lib/Sema/SemaChecking.cpp

694                                FormatStringInfo *FSI) {
695   FSI->HasVAListArg = Format->getFirstArg() == 0;
696   FSI->FormatIdx = Format->getFormatIdx() - 1;
697   FSI->FirstDataArg = FSI->HasVAListArg ? 0 : Format->getFirstArg() - 1;
703     if(FSI->FormatIdx == 0)
705     --FSI->FormatIdx;
706     if (FSI->FirstDataArg != 0)
707       --FSI->FirstDataArg;
2226   FormatStringInfo FSI;
2227   if (getFormatStringInfo(Format, IsCXXMember, &FSI))
2228     return CheckFormatArguments(Args, FSI.HasVAListArg, FSI.FormatIdx,
2229                                 FSI.FirstDataArg, GetFormatStringType(Format),