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improved first pass by using prog vector size instead of pc; added pc offset vector clear to reset

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This commit is contained in:
Bob Polis 2020-09-22 10:51:20 +02:00
parent 27ad2a900c
commit 184cab5205
1 changed files with 5 additions and 6 deletions
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11
interpreter.cpp
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@ -24,6 +24,7 @@ void interpreter::reset() {
_labels.clear();
_vars.clear();
_calls.clear();
_pc_offsets.clear();
_pc = 0;
}
@ -33,14 +34,12 @@ std::string interpreter::eval(std::istream& in, bool& done) {
done = false;
// first pass: read program & resolve labels
for (std::string line; std::getline(in, line); ++_pc) {
for (std::string line; std::getline(in, line);) {
if (line[0] == ':') { // check label definition
_labels.emplace(line.substr(1), _pc);
_pc_offsets.push_back(_pc);
_pc--; // we'll lose this line
_labels.emplace(line.substr(1), _prog.size());
_pc_offsets.push_back(_prog.size());
} else if (line[0] == '#') { // check comment
_pc_offsets.push_back(_pc);
_pc--; // we'll lose this line
_pc_offsets.push_back(_prog.size());
} else {
_prog.push_back(line);
}