// 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(folly::StringPiece sl, bool trueStatic) {
if (UNLIKELY(sl.size() > StringData::MaxSize)) {
throw_string_too_large(sl.size());
}
auto const cc = CapCode::ceil(sl.size());
auto const need = cc.decode() + kCapOverhead;
auto const sd = static_cast<StringData*>(
trueStatic ? low_malloc_data(need) : malloc(need)
);
auto const data = reinterpret_cast<char*>(sd + 1);
#ifndef NO_M_DATA
sd->m_data = data;
#endif
auto const count = trueStatic ? StaticValue : UncountedValue;
sd->m_hdr.init(cc, HeaderKind::String, count);
sd->m_len = sl.size(); // m_hash is computed soon.
data[sl.size()] = 0;
auto const mcret = memcpy(data, sl.data(), sl.size());
auto const ret = reinterpret_cast<StringData*>(mcret) - 1;
// Recalculating ret from mcret avoids a spill.
ret->preCompute(); // get m_hash right
assert(ret == sd);
assert(ret->isFlat());
assert(trueStatic ? ret->isStatic() : ret->isUncounted());
assert(ret->checkSane());
return ret;
}
void processInit() {
auto codeLock = lockCode();
auto metaLock = lockMetadata();
g_code = new(low_malloc_data(sizeof(CodeCache))) CodeCache();
g_ustubs.emitAll(*g_code, *Debug::DebugInfo::Get());
// Write an .eh_frame section that covers the whole TC.
initUnwinder(g_code->base(), g_code->codeSize());
Disasm::ExcludedAddressRange(g_code->base(), g_code->codeSize());
}