Sema::SemaDiagnosticBuilder
Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
PD.Emit(Builder);
return Builder;
}
/// CheckEquivalentExceptionSpec - Check if the two types have equivalent
/// exception specifications. Exception specifications are equivalent if
/// they allow exactly the same set of exception types. It does not matter how
/// that is achieved. See C++ [except.spec]p2.
bool Sema::CheckEquivalentExceptionSpec(
const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
const FunctionProtoType *Old, SourceLocation OldLoc,
const FunctionProtoType *New, SourceLocation NewLoc,
bool *MissingEmptyExceptionSpecification) {
if (MissingEmptyExceptionSpecification)
*MissingEmptyExceptionSpecification = false;
bool OldAny = !Old->hasExceptionSpec() || Old->hasAnyExceptionSpec();
bool NewAny = !New->hasExceptionSpec() || New->hasAnyExceptionSpec();
if (OldAny && NewAny)
return false;
if (OldAny || NewAny) {
if (MissingEmptyExceptionSpecification && Old->hasExceptionSpec() &&
!Old->hasAnyExceptionSpec() && Old->getNumExceptions() == 0 &&
!New->hasExceptionSpec()) {
// The old type has a throw() exception specification and the
// new type has no exception specification, and the caller asked
// to handle this itself.
*MissingEmptyExceptionSpecification = true;
return true;
}
Diag(NewLoc, DiagID);
if (NoteID.getDiagID() != 0)
Diag(OldLoc, NoteID);
return true;
}
bool Success = true;
// Both have a definite exception spec. Collect the first set, then compare
// to the second.
llvm::SmallPtrSet<CanQualType, 8> OldTypes, NewTypes;
for (FunctionProtoType::exception_iterator I = Old->exception_begin(),
E = Old->exception_end(); I != E; ++I)
OldTypes.insert(Context.getCanonicalType(*I).getUnqualifiedType());
for (FunctionProtoType::exception_iterator I = New->exception_begin(),
E = New->exception_end(); I != E && Success; ++I) {
CanQualType TypePtr = Context.getCanonicalType(*I).getUnqualifiedType();
if(OldTypes.count(TypePtr))
NewTypes.insert(TypePtr);
else
Success = false;
}
Success = Success && OldTypes.size() == NewTypes.size();
if (Success) {
return false;
}
Diag(NewLoc, DiagID);
if (NoteID.getDiagID() != 0)
Diag(OldLoc, NoteID);
return true;
}
/// CheckExceptionSpecSubset - Check whether the second function type's
/// exception specification is a subset (or equivalent) of the first function
/// type. This is used by override and pointer assignment checks.
bool Sema::CheckExceptionSpecSubset(
const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
const FunctionProtoType *Superset, SourceLocation SuperLoc,
const FunctionProtoType *Subset, SourceLocation SubLoc) {
// FIXME: As usual, we could be more specific in our error messages, but
// that better waits until we've got types with source locations.
if (!SubLoc.isValid())
SubLoc = SuperLoc;
// If superset contains everything, we're done.
if (!Superset->hasExceptionSpec() || Superset->hasAnyExceptionSpec())
return CheckParamExceptionSpec(NoteID, Superset, SuperLoc, Subset, SubLoc);
// It does not. If the subset contains everything, we've failed.
if (!Subset->hasExceptionSpec() || Subset->hasAnyExceptionSpec()) {
Diag(SubLoc, DiagID);
if (NoteID.getDiagID() != 0)
Diag(SuperLoc, NoteID);
return true;
}
// Neither contains everything. Do a proper comparison.
for (FunctionProtoType::exception_iterator SubI = Subset->exception_begin(),
SubE = Subset->exception_end(); SubI != SubE; ++SubI) {
// Take one type from the subset.
QualType CanonicalSubT = Context.getCanonicalType(*SubI);
// Unwrap pointers and references so that we can do checks within a class
// hierarchy. Don't unwrap member pointers; they don't have hierarchy
// conversions on the pointee.
bool SubIsPointer = false;
if (const ReferenceType *RefTy = CanonicalSubT->getAs<ReferenceType>())
CanonicalSubT = RefTy->getPointeeType();
if (const PointerType *PtrTy = CanonicalSubT->getAs<PointerType>()) {
CanonicalSubT = PtrTy->getPointeeType();
SubIsPointer = true;
}
bool SubIsClass = CanonicalSubT->isRecordType();
CanonicalSubT = CanonicalSubT.getLocalUnqualifiedType();
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
/*DetectVirtual=*/false);
bool Contained = false;
// Make sure it's in the superset.
for (FunctionProtoType::exception_iterator SuperI =
Superset->exception_begin(), SuperE = Superset->exception_end();
SuperI != SuperE; ++SuperI) {
QualType CanonicalSuperT = Context.getCanonicalType(*SuperI);
// SubT must be SuperT or derived from it, or pointer or reference to
// such types.
if (const ReferenceType *RefTy = CanonicalSuperT->getAs<ReferenceType>())
CanonicalSuperT = RefTy->getPointeeType();
if (SubIsPointer) {
if (const PointerType *PtrTy = CanonicalSuperT->getAs<PointerType>())
CanonicalSuperT = PtrTy->getPointeeType();
else {
continue;
}
}
CanonicalSuperT = CanonicalSuperT.getLocalUnqualifiedType();
// If the types are the same, move on to the next type in the subset.
if (CanonicalSubT == CanonicalSuperT) {
Contained = true;
break;
}
// Otherwise we need to check the inheritance.
if (!SubIsClass || !CanonicalSuperT->isRecordType())
continue;
Paths.clear();
if (!IsDerivedFrom(CanonicalSubT, CanonicalSuperT, Paths))
continue;
if (Paths.isAmbiguous(CanonicalSuperT))
continue;
// Do this check from a context without privileges.
switch (CheckBaseClassAccess(SourceLocation(), false,
CanonicalSuperT, CanonicalSubT,
Paths.front(),
/*ForceCheck*/ true,
/*ForceUnprivileged*/ true,
ADK_quiet)) {
case AR_accessible: break;
case AR_inaccessible: continue;
case AR_dependent:
llvm_unreachable("access check dependent for unprivileged context");
break;
case AR_delayed:
llvm_unreachable("access check delayed in non-declaration");
break;
}
Contained = true;
break;
}
if (!Contained) {
Diag(SubLoc, DiagID);
if (NoteID.getDiagID() != 0)
Diag(SuperLoc, NoteID);
return true;
}
}
// We've run half the gauntlet.
return CheckParamExceptionSpec(NoteID, Superset, SuperLoc, Subset, SubLoc);
}
