2009-07-07 00:49:47 +02:00
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/*
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* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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2010-04-02 20:20:32 +02:00
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#include "base/intmath.hh"
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#include "base/str.hh"
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2010-03-23 02:43:53 +01:00
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#include "mem/ruby/filters/BlockBloomFilter.hh"
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2011-02-26 00:51:56 +01:00
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#include "mem/ruby/system/System.hh"
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2009-07-07 00:49:47 +02:00
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2010-04-02 20:20:32 +02:00
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using namespace std;
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2009-07-07 00:49:47 +02:00
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BlockBloomFilter::BlockBloomFilter(string str)
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{
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2010-04-02 20:20:32 +02:00
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string head, tail;
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#ifndef NDEBUG
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bool success =
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#endif
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split_first(str, head, tail, '_');
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assert(success);
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2009-07-07 00:49:47 +02:00
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2010-03-23 02:43:53 +01:00
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m_filter_size = atoi(head.c_str());
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2010-04-02 20:20:32 +02:00
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m_filter_size_bits = floorLog2(m_filter_size);
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2009-07-07 00:49:47 +02:00
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2010-06-11 08:17:07 +02:00
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m_filter.resize(m_filter_size);
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2009-07-07 00:49:47 +02:00
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2010-03-23 02:43:53 +01:00
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clear();
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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BlockBloomFilter::~BlockBloomFilter()
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{
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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void
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BlockBloomFilter::clear()
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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for (int i = 0; i < m_filter_size; i++) {
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m_filter[i] = 0;
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}
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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void
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BlockBloomFilter::increment(const Address& addr)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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// Not used
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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void
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BlockBloomFilter::decrement(const Address& addr)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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// Not used
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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void
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BlockBloomFilter::merge(AbstractBloomFilter * other_filter)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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// TODO
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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void
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BlockBloomFilter::set(const Address& addr)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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int i = get_index(addr);
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m_filter[i] = 1;
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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void
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BlockBloomFilter::unset(const Address& addr)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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int i = get_index(addr);
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m_filter[i] = 0;
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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bool
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BlockBloomFilter::isSet(const Address& addr)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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int i = get_index(addr);
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return (m_filter[i]);
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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int
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BlockBloomFilter::getCount(const Address& addr)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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return m_filter[get_index(addr)];
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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int
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BlockBloomFilter::getTotalCount()
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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int count = 0;
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2009-07-07 00:49:47 +02:00
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2010-03-23 02:43:53 +01:00
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for (int i = 0; i < m_filter_size; i++) {
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if (m_filter[i]) {
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count++;
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}
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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return count;
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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int
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BlockBloomFilter::getIndex(const Address& addr)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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return get_index(addr);
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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void
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BlockBloomFilter::print(ostream& out) const
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2009-07-07 00:49:47 +02:00
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{
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}
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2010-03-23 02:43:53 +01:00
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int
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BlockBloomFilter::readBit(const int index)
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{
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return m_filter[index];
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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void
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BlockBloomFilter::writeBit(const int index, const int value)
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{
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m_filter[index] = value;
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2009-07-07 00:49:47 +02:00
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}
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2010-03-23 02:43:53 +01:00
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int
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BlockBloomFilter::get_index(const Address& addr)
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2009-07-07 00:49:47 +02:00
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{
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2010-03-23 02:43:53 +01:00
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// Pull out some bit field ==> B1
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// Pull out additional bits, not the same as B1 ==> B2
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// XOR B1 and B2 to get hash index
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physical_address_t block_bits =
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addr.bitSelect(RubySystem::getBlockSizeBits(),
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2 * RubySystem::getBlockSizeBits() - 1);
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int offset = 5;
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physical_address_t other_bits =
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addr.bitSelect(2 * RubySystem::getBlockSizeBits() + offset,
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2 * RubySystem::getBlockSizeBits() + offset +
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m_filter_size_bits - 1);
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int index = block_bits ^ other_bits;
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assert(index < m_filter_size);
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return index;
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2009-07-07 00:49:47 +02:00
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}
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