// create either a static or an uncounted string.
// Diffrence between static and uncounted is in the lifetime
// of the string. Static are alive for the lifetime of the process.
// Uncounted are not ref counted but will be deleted at some point.
ALWAYS_INLINE
StringData* StringData::MakeShared(StringSlice sl, bool trueStatic) {
if (UNLIKELY(sl.len > StringData::MaxSize)) {
throw_string_too_large(sl.len);
}
auto const cc = CapCode::ceil(sl.len);
auto const need = cc.decode() + kCapOverhead;
auto const sd = static_cast<StringData*>(
trueStatic ? low_malloc(need) : malloc(need)
);
auto const data = reinterpret_cast<char*>(sd + 1);
sd->m_data = data;
sd->m_hdr.init(cc, HeaderKind::String, 0);
sd->m_lenAndHash = sl.len; // hash=0
data[sl.len] = 0;
auto const mcret = memcpy(data, sl.ptr, sl.len);
auto const ret = reinterpret_cast<StringData*>(mcret) - 1;
// Recalculating ret from mcret avoids a spill.
assert(ret->m_hash == 0);
assert(ret->getCount() == 0);
if (trueStatic) {
ret->setStatic();
} else {
ret->setUncounted();
}
assert(ret == sd);
assert(ret->isFlat());
assert(trueStatic ? ret->isStatic() : ret->isUncounted());
assert(ret->checkSane());
return ret;
}
// create either a static or an uncounted string.
// Diffrence between static and uncounted is in the lifetime
// of the string. Static are alive for the lifetime of the process.
// Uncounted are not ref counted but will be deleted at some point.
StringData* StringData::MakeShared(StringSlice sl, bool trueStatic) {
if (UNLIKELY(sl.len > StringData::MaxSize)) {
throw_string_too_large(sl.len);
}
auto const encodable = roundUpPackedCap(sl.len);
auto const need = encodable + kCapOverhead;
auto const sd = static_cast<StringData*>(
trueStatic ? low_malloc(need) : malloc(need)
);
auto const data = reinterpret_cast<char*>(sd + 1);
auto const capCode = packedCapToCode(encodable);
sd->m_data = data;
sd->m_capAndCount = HeaderKind::String << 24 | capCode; // count=0
sd->m_lenAndHash = sl.len; // hash=0
data[sl.len] = 0;
auto const mcret = memcpy(data, sl.ptr, sl.len);
auto const ret = reinterpret_cast<StringData*>(mcret) - 1;
// Recalculating ret from mcret avoids a spill.
assert(ret->m_hash == 0);
assert(ret->m_count == 0);
if (trueStatic) {
ret->setStatic();
} else {
ret->setUncounted();
}
assert(ret == sd);
assert(ret->isFlat());
assert(trueStatic ? ret->isStatic() : ret->isUncounted());
assert(ret->checkSane());
return ret;
}
