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alee-forth/libalee/state.cpp

92 lines
2.1 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/>.
*/
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#include "corewords.hpp"
#include "state.hpp"
#include <cstring>
#include <iterator>
bool State::compiling() const
{
return dict.read(Dictionary::Compiling);
}
void State::compiling(bool yes)
{
dict.write(Dictionary::Compiling, yes);
}
std::pair<Addr, std::jmp_buf> State::save()
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{
std::pair<Addr, std::jmp_buf> st;
st.first = ip;
std::memcpy(st.second, jmpbuf, sizeof(std::jmp_buf));
return st;
}
void State::load(const std::pair<Addr, std::jmp_buf>& st)
{
ip = st.first;
std::memcpy(jmpbuf, st.second, sizeof(std::jmp_buf));
}
Error State::execute(Addr addr)
{
auto stat = static_cast<Error>(setjmp(jmpbuf));
if (stat == Error::none) {
CoreWords::run(addr, *this);
if (ip >= Dictionary::Begin) {
// longjmp will exit this loop.
for (;;)
CoreWords::run(dict.read(ip), *this);
} else {
// addr was a CoreWord, all done now.
ip = 0;
}
} else if (stat == Error::exit) {
stat = Error::none;
}
return stat;
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}
void State::reset()
{
while (size())
pop();
while (rsize())
popr();
dict.write(Dictionary::Compiling, 0);
ip = 0;
}
std::size_t State::size() const noexcept
{
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return dsp - dstack;
}
std::size_t State::rsize() const noexcept
{
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return rsp - rstack;
}