| /* |
| * Copyright (c) 2017, 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 "memory/metaspaceClosure.hpp" |
| |
| // Update the reference to point to new_loc. |
| void MetaspaceClosure::Ref::update(address new_loc) const { |
| log_trace(cds)("Ref: [" PTR_FORMAT "] -> " PTR_FORMAT " => " PTR_FORMAT, |
| p2i(mpp()), p2i(obj()), p2i(new_loc)); |
| uintx p = (uintx)new_loc; |
| p |= flag_bits(); // Make sure the flag bits are copied to the new pointer. |
| *(address*)mpp() = (address)p; |
| } |
| |
| void MetaspaceClosure::push_impl(MetaspaceClosure::Ref* ref, Writability w) { |
| if (ref->not_null()) { |
| bool read_only; |
| switch (w) { |
| case _writable: |
| read_only = false; |
| break; |
| case _not_writable: |
| read_only = true; |
| break; |
| default: |
| assert(w == _default, "must be"); |
| read_only = ref->is_read_only_by_default(); |
| } |
| if (do_ref(ref, read_only)) { // true means we want to iterate the embedded pointer in <ref> |
| ref->metaspace_pointers_do(this); |
| } |
| } |
| } |
| |
| bool UniqueMetaspaceClosure::do_ref(MetaspaceClosure::Ref* ref, bool read_only) { |
| bool* found = _has_been_visited.get(ref->obj()); |
| if (found != NULL) { |
| assert(*found == read_only, "must be"); |
| return false; // Already visited: no need to iterate embedded pointers. |
| } else { |
| bool isnew = _has_been_visited.put(ref->obj(), read_only); |
| assert(isnew, "sanity"); |
| do_unique_ref(ref, read_only); |
| return true; // Saw this for the first time: iterate the embedded pointers. |
| } |
| } |