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67 lines
1.6 KiB
C++
67 lines
1.6 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_STATE_HPP
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#define ALEEFORTH_STATE_HPP
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#include "dictionary.hpp"
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#include "types.hpp"
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#include <cstddef>
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constexpr unsigned DataStackSize = 12;
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constexpr unsigned ReturnStackSize = 12;
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class State
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{
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Cell dstack[DataStackSize] = {};
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Cell rstack[ReturnStackSize] = {};
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Cell *dsp = dstack - 1;
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Cell *rsp = rstack - 1;
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public:
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Addr ip = 0;
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Dictionary& dict;
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void (*input)(State&);
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constexpr State(Dictionary& d, void (*i)(State&)):
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dict(d), input(i) {}
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bool compiling() const;
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void compiling(bool);
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void execute(Addr);
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Cell beyondip() const;
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void pushr(Cell);
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Cell popr();
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void push(Cell);
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Cell pop();
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Cell& top();
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Cell& pick(std::size_t);
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std::size_t size() const noexcept;
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std::size_t rsize() const noexcept;
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};
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#endif // ALEEFORTH_STATE_HPP
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