5c58d27aac
Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Co-authored-by: Stefan Karlsson <stefan.karlsson@oracle.com> Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com> Co-authored-by: Tom Rodriguez <tom.rodriguez@oracle.com> Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
/*
|
|
* Copyright (c) 2001, 2012, 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/classLoaderData.hpp"
|
|
#include "memory/cardTableRS.hpp"
|
|
#include "memory/genRemSet.hpp"
|
|
|
|
// This kind of "BarrierSet" allows a "CollectedHeap" to detect and
|
|
// enumerate ref fields that have been modified (since the last
|
|
// enumeration.)
|
|
|
|
uintx GenRemSet::max_alignment_constraint(Name nm) {
|
|
switch (nm) {
|
|
case GenRemSet::CardTable:
|
|
return CardTableRS::ct_max_alignment_constraint();
|
|
default:
|
|
guarantee(false, "Unrecognized GenRemSet type.");
|
|
return (0); // Make Windows compiler happy
|
|
}
|
|
}
|
|
|
|
class HasAccumulatedModifiedOopsClosure : public KlassClosure {
|
|
bool _found;
|
|
public:
|
|
HasAccumulatedModifiedOopsClosure() : _found(false) {}
|
|
void do_klass(Klass* klass) {
|
|
if (_found) {
|
|
return;
|
|
}
|
|
|
|
if (klass->has_accumulated_modified_oops()) {
|
|
_found = true;
|
|
}
|
|
}
|
|
bool found() {
|
|
return _found;
|
|
}
|
|
};
|
|
|
|
bool KlassRemSet::mod_union_is_clear() {
|
|
HasAccumulatedModifiedOopsClosure closure;
|
|
ClassLoaderDataGraph::classes_do(&closure);
|
|
|
|
return !closure.found();
|
|
}
|
|
|
|
|
|
class ClearKlassModUnionClosure : public KlassClosure {
|
|
public:
|
|
void do_klass(Klass* klass) {
|
|
if (klass->has_accumulated_modified_oops()) {
|
|
klass->clear_accumulated_modified_oops();
|
|
}
|
|
}
|
|
};
|
|
|
|
void KlassRemSet::clear_mod_union() {
|
|
ClearKlassModUnionClosure closure;
|
|
ClassLoaderDataGraph::classes_do(&closure);
|
|
}
|