| /* |
| * Copyright (c) 2014, 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 "jfr/leakprofiler/chains/edgeQueue.hpp" |
| #include "jfr/recorder/storage/jfrVirtualMemory.hpp" |
| |
| EdgeQueue::EdgeQueue(size_t reservation_size_bytes, size_t commit_block_size_bytes) : |
| _vmm(NULL), |
| _reservation_size_bytes(reservation_size_bytes), |
| _commit_block_size_bytes(commit_block_size_bytes), |
| _top_index(0), |
| _bottom_index(0) { |
| } |
| |
| bool EdgeQueue::initialize() { |
| assert(_reservation_size_bytes >= _commit_block_size_bytes, "invariant"); |
| assert(_vmm == NULL, "invariant"); |
| _vmm = new JfrVirtualMemory(); |
| return _vmm != NULL && _vmm->initialize(_reservation_size_bytes, _commit_block_size_bytes, sizeof(Edge)); |
| } |
| |
| EdgeQueue::~EdgeQueue() { |
| delete _vmm; |
| } |
| |
| void EdgeQueue::add(const Edge* parent, const oop* ref) { |
| assert(ref != NULL, "Null objects not allowed in EdgeQueue"); |
| assert(!is_full(), "EdgeQueue is full. Check is_full before adding another Edge"); |
| assert(!_vmm->is_full(), "invariant"); |
| void* const allocation = _vmm->new_datum(); |
| assert(allocation != NULL, "invariant"); |
| new (allocation)Edge(parent, ref); |
| _top_index++; |
| assert(_vmm->count() == _top_index, "invariant"); |
| } |
| |
| size_t EdgeQueue::top() const { |
| return _top_index; |
| } |
| |
| size_t EdgeQueue::bottom() const { |
| return EdgeQueue::_bottom_index; |
| } |
| |
| bool EdgeQueue::is_empty() const { |
| return _top_index == _bottom_index; |
| } |
| |
| bool EdgeQueue::is_full() const { |
| return _vmm->is_full(); |
| } |
| |
| const Edge* EdgeQueue::remove() const { |
| assert(!is_empty(), "EdgeQueue is empty. Check if empty before removing Edge"); |
| assert(!_vmm->is_empty(), "invariant"); |
| return (const Edge*)_vmm->get(_bottom_index++); |
| } |
| |
| const Edge* EdgeQueue::element_at(size_t index) const { |
| assert(index >= _bottom_index, "invariant"); |
| assert(index <_top_index, "invariant"); |
| return (Edge*)_vmm->get(index); |
| } |
| |
| size_t EdgeQueue::reserved_size() const { |
| assert(_vmm != NULL, "invariant"); |
| return _vmm->reserved_size(); |
| } |
| |
| size_t EdgeQueue::live_set() const { |
| assert(_vmm != NULL, "invariant"); |
| return _vmm->live_set(); |
| } |
| |
| size_t EdgeQueue::sizeof_edge() const { |
| assert(_vmm != NULL, "invariant"); |
| return _vmm->aligned_datum_size_bytes(); |
| } |