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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2021 Symbiflow Authors
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#ifndef DYNAMIC_BITARRAY_H
#define DYNAMIC_BITARRAY_H
#include <cstdint>
#include <limits>
#include <vector>
#include "nextpnr_namespaces.h"
NEXTPNR_NAMESPACE_BEGIN
// This class implements a simple dynamic bitarray, backed by some resizable
// random access storage. The default is to use a std::vector<uint8_t>.
template <typename Storage = std::vector<uint8_t>> class DynamicBitarray
{
public:
static_assert(!std::numeric_limits<typename Storage::value_type>::is_signed, "Storage must be unsigned!");
void fill(bool value)
{
std::fill(storage.begin(), storage.end(), value ? std::numeric_limits<typename Storage::value_type>::max() : 0);
}
constexpr size_t bits_per_value() const { return std::numeric_limits<typename Storage::value_type>::digits; }
bool get(size_t bit) const
{
size_t element_index = bit / bits_per_value();
size_t bit_offset = bit % bits_per_value();
auto element = storage.at(element_index);
return (element & (1 << bit_offset)) != 0;
}
void set(size_t bit, bool value)
{
size_t element_index = bit / bits_per_value();
size_t bit_offset = bit % bits_per_value();
if (value) {
storage.at(element_index) |= (1 << bit_offset);
} else {
storage.at(element_index) &= ~(1 << bit_offset);
}
}
void resize(size_t number_bits)
{
size_t required_storage = (number_bits + bits_per_value() - 1) / bits_per_value();
storage.resize(required_storage);
}
size_t size() const { return storage.size() * bits_per_value(); }
void clear() { return storage.clear(); }
private:
Storage storage;
};
NEXTPNR_NAMESPACE_END
#endif /* DYNAMIC_BITARRAY_H */
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