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72dc5721e0
Improve the usability of AppCDS Co-authored-by: Ioi Lam <ioi.lam@oracle.com> Co-authored-by: Jiangli Zhou <jianglizhou@google.com> Reviewed-by: acorn, jiangli, mseledtsov
98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
/*
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* Copyright (c) 2017, 2019, 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 "memory/metaspaceClosure.hpp"
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// Update the reference to point to new_loc.
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void MetaspaceClosure::Ref::update(address new_loc) const {
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log_trace(cds)("Ref: [" PTR_FORMAT "] -> " PTR_FORMAT " => " PTR_FORMAT,
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p2i(mpp()), p2i(obj()), p2i(new_loc));
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uintx p = (uintx)new_loc;
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p |= flag_bits(); // Make sure the flag bits are copied to the new pointer.
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*(address*)mpp() = (address)p;
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}
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void MetaspaceClosure::push_impl(MetaspaceClosure::Ref* ref) {
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if (_nest_level < MAX_NEST_LEVEL) {
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do_push(ref);
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delete ref;
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} else {
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ref->set_next(_pending_refs);
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_pending_refs = ref;
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}
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}
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void MetaspaceClosure::do_push(MetaspaceClosure::Ref* ref) {
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if (ref->not_null()) { // FIXME: make this configurable, so DynamicArchiveBuilder mark all pointers
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bool read_only;
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Writability w = ref->writability();
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switch (w) {
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case _writable:
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read_only = false;
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break;
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case _not_writable:
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read_only = true;
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break;
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default:
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assert(w == _default, "must be");
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read_only = ref->is_read_only_by_default();
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}
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_nest_level ++;
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if (do_ref(ref, read_only)) { // true means we want to iterate the embedded pointer in <ref>
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ref->metaspace_pointers_do(this);
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}
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_nest_level --;
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}
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}
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void MetaspaceClosure::finish() {
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assert(_nest_level == 0, "must be");
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while (_pending_refs != NULL) {
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Ref* ref = _pending_refs;
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_pending_refs = _pending_refs->next();
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do_push(ref);
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delete ref;
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}
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}
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MetaspaceClosure::~MetaspaceClosure() {
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assert(_pending_refs == NULL,
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"you must explicitly call MetaspaceClosure::finish() to process all refs!");
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}
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bool UniqueMetaspaceClosure::do_ref(MetaspaceClosure::Ref* ref, bool read_only) {
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bool* found = _has_been_visited.lookup(ref->obj());
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if (found != NULL) {
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assert(*found == read_only, "must be");
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return false; // Already visited: no need to iterate embedded pointers.
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} else {
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_has_been_visited.add(ref->obj(), read_only);
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if (_has_been_visited.maybe_grow(MAX_TABLE_SIZE)) {
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log_info(cds, hashtables)("Expanded _has_been_visited table to %d", _has_been_visited.table_size());
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}
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return do_unique_ref(ref, read_only);
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}
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}
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