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