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/*
* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "mem/ruby/filters/BlockBloomFilter.hh"
#include "base/bitfield.hh"
#include "base/logging.hh"
#include "params/BloomFilterBlock.hh"
namespace BloomFilter {
Block::Block(const BloomFilterBlockParams* p)
: Base(p), masksLSBs(p->masks_lsbs),
masksSizes(p->masks_sizes)
{
fatal_if(masksLSBs.size() != masksSizes.size(),
"Masks haven't been properly provided");
fatal_if(masksLSBs.size() < 1,
"There must be at least one mask to extract an address bitfield");
for (int i = 0; i < masksLSBs.size(); i++) {
fatal_if((masksSizes[i] > sizeBits) || (masksSizes[i] <= 0),
"The bitfields must be indexable in the filter");
fatal_if(masksLSBs[i] + masksSizes[i] >
std::numeric_limits<Addr>::digits,
"The total size of the bitfields cannot be bigger than the " \
"number of bits in an address");
}
}
Block::~Block()
{
}
void
Block::set(Addr addr)
{
filter[hash(addr)] = 1;
}
void
Block::unset(Addr addr)
{
filter[hash(addr)] = 0;
}
int
Block::getCount(Addr addr) const
{
return filter[hash(addr)];
}
int
Block::hash(Addr addr) const
{
Addr hashed_addr = 0;
for (int i = 0; i < masksLSBs.size(); i++) {
hashed_addr ^=
bits(addr, offsetBits + masksLSBs[i] + masksSizes[i] - 1,
offsetBits + masksLSBs[i]);
}
assert(hashed_addr < filter.size());
return hashed_addr;
}
} // namespace BloomFilter
BloomFilter::Block*
BloomFilterBlockParams::create()
{
return new BloomFilter::Block(this);
}
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