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//===--- SemaInternal.h - Internal Sema Interfaces --------------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file provides common API and #includes for the internal
// implementation of Sema.
#include "clang/AST/ASTContext.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Sema.h"
#include "clang/Sema/SemaDiagnostic.h"
namespace clang {
inline PartialDiagnostic Sema::PDiag(unsigned DiagID) {
return PartialDiagnostic(DiagID, Context.getDiagAllocator());
inline bool
FTIHasSingleVoidParameter(const DeclaratorChunk::FunctionTypeInfo &FTI) {
return FTI.NumParams == 1 && !FTI.isVariadic &&
FTI.Params[0].Ident == nullptr && FTI.Params[0].Param &&
inline bool
FTIHasNonVoidParameters(const DeclaratorChunk::FunctionTypeInfo &FTI) {
// Assume FTI is well-formed.
return FTI.NumParams && !FTIHasSingleVoidParameter(FTI);
// This requires the variable to be non-dependent and the initializer
// to not be value dependent.
inline bool IsVariableAConstantExpression(VarDecl *Var, ASTContext &Context) {
const VarDecl *DefVD = nullptr;
return !isa<ParmVarDecl>(Var) &&
Var->isUsableInConstantExpressions(Context) &&
Var->getAnyInitializer(DefVD) && DefVD->checkInitIsICE();
// Helper function to check whether D's attributes match current CUDA mode.
// Decls with mismatched attributes and related diagnostics may have to be
// ignored during this CUDA compilation pass.
inline bool DeclAttrsMatchCUDAMode(const LangOptions &LangOpts, Decl *D) {
if (!LangOpts.CUDA || !D)
return true;
bool isDeviceSideDecl = D->hasAttr<CUDADeviceAttr>() ||
D->hasAttr<CUDASharedAttr>() ||
return isDeviceSideDecl == LangOpts.CUDAIsDevice;
// Directly mark a variable odr-used. Given a choice, prefer to use
// MarkVariableReferenced since it does additional checks and then
// calls MarkVarDeclODRUsed.
// If the variable must be captured:
// - if FunctionScopeIndexToStopAt is null, capture it in the CurContext
// - else capture it in the DeclContext that maps to the
// *FunctionScopeIndexToStopAt on the FunctionScopeInfo stack.
inline void MarkVarDeclODRUsed(VarDecl *Var,
SourceLocation Loc, Sema &SemaRef,
const unsigned *const FunctionScopeIndexToStopAt) {
// Keep track of used but undefined variables.
// FIXME: We shouldn't suppress this warning for static data members.
if (Var->hasDefinition(SemaRef.Context) == VarDecl::DeclarationOnly &&
(!Var->isExternallyVisible() || Var->isInline() ||
SemaRef.isExternalWithNoLinkageType(Var)) &&
!(Var->isStaticDataMember() && Var->hasInit())) {
SourceLocation &old = SemaRef.UndefinedButUsed[Var->getCanonicalDecl()];
if (old.isInvalid())
old = Loc;
QualType CaptureType, DeclRefType;
SemaRef.tryCaptureVariable(Var, Loc, Sema::TryCapture_Implicit,
/*EllipsisLoc*/ SourceLocation(),
/*BuildAndDiagnose*/ true,
CaptureType, DeclRefType,
/// Return a DLL attribute from the declaration.
inline InheritableAttr *getDLLAttr(Decl *D) {
assert(!(D->hasAttr<DLLImportAttr>() && D->hasAttr<DLLExportAttr>()) &&
"A declaration cannot be both dllimport and dllexport.");
if (auto *Import = D->getAttr<DLLImportAttr>())
return Import;
if (auto *Export = D->getAttr<DLLExportAttr>())
return Export;
return nullptr;
class TypoCorrectionConsumer : public VisibleDeclConsumer {
typedef SmallVector<TypoCorrection, 1> TypoResultList;
typedef llvm::StringMap<TypoResultList> TypoResultsMap;
typedef std::map<unsigned, TypoResultsMap> TypoEditDistanceMap;
TypoCorrectionConsumer(Sema &SemaRef,
const DeclarationNameInfo &TypoName,
Sema::LookupNameKind LookupKind,
Scope *S, CXXScopeSpec *SS,
std::unique_ptr<CorrectionCandidateCallback> CCC,
DeclContext *MemberContext,
bool EnteringContext)
: Typo(TypoName.getName().getAsIdentifierInfo()), CurrentTCIndex(0),
SavedTCIndex(0), SemaRef(SemaRef), S(S),
SS(SS ? llvm::make_unique<CXXScopeSpec>(*SS) : nullptr),
CorrectionValidator(std::move(CCC)), MemberContext(MemberContext),
Result(SemaRef, TypoName, LookupKind),
Namespaces(SemaRef.Context, SemaRef.CurContext, SS),
EnteringContext(EnteringContext), SearchNamespaces(false) {
// Arrange for ValidatedCorrections[0] to always be an empty correction.
bool includeHiddenDecls() const override { return true; }
// Methods for adding potential corrections to the consumer.
void FoundDecl(NamedDecl *ND, NamedDecl *Hiding, DeclContext *Ctx,
bool InBaseClass) override;
void FoundName(StringRef Name);
void addKeywordResult(StringRef Keyword);
void addCorrection(TypoCorrection Correction);
bool empty() const {
return CorrectionResults.empty() && ValidatedCorrections.size() == 1;
/// \brief Return the list of TypoCorrections for the given identifier from
/// the set of corrections that have the closest edit distance, if any.
TypoResultList &operator[](StringRef Name) {
return CorrectionResults.begin()->second[Name];
/// \brief Return the edit distance of the corrections that have the
/// closest/best edit distance from the original typop.
unsigned getBestEditDistance(bool Normalized) {
if (CorrectionResults.empty())
return (std::numeric_limits<unsigned>::max)();
unsigned BestED = CorrectionResults.begin()->first;
return Normalized ? TypoCorrection::NormalizeEditDistance(BestED) : BestED;
/// \brief Set-up method to add to the consumer the set of namespaces to use
/// in performing corrections to nested name specifiers. This method also
/// implicitly adds all of the known classes in the current AST context to the
/// to the consumer for correcting nested name specifiers.
addNamespaces(const llvm::MapVector<NamespaceDecl *, bool> &KnownNamespaces);
/// \brief Return the next typo correction that passes all internal filters
/// and is deemed valid by the consumer's CorrectionCandidateCallback,
/// starting with the corrections that have the closest edit distance. An
/// empty TypoCorrection is returned once no more viable corrections remain
/// in the consumer.
const TypoCorrection &getNextCorrection();
/// \brief Get the last correction returned by getNextCorrection().
const TypoCorrection &getCurrentCorrection() {
return CurrentTCIndex < ValidatedCorrections.size()
? ValidatedCorrections[CurrentTCIndex]
: ValidatedCorrections[0]; // The empty correction.
/// \brief Return the next typo correction like getNextCorrection, but keep
/// the internal state pointed to the current correction (i.e. the next time
/// getNextCorrection is called, it will return the same correction returned
/// by peekNextcorrection).
const TypoCorrection &peekNextCorrection() {
auto Current = CurrentTCIndex;
const TypoCorrection &TC = getNextCorrection();
CurrentTCIndex = Current;
return TC;
/// \brief Reset the consumer's position in the stream of viable corrections
/// (i.e. getNextCorrection() will return each of the previously returned
/// corrections in order before returning any new corrections).
void resetCorrectionStream() {
CurrentTCIndex = 0;
/// \brief Return whether the end of the stream of corrections has been
/// reached.
bool finished() {
return CorrectionResults.empty() &&
CurrentTCIndex >= ValidatedCorrections.size();
/// \brief Save the current position in the correction stream (overwriting any
/// previously saved position).
void saveCurrentPosition() {
SavedTCIndex = CurrentTCIndex;
/// \brief Restore the saved position in the correction stream.
void restoreSavedPosition() {
CurrentTCIndex = SavedTCIndex;
ASTContext &getContext() const { return SemaRef.Context; }
const LookupResult &getLookupResult() const { return Result; }
bool isAddressOfOperand() const { return CorrectionValidator->IsAddressOfOperand; }
const CXXScopeSpec *getSS() const { return SS.get(); }
Scope *getScope() const { return S; }
CorrectionCandidateCallback *getCorrectionValidator() const {
return CorrectionValidator.get();
class NamespaceSpecifierSet {
struct SpecifierInfo {
DeclContext* DeclCtx;
NestedNameSpecifier* NameSpecifier;
unsigned EditDistance;
typedef SmallVector<DeclContext*, 4> DeclContextList;
typedef SmallVector<SpecifierInfo, 16> SpecifierInfoList;
ASTContext &Context;
DeclContextList CurContextChain;
std::string CurNameSpecifier;
SmallVector<const IdentifierInfo*, 4> CurContextIdentifiers;
SmallVector<const IdentifierInfo*, 4> CurNameSpecifierIdentifiers;
std::map<unsigned, SpecifierInfoList> DistanceMap;
/// \brief Helper for building the list of DeclContexts between the current
/// context and the top of the translation unit
static DeclContextList buildContextChain(DeclContext *Start);
unsigned buildNestedNameSpecifier(DeclContextList &DeclChain,
NestedNameSpecifier *&NNS);
NamespaceSpecifierSet(ASTContext &Context, DeclContext *CurContext,
CXXScopeSpec *CurScopeSpec);
/// \brief Add the DeclContext (a namespace or record) to the set, computing
/// the corresponding NestedNameSpecifier and its distance in the process.
void addNameSpecifier(DeclContext *Ctx);
/// \brief Provides flat iteration over specifiers, sorted by distance.
class iterator
: public llvm::iterator_facade_base<iterator, std::forward_iterator_tag,
SpecifierInfo> {
/// Always points to the last element in the distance map.
const std::map<unsigned, SpecifierInfoList>::iterator OuterBack;
/// Iterator on the distance map.
std::map<unsigned, SpecifierInfoList>::iterator Outer;
/// Iterator on an element in the distance map.
SpecifierInfoList::iterator Inner;
iterator(NamespaceSpecifierSet &Set, bool IsAtEnd)
: OuterBack(std::prev(Set.DistanceMap.end())),
Inner(!IsAtEnd ? Outer->second.begin() : OuterBack->second.end()) {
iterator &operator++() {
if (Inner == Outer->second.end() && Outer != OuterBack) {
Inner = Outer->second.begin();
return *this;
SpecifierInfo &operator*() { return *Inner; }
bool operator==(const iterator &RHS) const { return Inner == RHS.Inner; }
iterator begin() { return iterator(*this, /*IsAtEnd=*/false); }
iterator end() { return iterator(*this, /*IsAtEnd=*/true); }
void addName(StringRef Name, NamedDecl *ND,
NestedNameSpecifier *NNS = nullptr, bool isKeyword = false);
/// \brief Find any visible decls for the given typo correction candidate.
/// If none are found, it to the set of candidates for which qualified lookups
/// will be performed to find possible nested name specifier changes.
bool resolveCorrection(TypoCorrection &Candidate);
/// \brief Perform qualified lookups on the queued set of typo correction
/// candidates and add the nested name specifier changes to each candidate if
/// a lookup succeeds (at which point the candidate will be returned to the
/// main pool of potential corrections).
void performQualifiedLookups();
/// \brief The name written that is a typo in the source.
IdentifierInfo *Typo;
/// \brief The results found that have the smallest edit distance
/// found (so far) with the typo name.
/// The pointer value being set to the current DeclContext indicates
/// whether there is a keyword with this name.
TypoEditDistanceMap CorrectionResults;
SmallVector<TypoCorrection, 4> ValidatedCorrections;
size_t CurrentTCIndex;
size_t SavedTCIndex;
Sema &SemaRef;
Scope *S;
std::unique_ptr<CXXScopeSpec> SS;
std::unique_ptr<CorrectionCandidateCallback> CorrectionValidator;
DeclContext *MemberContext;
LookupResult Result;
NamespaceSpecifierSet Namespaces;
SmallVector<TypoCorrection, 2> QualifiedResults;
bool EnteringContext;
bool SearchNamespaces;
inline Sema::TypoExprState::TypoExprState() {}
inline Sema::TypoExprState::TypoExprState(TypoExprState &&other) noexcept {
*this = std::move(other);
inline Sema::TypoExprState &Sema::TypoExprState::
operator=(Sema::TypoExprState &&other) noexcept {
Consumer = std::move(other.Consumer);
DiagHandler = std::move(other.DiagHandler);
RecoveryHandler = std::move(other.RecoveryHandler);
return *this;
} // end namespace clang