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79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/**
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* Alee Forth: A portable and concise Forth implementation in modern C++.
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* Copyright (C) 2023 Clyne Sullivan <clyne@bitgloo.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef ALEEFORTH_SPLITMEMDICTRW_HPP
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#define ALEEFORTH_SPLITMEMDICTRW_HPP
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#include "alee.hpp"
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#include <algorithm>
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template<unsigned long int LON, unsigned long int HIN>
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class SplitMemDictRW : public Dictionary
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{
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uint8_t *lodict;
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uint32_t hidict;
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public:
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constexpr explicit SplitMemDictRW(uint8_t *lo, uint32_t hi):
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lodict(lo), hidict(hi) {}
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constexpr SplitMemDictRW(const SplitMemDictRW<LON, HIN>& spd):
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SplitMemDictRW(spd.lodict, spd.hidict) {}
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constexpr auto& operator=(const SplitMemDictRW<LON, HIN>& spd) {
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*this = SplitMemDictRW(spd.lodict, hidict);
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return *this;
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}
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virtual Cell read(Addr addr) const noexcept final {
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if (addr < LON)
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return *reinterpret_cast<const Cell *>(lodict + addr);
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else
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return _data20_read_short(hidict + addr - LON);
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}
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virtual void write(Addr addr, Cell value) noexcept final {
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if (addr < LON)
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*reinterpret_cast<Cell *>(lodict + addr) = value;
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else
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_data20_write_short(hidict + addr - LON, value);
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}
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virtual uint8_t readbyte(Addr addr) const noexcept final {
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if (addr < LON)
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return lodict[addr];
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else
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return _data20_read_char(hidict + addr - LON);
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}
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virtual void writebyte(Addr addr, uint8_t value) noexcept final {
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if (addr < LON)
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lodict[addr] = value;
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else
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_data20_write_char(hidict + addr - LON, value);
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}
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virtual unsigned long int capacity() const noexcept final {
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return LON + HIN;
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}
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};
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#endif // ALEEFORTH_SPLITMEMDICTRW_HPP
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