = temp_mark_word;
}
CLDClaimContext::CLDClaimContext() : _cld(NULL) {}
CLDClaimContext::CLDClaimContext(ClassLoaderData* cld) : _cld(cld) {
assert(_cld->claimed(), "invariant");
_cld->clear_claim();
}
CLDClaimContext::~CLDClaimContext() {
if (_cld != NULL) {
_cld->try_claim(ClassLoaderData::_claim_strong);
assert(_cld->claimed(), "invariant");
}
}
CLDClaimContext::CLDClaimContext(const CLDClaimContext& rhs) : _cld(NULL) {
swap(const_cast<CLDClaimContext&>(rhs));
}
void CLDClaimContext::operator=(CLDClaimContext rhs) {
swap(rhs);
}
void CLDClaimContext::swap(CLDClaimContext& rhs) {
ClassLoaderData* temp_cld = rhs._cld;
rhs._cld = _cld;
_cld = temp_cld;
}
CLDClaimStateClosure::CLDClaimStateClosure() : CLDClosure(), _state() {}
void CLDClaimStateClosure::do_cld(ClassLoaderData* cld) {
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