perfect_bloom_filter.cc

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/*
 * Copyright (c) 2019 Inria
 * All rights reserved.
 *
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 * 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
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#include "base/filters/perfect_bloom_filter.hh"
 
#include "base/logging.hh"
#include "params/BloomFilterPerfect.hh"
 
namespace gem5
{
 
GEM5_DEPRECATED_NAMESPACE(BloomFilter, bloom_filter);
namespace bloom_filter
{
 
Perfect::Perfect(const BloomFilterPerfectParams &p)
    : Base(p)
{
    fatal_if(p.size != 1, "The perfect Bloom filter cannot be limited to a "
        "specific size.");
    fatal_if(p.num_bits != 1, "The perfect Bloom filter tracks entries "
        "perfectly using an unlimited amount of 1-bit entries.");
    fatal_if(p.threshold != 1, "The perfect Bloom filter uses 1-bit entries; "
        "thus, their thresholds must be 1.");
}
 
Perfect::~Perfect()
{
}
 
void
Perfect::clear()
{
    entries.clear();
}
 
void
Perfect::merge(const Base* other)
{
    auto* cast_other = static_cast<const Perfect*>(other);
    entries.insert(cast_other->entries.begin(), cast_other->entries.end());
}
 
void
Perfect::set(Addr addr)
{
    entries.insert(addr);
}
 
void
Perfect::unset(Addr addr)
{
    entries.erase(addr);
}
 
int
Perfect::getCount(Addr addr) const
{
    return entries.find(addr) != entries.end();
}
 
int
Perfect::getTotalCount() const
{
    return entries.size();
}
 
} // namespace bloom_filter
} // namespace gem5