blob: 4977aaa51319572473c75555e5977a4c471adc5d [file] [log] [blame]
// FormatString.cpp - Common stuff for handling printf/scanf formats -*- C++ -*-
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Shared details for processing format strings of printf and scanf
// (and friends).
//
//===----------------------------------------------------------------------===//
#include "FormatStringParsing.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/Support/ConvertUTF.h"
using clang::analyze_format_string::ArgType;
using clang::analyze_format_string::FormatStringHandler;
using clang::analyze_format_string::FormatSpecifier;
using clang::analyze_format_string::LengthModifier;
using clang::analyze_format_string::OptionalAmount;
using clang::analyze_format_string::ConversionSpecifier;
using namespace clang;
// Key function to FormatStringHandler.
FormatStringHandler::~FormatStringHandler() {}
//===----------------------------------------------------------------------===//
// Functions for parsing format strings components in both printf and
// scanf format strings.
//===----------------------------------------------------------------------===//
OptionalAmount
clang::analyze_format_string::ParseAmount(const char *&Beg, const char *E) {
const char *I = Beg;
UpdateOnReturn <const char*> UpdateBeg(Beg, I);
unsigned accumulator = 0;
bool hasDigits = false;
for ( ; I != E; ++I) {
char c = *I;
if (c >= '0' && c <= '9') {
hasDigits = true;
accumulator = (accumulator * 10) + (c - '0');
continue;
}
if (hasDigits)
return OptionalAmount(OptionalAmount::Constant, accumulator, Beg, I - Beg,
false);
break;
}
return OptionalAmount();
}
OptionalAmount
clang::analyze_format_string::ParseNonPositionAmount(const char *&Beg,
const char *E,
unsigned &argIndex) {
if (*Beg == '*') {
++Beg;
return OptionalAmount(OptionalAmount::Arg, argIndex++, Beg, 0, false);
}
return ParseAmount(Beg, E);
}
OptionalAmount
clang::analyze_format_string::ParsePositionAmount(FormatStringHandler &H,
const char *Start,
const char *&Beg,
const char *E,
PositionContext p) {
if (*Beg == '*') {
const char *I = Beg + 1;
const OptionalAmount &Amt = ParseAmount(I, E);
if (Amt.getHowSpecified() == OptionalAmount::NotSpecified) {
H.HandleInvalidPosition(Beg, I - Beg, p);
return OptionalAmount(false);
}
if (I == E) {
// No more characters left?
H.HandleIncompleteSpecifier(Start, E - Start);
return OptionalAmount(false);
}
assert(Amt.getHowSpecified() == OptionalAmount::Constant);
if (*I == '$') {
// Handle positional arguments
// Special case: '*0$', since this is an easy mistake.
if (Amt.getConstantAmount() == 0) {
H.HandleZeroPosition(Beg, I - Beg + 1);
return OptionalAmount(false);
}
const char *Tmp = Beg;
Beg = ++I;
return OptionalAmount(OptionalAmount::Arg, Amt.getConstantAmount() - 1,
Tmp, 0, true);
}
H.HandleInvalidPosition(Beg, I - Beg, p);
return OptionalAmount(false);
}
return ParseAmount(Beg, E);
}
bool
clang::analyze_format_string::ParseFieldWidth(FormatStringHandler &H,
FormatSpecifier &CS,
const char *Start,
const char *&Beg, const char *E,
unsigned *argIndex) {
// FIXME: Support negative field widths.
if (argIndex) {
CS.setFieldWidth(ParseNonPositionAmount(Beg, E, *argIndex));
}
else {
const OptionalAmount Amt =
ParsePositionAmount(H, Start, Beg, E,
analyze_format_string::FieldWidthPos);
if (Amt.isInvalid())
return true;
CS.setFieldWidth(Amt);
}
return false;
}
bool
clang::analyze_format_string::ParseArgPosition(FormatStringHandler &H,
FormatSpecifier &FS,
const char *Start,
const char *&Beg,
const char *E) {
const char *I = Beg;
const OptionalAmount &Amt = ParseAmount(I, E);
if (I == E) {
// No more characters left?
H.HandleIncompleteSpecifier(Start, E - Start);
return true;
}
if (Amt.getHowSpecified() == OptionalAmount::Constant && *(I++) == '$') {
// Warn that positional arguments are non-standard.
H.HandlePosition(Start, I - Start);
// Special case: '%0$', since this is an easy mistake.
if (Amt.getConstantAmount() == 0) {
H.HandleZeroPosition(Start, I - Start);
return true;
}
FS.setArgIndex(Amt.getConstantAmount() - 1);
FS.setUsesPositionalArg();
// Update the caller's pointer if we decided to consume
// these characters.
Beg = I;
return false;
}
return false;
}
bool
clang::analyze_format_string::ParseVectorModifier(FormatStringHandler &H,
FormatSpecifier &FS,
const char *&I,
const char *E,
const LangOptions &LO) {
if (!LO.OpenCL)
return false;
const char *Start = I;
if (*I == 'v') {
++I;
if (I == E) {
H.HandleIncompleteSpecifier(Start, E - Start);
return true;
}
OptionalAmount NumElts = ParseAmount(I, E);
if (NumElts.getHowSpecified() != OptionalAmount::Constant) {
H.HandleIncompleteSpecifier(Start, E - Start);
return true;
}
FS.setVectorNumElts(NumElts);
}
return false;
}
bool
clang::analyze_format_string::ParseLengthModifier(FormatSpecifier &FS,
const char *&I,
const char *E,
const LangOptions &LO,
bool IsScanf) {
LengthModifier::Kind lmKind = LengthModifier::None;
const char *lmPosition = I;
switch (*I) {
default:
return false;
case 'h':
++I;
if (I != E && *I == 'h') {
++I;
lmKind = LengthModifier::AsChar;
} else if (I != E && *I == 'l' && LO.OpenCL) {
++I;
lmKind = LengthModifier::AsShortLong;
} else {
lmKind = LengthModifier::AsShort;
}
break;
case 'l':
++I;
if (I != E && *I == 'l') {
++I;
lmKind = LengthModifier::AsLongLong;
} else {
lmKind = LengthModifier::AsLong;
}
break;
case 'j': lmKind = LengthModifier::AsIntMax; ++I; break;
case 'z': lmKind = LengthModifier::AsSizeT; ++I; break;
case 't': lmKind = LengthModifier::AsPtrDiff; ++I; break;
case 'L': lmKind = LengthModifier::AsLongDouble; ++I; break;
case 'q': lmKind = LengthModifier::AsQuad; ++I; break;
case 'a':
if (IsScanf && !LO.C99 && !LO.CPlusPlus11) {
// For scanf in C90, look at the next character to see if this should
// be parsed as the GNU extension 'a' length modifier. If not, this
// will be parsed as a conversion specifier.
++I;
if (I != E && (*I == 's' || *I == 'S' || *I == '[')) {
lmKind = LengthModifier::AsAllocate;
break;
}
--I;
}
return false;
case 'm':
if (IsScanf) {
lmKind = LengthModifier::AsMAllocate;
++I;
break;
}
return false;
// printf: AsInt64, AsInt32, AsInt3264
// scanf: AsInt64
case 'I':
if (I + 1 != E && I + 2 != E) {
if (I[1] == '6' && I[2] == '4') {
I += 3;
lmKind = LengthModifier::AsInt64;
break;
}
if (IsScanf)
return false;
if (I[1] == '3' && I[2] == '2') {
I += 3;
lmKind = LengthModifier::AsInt32;
break;
}
}
++I;
lmKind = LengthModifier::AsInt3264;
break;
case 'w':
lmKind = LengthModifier::AsWide; ++I; break;
}
LengthModifier lm(lmPosition, lmKind);
FS.setLengthModifier(lm);
return true;
}
bool clang::analyze_format_string::ParseUTF8InvalidSpecifier(
const char *SpecifierBegin, const char *FmtStrEnd, unsigned &Len) {
if (SpecifierBegin + 1 >= FmtStrEnd)
return false;
const llvm::UTF8 *SB =
reinterpret_cast<const llvm::UTF8 *>(SpecifierBegin + 1);
const llvm::UTF8 *SE = reinterpret_cast<const llvm::UTF8 *>(FmtStrEnd);
const char FirstByte = *SB;
// If the invalid specifier is a multibyte UTF-8 string, return the
// total length accordingly so that the conversion specifier can be
// properly updated to reflect a complete UTF-8 specifier.
unsigned NumBytes = llvm::getNumBytesForUTF8(FirstByte);
if (NumBytes == 1)
return false;
if (SB + NumBytes > SE)
return false;
Len = NumBytes + 1;
return true;
}
//===----------------------------------------------------------------------===//
// Methods on ArgType.
//===----------------------------------------------------------------------===//
clang::analyze_format_string::ArgType::MatchKind
ArgType::matchesType(ASTContext &C, QualType argTy) const {
if (Ptr) {
// It has to be a pointer.
const PointerType *PT = argTy->getAs<PointerType>();
if (!PT)
return NoMatch;
// We cannot write through a const qualified pointer.
if (PT->getPointeeType().isConstQualified())
return NoMatch;
argTy = PT->getPointeeType();
}
switch (K) {
case InvalidTy:
llvm_unreachable("ArgType must be valid");
case UnknownTy:
return Match;
case AnyCharTy: {
if (const EnumType *ETy = argTy->getAs<EnumType>()) {
// If the enum is incomplete we know nothing about the underlying type.
// Assume that it's 'int'.
if (!ETy->getDecl()->isComplete())
return NoMatch;
argTy = ETy->getDecl()->getIntegerType();
}
if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
switch (BT->getKind()) {
default:
break;
case BuiltinType::Char_S:
case BuiltinType::SChar:
case BuiltinType::UChar:
case BuiltinType::Char_U:
case BuiltinType::Bool:
return Match;
}
return NoMatch;
}
case SpecificTy: {
if (const EnumType *ETy = argTy->getAs<EnumType>()) {
// If the enum is incomplete we know nothing about the underlying type.
// Assume that it's 'int'.
if (!ETy->getDecl()->isComplete())
argTy = C.IntTy;
else
argTy = ETy->getDecl()->getIntegerType();
}
argTy = C.getCanonicalType(argTy).getUnqualifiedType();
if (T == argTy)
return Match;
// Check for "compatible types".
if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
switch (BT->getKind()) {
default:
break;
case BuiltinType::Char_S:
case BuiltinType::SChar:
case BuiltinType::Char_U:
case BuiltinType::UChar:
case BuiltinType::Bool:
if (T == C.UnsignedShortTy || T == C.ShortTy)
return NoMatchTypeConfusion;
return T == C.UnsignedCharTy || T == C.SignedCharTy ? Match
: NoMatch;
case BuiltinType::Short:
return T == C.UnsignedShortTy ? Match : NoMatch;
case BuiltinType::UShort:
return T == C.ShortTy ? Match : NoMatch;
case BuiltinType::Int:
return T == C.UnsignedIntTy ? Match : NoMatch;
case BuiltinType::UInt:
return T == C.IntTy ? Match : NoMatch;
case BuiltinType::Long:
return T == C.UnsignedLongTy ? Match : NoMatch;
case BuiltinType::ULong:
return T == C.LongTy ? Match : NoMatch;
case BuiltinType::LongLong:
return T == C.UnsignedLongLongTy ? Match : NoMatch;
case BuiltinType::ULongLong:
return T == C.LongLongTy ? Match : NoMatch;
}
return NoMatch;
}
case CStrTy: {
const PointerType *PT = argTy->getAs<PointerType>();
if (!PT)
return NoMatch;
QualType pointeeTy = PT->getPointeeType();
if (const BuiltinType *BT = pointeeTy->getAs<BuiltinType>())
switch (BT->getKind()) {
case BuiltinType::Char_U:
case BuiltinType::UChar:
case BuiltinType::Char_S:
case BuiltinType::SChar:
return Match;
default:
break;
}
return NoMatch;
}
case WCStrTy: {
const PointerType *PT = argTy->getAs<PointerType>();
if (!PT)
return NoMatch;
QualType pointeeTy =
C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
return pointeeTy == C.getWideCharType() ? Match : NoMatch;
}
case WIntTy: {
QualType WInt = C.getCanonicalType(C.getWIntType()).getUnqualifiedType();
if (C.getCanonicalType(argTy).getUnqualifiedType() == WInt)
return Match;
QualType PromoArg = argTy->isPromotableIntegerType()
? C.getPromotedIntegerType(argTy)
: argTy;
PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();
// If the promoted argument is the corresponding signed type of the
// wint_t type, then it should match.
if (PromoArg->hasSignedIntegerRepresentation() &&
C.getCorrespondingUnsignedType(PromoArg) == WInt)
return Match;
return WInt == PromoArg ? Match : NoMatch;
}
case CPointerTy:
if (argTy->isVoidPointerType()) {
return Match;
} if (argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
argTy->isBlockPointerType() || argTy->isNullPtrType()) {
return NoMatchPedantic;
} else {
return NoMatch;
}
case ObjCPointerTy: {
if (argTy->getAs<ObjCObjectPointerType>() ||
argTy->getAs<BlockPointerType>())
return Match;
// Handle implicit toll-free bridging.
if (const PointerType *PT = argTy->getAs<PointerType>()) {
// Things such as CFTypeRef are really just opaque pointers
// to C structs representing CF types that can often be bridged
// to Objective-C objects. Since the compiler doesn't know which
// structs can be toll-free bridged, we just accept them all.
QualType pointee = PT->getPointeeType();
if (pointee->getAsStructureType() || pointee->isVoidType())
return Match;
}
return NoMatch;
}
}
llvm_unreachable("Invalid ArgType Kind!");
}
ArgType ArgType::makeVectorType(ASTContext &C, unsigned NumElts) const {
// Check for valid vector element types.
if (T.isNull())
return ArgType::Invalid();
QualType Vec = C.getExtVectorType(T, NumElts);
return ArgType(Vec, Name);
}
QualType ArgType::getRepresentativeType(ASTContext &C) const {
QualType Res;
switch (K) {
case InvalidTy:
llvm_unreachable("No representative type for Invalid ArgType");
case UnknownTy:
llvm_unreachable("No representative type for Unknown ArgType");
case AnyCharTy:
Res = C.CharTy;
break;
case SpecificTy:
Res = T;
break;
case CStrTy:
Res = C.getPointerType(C.CharTy);
break;
case WCStrTy:
Res = C.getPointerType(C.getWideCharType());
break;
case ObjCPointerTy:
Res = C.ObjCBuiltinIdTy;
break;
case CPointerTy:
Res = C.VoidPtrTy;
break;
case WIntTy: {
Res = C.getWIntType();
break;
}
}
if (Ptr)
Res = C.getPointerType(Res);
return Res;
}
std::string ArgType::getRepresentativeTypeName(ASTContext &C) const {
std::string S = getRepresentativeType(C).getAsString(C.getPrintingPolicy());
std::string Alias;
if (Name) {
// Use a specific name for this type, e.g. "size_t".
Alias = Name;
if (Ptr) {
// If ArgType is actually a pointer to T, append an asterisk.
Alias += (Alias[Alias.size()-1] == '*') ? "*" : " *";
}
// If Alias is the same as the underlying type, e.g. wchar_t, then drop it.
if (S == Alias)
Alias.clear();
}
if (!Alias.empty())
return std::string("'") + Alias + "' (aka '" + S + "')";
return std::string("'") + S + "'";
}
//===----------------------------------------------------------------------===//
// Methods on OptionalAmount.
//===----------------------------------------------------------------------===//
ArgType
analyze_format_string::OptionalAmount::getArgType(ASTContext &Ctx) const {
return Ctx.IntTy;
}
//===----------------------------------------------------------------------===//
// Methods on LengthModifier.
//===----------------------------------------------------------------------===//
const char *
analyze_format_string::LengthModifier::toString() const {
switch (kind) {
case AsChar:
return "hh";
case AsShort:
return "h";
case AsShortLong:
return "hl";
case AsLong: // or AsWideChar
return "l";
case AsLongLong:
return "ll";
case AsQuad:
return "q";
case AsIntMax:
return "j";
case AsSizeT:
return "z";
case AsPtrDiff:
return "t";
case AsInt32:
return "I32";
case AsInt3264:
return "I";
case AsInt64:
return "I64";
case AsLongDouble:
return "L";
case AsAllocate:
return "a";
case AsMAllocate:
return "m";
case AsWide:
return "w";
case None:
return "";
}
return nullptr;
}
//===----------------------------------------------------------------------===//
// Methods on ConversionSpecifier.
//===----------------------------------------------------------------------===//
const char *ConversionSpecifier::toString() const {
switch (kind) {
case dArg: return "d";
case DArg: return "D";
case iArg: return "i";
case oArg: return "o";
case OArg: return "O";
case uArg: return "u";
case UArg: return "U";
case xArg: return "x";
case XArg: return "X";
case fArg: return "f";
case FArg: return "F";
case eArg: return "e";
case EArg: return "E";
case gArg: return "g";
case GArg: return "G";
case aArg: return "a";
case AArg: return "A";
case cArg: return "c";
case sArg: return "s";
case pArg: return "p";
case PArg:
return "P";
case nArg: return "n";
case PercentArg: return "%";
case ScanListArg: return "[";
case InvalidSpecifier: return nullptr;
// POSIX unicode extensions.
case CArg: return "C";
case SArg: return "S";
// Objective-C specific specifiers.
case ObjCObjArg: return "@";
// FreeBSD kernel specific specifiers.
case FreeBSDbArg: return "b";
case FreeBSDDArg: return "D";
case FreeBSDrArg: return "r";
case FreeBSDyArg: return "y";
// GlibC specific specifiers.
case PrintErrno: return "m";
// MS specific specifiers.
case ZArg: return "Z";
}
return nullptr;
}
Optional<ConversionSpecifier>
ConversionSpecifier::getStandardSpecifier() const {
ConversionSpecifier::Kind NewKind;
switch (getKind()) {
default:
return None;
case DArg:
NewKind = dArg;
break;
case UArg:
NewKind = uArg;
break;
case OArg:
NewKind = oArg;
break;
}
ConversionSpecifier FixedCS(*this);
FixedCS.setKind(NewKind);
return FixedCS;
}
//===----------------------------------------------------------------------===//
// Methods on OptionalAmount.
//===----------------------------------------------------------------------===//
void OptionalAmount::toString(raw_ostream &os) const {
switch (hs) {
case Invalid:
case NotSpecified:
return;
case Arg:
if (UsesDotPrefix)
os << ".";
if (usesPositionalArg())
os << "*" << getPositionalArgIndex() << "$";
else
os << "*";
break;
case Constant:
if (UsesDotPrefix)
os << ".";
os << amt;
break;
}
}
bool FormatSpecifier::hasValidLengthModifier(const TargetInfo &Target,
const LangOptions &LO) const {
switch (LM.getKind()) {
case LengthModifier::None:
return true;
// Handle most integer flags
case LengthModifier::AsShort:
// Length modifier only applies to FP vectors.
if (LO.OpenCL && CS.isDoubleArg())
return !VectorNumElts.isInvalid();
if (Target.getTriple().isOSMSVCRT()) {
switch (CS.getKind()) {
case ConversionSpecifier::cArg:
case ConversionSpecifier::CArg:
case ConversionSpecifier::sArg:
case ConversionSpecifier::SArg:
case ConversionSpecifier::ZArg:
return true;
default:
break;
}
}
LLVM_FALLTHROUGH;
case LengthModifier::AsChar:
case LengthModifier::AsLongLong:
case LengthModifier::AsQuad:
case LengthModifier::AsIntMax:
case LengthModifier::AsSizeT:
case LengthModifier::AsPtrDiff:
switch (CS.getKind()) {
case ConversionSpecifier::dArg:
case ConversionSpecifier::DArg:
case ConversionSpecifier::iArg:
case ConversionSpecifier::oArg:
case ConversionSpecifier::OArg:
case ConversionSpecifier::uArg:
case ConversionSpecifier::UArg:
case ConversionSpecifier::xArg:
case ConversionSpecifier::XArg:
case ConversionSpecifier::nArg:
return true;
case ConversionSpecifier::FreeBSDrArg:
case ConversionSpecifier::FreeBSDyArg:
return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS();
default:
return false;
}
case LengthModifier::AsShortLong:
return LO.OpenCL && !VectorNumElts.isInvalid();
// Handle 'l' flag
case LengthModifier::AsLong: // or AsWideChar
if (CS.isDoubleArg()) {
// Invalid for OpenCL FP scalars.
if (LO.OpenCL && VectorNumElts.isInvalid())
return false;
return true;
}
switch (CS.getKind()) {
case ConversionSpecifier::dArg:
case ConversionSpecifier::DArg:
case ConversionSpecifier::iArg:
case ConversionSpecifier::oArg:
case ConversionSpecifier::OArg:
case ConversionSpecifier::uArg:
case ConversionSpecifier::UArg:
case ConversionSpecifier::xArg:
case ConversionSpecifier::XArg:
case ConversionSpecifier::nArg:
case ConversionSpecifier::cArg:
case ConversionSpecifier::sArg:
case ConversionSpecifier::ScanListArg:
case ConversionSpecifier::ZArg:
return true;
case ConversionSpecifier::FreeBSDrArg:
case ConversionSpecifier::FreeBSDyArg:
return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS();
default:
return false;
}
case LengthModifier::AsLongDouble:
switch (CS.getKind()) {
case ConversionSpecifier::aArg:
case ConversionSpecifier::AArg:
case ConversionSpecifier::fArg:
case ConversionSpecifier::FArg:
case ConversionSpecifier::eArg:
case ConversionSpecifier::EArg:
case ConversionSpecifier::gArg:
case ConversionSpecifier::GArg:
return true;
// GNU libc extension.
case ConversionSpecifier::dArg:
case ConversionSpecifier::iArg:
case ConversionSpecifier::oArg:
case ConversionSpecifier::uArg:
case ConversionSpecifier::xArg:
case ConversionSpecifier::XArg:
return !Target.getTriple().isOSDarwin() &&
!Target.getTriple().isOSWindows();
default:
return false;
}
case LengthModifier::AsAllocate:
switch (CS.getKind()) {
case ConversionSpecifier::sArg:
case ConversionSpecifier::SArg:
case ConversionSpecifier::ScanListArg:
return true;
default:
return false;
}
case LengthModifier::AsMAllocate:
switch (CS.getKind()) {
case ConversionSpecifier::cArg:
case ConversionSpecifier::CArg:
case ConversionSpecifier::sArg:
case ConversionSpecifier::SArg:
case ConversionSpecifier::ScanListArg:
return true;
default:
return false;
}
case LengthModifier::AsInt32:
case LengthModifier::AsInt3264:
case LengthModifier::AsInt64:
switch (CS.getKind()) {
case ConversionSpecifier::dArg:
case ConversionSpecifier::iArg:
case ConversionSpecifier::oArg:
case ConversionSpecifier::uArg:
case ConversionSpecifier::xArg:
case ConversionSpecifier::XArg:
return Target.getTriple().isOSMSVCRT();
default:
return false;
}
case LengthModifier::AsWide:
switch (CS.getKind()) {
case ConversionSpecifier::cArg:
case ConversionSpecifier::CArg:
case ConversionSpecifier::sArg:
case ConversionSpecifier::SArg:
case ConversionSpecifier::ZArg:
return Target.getTriple().isOSMSVCRT();
default:
return false;
}
}
llvm_unreachable("Invalid LengthModifier Kind!");
}
bool FormatSpecifier::hasStandardLengthModifier() const {
switch (LM.getKind()) {
case LengthModifier::None:
case LengthModifier::AsChar:
case LengthModifier::AsShort:
case LengthModifier::AsLong:
case LengthModifier::AsLongLong:
case LengthModifier::AsIntMax:
case LengthModifier::AsSizeT:
case LengthModifier::AsPtrDiff:
case LengthModifier::AsLongDouble:
return true;
case LengthModifier::AsAllocate:
case LengthModifier::AsMAllocate:
case LengthModifier::AsQuad:
case LengthModifier::AsInt32:
case LengthModifier::AsInt3264:
case LengthModifier::AsInt64:
case LengthModifier::AsWide:
case LengthModifier::AsShortLong: // ???
return false;
}
llvm_unreachable("Invalid LengthModifier Kind!");
}
bool FormatSpecifier::hasStandardConversionSpecifier(
const LangOptions &LangOpt) const {
switch (CS.getKind()) {
case ConversionSpecifier::cArg:
case ConversionSpecifier::dArg:
case ConversionSpecifier::iArg:
case ConversionSpecifier::oArg:
case ConversionSpecifier::uArg:
case ConversionSpecifier::xArg:
case ConversionSpecifier::XArg:
case ConversionSpecifier::fArg:
case ConversionSpecifier::FArg:
case ConversionSpecifier::eArg:
case ConversionSpecifier::EArg:
case ConversionSpecifier::gArg:
case ConversionSpecifier::GArg:
case ConversionSpecifier::aArg:
case ConversionSpecifier::AArg:
case ConversionSpecifier::sArg:
case ConversionSpecifier::pArg:
case ConversionSpecifier::nArg:
case ConversionSpecifier::ObjCObjArg:
case ConversionSpecifier::ScanListArg:
case ConversionSpecifier::PercentArg:
case ConversionSpecifier::PArg:
return true;
case ConversionSpecifier::CArg:
case ConversionSpecifier::SArg:
return LangOpt.ObjC;
case ConversionSpecifier::InvalidSpecifier:
case ConversionSpecifier::FreeBSDbArg:
case ConversionSpecifier::FreeBSDDArg:
case ConversionSpecifier::FreeBSDrArg:
case ConversionSpecifier::FreeBSDyArg:
case ConversionSpecifier::PrintErrno:
case ConversionSpecifier::DArg:
case ConversionSpecifier::OArg:
case ConversionSpecifier::UArg:
case ConversionSpecifier::ZArg:
return false;
}
llvm_unreachable("Invalid ConversionSpecifier Kind!");
}
bool FormatSpecifier::hasStandardLengthConversionCombination() const {
if (LM.getKind() == LengthModifier::AsLongDouble) {
switch(CS.getKind()) {
case ConversionSpecifier::dArg:
case ConversionSpecifier::iArg:
case ConversionSpecifier::oArg:
case ConversionSpecifier::uArg:
case ConversionSpecifier::xArg:
case ConversionSpecifier::XArg:
return false;
default:
return true;
}
}
return true;
}
Optional<LengthModifier> FormatSpecifier::getCorrectedLengthModifier() const {
if (CS.isAnyIntArg() || CS.getKind() == ConversionSpecifier::nArg) {
if (LM.getKind() == LengthModifier::AsLongDouble ||
LM.getKind() == LengthModifier::AsQuad) {
LengthModifier FixedLM(LM);
FixedLM.setKind(LengthModifier::AsLongLong);
return FixedLM;
}
}
return None;
}
bool FormatSpecifier::namedTypeToLengthModifier(QualType QT,
LengthModifier &LM) {
assert(isa<TypedefType>(QT) && "Expected a TypedefType");
const TypedefNameDecl *Typedef = cast<TypedefType>(QT)->getDecl();
for (;;) {
const IdentifierInfo *Identifier = Typedef->getIdentifier();
if (Identifier->getName() == "size_t") {
LM.setKind(LengthModifier::AsSizeT);
return true;
} else if (Identifier->getName() == "ssize_t") {
// Not C99, but common in Unix.
LM.setKind(LengthModifier::AsSizeT);
return true;
} else if (Identifier->getName() == "intmax_t") {
LM.setKind(LengthModifier::AsIntMax);
return true;
} else if (Identifier->getName() == "uintmax_t") {
LM.setKind(LengthModifier::AsIntMax);
return true;
} else if (Identifier->getName() == "ptrdiff_t") {
LM.setKind(LengthModifier::AsPtrDiff);
return true;
}
QualType T = Typedef->getUnderlyingType();
if (!isa<TypedefType>(T))
break;
Typedef = cast<TypedefType>(T)->getDecl();
}
return false;
}