block_bloom_filter.hh revision 14262:991410960fdb
1/* 2 * Copyright (c) 2019 Inria 3 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Daniel Carvalho 30 */ 31 32#ifndef __BASE_FILTERS_BLOCK_BLOOM_FILTER_HH__ 33#define __BASE_FILTERS_BLOCK_BLOOM_FILTER_HH__ 34 35#include <vector> 36 37#include "base/filters/base.hh" 38 39struct BloomFilterBlockParams; 40 41namespace BloomFilter { 42 43/** 44 * Simple deletable (with false negatives) bloom filter that extracts 45 * bitfields of an address to use as indexes of the filter vector. 46 */ 47class Block : public Base 48{ 49 public: 50 Block(const BloomFilterBlockParams* p); 51 ~Block(); 52 53 void set(Addr addr) override; 54 void unset(Addr addr) override; 55 int getCount(Addr addr) const override; 56 57 private: 58 /** 59 * XOR hash between bitfields of an address, provided by the mask vector. 60 * 61 * @param addr The address to be hashed. 62 * @return The value of the XOR of the masked bitfields of the address. 63 */ 64 int hash(Addr addr) const; 65 66 /** Position of the LSB of each mask. */ 67 std::vector<unsigned> masksLSBs; 68 69 /** Number of bits in each mask. */ 70 std::vector<unsigned> masksSizes; 71}; 72 73} // namespace BloomFilter 74 75#endif // __BASE_FILTERS_BLOCK_BLOOM_FILTER_HH__ 76