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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
//
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/// @file memdict.hpp
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/// @brief Simple dictionary implementation using a large memory block.
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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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#ifndef ALEEFORTH_MEMDICT_HPP
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#define ALEEFORTH_MEMDICT_HPP
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#include "alee.hpp"
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#ifndef MEMDICTSIZE
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/** Default dictionary size in bytes. */
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#define MEMDICTSIZE (65536)
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#endif
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/** Size in bytes of a MemDict. */
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constexpr unsigned long int MemDictSize = MEMDICTSIZE;
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/**
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* @class MemDict
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* Dictionary implementation that uses a large block of memory.
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*/
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class MemDict : public Dictionary
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{
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/** Block of memory to contain dictionary's contents. */
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uint8_t dict[MemDictSize] = {0};
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public:
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/** Returns the value of the cell at the given address. */
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virtual Cell read(Addr addr) const noexcept final {
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return *reinterpret_cast<const Cell *>(dict + addr);
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}
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/** Writes the given value to the cell at the given address. */
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virtual void write(Addr addr, Cell value) noexcept final {
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*reinterpret_cast<Cell *>(dict + addr) = value;
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}
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/** Returns the value of the byte at the given address. */
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virtual uint8_t readbyte(Addr addr) const noexcept final {
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return dict[addr];
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}
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/** Writes the given value to the byte at the given address. */
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virtual void writebyte(Addr addr, uint8_t value) noexcept final {
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dict[addr] = value;
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}
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/** Returns the size of the dictionary's memory block. */
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virtual unsigned long int capacity() const noexcept final {
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return sizeof(dict);
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}
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};
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#endif // ALEEFORTH_MEMDICT_HPP
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