block_bloom_filter.cc revision 14264
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/block_bloom_filter.hh" 3314262Sodanrc@yahoo.com.br 3414262Sodanrc@yahoo.com.br#include "base/bitfield.hh" 3514262Sodanrc@yahoo.com.br#include "base/logging.hh" 3614262Sodanrc@yahoo.com.br#include "params/BloomFilterBlock.hh" 3714262Sodanrc@yahoo.com.br 3814262Sodanrc@yahoo.com.brnamespace BloomFilter { 3914262Sodanrc@yahoo.com.br 4014262Sodanrc@yahoo.com.brBlock::Block(const BloomFilterBlockParams* p) 4114262Sodanrc@yahoo.com.br : Base(p), masksLSBs(p->masks_lsbs), 4214262Sodanrc@yahoo.com.br masksSizes(p->masks_sizes) 4314262Sodanrc@yahoo.com.br{ 4414262Sodanrc@yahoo.com.br fatal_if(masksLSBs.size() != masksSizes.size(), 4514262Sodanrc@yahoo.com.br "Masks haven't been properly provided"); 4614262Sodanrc@yahoo.com.br fatal_if(masksLSBs.size() < 1, 4714262Sodanrc@yahoo.com.br "There must be at least one mask to extract an address bitfield"); 4814262Sodanrc@yahoo.com.br 4914262Sodanrc@yahoo.com.br for (int i = 0; i < masksLSBs.size(); i++) { 5014262Sodanrc@yahoo.com.br fatal_if((masksSizes[i] > sizeBits) || (masksSizes[i] <= 0), 5114262Sodanrc@yahoo.com.br "The bitfields must be indexable in the filter"); 5214262Sodanrc@yahoo.com.br fatal_if(masksLSBs[i] + masksSizes[i] > 5314262Sodanrc@yahoo.com.br std::numeric_limits<Addr>::digits, 5414262Sodanrc@yahoo.com.br "The total size of the bitfields cannot be bigger than the " \ 5514262Sodanrc@yahoo.com.br "number of bits in an address"); 5614262Sodanrc@yahoo.com.br } 5714262Sodanrc@yahoo.com.br} 5814262Sodanrc@yahoo.com.br 5914262Sodanrc@yahoo.com.brBlock::~Block() 6014262Sodanrc@yahoo.com.br{ 6114262Sodanrc@yahoo.com.br} 6214262Sodanrc@yahoo.com.br 6314262Sodanrc@yahoo.com.brvoid 6414262Sodanrc@yahoo.com.brBlock::set(Addr addr) 6514262Sodanrc@yahoo.com.br{ 6614264Sodanrc@yahoo.com.br filter[hash(addr)]++; 6714262Sodanrc@yahoo.com.br} 6814262Sodanrc@yahoo.com.br 6914262Sodanrc@yahoo.com.brvoid 7014262Sodanrc@yahoo.com.brBlock::unset(Addr addr) 7114262Sodanrc@yahoo.com.br{ 7214264Sodanrc@yahoo.com.br filter[hash(addr)]--; 7314262Sodanrc@yahoo.com.br} 7414262Sodanrc@yahoo.com.br 7514262Sodanrc@yahoo.com.brint 7614262Sodanrc@yahoo.com.brBlock::getCount(Addr addr) const 7714262Sodanrc@yahoo.com.br{ 7814262Sodanrc@yahoo.com.br return filter[hash(addr)]; 7914262Sodanrc@yahoo.com.br} 8014262Sodanrc@yahoo.com.br 8114262Sodanrc@yahoo.com.brint 8214262Sodanrc@yahoo.com.brBlock::hash(Addr addr) const 8314262Sodanrc@yahoo.com.br{ 8414262Sodanrc@yahoo.com.br Addr hashed_addr = 0; 8514262Sodanrc@yahoo.com.br for (int i = 0; i < masksLSBs.size(); i++) { 8614262Sodanrc@yahoo.com.br hashed_addr ^= 8714262Sodanrc@yahoo.com.br bits(addr, offsetBits + masksLSBs[i] + masksSizes[i] - 1, 8814262Sodanrc@yahoo.com.br offsetBits + masksLSBs[i]); 8914262Sodanrc@yahoo.com.br } 9014262Sodanrc@yahoo.com.br assert(hashed_addr < filter.size()); 9114262Sodanrc@yahoo.com.br return hashed_addr; 9214262Sodanrc@yahoo.com.br} 9314262Sodanrc@yahoo.com.br 9414262Sodanrc@yahoo.com.br} // namespace BloomFilter 9514262Sodanrc@yahoo.com.br 9614262Sodanrc@yahoo.com.brBloomFilter::Block* 9714262Sodanrc@yahoo.com.brBloomFilterBlockParams::create() 9814262Sodanrc@yahoo.com.br{ 9914262Sodanrc@yahoo.com.br return new BloomFilter::Block(this); 10014262Sodanrc@yahoo.com.br} 10114262Sodanrc@yahoo.com.br 102