bulk_bloom_filter.cc revision 14263
114262Sodanrc@yahoo.com.br/* 214262Sodanrc@yahoo.com.br * Copyright (c) 2019 Inria 314262Sodanrc@yahoo.com.br * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood 414262Sodanrc@yahoo.com.br * All rights reserved. 514262Sodanrc@yahoo.com.br * 614262Sodanrc@yahoo.com.br * Redistribution and use in source and binary forms, with or without 714262Sodanrc@yahoo.com.br * modification, are permitted provided that the following conditions are 814262Sodanrc@yahoo.com.br * met: redistributions of source code must retain the above copyright 914262Sodanrc@yahoo.com.br * notice, this list of conditions and the following disclaimer; 1014262Sodanrc@yahoo.com.br * redistributions in binary form must reproduce the above copyright 1114262Sodanrc@yahoo.com.br * notice, this list of conditions and the following disclaimer in the 1214262Sodanrc@yahoo.com.br * documentation and/or other materials provided with the distribution; 1314262Sodanrc@yahoo.com.br * neither the name of the copyright holders nor the names of its 1414262Sodanrc@yahoo.com.br * contributors may be used to endorse or promote products derived from 1514262Sodanrc@yahoo.com.br * this software without specific prior written permission. 1614262Sodanrc@yahoo.com.br * 1714262Sodanrc@yahoo.com.br * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1814262Sodanrc@yahoo.com.br * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1914262Sodanrc@yahoo.com.br * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 2014262Sodanrc@yahoo.com.br * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2114262Sodanrc@yahoo.com.br * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2214262Sodanrc@yahoo.com.br * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2314262Sodanrc@yahoo.com.br * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2414262Sodanrc@yahoo.com.br * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2514262Sodanrc@yahoo.com.br * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2614262Sodanrc@yahoo.com.br * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2714262Sodanrc@yahoo.com.br * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2814262Sodanrc@yahoo.com.br * 2914262Sodanrc@yahoo.com.br * Authors: Daniel Carvalho 3014262Sodanrc@yahoo.com.br */ 3114262Sodanrc@yahoo.com.br 3214262Sodanrc@yahoo.com.br#include "base/filters/bulk_bloom_filter.hh" 3314262Sodanrc@yahoo.com.br 3414262Sodanrc@yahoo.com.br#include <limits> 3514262Sodanrc@yahoo.com.br 3614262Sodanrc@yahoo.com.br#include "base/bitfield.hh" 3714263Sodanrc@yahoo.com.br#include "base/logging.hh" 3814262Sodanrc@yahoo.com.br#include "params/BloomFilterBulk.hh" 3914262Sodanrc@yahoo.com.br 4014262Sodanrc@yahoo.com.brnamespace BloomFilter { 4114262Sodanrc@yahoo.com.br 4214262Sodanrc@yahoo.com.brBulk::Bulk(const BloomFilterBulkParams* p) 4314263Sodanrc@yahoo.com.br : MultiBitSel(p), sectorBits(floorLog2(parFilterSize)) 4414262Sodanrc@yahoo.com.br{ 4514263Sodanrc@yahoo.com.br fatal_if((numHashes * sectorBits) > 4614263Sodanrc@yahoo.com.br (std::numeric_limits<Addr>::digits - offsetBits), 4714263Sodanrc@yahoo.com.br "Sectors need more bits than available"); 4814262Sodanrc@yahoo.com.br} 4914262Sodanrc@yahoo.com.br 5014262Sodanrc@yahoo.com.brBulk::~Bulk() 5114262Sodanrc@yahoo.com.br{ 5214262Sodanrc@yahoo.com.br} 5314262Sodanrc@yahoo.com.br 5414263Sodanrc@yahoo.com.brint 5514263Sodanrc@yahoo.com.brBulk::hash(Addr addr, int hash_number) const 5614262Sodanrc@yahoo.com.br{ 5714263Sodanrc@yahoo.com.br addr = permute(addr); 5814262Sodanrc@yahoo.com.br 5914263Sodanrc@yahoo.com.br // Get the sector-based c index 6014263Sodanrc@yahoo.com.br int c = bits(addr, (offsetBits + (hash_number + 1) * sectorBits) - 1, 6114263Sodanrc@yahoo.com.br offsetBits + hash_number * sectorBits); 6214263Sodanrc@yahoo.com.br assert(c < filter.size()/numHashes); 6314262Sodanrc@yahoo.com.br 6414263Sodanrc@yahoo.com.br // Transform the sector-based c index into a filder index (v) 6514263Sodanrc@yahoo.com.br c += (numHashes - 1 - hash_number) * (filter.size()/numHashes); 6614263Sodanrc@yahoo.com.br assert(c < filter.size()); 6714262Sodanrc@yahoo.com.br 6814263Sodanrc@yahoo.com.br return c; 6914262Sodanrc@yahoo.com.br} 7014262Sodanrc@yahoo.com.br 7114262Sodanrc@yahoo.com.brAddr 7214263Sodanrc@yahoo.com.brBulk::permute(Addr addr) const 7314262Sodanrc@yahoo.com.br{ 7414262Sodanrc@yahoo.com.br // permutes the original address bits according to Table 5 7514262Sodanrc@yahoo.com.br Addr part1 = bits(addr, offsetBits + 6, offsetBits), 7614262Sodanrc@yahoo.com.br part2 = bits(addr, offsetBits + 9), 7714262Sodanrc@yahoo.com.br part3 = bits(addr, offsetBits + 11), 7814262Sodanrc@yahoo.com.br part4 = bits(addr, offsetBits + 17), 7914262Sodanrc@yahoo.com.br part5 = bits(addr, offsetBits + 8, offsetBits + 7), 8014262Sodanrc@yahoo.com.br part6 = bits(addr, offsetBits + 10), 8114262Sodanrc@yahoo.com.br part7 = bits(addr, offsetBits + 12), 8214262Sodanrc@yahoo.com.br part8 = bits(addr, offsetBits + 13), 8314262Sodanrc@yahoo.com.br part9 = bits(addr, offsetBits + 16, offsetBits + 15), 8414262Sodanrc@yahoo.com.br part10 = bits(addr, offsetBits + 20, offsetBits + 18), 8514262Sodanrc@yahoo.com.br part11 = bits(addr, offsetBits + 14); 8614262Sodanrc@yahoo.com.br 8714262Sodanrc@yahoo.com.br Addr result = 8814262Sodanrc@yahoo.com.br (part1 << 14) | (part2 << 13) | (part3 << 12) | (part4 << 11) | 8914262Sodanrc@yahoo.com.br (part5 << 9) | (part6 << 8) | (part7 << 7) | (part8 << 6) | 9014262Sodanrc@yahoo.com.br (part9 << 4) | (part10 << 1) | (part11); 9114262Sodanrc@yahoo.com.br 9214262Sodanrc@yahoo.com.br // Select the remaining high-order bits 9314262Sodanrc@yahoo.com.br Addr remaining_bits = bits(addr, std::numeric_limits<Addr>::digits - 1, 9414262Sodanrc@yahoo.com.br offsetBits + 21) << 21; 9514262Sodanrc@yahoo.com.br result = result | remaining_bits; 9614262Sodanrc@yahoo.com.br 9714262Sodanrc@yahoo.com.br return result; 9814262Sodanrc@yahoo.com.br} 9914262Sodanrc@yahoo.com.br 10014262Sodanrc@yahoo.com.br} // namespace BloomFilter 10114262Sodanrc@yahoo.com.br 10214262Sodanrc@yahoo.com.brBloomFilter::Bulk* 10314262Sodanrc@yahoo.com.brBloomFilterBulkParams::create() 10414262Sodanrc@yahoo.com.br{ 10514262Sodanrc@yahoo.com.br return new BloomFilter::Bulk(this); 10614262Sodanrc@yahoo.com.br} 10714262Sodanrc@yahoo.com.br 108