You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
/**
|
|
* Alee Forth: A portable and concise Forth implementation in modern C++.
|
|
* Copyright (C) 2023 Clyne Sullivan <clyne@bitgloo.com>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef ALEEFORTH_SPLITMEMDICT_HPP
|
|
#define ALEEFORTH_SPLITMEMDICT_HPP
|
|
|
|
#include "alee.hpp"
|
|
|
|
#include <algorithm>
|
|
|
|
#ifndef MEMDICTSIZE
|
|
#define MEMDICTSIZE (65536)
|
|
#endif
|
|
constexpr unsigned long int MemDictSize = MEMDICTSIZE;
|
|
|
|
template<unsigned long int RON>
|
|
class SplitMemDict : public Dictionary
|
|
{
|
|
const uint8_t *rodict;
|
|
uint8_t rwdict[MemDictSize - Dictionary::Begin] = {0};
|
|
uint8_t extra[Dictionary::Begin];
|
|
|
|
public:
|
|
constexpr explicit SplitMemDict(const uint8_t *rod):
|
|
rodict(rod)
|
|
{
|
|
std::copy(rodict, rodict + sizeof(extra), extra);
|
|
}
|
|
|
|
constexpr SplitMemDict(const SplitMemDict<RON>& spd):
|
|
SplitMemDict(spd.rodict) {}
|
|
constexpr auto& operator=(const SplitMemDict<RON>& spd) {
|
|
*this = SplitMemDict(spd.rodict);
|
|
return *this;
|
|
}
|
|
|
|
virtual Cell read(Addr addr) const noexcept final {
|
|
const uint8_t *dict;
|
|
if (addr < RON) {
|
|
dict = addr < Dictionary::Begin ? extra : rodict;
|
|
} else {
|
|
dict = rwdict;
|
|
addr -= RON;
|
|
}
|
|
|
|
return *reinterpret_cast<const Cell *>(dict + addr);
|
|
}
|
|
|
|
virtual void write(Addr addr, Cell value) noexcept final {
|
|
if (addr >= RON)
|
|
*reinterpret_cast<Cell *>(rwdict + addr - RON) = value;
|
|
else if (addr < Dictionary::Begin)
|
|
*reinterpret_cast<Cell *>(extra + addr) = value;
|
|
}
|
|
|
|
virtual uint8_t readbyte(Addr addr) const noexcept final {
|
|
const uint8_t *dict;
|
|
if (addr < RON) {
|
|
dict = addr < Dictionary::Begin ? extra : rodict;
|
|
} else {
|
|
dict = rwdict;
|
|
addr -= RON;
|
|
}
|
|
|
|
return dict[addr];
|
|
}
|
|
|
|
virtual void writebyte(Addr addr, uint8_t value) noexcept final {
|
|
if (addr >= RON)
|
|
rwdict[addr - RON] = value;
|
|
else if (addr < Dictionary::Begin)
|
|
extra[addr] = value;
|
|
}
|
|
};
|
|
|
|
#endif // ALEEFORTH_SPLITMEMDICT_HPP
|
|
|