StringData *StringData::GetStaticString(const StringData *str) {
if (UNLIKELY(!s_stringDataMap)) {
StringDataMap::Config config;
config.growthFactor = 1;
s_stringDataMap =
new StringDataMap(RuntimeOption::EvalInitialStaticStringTableSize,
config);
}
if (str->isStatic()) {
assert(checkStaticStr(str));
return const_cast<StringData*>(str);
}
StringDataMap::const_iterator it = s_stringDataMap->find(str);
if (it != s_stringDataMap->end()) {
return const_cast<StringData*>(it->first);
}
// Lookup failed, so do the hard work of creating a StringData with its own
// copy of the key string, so that the atomic insert() has a permanent key.
StringData *sd = (StringData*)Util::low_malloc(sizeof(StringData));
new (sd) StringData(str->data(), str->size(), CopyMalloc);
sd->setStatic();
auto pair = s_stringDataMap->insert(sd, 0);
if (!pair.second) {
sd->~StringData();
Util::low_free(sd);
}
assert(pair.first->first != nullptr);
return const_cast<StringData*>(pair.first->first);
}
