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