forked from OSchip/llvm-project
940 lines
30 KiB
C++
940 lines
30 KiB
C++
//== PrintfFormatString.cpp - Analysis of printf format strings --*- C++ -*-==//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Handling of format string in printf and friends. The structure of format
|
|
// strings for fprintf() are described in C99 7.19.6.1.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "clang/Analysis/Analyses/FormatString.h"
|
|
#include "FormatStringParsing.h"
|
|
#include "clang/Basic/TargetInfo.h"
|
|
|
|
using clang::analyze_format_string::ArgType;
|
|
using clang::analyze_format_string::FormatStringHandler;
|
|
using clang::analyze_format_string::LengthModifier;
|
|
using clang::analyze_format_string::OptionalAmount;
|
|
using clang::analyze_format_string::ConversionSpecifier;
|
|
using clang::analyze_printf::PrintfSpecifier;
|
|
|
|
using namespace clang;
|
|
|
|
typedef clang::analyze_format_string::SpecifierResult<PrintfSpecifier>
|
|
PrintfSpecifierResult;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Methods for parsing format strings.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
using analyze_format_string::ParseNonPositionAmount;
|
|
|
|
static bool ParsePrecision(FormatStringHandler &H, PrintfSpecifier &FS,
|
|
const char *Start, const char *&Beg, const char *E,
|
|
unsigned *argIndex) {
|
|
if (argIndex) {
|
|
FS.setPrecision(ParseNonPositionAmount(Beg, E, *argIndex));
|
|
} else {
|
|
const OptionalAmount Amt = ParsePositionAmount(H, Start, Beg, E,
|
|
analyze_format_string::PrecisionPos);
|
|
if (Amt.isInvalid())
|
|
return true;
|
|
FS.setPrecision(Amt);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool ParseObjCFlags(FormatStringHandler &H, PrintfSpecifier &FS,
|
|
const char *FlagBeg, const char *E, bool Warn) {
|
|
StringRef Flag(FlagBeg, E - FlagBeg);
|
|
// Currently there is only one flag.
|
|
if (Flag == "tt") {
|
|
FS.setHasObjCTechnicalTerm(FlagBeg);
|
|
return false;
|
|
}
|
|
// Handle either the case of no flag or an invalid flag.
|
|
if (Warn) {
|
|
if (Flag == "")
|
|
H.HandleEmptyObjCModifierFlag(FlagBeg, E - FlagBeg);
|
|
else
|
|
H.HandleInvalidObjCModifierFlag(FlagBeg, E - FlagBeg);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static PrintfSpecifierResult ParsePrintfSpecifier(FormatStringHandler &H,
|
|
const char *&Beg,
|
|
const char *E,
|
|
unsigned &argIndex,
|
|
const LangOptions &LO,
|
|
const TargetInfo &Target,
|
|
bool Warn,
|
|
bool isFreeBSDKPrintf) {
|
|
|
|
using namespace clang::analyze_format_string;
|
|
using namespace clang::analyze_printf;
|
|
|
|
const char *I = Beg;
|
|
const char *Start = nullptr;
|
|
UpdateOnReturn <const char*> UpdateBeg(Beg, I);
|
|
|
|
// Look for a '%' character that indicates the start of a format specifier.
|
|
for ( ; I != E ; ++I) {
|
|
char c = *I;
|
|
if (c == '\0') {
|
|
// Detect spurious null characters, which are likely errors.
|
|
H.HandleNullChar(I);
|
|
return true;
|
|
}
|
|
if (c == '%') {
|
|
Start = I++; // Record the start of the format specifier.
|
|
break;
|
|
}
|
|
}
|
|
|
|
// No format specifier found?
|
|
if (!Start)
|
|
return false;
|
|
|
|
if (I == E) {
|
|
// No more characters left?
|
|
if (Warn)
|
|
H.HandleIncompleteSpecifier(Start, E - Start);
|
|
return true;
|
|
}
|
|
|
|
PrintfSpecifier FS;
|
|
if (ParseArgPosition(H, FS, Start, I, E))
|
|
return true;
|
|
|
|
if (I == E) {
|
|
// No more characters left?
|
|
if (Warn)
|
|
H.HandleIncompleteSpecifier(Start, E - Start);
|
|
return true;
|
|
}
|
|
|
|
// Look for flags (if any).
|
|
bool hasMore = true;
|
|
for ( ; I != E; ++I) {
|
|
switch (*I) {
|
|
default: hasMore = false; break;
|
|
case '\'':
|
|
// FIXME: POSIX specific. Always accept?
|
|
FS.setHasThousandsGrouping(I);
|
|
break;
|
|
case '-': FS.setIsLeftJustified(I); break;
|
|
case '+': FS.setHasPlusPrefix(I); break;
|
|
case ' ': FS.setHasSpacePrefix(I); break;
|
|
case '#': FS.setHasAlternativeForm(I); break;
|
|
case '0': FS.setHasLeadingZeros(I); break;
|
|
}
|
|
if (!hasMore)
|
|
break;
|
|
}
|
|
|
|
if (I == E) {
|
|
// No more characters left?
|
|
if (Warn)
|
|
H.HandleIncompleteSpecifier(Start, E - Start);
|
|
return true;
|
|
}
|
|
|
|
// Look for the field width (if any).
|
|
if (ParseFieldWidth(H, FS, Start, I, E,
|
|
FS.usesPositionalArg() ? nullptr : &argIndex))
|
|
return true;
|
|
|
|
if (I == E) {
|
|
// No more characters left?
|
|
if (Warn)
|
|
H.HandleIncompleteSpecifier(Start, E - Start);
|
|
return true;
|
|
}
|
|
|
|
// Look for the precision (if any).
|
|
if (*I == '.') {
|
|
++I;
|
|
if (I == E) {
|
|
if (Warn)
|
|
H.HandleIncompleteSpecifier(Start, E - Start);
|
|
return true;
|
|
}
|
|
|
|
if (ParsePrecision(H, FS, Start, I, E,
|
|
FS.usesPositionalArg() ? nullptr : &argIndex))
|
|
return true;
|
|
|
|
if (I == E) {
|
|
// No more characters left?
|
|
if (Warn)
|
|
H.HandleIncompleteSpecifier(Start, E - Start);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Look for the length modifier.
|
|
if (ParseLengthModifier(FS, I, E, LO) && I == E) {
|
|
// No more characters left?
|
|
if (Warn)
|
|
H.HandleIncompleteSpecifier(Start, E - Start);
|
|
return true;
|
|
}
|
|
|
|
// Look for the Objective-C modifier flags, if any.
|
|
// We parse these here, even if they don't apply to
|
|
// the conversion specifier, and then emit an error
|
|
// later if the conversion specifier isn't '@'. This
|
|
// enables better recovery, and we don't know if
|
|
// these flags are applicable until later.
|
|
const char *ObjCModifierFlagsStart = nullptr,
|
|
*ObjCModifierFlagsEnd = nullptr;
|
|
if (*I == '[') {
|
|
ObjCModifierFlagsStart = I;
|
|
++I;
|
|
auto flagStart = I;
|
|
for (;; ++I) {
|
|
ObjCModifierFlagsEnd = I;
|
|
if (I == E) {
|
|
if (Warn)
|
|
H.HandleIncompleteSpecifier(Start, E - Start);
|
|
return true;
|
|
}
|
|
// Did we find the closing ']'?
|
|
if (*I == ']') {
|
|
if (ParseObjCFlags(H, FS, flagStart, I, Warn))
|
|
return true;
|
|
++I;
|
|
break;
|
|
}
|
|
// There are no separators defined yet for multiple
|
|
// Objective-C modifier flags. When those are
|
|
// defined, this is the place to check.
|
|
}
|
|
}
|
|
|
|
if (*I == '\0') {
|
|
// Detect spurious null characters, which are likely errors.
|
|
H.HandleNullChar(I);
|
|
return true;
|
|
}
|
|
|
|
// Finally, look for the conversion specifier.
|
|
const char *conversionPosition = I++;
|
|
ConversionSpecifier::Kind k = ConversionSpecifier::InvalidSpecifier;
|
|
switch (*conversionPosition) {
|
|
default:
|
|
break;
|
|
// C99: 7.19.6.1 (section 8).
|
|
case '%': k = ConversionSpecifier::PercentArg; break;
|
|
case 'A': k = ConversionSpecifier::AArg; break;
|
|
case 'E': k = ConversionSpecifier::EArg; break;
|
|
case 'F': k = ConversionSpecifier::FArg; break;
|
|
case 'G': k = ConversionSpecifier::GArg; break;
|
|
case 'X': k = ConversionSpecifier::XArg; break;
|
|
case 'a': k = ConversionSpecifier::aArg; break;
|
|
case 'c': k = ConversionSpecifier::cArg; break;
|
|
case 'd': k = ConversionSpecifier::dArg; break;
|
|
case 'e': k = ConversionSpecifier::eArg; break;
|
|
case 'f': k = ConversionSpecifier::fArg; break;
|
|
case 'g': k = ConversionSpecifier::gArg; break;
|
|
case 'i': k = ConversionSpecifier::iArg; break;
|
|
case 'n': k = ConversionSpecifier::nArg; break;
|
|
case 'o': k = ConversionSpecifier::oArg; break;
|
|
case 'p': k = ConversionSpecifier::pArg; break;
|
|
case 's': k = ConversionSpecifier::sArg; break;
|
|
case 'u': k = ConversionSpecifier::uArg; break;
|
|
case 'x': k = ConversionSpecifier::xArg; break;
|
|
// POSIX specific.
|
|
case 'C': k = ConversionSpecifier::CArg; break;
|
|
case 'S': k = ConversionSpecifier::SArg; break;
|
|
// Objective-C.
|
|
case '@': k = ConversionSpecifier::ObjCObjArg; break;
|
|
// Glibc specific.
|
|
case 'm': k = ConversionSpecifier::PrintErrno; break;
|
|
// FreeBSD kernel specific.
|
|
case 'b':
|
|
if (isFreeBSDKPrintf)
|
|
k = ConversionSpecifier::FreeBSDbArg; // int followed by char *
|
|
break;
|
|
case 'r':
|
|
if (isFreeBSDKPrintf)
|
|
k = ConversionSpecifier::FreeBSDrArg; // int
|
|
break;
|
|
case 'y':
|
|
if (isFreeBSDKPrintf)
|
|
k = ConversionSpecifier::FreeBSDyArg; // int
|
|
break;
|
|
// Apple-specific.
|
|
case 'D':
|
|
if (isFreeBSDKPrintf)
|
|
k = ConversionSpecifier::FreeBSDDArg; // void * followed by char *
|
|
else if (Target.getTriple().isOSDarwin())
|
|
k = ConversionSpecifier::DArg;
|
|
break;
|
|
case 'O':
|
|
if (Target.getTriple().isOSDarwin())
|
|
k = ConversionSpecifier::OArg;
|
|
break;
|
|
case 'U':
|
|
if (Target.getTriple().isOSDarwin())
|
|
k = ConversionSpecifier::UArg;
|
|
break;
|
|
// MS specific.
|
|
case 'Z':
|
|
if (Target.getTriple().isOSMSVCRT())
|
|
k = ConversionSpecifier::ZArg;
|
|
}
|
|
|
|
// Check to see if we used the Objective-C modifier flags with
|
|
// a conversion specifier other than '@'.
|
|
if (k != ConversionSpecifier::ObjCObjArg &&
|
|
k != ConversionSpecifier::InvalidSpecifier &&
|
|
ObjCModifierFlagsStart) {
|
|
H.HandleObjCFlagsWithNonObjCConversion(ObjCModifierFlagsStart,
|
|
ObjCModifierFlagsEnd + 1,
|
|
conversionPosition);
|
|
return true;
|
|
}
|
|
|
|
PrintfConversionSpecifier CS(conversionPosition, k);
|
|
FS.setConversionSpecifier(CS);
|
|
if (CS.consumesDataArgument() && !FS.usesPositionalArg())
|
|
FS.setArgIndex(argIndex++);
|
|
// FreeBSD kernel specific.
|
|
if (k == ConversionSpecifier::FreeBSDbArg ||
|
|
k == ConversionSpecifier::FreeBSDDArg)
|
|
argIndex++;
|
|
|
|
if (k == ConversionSpecifier::InvalidSpecifier) {
|
|
unsigned Len = I - Start;
|
|
if (ParseUTF8InvalidSpecifier(Start, E, Len)) {
|
|
CS.setEndScanList(Start + Len);
|
|
FS.setConversionSpecifier(CS);
|
|
}
|
|
// Assume the conversion takes one argument.
|
|
return !H.HandleInvalidPrintfConversionSpecifier(FS, Start, Len);
|
|
}
|
|
return PrintfSpecifierResult(Start, FS);
|
|
}
|
|
|
|
bool clang::analyze_format_string::ParsePrintfString(FormatStringHandler &H,
|
|
const char *I,
|
|
const char *E,
|
|
const LangOptions &LO,
|
|
const TargetInfo &Target,
|
|
bool isFreeBSDKPrintf) {
|
|
|
|
unsigned argIndex = 0;
|
|
|
|
// Keep looking for a format specifier until we have exhausted the string.
|
|
while (I != E) {
|
|
const PrintfSpecifierResult &FSR = ParsePrintfSpecifier(H, I, E, argIndex,
|
|
LO, Target, true,
|
|
isFreeBSDKPrintf);
|
|
// Did a fail-stop error of any kind occur when parsing the specifier?
|
|
// If so, don't do any more processing.
|
|
if (FSR.shouldStop())
|
|
return true;
|
|
// Did we exhaust the string or encounter an error that
|
|
// we can recover from?
|
|
if (!FSR.hasValue())
|
|
continue;
|
|
// We have a format specifier. Pass it to the callback.
|
|
if (!H.HandlePrintfSpecifier(FSR.getValue(), FSR.getStart(),
|
|
I - FSR.getStart()))
|
|
return true;
|
|
}
|
|
assert(I == E && "Format string not exhausted");
|
|
return false;
|
|
}
|
|
|
|
bool clang::analyze_format_string::ParseFormatStringHasSArg(const char *I,
|
|
const char *E,
|
|
const LangOptions &LO,
|
|
const TargetInfo &Target) {
|
|
|
|
unsigned argIndex = 0;
|
|
|
|
// Keep looking for a %s format specifier until we have exhausted the string.
|
|
FormatStringHandler H;
|
|
while (I != E) {
|
|
const PrintfSpecifierResult &FSR = ParsePrintfSpecifier(H, I, E, argIndex,
|
|
LO, Target, false,
|
|
false);
|
|
// Did a fail-stop error of any kind occur when parsing the specifier?
|
|
// If so, don't do any more processing.
|
|
if (FSR.shouldStop())
|
|
return false;
|
|
// Did we exhaust the string or encounter an error that
|
|
// we can recover from?
|
|
if (!FSR.hasValue())
|
|
continue;
|
|
const analyze_printf::PrintfSpecifier &FS = FSR.getValue();
|
|
// Return true if this a %s format specifier.
|
|
if (FS.getConversionSpecifier().getKind() == ConversionSpecifier::Kind::sArg)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Methods on PrintfSpecifier.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
ArgType PrintfSpecifier::getArgType(ASTContext &Ctx,
|
|
bool IsObjCLiteral) const {
|
|
const PrintfConversionSpecifier &CS = getConversionSpecifier();
|
|
|
|
if (!CS.consumesDataArgument())
|
|
return ArgType::Invalid();
|
|
|
|
if (CS.getKind() == ConversionSpecifier::cArg)
|
|
switch (LM.getKind()) {
|
|
case LengthModifier::None:
|
|
return Ctx.IntTy;
|
|
case LengthModifier::AsLong:
|
|
case LengthModifier::AsWide:
|
|
return ArgType(ArgType::WIntTy, "wint_t");
|
|
case LengthModifier::AsShort:
|
|
if (Ctx.getTargetInfo().getTriple().isOSMSVCRT())
|
|
return Ctx.IntTy;
|
|
default:
|
|
return ArgType::Invalid();
|
|
}
|
|
|
|
if (CS.isIntArg())
|
|
switch (LM.getKind()) {
|
|
case LengthModifier::AsLongDouble:
|
|
// GNU extension.
|
|
return Ctx.LongLongTy;
|
|
case LengthModifier::None:
|
|
return Ctx.IntTy;
|
|
case LengthModifier::AsInt32:
|
|
return ArgType(Ctx.IntTy, "__int32");
|
|
case LengthModifier::AsChar: return ArgType::AnyCharTy;
|
|
case LengthModifier::AsShort: return Ctx.ShortTy;
|
|
case LengthModifier::AsLong: return Ctx.LongTy;
|
|
case LengthModifier::AsLongLong:
|
|
case LengthModifier::AsQuad:
|
|
return Ctx.LongLongTy;
|
|
case LengthModifier::AsInt64:
|
|
return ArgType(Ctx.LongLongTy, "__int64");
|
|
case LengthModifier::AsIntMax:
|
|
return ArgType(Ctx.getIntMaxType(), "intmax_t");
|
|
case LengthModifier::AsSizeT:
|
|
// FIXME: How to get the corresponding signed version of size_t?
|
|
return ArgType();
|
|
case LengthModifier::AsInt3264:
|
|
return Ctx.getTargetInfo().getTriple().isArch64Bit()
|
|
? ArgType(Ctx.LongLongTy, "__int64")
|
|
: ArgType(Ctx.IntTy, "__int32");
|
|
case LengthModifier::AsPtrDiff:
|
|
return ArgType(Ctx.getPointerDiffType(), "ptrdiff_t");
|
|
case LengthModifier::AsAllocate:
|
|
case LengthModifier::AsMAllocate:
|
|
case LengthModifier::AsWide:
|
|
return ArgType::Invalid();
|
|
}
|
|
|
|
if (CS.isUIntArg())
|
|
switch (LM.getKind()) {
|
|
case LengthModifier::AsLongDouble:
|
|
// GNU extension.
|
|
return Ctx.UnsignedLongLongTy;
|
|
case LengthModifier::None:
|
|
return Ctx.UnsignedIntTy;
|
|
case LengthModifier::AsInt32:
|
|
return ArgType(Ctx.UnsignedIntTy, "unsigned __int32");
|
|
case LengthModifier::AsChar: return Ctx.UnsignedCharTy;
|
|
case LengthModifier::AsShort: return Ctx.UnsignedShortTy;
|
|
case LengthModifier::AsLong: return Ctx.UnsignedLongTy;
|
|
case LengthModifier::AsLongLong:
|
|
case LengthModifier::AsQuad:
|
|
return Ctx.UnsignedLongLongTy;
|
|
case LengthModifier::AsInt64:
|
|
return ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64");
|
|
case LengthModifier::AsIntMax:
|
|
return ArgType(Ctx.getUIntMaxType(), "uintmax_t");
|
|
case LengthModifier::AsSizeT:
|
|
return ArgType(Ctx.getSizeType(), "size_t");
|
|
case LengthModifier::AsInt3264:
|
|
return Ctx.getTargetInfo().getTriple().isArch64Bit()
|
|
? ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64")
|
|
: ArgType(Ctx.UnsignedIntTy, "unsigned __int32");
|
|
case LengthModifier::AsPtrDiff:
|
|
// FIXME: How to get the corresponding unsigned
|
|
// version of ptrdiff_t?
|
|
return ArgType();
|
|
case LengthModifier::AsAllocate:
|
|
case LengthModifier::AsMAllocate:
|
|
case LengthModifier::AsWide:
|
|
return ArgType::Invalid();
|
|
}
|
|
|
|
if (CS.isDoubleArg()) {
|
|
if (LM.getKind() == LengthModifier::AsLongDouble)
|
|
return Ctx.LongDoubleTy;
|
|
return Ctx.DoubleTy;
|
|
}
|
|
|
|
if (CS.getKind() == ConversionSpecifier::nArg) {
|
|
switch (LM.getKind()) {
|
|
case LengthModifier::None:
|
|
return ArgType::PtrTo(Ctx.IntTy);
|
|
case LengthModifier::AsChar:
|
|
return ArgType::PtrTo(Ctx.SignedCharTy);
|
|
case LengthModifier::AsShort:
|
|
return ArgType::PtrTo(Ctx.ShortTy);
|
|
case LengthModifier::AsLong:
|
|
return ArgType::PtrTo(Ctx.LongTy);
|
|
case LengthModifier::AsLongLong:
|
|
case LengthModifier::AsQuad:
|
|
return ArgType::PtrTo(Ctx.LongLongTy);
|
|
case LengthModifier::AsIntMax:
|
|
return ArgType::PtrTo(ArgType(Ctx.getIntMaxType(), "intmax_t"));
|
|
case LengthModifier::AsSizeT:
|
|
return ArgType(); // FIXME: ssize_t
|
|
case LengthModifier::AsPtrDiff:
|
|
return ArgType::PtrTo(ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"));
|
|
case LengthModifier::AsLongDouble:
|
|
return ArgType(); // FIXME: Is this a known extension?
|
|
case LengthModifier::AsAllocate:
|
|
case LengthModifier::AsMAllocate:
|
|
case LengthModifier::AsInt32:
|
|
case LengthModifier::AsInt3264:
|
|
case LengthModifier::AsInt64:
|
|
case LengthModifier::AsWide:
|
|
return ArgType::Invalid();
|
|
}
|
|
}
|
|
|
|
switch (CS.getKind()) {
|
|
case ConversionSpecifier::sArg:
|
|
if (LM.getKind() == LengthModifier::AsWideChar) {
|
|
if (IsObjCLiteral)
|
|
return ArgType(Ctx.getPointerType(Ctx.UnsignedShortTy.withConst()),
|
|
"const unichar *");
|
|
return ArgType(ArgType::WCStrTy, "wchar_t *");
|
|
}
|
|
if (LM.getKind() == LengthModifier::AsWide)
|
|
return ArgType(ArgType::WCStrTy, "wchar_t *");
|
|
return ArgType::CStrTy;
|
|
case ConversionSpecifier::SArg:
|
|
if (IsObjCLiteral)
|
|
return ArgType(Ctx.getPointerType(Ctx.UnsignedShortTy.withConst()),
|
|
"const unichar *");
|
|
if (Ctx.getTargetInfo().getTriple().isOSMSVCRT() &&
|
|
LM.getKind() == LengthModifier::AsShort)
|
|
return ArgType::CStrTy;
|
|
return ArgType(ArgType::WCStrTy, "wchar_t *");
|
|
case ConversionSpecifier::CArg:
|
|
if (IsObjCLiteral)
|
|
return ArgType(Ctx.UnsignedShortTy, "unichar");
|
|
if (Ctx.getTargetInfo().getTriple().isOSMSVCRT() &&
|
|
LM.getKind() == LengthModifier::AsShort)
|
|
return Ctx.IntTy;
|
|
return ArgType(Ctx.WideCharTy, "wchar_t");
|
|
case ConversionSpecifier::pArg:
|
|
return ArgType::CPointerTy;
|
|
case ConversionSpecifier::ObjCObjArg:
|
|
return ArgType::ObjCPointerTy;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// FIXME: Handle other cases.
|
|
return ArgType();
|
|
}
|
|
|
|
bool PrintfSpecifier::fixType(QualType QT, const LangOptions &LangOpt,
|
|
ASTContext &Ctx, bool IsObjCLiteral) {
|
|
// %n is different from other conversion specifiers; don't try to fix it.
|
|
if (CS.getKind() == ConversionSpecifier::nArg)
|
|
return false;
|
|
|
|
// Handle Objective-C objects first. Note that while the '%@' specifier will
|
|
// not warn for structure pointer or void pointer arguments (because that's
|
|
// how CoreFoundation objects are implemented), we only show a fixit for '%@'
|
|
// if we know it's an object (block, id, class, or __attribute__((NSObject))).
|
|
if (QT->isObjCRetainableType()) {
|
|
if (!IsObjCLiteral)
|
|
return false;
|
|
|
|
CS.setKind(ConversionSpecifier::ObjCObjArg);
|
|
|
|
// Disable irrelevant flags
|
|
HasThousandsGrouping = false;
|
|
HasPlusPrefix = false;
|
|
HasSpacePrefix = false;
|
|
HasAlternativeForm = false;
|
|
HasLeadingZeroes = false;
|
|
Precision.setHowSpecified(OptionalAmount::NotSpecified);
|
|
LM.setKind(LengthModifier::None);
|
|
|
|
return true;
|
|
}
|
|
|
|
// Handle strings next (char *, wchar_t *)
|
|
if (QT->isPointerType() && (QT->getPointeeType()->isAnyCharacterType())) {
|
|
CS.setKind(ConversionSpecifier::sArg);
|
|
|
|
// Disable irrelevant flags
|
|
HasAlternativeForm = 0;
|
|
HasLeadingZeroes = 0;
|
|
|
|
// Set the long length modifier for wide characters
|
|
if (QT->getPointeeType()->isWideCharType())
|
|
LM.setKind(LengthModifier::AsWideChar);
|
|
else
|
|
LM.setKind(LengthModifier::None);
|
|
|
|
return true;
|
|
}
|
|
|
|
// If it's an enum, get its underlying type.
|
|
if (const EnumType *ETy = QT->getAs<EnumType>())
|
|
QT = ETy->getDecl()->getIntegerType();
|
|
|
|
// We can only work with builtin types.
|
|
const BuiltinType *BT = QT->getAs<BuiltinType>();
|
|
if (!BT)
|
|
return false;
|
|
|
|
// Set length modifier
|
|
switch (BT->getKind()) {
|
|
case BuiltinType::Bool:
|
|
case BuiltinType::WChar_U:
|
|
case BuiltinType::WChar_S:
|
|
case BuiltinType::Char16:
|
|
case BuiltinType::Char32:
|
|
case BuiltinType::UInt128:
|
|
case BuiltinType::Int128:
|
|
case BuiltinType::Half:
|
|
// Various types which are non-trivial to correct.
|
|
return false;
|
|
|
|
#define SIGNED_TYPE(Id, SingletonId)
|
|
#define UNSIGNED_TYPE(Id, SingletonId)
|
|
#define FLOATING_TYPE(Id, SingletonId)
|
|
#define BUILTIN_TYPE(Id, SingletonId) \
|
|
case BuiltinType::Id:
|
|
#include "clang/AST/BuiltinTypes.def"
|
|
// Misc other stuff which doesn't make sense here.
|
|
return false;
|
|
|
|
case BuiltinType::UInt:
|
|
case BuiltinType::Int:
|
|
case BuiltinType::Float:
|
|
case BuiltinType::Double:
|
|
LM.setKind(LengthModifier::None);
|
|
break;
|
|
|
|
case BuiltinType::Char_U:
|
|
case BuiltinType::UChar:
|
|
case BuiltinType::Char_S:
|
|
case BuiltinType::SChar:
|
|
LM.setKind(LengthModifier::AsChar);
|
|
break;
|
|
|
|
case BuiltinType::Short:
|
|
case BuiltinType::UShort:
|
|
LM.setKind(LengthModifier::AsShort);
|
|
break;
|
|
|
|
case BuiltinType::Long:
|
|
case BuiltinType::ULong:
|
|
LM.setKind(LengthModifier::AsLong);
|
|
break;
|
|
|
|
case BuiltinType::LongLong:
|
|
case BuiltinType::ULongLong:
|
|
LM.setKind(LengthModifier::AsLongLong);
|
|
break;
|
|
|
|
case BuiltinType::LongDouble:
|
|
LM.setKind(LengthModifier::AsLongDouble);
|
|
break;
|
|
}
|
|
|
|
// Handle size_t, ptrdiff_t, etc. that have dedicated length modifiers in C99.
|
|
if (isa<TypedefType>(QT) && (LangOpt.C99 || LangOpt.CPlusPlus11))
|
|
namedTypeToLengthModifier(QT, LM);
|
|
|
|
// If fixing the length modifier was enough, we might be done.
|
|
if (hasValidLengthModifier(Ctx.getTargetInfo())) {
|
|
// If we're going to offer a fix anyway, make sure the sign matches.
|
|
switch (CS.getKind()) {
|
|
case ConversionSpecifier::uArg:
|
|
case ConversionSpecifier::UArg:
|
|
if (QT->isSignedIntegerType())
|
|
CS.setKind(clang::analyze_format_string::ConversionSpecifier::dArg);
|
|
break;
|
|
case ConversionSpecifier::dArg:
|
|
case ConversionSpecifier::DArg:
|
|
case ConversionSpecifier::iArg:
|
|
if (QT->isUnsignedIntegerType() && !HasPlusPrefix)
|
|
CS.setKind(clang::analyze_format_string::ConversionSpecifier::uArg);
|
|
break;
|
|
default:
|
|
// Other specifiers do not have signed/unsigned variants.
|
|
break;
|
|
}
|
|
|
|
const analyze_printf::ArgType &ATR = getArgType(Ctx, IsObjCLiteral);
|
|
if (ATR.isValid() && ATR.matchesType(Ctx, QT))
|
|
return true;
|
|
}
|
|
|
|
// Set conversion specifier and disable any flags which do not apply to it.
|
|
// Let typedefs to char fall through to int, as %c is silly for uint8_t.
|
|
if (!isa<TypedefType>(QT) && QT->isCharType()) {
|
|
CS.setKind(ConversionSpecifier::cArg);
|
|
LM.setKind(LengthModifier::None);
|
|
Precision.setHowSpecified(OptionalAmount::NotSpecified);
|
|
HasAlternativeForm = 0;
|
|
HasLeadingZeroes = 0;
|
|
HasPlusPrefix = 0;
|
|
}
|
|
// Test for Floating type first as LongDouble can pass isUnsignedIntegerType
|
|
else if (QT->isRealFloatingType()) {
|
|
CS.setKind(ConversionSpecifier::fArg);
|
|
}
|
|
else if (QT->isSignedIntegerType()) {
|
|
CS.setKind(ConversionSpecifier::dArg);
|
|
HasAlternativeForm = 0;
|
|
}
|
|
else if (QT->isUnsignedIntegerType()) {
|
|
CS.setKind(ConversionSpecifier::uArg);
|
|
HasAlternativeForm = 0;
|
|
HasPlusPrefix = 0;
|
|
} else {
|
|
llvm_unreachable("Unexpected type");
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void PrintfSpecifier::toString(raw_ostream &os) const {
|
|
// Whilst some features have no defined order, we are using the order
|
|
// appearing in the C99 standard (ISO/IEC 9899:1999 (E) 7.19.6.1)
|
|
os << "%";
|
|
|
|
// Positional args
|
|
if (usesPositionalArg()) {
|
|
os << getPositionalArgIndex() << "$";
|
|
}
|
|
|
|
// Conversion flags
|
|
if (IsLeftJustified) os << "-";
|
|
if (HasPlusPrefix) os << "+";
|
|
if (HasSpacePrefix) os << " ";
|
|
if (HasAlternativeForm) os << "#";
|
|
if (HasLeadingZeroes) os << "0";
|
|
|
|
// Minimum field width
|
|
FieldWidth.toString(os);
|
|
// Precision
|
|
Precision.toString(os);
|
|
// Length modifier
|
|
os << LM.toString();
|
|
// Conversion specifier
|
|
os << CS.toString();
|
|
}
|
|
|
|
bool PrintfSpecifier::hasValidPlusPrefix() const {
|
|
if (!HasPlusPrefix)
|
|
return true;
|
|
|
|
// The plus prefix only makes sense for signed conversions
|
|
switch (CS.getKind()) {
|
|
case ConversionSpecifier::dArg:
|
|
case ConversionSpecifier::DArg:
|
|
case ConversionSpecifier::iArg:
|
|
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::FreeBSDrArg:
|
|
case ConversionSpecifier::FreeBSDyArg:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool PrintfSpecifier::hasValidAlternativeForm() const {
|
|
if (!HasAlternativeForm)
|
|
return true;
|
|
|
|
// Alternate form flag only valid with the oxXaAeEfFgG conversions
|
|
switch (CS.getKind()) {
|
|
case ConversionSpecifier::oArg:
|
|
case ConversionSpecifier::OArg:
|
|
case ConversionSpecifier::xArg:
|
|
case ConversionSpecifier::XArg:
|
|
case ConversionSpecifier::aArg:
|
|
case ConversionSpecifier::AArg:
|
|
case ConversionSpecifier::eArg:
|
|
case ConversionSpecifier::EArg:
|
|
case ConversionSpecifier::fArg:
|
|
case ConversionSpecifier::FArg:
|
|
case ConversionSpecifier::gArg:
|
|
case ConversionSpecifier::GArg:
|
|
case ConversionSpecifier::FreeBSDrArg:
|
|
case ConversionSpecifier::FreeBSDyArg:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool PrintfSpecifier::hasValidLeadingZeros() const {
|
|
if (!HasLeadingZeroes)
|
|
return true;
|
|
|
|
// Leading zeroes flag only valid with the diouxXaAeEfFgG conversions
|
|
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::aArg:
|
|
case ConversionSpecifier::AArg:
|
|
case ConversionSpecifier::eArg:
|
|
case ConversionSpecifier::EArg:
|
|
case ConversionSpecifier::fArg:
|
|
case ConversionSpecifier::FArg:
|
|
case ConversionSpecifier::gArg:
|
|
case ConversionSpecifier::GArg:
|
|
case ConversionSpecifier::FreeBSDrArg:
|
|
case ConversionSpecifier::FreeBSDyArg:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool PrintfSpecifier::hasValidSpacePrefix() const {
|
|
if (!HasSpacePrefix)
|
|
return true;
|
|
|
|
// The space prefix only makes sense for signed conversions
|
|
switch (CS.getKind()) {
|
|
case ConversionSpecifier::dArg:
|
|
case ConversionSpecifier::DArg:
|
|
case ConversionSpecifier::iArg:
|
|
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::FreeBSDrArg:
|
|
case ConversionSpecifier::FreeBSDyArg:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool PrintfSpecifier::hasValidLeftJustified() const {
|
|
if (!IsLeftJustified)
|
|
return true;
|
|
|
|
// The left justified flag is valid for all conversions except n
|
|
switch (CS.getKind()) {
|
|
case ConversionSpecifier::nArg:
|
|
return false;
|
|
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
bool PrintfSpecifier::hasValidThousandsGroupingPrefix() const {
|
|
if (!HasThousandsGrouping)
|
|
return true;
|
|
|
|
switch (CS.getKind()) {
|
|
case ConversionSpecifier::dArg:
|
|
case ConversionSpecifier::DArg:
|
|
case ConversionSpecifier::iArg:
|
|
case ConversionSpecifier::uArg:
|
|
case ConversionSpecifier::UArg:
|
|
case ConversionSpecifier::fArg:
|
|
case ConversionSpecifier::FArg:
|
|
case ConversionSpecifier::gArg:
|
|
case ConversionSpecifier::GArg:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool PrintfSpecifier::hasValidPrecision() const {
|
|
if (Precision.getHowSpecified() == OptionalAmount::NotSpecified)
|
|
return true;
|
|
|
|
// Precision is only valid with the diouxXaAeEfFgGs conversions
|
|
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::aArg:
|
|
case ConversionSpecifier::AArg:
|
|
case ConversionSpecifier::eArg:
|
|
case ConversionSpecifier::EArg:
|
|
case ConversionSpecifier::fArg:
|
|
case ConversionSpecifier::FArg:
|
|
case ConversionSpecifier::gArg:
|
|
case ConversionSpecifier::GArg:
|
|
case ConversionSpecifier::sArg:
|
|
case ConversionSpecifier::FreeBSDrArg:
|
|
case ConversionSpecifier::FreeBSDyArg:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
bool PrintfSpecifier::hasValidFieldWidth() const {
|
|
if (FieldWidth.getHowSpecified() == OptionalAmount::NotSpecified)
|
|
return true;
|
|
|
|
// The field width is valid for all conversions except n
|
|
switch (CS.getKind()) {
|
|
case ConversionSpecifier::nArg:
|
|
return false;
|
|
|
|
default:
|
|
return true;
|
|
}
|
|
}
|