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86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
2 years ago
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/**
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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_SPLITMEMDICT_HPP
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#define ALEEFORTH_SPLITMEMDICT_HPP
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#include "dictionary.hpp"
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#include <cstring>
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#ifndef MEMDICTSIZE
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#define MEMDICTSIZE (65536)
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#endif
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constexpr unsigned long int MemDictSize = MEMDICTSIZE;
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template<unsigned long int RON>
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class SplitMemDict : public Dictionary
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{
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const uint8_t *rodict;
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uint8_t rwdict[MemDictSize];
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uint8_t extra[Dictionary::Begin];
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public:
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constexpr SplitMemDict(const uint8_t *rod):
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rodict(rod)
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{
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std::memcpy(extra, rodict, sizeof(extra));
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}
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virtual Cell read(Addr addr) const noexcept final {
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const uint8_t *dict;
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if (addr < RON) {
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dict = addr < Dictionary::Begin ? extra : rodict;
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} else {
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dict = rwdict;
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addr -= RON;
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}
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return *reinterpret_cast<const Cell *>(dict + addr);
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}
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virtual void write(Addr addr, Cell value) noexcept final {
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if (addr >= RON)
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*reinterpret_cast<Cell *>(rwdict + addr - RON) = value;
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else if (addr < Dictionary::Begin)
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*reinterpret_cast<Cell *>(extra + addr) = value;
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}
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virtual uint8_t readbyte(Addr addr) const noexcept final {
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const uint8_t *dict;
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if (addr < RON) {
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dict = addr < Dictionary::Begin ? extra : rodict;
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} else {
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dict = rwdict;
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addr -= RON;
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}
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return dict[addr];
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}
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virtual void writebyte(Addr addr, uint8_t value) noexcept final {
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if (addr >= RON)
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rwdict[addr - RON] = value;
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else if (addr < Dictionary::Begin)
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extra[addr] = value;
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}
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};
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#endif // ALEEFORTH_SPLITMEMDICT_HPP
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