2009ecbeb1
this is a false positve, but perhaps we can help coverity work it out properly with some constexpr Change-Id: I8398153d6678585dacf4acaf7081ec32094bcda6 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/174150 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#pragma once
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#include <sal/config.h>
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#include <memory>
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#include <sal/types.h>
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#include <store/types.h>
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#include "object.hxx"
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namespace rtl { template <class reference_type> class Reference; }
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namespace store { struct PageData; }
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namespace store
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{
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struct Entry;
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class PageCache :
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public store::OStoreObject
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{
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static size_t constexpr theTableSize = 32;
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static_assert((theTableSize & (theTableSize-1)) == 0, "table size should be a power of 2");
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Entry ** m_hash_table;
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Entry * m_hash_table_0[theTableSize] = {};
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size_t m_hash_size;
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size_t m_hash_shift;
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size_t const m_page_shift;
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size_t m_hash_entries; // total number of entries in table.
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size_t m_nHit;
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size_t m_nMissed;
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static int hash_Impl(sal_uInt32 a, size_t s, size_t q, size_t m)
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{
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return static_cast<int>(((a + (a >> s) + (a >> (s << 1))) >> q) & m);
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}
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int hash_index_Impl (sal_uInt32 nOffset)
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{
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return hash_Impl(nOffset, m_hash_shift, m_page_shift, m_hash_size - 1);
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}
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Entry * lookup_Impl (Entry * entry, sal_uInt32 nOffset);
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void rescale_Impl (std::size_t new_size);
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public:
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explicit PageCache (sal_uInt16 nPageSize);
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PageCache(const PageCache&) = delete;
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PageCache& operator=(const PageCache&) = delete;
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storeError lookupPageAt (
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std::shared_ptr<PageData> & rxPage,
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sal_uInt32 nOffset);
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storeError insertPageAt (
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std::shared_ptr<PageData> const & rxPage,
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sal_uInt32 nOffset);
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storeError updatePageAt (
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std::shared_ptr<PageData> const & rxPage,
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sal_uInt32 nOffset);
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storeError removePageAt (
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sal_uInt32 nOffset);
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protected:
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virtual ~PageCache() override;
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};
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storeError PageCache_createInstance (
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rtl::Reference< store::PageCache > & rxCache,
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sal_uInt16 nPageSize
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);
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} // namespace store
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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