YQ Connector: support managed ClickHouse

Со стороны dqrun можно обратиться к инстансу коннектора, который работает на streaming стенде, и извлечь данные из облачного CH.

1 files changed, 796 insertions, 0 deletions

diff --git a/contrib/libs/clang16/include/clang/AST/FormatString.h b/contrib/libs/clang16/include/clang/AST/FormatString.h
new file mode 100644
index 0000000000..cffa943af6
--- /dev/null
+++ b/contrib/libs/clang16/include/clang/AST/FormatString.h
@@ -0,0 +1,796 @@
+#pragma once
+
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+//= FormatString.h - Analysis of printf/fprintf format strings --*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines APIs for analyzing the format strings of printf, fscanf,
+// and friends.
+//
+// The structure of format strings for fprintf are described in C99 7.19.6.1.
+//
+// The structure of format strings for fscanf are described in C99 7.19.6.2.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_FORMATSTRING_H
+#define LLVM_CLANG_AST_FORMATSTRING_H
+
+#include "clang/AST/CanonicalType.h"
+#include <optional>
+
+namespace clang {
+
+class TargetInfo;
+
+//===----------------------------------------------------------------------===//
+/// Common components of both fprintf and fscanf format strings.
+namespace analyze_format_string {
+
+/// Class representing optional flags with location and representation
+/// information.
+class OptionalFlag {
+public:
+  OptionalFlag(const char *Representation)
+      : representation(Representation), flag(false) {}
+  bool isSet() const { return flag; }
+  void set() { flag = true; }
+  void clear() { flag = false; }
+  void setPosition(const char *position) {
+    assert(position);
+    flag = true;
+    this->position = position;
+  }
+  const char *getPosition() const {
+    assert(position);
+    return position;
+  }
+  const char *toString() const { return representation; }
+
+  // Overloaded operators for bool like qualities
+  explicit operator bool() const { return flag; }
+  OptionalFlag& operator=(const bool &rhs) {
+    flag = rhs;
+    return *this;  // Return a reference to myself.
+  }
+private:
+  const char *representation;
+  const char *position;
+  bool flag;
+};
+
+/// Represents the length modifier in a format string in scanf/printf.
+class LengthModifier {
+public:
+  enum Kind {
+    None,
+    AsChar,       // 'hh'
+    AsShort,      // 'h'
+    AsShortLong,  // 'hl' (OpenCL float/int vector element)
+    AsLong,       // 'l'
+    AsLongLong,   // 'll'
+    AsQuad,       // 'q' (BSD, deprecated, for 64-bit integer types)
+    AsIntMax,     // 'j'
+    AsSizeT,      // 'z'
+    AsPtrDiff,    // 't'
+    AsInt32,      // 'I32' (MSVCRT, like __int32)
+    AsInt3264,    // 'I'   (MSVCRT, like __int3264 from MIDL)
+    AsInt64,      // 'I64' (MSVCRT, like __int64)
+    AsLongDouble, // 'L'
+    AsAllocate,   // for '%as', GNU extension to C90 scanf
+    AsMAllocate,  // for '%ms', GNU extension to scanf
+    AsWide,       // 'w' (MSVCRT, like l but only for c, C, s, S, or Z
+    AsWideChar = AsLong // for '%ls', only makes sense for printf
+  };
+
+  LengthModifier()
+    : Position(nullptr), kind(None) {}
+  LengthModifier(const char *pos, Kind k)
+    : Position(pos), kind(k) {}
+
+  const char *getStart() const {
+    return Position;
+  }
+
+  unsigned getLength() const {
+    switch (kind) {
+      default:
+        return 1;
+      case AsLongLong:
+      case AsChar:
+        return 2;
+      case AsInt32:
+      case AsInt64:
+        return 3;
+      case None:
+        return 0;
+    }
+  }
+
+  Kind getKind() const { return kind; }
+  void setKind(Kind k) { kind = k; }
+
+  const char *toString() const;
+
+private:
+  const char *Position;
+  Kind kind;
+};
+
+class ConversionSpecifier {
+public:
+  enum Kind {
+    InvalidSpecifier = 0,
+    // C99 conversion specifiers.
+    cArg,
+    dArg,
+    DArg, // Apple extension
+    iArg,
+    // C23 conversion specifiers.
+    bArg,
+    BArg,
+
+    IntArgBeg = dArg,
+    IntArgEnd = BArg,
+
+    oArg,
+    OArg, // Apple extension
+    uArg,
+    UArg, // Apple extension
+    xArg,
+    XArg,
+    UIntArgBeg = oArg,
+    UIntArgEnd = XArg,
+
+    fArg,
+    FArg,
+    eArg,
+    EArg,
+    gArg,
+    GArg,
+    aArg,
+    AArg,
+    DoubleArgBeg = fArg,
+    DoubleArgEnd = AArg,
+
+    sArg,
+    pArg,
+    nArg,
+    PercentArg,
+    CArg,
+    SArg,
+
+    // Apple extension: P specifies to os_log that the data being pointed to is
+    // to be copied by os_log. The precision indicates the number of bytes to
+    // copy.
+    PArg,
+
+    // ** Printf-specific **
+
+    ZArg, // MS extension
+
+    // Objective-C specific specifiers.
+    ObjCObjArg, // '@'
+    ObjCBeg = ObjCObjArg,
+    ObjCEnd = ObjCObjArg,
+
+    // FreeBSD kernel specific specifiers.
+    FreeBSDbArg,
+    FreeBSDDArg,
+    FreeBSDrArg,
+    FreeBSDyArg,
+
+    // GlibC specific specifiers.
+    PrintErrno, // 'm'
+
+    PrintfConvBeg = ObjCObjArg,
+    PrintfConvEnd = PrintErrno,
+
+    // ** Scanf-specific **
+    ScanListArg, // '['
+    ScanfConvBeg = ScanListArg,
+    ScanfConvEnd = ScanListArg
+  };
+
+  ConversionSpecifier(bool isPrintf = true)
+    : IsPrintf(isPrintf), Position(nullptr), EndScanList(nullptr),
+      kind(InvalidSpecifier) {}
+
+  ConversionSpecifier(bool isPrintf, const char *pos, Kind k)
+    : IsPrintf(isPrintf), Position(pos), EndScanList(nullptr), kind(k) {}
+
+  const char *getStart() const {
+    return Position;
+  }
+
+  StringRef getCharacters() const {
+    return StringRef(getStart(), getLength());
+  }
+
+  bool consumesDataArgument() const {
+    switch (kind) {
+      case PrintErrno:
+        assert(IsPrintf);
+        return false;
+      case PercentArg:
+        return false;
+      case InvalidSpecifier:
+        return false;
+      default:
+        return true;
+    }
+  }
+
+  Kind getKind() const { return kind; }
+  void setKind(Kind k) { kind = k; }
+  unsigned getLength() const {
+    return EndScanList ? EndScanList - Position : 1;
+  }
+  void setEndScanList(const char *pos) { EndScanList = pos; }
+
+  bool isIntArg() const { return (kind >= IntArgBeg && kind <= IntArgEnd) ||
+    kind == FreeBSDrArg || kind == FreeBSDyArg; }
+  bool isUIntArg() const { return kind >= UIntArgBeg && kind <= UIntArgEnd; }
+  bool isAnyIntArg() const { return kind >= IntArgBeg && kind <= UIntArgEnd; }
+  bool isDoubleArg() const {
+    return kind >= DoubleArgBeg && kind <= DoubleArgEnd;
+  }
+
+  const char *toString() const;
+
+  bool isPrintfKind() const { return IsPrintf; }
+
+  std::optional<ConversionSpecifier> getStandardSpecifier() const;
+
+protected:
+  bool IsPrintf;
+  const char *Position;
+  const char *EndScanList;
+  Kind kind;
+};
+
+class ArgType {
+public:
+  enum Kind { UnknownTy, InvalidTy, SpecificTy, ObjCPointerTy, CPointerTy,
+              AnyCharTy, CStrTy, WCStrTy, WIntTy };
+
+  /// How well a given conversion specifier matches its argument.
+  enum MatchKind {
+    /// The conversion specifier and the argument types are incompatible. For
+    /// instance, "%d" and float.
+    NoMatch = 0,
+    /// The conversion specifier and the argument type are compatible. For
+    /// instance, "%d" and int.
+    Match = 1,
+    /// The conversion specifier and the argument type are compatible because of
+    /// default argument promotions. For instance, "%hhd" and int.
+    MatchPromotion,
+    /// The conversion specifier and the argument type are compatible but still
+    /// seems likely to be an error. For instanace, "%hhd" and short.
+    NoMatchPromotionTypeConfusion,
+    /// The conversion specifier and the argument type are disallowed by the C
+    /// standard, but are in practice harmless. For instance, "%p" and int*.
+    NoMatchPedantic,
+    /// The conversion specifier and the argument type are compatible, but still
+    /// seems likely to be an error. For instance, "%hd" and _Bool.
+    NoMatchTypeConfusion,
+  };
+
+private:
+  const Kind K;
+  QualType T;
+  const char *Name = nullptr;
+  bool Ptr = false;
+
+  /// The TypeKind identifies certain well-known types like size_t and
+  /// ptrdiff_t.
+  enum class TypeKind { DontCare, SizeT, PtrdiffT };
+  TypeKind TK = TypeKind::DontCare;
+
+public:
+  ArgType(Kind K = UnknownTy, const char *N = nullptr) : K(K), Name(N) {}
+  ArgType(QualType T, const char *N = nullptr) : K(SpecificTy), T(T), Name(N) {}
+  ArgType(CanQualType T) : K(SpecificTy), T(T) {}
+
+  static ArgType Invalid() { return ArgType(InvalidTy); }
+  bool isValid() const { return K != InvalidTy; }
+
+  bool isSizeT() const { return TK == TypeKind::SizeT; }
+
+  bool isPtrdiffT() const { return TK == TypeKind::PtrdiffT; }
+
+  /// Create an ArgType which corresponds to the type pointer to A.
+  static ArgType PtrTo(const ArgType& A) {
+    assert(A.K >= InvalidTy && "ArgType cannot be pointer to invalid/unknown");
+    ArgType Res = A;
+    Res.Ptr = true;
+    return Res;
+  }
+
+  /// Create an ArgType which corresponds to the size_t/ssize_t type.
+  static ArgType makeSizeT(const ArgType &A) {
+    ArgType Res = A;
+    Res.TK = TypeKind::SizeT;
+    return Res;
+  }
+
+  /// Create an ArgType which corresponds to the ptrdiff_t/unsigned ptrdiff_t
+  /// type.
+  static ArgType makePtrdiffT(const ArgType &A) {
+    ArgType Res = A;
+    Res.TK = TypeKind::PtrdiffT;
+    return Res;
+  }
+
+  MatchKind matchesType(ASTContext &C, QualType argTy) const;
+
+  QualType getRepresentativeType(ASTContext &C) const;
+
+  ArgType makeVectorType(ASTContext &C, unsigned NumElts) const;
+
+  std::string getRepresentativeTypeName(ASTContext &C) const;
+};
+
+class OptionalAmount {
+public:
+  enum HowSpecified { NotSpecified, Constant, Arg, Invalid };
+
+  OptionalAmount(HowSpecified howSpecified,
+                 unsigned amount,
+                 const char *amountStart,
+                 unsigned amountLength,
+                 bool usesPositionalArg)
+  : start(amountStart), length(amountLength), hs(howSpecified), amt(amount),
+  UsesPositionalArg(usesPositionalArg), UsesDotPrefix(false) {}
+
+  OptionalAmount(bool valid = true)
+  : start(nullptr),length(0), hs(valid ? NotSpecified : Invalid), amt(0),
+  UsesPositionalArg(false), UsesDotPrefix(false) {}
+
+  explicit OptionalAmount(unsigned Amount)
+    : start(nullptr), length(0), hs(Constant), amt(Amount),
+    UsesPositionalArg(false), UsesDotPrefix(false) {}
+
+  bool isInvalid() const {
+    return hs == Invalid;
+  }
+
+  HowSpecified getHowSpecified() const { return hs; }
+  void setHowSpecified(HowSpecified h) { hs = h; }
+
+  bool hasDataArgument() const { return hs == Arg; }
+
+  unsigned getArgIndex() const {
+    assert(hasDataArgument());
+    return amt;
+  }
+
+  unsigned getConstantAmount() const {
+    assert(hs == Constant);
+    return amt;
+  }
+
+  const char *getStart() const {
+      // We include the . character if it is given.
+    return start - UsesDotPrefix;
+  }
+
+  unsigned getConstantLength() const {
+    assert(hs == Constant);
+    return length + UsesDotPrefix;
+  }
+
+  ArgType getArgType(ASTContext &Ctx) const;
+
+  void toString(raw_ostream &os) const;
+
+  bool usesPositionalArg() const { return (bool) UsesPositionalArg; }
+  unsigned getPositionalArgIndex() const {
+    assert(hasDataArgument());
+    return amt + 1;
+  }
+
+  bool usesDotPrefix() const { return UsesDotPrefix; }
+  void setUsesDotPrefix() { UsesDotPrefix = true; }
+
+private:
+  const char *start;
+  unsigned length;
+  HowSpecified hs;
+  unsigned amt;
+  bool UsesPositionalArg : 1;
+  bool UsesDotPrefix;
+};
+
+
+class FormatSpecifier {
+protected:
+  LengthModifier LM;
+  OptionalAmount FieldWidth;
+  ConversionSpecifier CS;
+  OptionalAmount VectorNumElts;
+
+  /// Positional arguments, an IEEE extension:
+  ///  IEEE Std 1003.1, 2004 Edition
+  ///  http://www.opengroup.org/onlinepubs/009695399/functions/printf.html
+  bool UsesPositionalArg;
+  unsigned argIndex;
+public:
+  FormatSpecifier(bool isPrintf)
+    : CS(isPrintf), VectorNumElts(false),
+      UsesPositionalArg(false), argIndex(0) {}
+
+  void setLengthModifier(LengthModifier lm) {
+    LM = lm;
+  }
+
+  void setUsesPositionalArg() { UsesPositionalArg = true; }
+
+  void setArgIndex(unsigned i) {
+    argIndex = i;
+  }
+
+  unsigned getArgIndex() const {
+    return argIndex;
+  }
+
+  unsigned getPositionalArgIndex() const {
+    return argIndex + 1;
+  }
+
+  const LengthModifier &getLengthModifier() const {
+    return LM;
+  }
+
+  const OptionalAmount &getFieldWidth() const {
+    return FieldWidth;
+  }
+
+  void setVectorNumElts(const OptionalAmount &Amt) {
+    VectorNumElts = Amt;
+  }
+
+  const OptionalAmount &getVectorNumElts() const {
+    return VectorNumElts;
+  }
+
+  void setFieldWidth(const OptionalAmount &Amt) {
+    FieldWidth = Amt;
+  }
+
+  bool usesPositionalArg() const { return UsesPositionalArg; }
+
+  bool hasValidLengthModifier(const TargetInfo &Target,
+                              const LangOptions &LO) const;
+
+  bool hasStandardLengthModifier() const;
+
+  std::optional<LengthModifier> getCorrectedLengthModifier() const;
+
+  bool hasStandardConversionSpecifier(const LangOptions &LangOpt) const;
+
+  bool hasStandardLengthConversionCombination() const;
+
+  /// For a TypedefType QT, if it is a named integer type such as size_t,
+  /// assign the appropriate value to LM and return true.
+  static bool namedTypeToLengthModifier(QualType QT, LengthModifier &LM);
+};
+
+} // end analyze_format_string namespace
+
+//===----------------------------------------------------------------------===//
+/// Pieces specific to fprintf format strings.
+
+namespace analyze_printf {
+
+class PrintfConversionSpecifier :
+  public analyze_format_string::ConversionSpecifier  {
+public:
+  PrintfConversionSpecifier()
+    : ConversionSpecifier(true, nullptr, InvalidSpecifier) {}
+
+  PrintfConversionSpecifier(const char *pos, Kind k)
+    : ConversionSpecifier(true, pos, k) {}
+
+  bool isObjCArg() const { return kind >= ObjCBeg && kind <= ObjCEnd; }
+  bool isDoubleArg() const { return kind >= DoubleArgBeg &&
+                                    kind <= DoubleArgEnd; }
+
+  static bool classof(const analyze_format_string::ConversionSpecifier *CS) {
+    return CS->isPrintfKind();
+  }
+};
+
+using analyze_format_string::ArgType;
+using analyze_format_string::LengthModifier;
+using analyze_format_string::OptionalAmount;
+using analyze_format_string::OptionalFlag;
+
+class PrintfSpecifier : public analyze_format_string::FormatSpecifier {
+  OptionalFlag HasThousandsGrouping; // ''', POSIX extension.
+  OptionalFlag IsLeftJustified; // '-'
+  OptionalFlag HasPlusPrefix; // '+'
+  OptionalFlag HasSpacePrefix; // ' '
+  OptionalFlag HasAlternativeForm; // '#'
+  OptionalFlag HasLeadingZeroes; // '0'
+  OptionalFlag HasObjCTechnicalTerm; // '[tt]'
+  OptionalFlag IsPrivate;            // '{private}'
+  OptionalFlag IsPublic;             // '{public}'
+  OptionalFlag IsSensitive;          // '{sensitive}'
+  OptionalAmount Precision;
+  StringRef MaskType;
+
+  ArgType getScalarArgType(ASTContext &Ctx, bool IsObjCLiteral) const;
+
+public:
+  PrintfSpecifier()
+      : FormatSpecifier(/* isPrintf = */ true), HasThousandsGrouping("'"),
+        IsLeftJustified("-"), HasPlusPrefix("+"), HasSpacePrefix(" "),
+        HasAlternativeForm("#"), HasLeadingZeroes("0"),
+        HasObjCTechnicalTerm("tt"), IsPrivate("private"), IsPublic("public"),
+        IsSensitive("sensitive") {}
+
+  static PrintfSpecifier Parse(const char *beg, const char *end);
+
+    // Methods for incrementally constructing the PrintfSpecifier.
+  void setConversionSpecifier(const PrintfConversionSpecifier &cs) {
+    CS = cs;
+  }
+  void setHasThousandsGrouping(const char *position) {
+    HasThousandsGrouping.setPosition(position);
+  }
+  void setIsLeftJustified(const char *position) {
+    IsLeftJustified.setPosition(position);
+  }
+  void setHasPlusPrefix(const char *position) {
+    HasPlusPrefix.setPosition(position);
+  }
+  void setHasSpacePrefix(const char *position) {
+    HasSpacePrefix.setPosition(position);
+  }
+  void setHasAlternativeForm(const char *position) {
+    HasAlternativeForm.setPosition(position);
+  }
+  void setHasLeadingZeros(const char *position) {
+    HasLeadingZeroes.setPosition(position);
+  }
+  void setHasObjCTechnicalTerm(const char *position) {
+    HasObjCTechnicalTerm.setPosition(position);
+  }
+  void setIsPrivate(const char *position) { IsPrivate.setPosition(position); }
+  void setIsPublic(const char *position) { IsPublic.setPosition(position); }
+  void setIsSensitive(const char *position) {
+    IsSensitive.setPosition(position);
+  }
+  void setUsesPositionalArg() { UsesPositionalArg = true; }
+
+    // Methods for querying the format specifier.
+
+  const PrintfConversionSpecifier &getConversionSpecifier() const {
+    return cast<PrintfConversionSpecifier>(CS);
+  }
+
+  void setPrecision(const OptionalAmount &Amt) {
+    Precision = Amt;
+    Precision.setUsesDotPrefix();
+  }
+
+  const OptionalAmount &getPrecision() const {
+    return Precision;
+  }
+
+  bool consumesDataArgument() const {
+    return getConversionSpecifier().consumesDataArgument();
+  }
+
+  /// Returns the builtin type that a data argument
+  /// paired with this format specifier should have.  This method
+  /// will return null if the format specifier does not have
+  /// a matching data argument or the matching argument matches
+  /// more than one type.
+  ArgType getArgType(ASTContext &Ctx, bool IsObjCLiteral) const;
+
+  const OptionalFlag &hasThousandsGrouping() const {
+      return HasThousandsGrouping;
+  }
+  const OptionalFlag &isLeftJustified() const { return IsLeftJustified; }
+  const OptionalFlag &hasPlusPrefix() const { return HasPlusPrefix; }
+  const OptionalFlag &hasAlternativeForm() const { return HasAlternativeForm; }
+  const OptionalFlag &hasLeadingZeros() const { return HasLeadingZeroes; }
+  const OptionalFlag &hasSpacePrefix() const { return HasSpacePrefix; }
+  const OptionalFlag &hasObjCTechnicalTerm() const { return HasObjCTechnicalTerm; }
+  const OptionalFlag &isPrivate() const { return IsPrivate; }
+  const OptionalFlag &isPublic() const { return IsPublic; }
+  const OptionalFlag &isSensitive() const { return IsSensitive; }
+  bool usesPositionalArg() const { return UsesPositionalArg; }
+
+  StringRef getMaskType() const { return MaskType; }
+  void setMaskType(StringRef S) { MaskType = S; }
+
+  /// Changes the specifier and length according to a QualType, retaining any
+  /// flags or options. Returns true on success, or false when a conversion
+  /// was not successful.
+  bool fixType(QualType QT, const LangOptions &LangOpt, ASTContext &Ctx,
+               bool IsObjCLiteral);
+
+  void toString(raw_ostream &os) const;
+
+  // Validation methods - to check if any element results in undefined behavior
+  bool hasValidPlusPrefix() const;
+  bool hasValidAlternativeForm() const;
+  bool hasValidLeadingZeros() const;
+  bool hasValidSpacePrefix() const;
+  bool hasValidLeftJustified() const;
+  bool hasValidThousandsGroupingPrefix() const;
+
+  bool hasValidPrecision() const;
+  bool hasValidFieldWidth() const;
+};
+}  // end analyze_printf namespace
+
+//===----------------------------------------------------------------------===//
+/// Pieces specific to fscanf format strings.
+
+namespace analyze_scanf {
+
+class ScanfConversionSpecifier :
+    public analyze_format_string::ConversionSpecifier  {
+public:
+  ScanfConversionSpecifier()
+    : ConversionSpecifier(false, nullptr, InvalidSpecifier) {}
+
+  ScanfConversionSpecifier(const char *pos, Kind k)
+    : ConversionSpecifier(false, pos, k) {}
+
+  static bool classof(const analyze_format_string::ConversionSpecifier *CS) {
+    return !CS->isPrintfKind();
+  }
+};
+
+using analyze_format_string::ArgType;
+using analyze_format_string::LengthModifier;
+using analyze_format_string::OptionalAmount;
+using analyze_format_string::OptionalFlag;
+
+class ScanfSpecifier : public analyze_format_string::FormatSpecifier {
+  OptionalFlag SuppressAssignment; // '*'
+public:
+  ScanfSpecifier() :
+    FormatSpecifier(/* isPrintf = */ false),
+    SuppressAssignment("*") {}
+
+  void setSuppressAssignment(const char *position) {
+    SuppressAssignment.setPosition(position);
+  }
+
+  const OptionalFlag &getSuppressAssignment() const {
+    return SuppressAssignment;
+  }
+
+  void setConversionSpecifier(const ScanfConversionSpecifier &cs) {
+    CS = cs;
+  }
+
+  const ScanfConversionSpecifier &getConversionSpecifier() const {
+    return cast<ScanfConversionSpecifier>(CS);
+  }
+
+  bool consumesDataArgument() const {
+    return CS.consumesDataArgument() && !SuppressAssignment;
+  }
+
+  ArgType getArgType(ASTContext &Ctx) const;
+
+  bool fixType(QualType QT, QualType RawQT, const LangOptions &LangOpt,
+               ASTContext &Ctx);
+
+  void toString(raw_ostream &os) const;
+
+  static ScanfSpecifier Parse(const char *beg, const char *end);
+};
+
+} // end analyze_scanf namespace
+
+//===----------------------------------------------------------------------===//
+// Parsing and processing of format strings (both fprintf and fscanf).
+
+namespace analyze_format_string {
+
+enum PositionContext { FieldWidthPos = 0, PrecisionPos = 1 };
+
+class FormatStringHandler {
+public:
+  FormatStringHandler() {}
+  virtual ~FormatStringHandler();
+
+  virtual void HandleNullChar(const char *nullCharacter) {}
+
+  virtual void HandlePosition(const char *startPos, unsigned posLen) {}
+
+  virtual void HandleInvalidPosition(const char *startPos, unsigned posLen,
+                                     PositionContext p) {}
+
+  virtual void HandleZeroPosition(const char *startPos, unsigned posLen) {}
+
+  virtual void HandleIncompleteSpecifier(const char *startSpecifier,
+                                         unsigned specifierLen) {}
+
+  virtual void HandleEmptyObjCModifierFlag(const char *startFlags,
+                                           unsigned flagsLen) {}
+
+  virtual void HandleInvalidObjCModifierFlag(const char *startFlag,
+                                             unsigned flagLen) {}
+
+  virtual void HandleObjCFlagsWithNonObjCConversion(const char *flagsStart,
+                                            const char *flagsEnd,
+                                            const char *conversionPosition) {}
+  // Printf-specific handlers.
+
+  virtual bool HandleInvalidPrintfConversionSpecifier(
+                                      const analyze_printf::PrintfSpecifier &FS,
+                                      const char *startSpecifier,
+                                      unsigned specifierLen) {
+    return true;
+  }
+
+  virtual bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
+                                     const char *startSpecifier,
+                                     unsigned specifierLen,
+                                     const TargetInfo &Target) {
+    return true;
+  }
+
+  /// Handle mask types whose sizes are not between one and eight bytes.
+  virtual void handleInvalidMaskType(StringRef MaskType) {}
+
+    // Scanf-specific handlers.
+
+  virtual bool HandleInvalidScanfConversionSpecifier(
+                                        const analyze_scanf::ScanfSpecifier &FS,
+                                        const char *startSpecifier,
+                                        unsigned specifierLen) {
+    return true;
+  }
+
+  virtual bool HandleScanfSpecifier(const analyze_scanf::ScanfSpecifier &FS,
+                                    const char *startSpecifier,
+                                    unsigned specifierLen) {
+    return true;
+  }
+
+  virtual void HandleIncompleteScanList(const char *start, const char *end) {}
+};
+
+bool ParsePrintfString(FormatStringHandler &H,
+                       const char *beg, const char *end, const LangOptions &LO,
+                       const TargetInfo &Target, bool isFreeBSDKPrintf);
+
+bool ParseFormatStringHasSArg(const char *beg, const char *end,
+                              const LangOptions &LO, const TargetInfo &Target);
+
+bool ParseScanfString(FormatStringHandler &H,
+                      const char *beg, const char *end, const LangOptions &LO,
+                      const TargetInfo &Target);
+
+/// Return true if the given string has at least one formatting specifier.
+bool parseFormatStringHasFormattingSpecifiers(const char *Begin,
+                                              const char *End,
+                                              const LangOptions &LO,
+                                              const TargetInfo &Target);
+
+} // end analyze_format_string namespace
+} // end clang namespace
+#endif
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif