void ParserBase::popLabelInfo() {
assert(!m_labelInfos.empty());
LabelInfo &info = m_labelInfos.back();
LabelMap labels = info.labels; // shallow copy
for (unsigned int i = 0; i < info.gotos.size(); i++) {
const GotoInfo &gotoInfo = info.gotos[i];
LabelMap::const_iterator iter = info.labels.find(gotoInfo.label);
if (iter == info.labels.end()) {
invalidateGoto(gotoInfo.stmt, UndefLabel);
error("'goto' to undefined label '%s': %s",
gotoInfo.label.c_str(), getMessage(gotoInfo.loc.get()).c_str());
continue;
}
const LabelStmtInfo &labelInfo = iter->second;
if (gotoInfo.label.find(YIELD_LABEL_PREFIX) == 0) {
labels.erase(gotoInfo.label);
continue;
}
int labelScopeId = labelInfo.scopeId;
bool found = false;
for (int j = gotoInfo.scopes.size() - 1; j >= 0; j--) {
if (labelScopeId == gotoInfo.scopes[j]) {
found = true;
break;
}
}
if (!found) {
invalidateGoto(gotoInfo.stmt, InvalidBlock);
error("'goto' into loop or switch statement "
"is disallowed: %s", getMessage(gotoInfo.loc.get()).c_str());
continue;
} else {
labels.erase(gotoInfo.label);
}
}
// now invalidate all un-used labels
for (LabelMap::const_iterator it(labels.begin());
it != labels.end();
++it) {
invalidateLabel(it->second.stmt);
}
m_labelInfos.pop_back();
}
void ParserBase::addLabel(const std::string &label,
LocationPtr loc,
ScannerToken *stmt) {
assert(!m_labelInfos.empty());
LabelInfo &info = m_labelInfos.back();
if (info.labels.find(label) != info.labels.end()) {
error("Label '%s' already defined: %s", label.c_str(),
getMessage().c_str());
invalidateLabel(extractStatement(stmt));
return;
}
assert(!info.scopes.empty());
LabelStmtInfo labelInfo;
labelInfo.scopeId = info.scopes.back();
labelInfo.stmt = extractStatement(stmt);
labelInfo.loc = loc;
info.labels[label] = labelInfo;
}