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87 lines
2.0 KiB
C++
87 lines
2.0 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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#include "corewords.hpp"
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#include "state.hpp"
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#include <iterator>
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bool State::compiling() const
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{
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return dict.read(Dictionary::Compiling);
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}
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void State::compiling(bool yes)
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{
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dict.write(Dictionary::Compiling, yes);
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}
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State::Context State::save()
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{
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return context;
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}
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void State::load(const State::Context& ctx)
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{
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context = ctx;
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}
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Error State::execute(Addr addr)
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{
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auto stat = static_cast<Error>(setjmp(context.jmpbuf));
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if (stat == Error::none) {
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CoreWords::run(addr, *this);
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if (context.ip >= Dictionary::Begin) {
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// longjmp will exit this loop.
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for (;;)
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CoreWords::run(dict.read(context.ip), *this);
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} else {
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// addr was a CoreWord, all done now.
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context.ip = 0;
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}
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} else if (stat == Error::exit) {
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stat = Error::none;
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}
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return stat;
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}
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void State::reset()
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{
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while (size())
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pop();
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while (rsize())
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popr();
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dict.write(Dictionary::Compiling, 0);
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context.ip = 0;
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}
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std::size_t State::size() const noexcept
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{
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return dsp - dstack;
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}
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std::size_t State::rsize() const noexcept
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{
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return rsp - rstack;
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}
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