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-rw-r--r--lib/Sema/SemaOverload.cpp285
1 files changed, 98 insertions, 187 deletions
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index c66fe7678d..f976b76727 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -839,20 +839,12 @@ void OverloadCandidateSet::destroyCandidates() {
void OverloadCandidateSet::clear() {
destroyCandidates();
- // DiagnoseIfAttrs are just pointers, so we don't need to destroy them.
SlabAllocator.Reset();
NumInlineBytesUsed = 0;
Candidates.clear();
Functions.clear();
}
-DiagnoseIfAttr **
-OverloadCandidateSet::addDiagnoseIfComplaints(ArrayRef<DiagnoseIfAttr *> CA) {
- auto *DIA = slabAllocate<DiagnoseIfAttr *>(CA.size());
- std::uninitialized_copy(CA.begin(), CA.end(), DIA);
- return DIA;
-}
-
namespace {
class UnbridgedCastsSet {
struct Entry {
@@ -5831,28 +5823,6 @@ static bool IsAcceptableNonMemberOperatorCandidate(ASTContext &Context,
return false;
}
-static void initDiagnoseIfComplaint(Sema &S, OverloadCandidateSet &CandidateSet,
- OverloadCandidate &Candidate,
- FunctionDecl *Function,
- ArrayRef<Expr *> Args,
- bool MissingImplicitThis = false,
- Expr *ExplicitThis = nullptr) {
- SmallVector<DiagnoseIfAttr *, 8> Results;
- if (DiagnoseIfAttr *DIA = S.checkArgDependentDiagnoseIf(
- Function, Args, Results, MissingImplicitThis, ExplicitThis)) {
- Results.clear();
- Results.push_back(DIA);
- }
-
- Candidate.NumTriggeredDiagnoseIfs = Results.size();
- if (Results.empty())
- Candidate.DiagnoseIfInfo = nullptr;
- else if (Results.size() == 1)
- Candidate.DiagnoseIfInfo = Results[0];
- else
- Candidate.DiagnoseIfInfo = CandidateSet.addDiagnoseIfComplaints(Results);
-}
-
/// AddOverloadCandidate - Adds the given function to the set of
/// candidate functions, using the given function call arguments. If
/// @p SuppressUserConversions, then don't allow user-defined
@@ -5886,10 +5856,9 @@ Sema::AddOverloadCandidate(FunctionDecl *Function,
// object argument (C++ [over.call.func]p3), and the acting context
// is irrelevant.
AddMethodCandidate(Method, FoundDecl, Method->getParent(), QualType(),
- Expr::Classification::makeSimpleLValue(),
- /*ThisArg=*/nullptr, Args, CandidateSet,
- SuppressUserConversions, PartialOverloading,
- EarlyConversions);
+ Expr::Classification::makeSimpleLValue(), Args,
+ CandidateSet, SuppressUserConversions,
+ PartialOverloading, EarlyConversions);
return;
}
// We treat a constructor like a non-member function, since its object
@@ -6050,8 +6019,6 @@ Sema::AddOverloadCandidate(FunctionDecl *Function,
Candidate.FailureKind = ovl_fail_ext_disabled;
return;
}
-
- initDiagnoseIfComplaint(*this, CandidateSet, Candidate, Function, Args);
}
ObjCMethodDecl *
@@ -6260,85 +6227,73 @@ EnableIfAttr *Sema::CheckEnableIf(FunctionDecl *Function, ArrayRef<Expr *> Args,
return nullptr;
}
-static bool gatherDiagnoseIfAttrs(FunctionDecl *Function, bool ArgDependent,
- SmallVectorImpl<DiagnoseIfAttr *> &Errors,
- SmallVectorImpl<DiagnoseIfAttr *> &Nonfatal) {
- for (auto *DIA : Function->specific_attrs<DiagnoseIfAttr>())
- if (ArgDependent == DIA->getArgDependent()) {
- if (DIA->isError())
- Errors.push_back(DIA);
- else
- Nonfatal.push_back(DIA);
- }
+template <typename CheckFn>
+static bool diagnoseDiagnoseIfAttrsWith(Sema &S, const FunctionDecl *FD,
+ bool ArgDependent, SourceLocation Loc,
+ CheckFn &&IsSuccessful) {
+ SmallVector<const DiagnoseIfAttr *, 8> Attrs;
+ for (const auto *DIA : FD->specific_attrs<DiagnoseIfAttr>()) {
+ if (ArgDependent == DIA->getArgDependent())
+ Attrs.push_back(DIA);
+ }
- return !Errors.empty() || !Nonfatal.empty();
-}
+ // Common case: No diagnose_if attributes, so we can quit early.
+ if (Attrs.empty())
+ return false;
+
+ auto WarningBegin = std::stable_partition(
+ Attrs.begin(), Attrs.end(),
+ [](const DiagnoseIfAttr *DIA) { return DIA->isError(); });
-template <typename CheckFn>
-static DiagnoseIfAttr *
-checkDiagnoseIfAttrsWith(const SmallVectorImpl<DiagnoseIfAttr *> &Errors,
- SmallVectorImpl<DiagnoseIfAttr *> &Nonfatal,
- CheckFn &&IsSuccessful) {
// Note that diagnose_if attributes are late-parsed, so they appear in the
// correct order (unlike enable_if attributes).
- auto ErrAttr = llvm::find_if(Errors, IsSuccessful);
- if (ErrAttr != Errors.end())
- return *ErrAttr;
-
- llvm::erase_if(Nonfatal, [&](DiagnoseIfAttr *A) { return !IsSuccessful(A); });
- return nullptr;
-}
-
-DiagnoseIfAttr *
-Sema::checkArgDependentDiagnoseIf(FunctionDecl *Function, ArrayRef<Expr *> Args,
- SmallVectorImpl<DiagnoseIfAttr *> &Nonfatal,
- bool MissingImplicitThis,
- Expr *ThisArg) {
- SmallVector<DiagnoseIfAttr *, 4> Errors;
- if (!gatherDiagnoseIfAttrs(Function, /*ArgDependent=*/true, Errors, Nonfatal))
- return nullptr;
+ auto ErrAttr = llvm::find_if(llvm::make_range(Attrs.begin(), WarningBegin),
+ IsSuccessful);
+ if (ErrAttr != WarningBegin) {
+ const DiagnoseIfAttr *DIA = *ErrAttr;
+ S.Diag(Loc, diag::err_diagnose_if_succeeded) << DIA->getMessage();
+ S.Diag(DIA->getLocation(), diag::note_from_diagnose_if)
+ << DIA->getParent() << DIA->getCond()->getSourceRange();
+ return true;
+ }
- SFINAETrap Trap(*this);
- SmallVector<Expr *, 16> ConvertedArgs;
- Expr *ConvertedThis;
- if (!convertArgsForAvailabilityChecks(*this, Function, ThisArg, Args, Trap,
- MissingImplicitThis, ConvertedThis,
- ConvertedArgs))
- return nullptr;
+ for (const auto *DIA : llvm::make_range(WarningBegin, Attrs.end()))
+ if (IsSuccessful(DIA)) {
+ S.Diag(Loc, diag::warn_diagnose_if_succeeded) << DIA->getMessage();
+ S.Diag(DIA->getLocation(), diag::note_from_diagnose_if)
+ << DIA->getParent() << DIA->getCond()->getSourceRange();
+ }
- return checkDiagnoseIfAttrsWith(Errors, Nonfatal, [&](DiagnoseIfAttr *DIA) {
- APValue Result;
- // It's sane to use the same ConvertedArgs for any redecl of this function,
- // since EvaluateWithSubstitution only cares about the position of each
- // argument in the arg list, not the ParmVarDecl* it maps to.
- if (!DIA->getCond()->EvaluateWithSubstitution(
- Result, Context, DIA->getParent(), ConvertedArgs, ConvertedThis))
- return false;
- return Result.isInt() && Result.getInt().getBoolValue();
- });
+ return false;
}
-DiagnoseIfAttr *Sema::checkArgIndependentDiagnoseIf(
- FunctionDecl *Function, SmallVectorImpl<DiagnoseIfAttr *> &Nonfatal) {
- SmallVector<DiagnoseIfAttr *, 4> Errors;
- if (!gatherDiagnoseIfAttrs(Function, /*ArgDependent=*/false, Errors,
- Nonfatal))
- return nullptr;
-
- return checkDiagnoseIfAttrsWith(Errors, Nonfatal, [&](DiagnoseIfAttr *DIA) {
- bool Result;
- return DIA->getCond()->EvaluateAsBooleanCondition(Result, Context) &&
- Result;
- });
+bool Sema::diagnoseArgDependentDiagnoseIfAttrs(const FunctionDecl *Function,
+ const Expr *ThisArg,
+ ArrayRef<const Expr *> Args,
+ SourceLocation Loc) {
+ return diagnoseDiagnoseIfAttrsWith(
+ *this, Function, /*ArgDependent=*/true, Loc,
+ [&](const DiagnoseIfAttr *DIA) {
+ APValue Result;
+ // It's sane to use the same Args for any redecl of this function, since
+ // EvaluateWithSubstitution only cares about the position of each
+ // argument in the arg list, not the ParmVarDecl* it maps to.
+ if (!DIA->getCond()->EvaluateWithSubstitution(
+ Result, Context, DIA->getParent(), Args, ThisArg))
+ return false;
+ return Result.isInt() && Result.getInt().getBoolValue();
+ });
}
-void Sema::emitDiagnoseIfDiagnostic(SourceLocation Loc,
- const DiagnoseIfAttr *DIA) {
- auto Code = DIA->isError() ? diag::err_diagnose_if_succeeded
- : diag::warn_diagnose_if_succeeded;
- Diag(Loc, Code) << DIA->getMessage();
- Diag(DIA->getLocation(), diag::note_from_diagnose_if)
- << DIA->getParent() << DIA->getCond()->getSourceRange();
+bool Sema::diagnoseArgIndependentDiagnoseIfAttrs(const FunctionDecl *Function,
+ SourceLocation Loc) {
+ return diagnoseDiagnoseIfAttrsWith(
+ *this, Function, /*ArgDependent=*/false, Loc,
+ [&](const DiagnoseIfAttr *DIA) {
+ bool Result;
+ return DIA->getCond()->EvaluateAsBooleanCondition(Result, Context) &&
+ Result;
+ });
}
/// \brief Add all of the function declarations in the given function set to
@@ -6356,8 +6311,8 @@ void Sema::AddFunctionCandidates(const UnresolvedSetImpl &Fns,
AddMethodCandidate(cast<CXXMethodDecl>(FD), F.getPair(),
cast<CXXMethodDecl>(FD)->getParent(),
Args[0]->getType(), Args[0]->Classify(Context),
- Args[0], Args.slice(1), CandidateSet,
- SuppressUserConversions, PartialOverloading);
+ Args.slice(1), CandidateSet, SuppressUserConversions,
+ PartialOverloading);
else
AddOverloadCandidate(FD, F.getPair(), Args, CandidateSet,
SuppressUserConversions, PartialOverloading);
@@ -6369,7 +6324,7 @@ void Sema::AddFunctionCandidates(const UnresolvedSetImpl &Fns,
FunTmpl, F.getPair(),
cast<CXXRecordDecl>(FunTmpl->getDeclContext()),
ExplicitTemplateArgs, Args[0]->getType(),
- Args[0]->Classify(Context), Args[0], Args.slice(1), CandidateSet,
+ Args[0]->Classify(Context), Args.slice(1), CandidateSet,
SuppressUserConversions, PartialOverloading);
else
AddTemplateOverloadCandidate(FunTmpl, F.getPair(),
@@ -6385,7 +6340,6 @@ void Sema::AddFunctionCandidates(const UnresolvedSetImpl &Fns,
void Sema::AddMethodCandidate(DeclAccessPair FoundDecl,
QualType ObjectType,
Expr::Classification ObjectClassification,
- Expr *ThisArg,
ArrayRef<Expr *> Args,
OverloadCandidateSet& CandidateSet,
bool SuppressUserConversions) {
@@ -6399,15 +6353,13 @@ void Sema::AddMethodCandidate(DeclAccessPair FoundDecl,
assert(isa<CXXMethodDecl>(TD->getTemplatedDecl()) &&
"Expected a member function template");
AddMethodTemplateCandidate(TD, FoundDecl, ActingContext,
- /*ExplicitArgs*/ nullptr,
- ObjectType, ObjectClassification,
- ThisArg, Args, CandidateSet,
+ /*ExplicitArgs*/ nullptr, ObjectType,
+ ObjectClassification, Args, CandidateSet,
SuppressUserConversions);
} else {
AddMethodCandidate(cast<CXXMethodDecl>(Decl), FoundDecl, ActingContext,
- ObjectType, ObjectClassification,
- ThisArg, Args,
- CandidateSet, SuppressUserConversions);
+ ObjectType, ObjectClassification, Args, CandidateSet,
+ SuppressUserConversions);
}
}
@@ -6422,7 +6374,7 @@ void
Sema::AddMethodCandidate(CXXMethodDecl *Method, DeclAccessPair FoundDecl,
CXXRecordDecl *ActingContext, QualType ObjectType,
Expr::Classification ObjectClassification,
- Expr *ThisArg, ArrayRef<Expr *> Args,
+ ArrayRef<Expr *> Args,
OverloadCandidateSet &CandidateSet,
bool SuppressUserConversions,
bool PartialOverloading,
@@ -6544,9 +6496,6 @@ Sema::AddMethodCandidate(CXXMethodDecl *Method, DeclAccessPair FoundDecl,
Candidate.DeductionFailure.Data = FailedAttr;
return;
}
-
- initDiagnoseIfComplaint(*this, CandidateSet, Candidate, Method, Args,
- /*MissingImplicitThis=*/!ThisArg, ThisArg);
}
/// \brief Add a C++ member function template as a candidate to the candidate
@@ -6559,7 +6508,6 @@ Sema::AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
TemplateArgumentListInfo *ExplicitTemplateArgs,
QualType ObjectType,
Expr::Classification ObjectClassification,
- Expr *ThisArg,
ArrayRef<Expr *> Args,
OverloadCandidateSet& CandidateSet,
bool SuppressUserConversions,
@@ -6613,9 +6561,9 @@ Sema::AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
assert(isa<CXXMethodDecl>(Specialization) &&
"Specialization is not a member function?");
AddMethodCandidate(cast<CXXMethodDecl>(Specialization), FoundDecl,
- ActingContext, ObjectType, ObjectClassification,
- /*ThisArg=*/ThisArg, Args, CandidateSet,
- SuppressUserConversions, PartialOverloading, Conversions);
+ ActingContext, ObjectType, ObjectClassification, Args,
+ CandidateSet, SuppressUserConversions, PartialOverloading,
+ Conversions);
}
/// \brief Add a C++ function template specialization as a candidate
@@ -6942,8 +6890,6 @@ Sema::AddConversionCandidate(CXXConversionDecl *Conversion,
Candidate.DeductionFailure.Data = FailedAttr;
return;
}
-
- initDiagnoseIfComplaint(*this, CandidateSet, Candidate, Conversion, None, false, From);
}
/// \brief Adds a conversion function template specialization
@@ -7096,8 +7042,6 @@ void Sema::AddSurrogateCandidate(CXXConversionDecl *Conversion,
Candidate.DeductionFailure.Data = FailedAttr;
return;
}
-
- initDiagnoseIfComplaint(*this, CandidateSet, Candidate, Conversion, None);
}
/// \brief Add overload candidates for overloaded operators that are
@@ -7146,7 +7090,7 @@ void Sema::AddMemberOperatorCandidates(OverloadedOperatorKind Op,
Oper != OperEnd;
++Oper)
AddMethodCandidate(Oper.getPair(), Args[0]->getType(),
- Args[0]->Classify(Context), Args[0], Args.slice(1),
+ Args[0]->Classify(Context), Args.slice(1),
CandidateSet, /*SuppressUserConversions=*/false);
}
}
@@ -9178,17 +9122,6 @@ void Sema::diagnoseEquivalentInternalLinkageDeclarations(
}
}
-static bool isCandidateUnavailableDueToDiagnoseIf(const OverloadCandidate &OC) {
- ArrayRef<DiagnoseIfAttr *> Info = OC.getDiagnoseIfInfo();
- if (!Info.empty() && Info[0]->isError())
- return true;
-
- assert(llvm::all_of(Info,
- [](const DiagnoseIfAttr *A) { return !A->isError(); }) &&
- "DiagnoseIf info shouldn't have mixed warnings and errors.");
- return false;
-}
-
/// \brief Computes the best viable function (C++ 13.3.3)
/// within an overload candidate set.
///
@@ -9267,19 +9200,13 @@ OverloadCandidateSet::BestViableFunction(Sema &S, SourceLocation Loc,
// Best is the best viable function.
if (Best->Function &&
(Best->Function->isDeleted() ||
- S.isFunctionConsideredUnavailable(Best->Function) ||
- isCandidateUnavailableDueToDiagnoseIf(*Best)))
+ S.isFunctionConsideredUnavailable(Best->Function)))
return OR_Deleted;
if (!EquivalentCands.empty())
S.diagnoseEquivalentInternalLinkageDeclarations(Loc, Best->Function,
EquivalentCands);
- for (const auto *W : Best->getDiagnoseIfInfo()) {
- assert(W->isWarning() && "Errors should've been caught earlier!");
- S.emitDiagnoseIfDiagnostic(Loc, W);
- }
-
return OR_Success;
}
@@ -10162,14 +10089,6 @@ static void NoteFunctionCandidate(Sema &S, OverloadCandidate *Cand,
MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl);
return;
}
- if (isCandidateUnavailableDueToDiagnoseIf(*Cand)) {
- auto *A = Cand->DiagnoseIfInfo.get<DiagnoseIfAttr *>();
- assert(A->isError() && "Non-error diagnose_if disables a candidate?");
- S.Diag(Cand->Function->getLocation(),
- diag::note_ovl_candidate_disabled_by_function_cond_attr)
- << A->getCond()->getSourceRange() << A->getMessage();
- return;
- }
// We don't really have anything else to say about viable candidates.
S.NoteOverloadCandidate(Cand->FoundDecl, Fn);
@@ -12113,6 +12032,10 @@ Sema::CreateOverloadedUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
if (CheckCallReturnType(FnDecl->getReturnType(), OpLoc, TheCall, FnDecl))
return ExprError();
+ if (CheckFunctionCall(FnDecl, TheCall,
+ FnDecl->getType()->castAs<FunctionProtoType>()))
+ return ExprError();
+
return MaybeBindToTemporary(TheCall);
} else {
// We matched a built-in operator. Convert the arguments, then
@@ -12343,16 +12266,20 @@ Sema::CreateOverloadedBinOp(SourceLocation OpLoc,
return ExprError();
ArrayRef<const Expr *> ArgsArray(Args, 2);
+ const Expr *ImplicitThis = nullptr;
// Cut off the implicit 'this'.
- if (isa<CXXMethodDecl>(FnDecl))
+ if (isa<CXXMethodDecl>(FnDecl)) {
+ ImplicitThis = ArgsArray[0];
ArgsArray = ArgsArray.slice(1);
+ }
// Check for a self move.
if (Op == OO_Equal)
DiagnoseSelfMove(Args[0], Args[1], OpLoc);
- checkCall(FnDecl, nullptr, ArgsArray, isa<CXXMethodDecl>(FnDecl), OpLoc,
- TheCall->getSourceRange(), VariadicDoesNotApply);
+ checkCall(FnDecl, nullptr, ImplicitThis, ArgsArray,
+ isa<CXXMethodDecl>(FnDecl), OpLoc, TheCall->getSourceRange(),
+ VariadicDoesNotApply);
return MaybeBindToTemporary(TheCall);
} else {
@@ -12561,6 +12488,10 @@ Sema::CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
if (CheckCallReturnType(FnDecl->getReturnType(), LLoc, TheCall, FnDecl))
return ExprError();
+ if (CheckFunctionCall(Method, TheCall,
+ Method->getType()->castAs<FunctionProtoType>()))
+ return ExprError();
+
return MaybeBindToTemporary(TheCall);
} else {
// We matched a built-in operator. Convert the arguments, then
@@ -12727,16 +12658,6 @@ Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE,
TemplateArgs = &TemplateArgsBuffer;
}
- // Poor-programmer's Lazy<Expr *>; isImplicitAccess requires stripping
- // parens/casts, which would be nice to avoid potentially doing multiple
- // times.
- llvm::Optional<Expr *> UnresolvedBase;
- auto GetUnresolvedBase = [&] {
- if (!UnresolvedBase.hasValue())
- UnresolvedBase =
- UnresExpr->isImplicitAccess() ? nullptr : UnresExpr->getBase();
- return *UnresolvedBase;
- };
for (UnresolvedMemberExpr::decls_iterator I = UnresExpr->decls_begin(),
E = UnresExpr->decls_end(); I != E; ++I) {
@@ -12757,14 +12678,12 @@ Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE,
continue;
AddMethodCandidate(Method, I.getPair(), ActingDC, ObjectType,
- ObjectClassification,
- /*ThisArg=*/GetUnresolvedBase(), Args, CandidateSet,
+ ObjectClassification, Args, CandidateSet,
/*SuppressUserConversions=*/false);
} else {
AddMethodTemplateCandidate(
cast<FunctionTemplateDecl>(Func), I.getPair(), ActingDC,
- TemplateArgs, ObjectType, ObjectClassification,
- /*ThisArg=*/GetUnresolvedBase(), Args, CandidateSet,
+ TemplateArgs, ObjectType, ObjectClassification, Args, CandidateSet,
/*SuppressUsedConversions=*/false);
}
}
@@ -12882,16 +12801,6 @@ Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE,
<< Attr->getCond()->getSourceRange() << Attr->getMessage();
return ExprError();
}
-
- SmallVector<DiagnoseIfAttr *, 4> Nonfatal;
- if (const DiagnoseIfAttr *Attr = checkArgDependentDiagnoseIf(
- Method, Args, Nonfatal, false, MemE->getBase())) {
- emitDiagnoseIfDiagnostic(MemE->getMemberLoc(), Attr);
- return ExprError();
- }
-
- for (const auto *Attr : Nonfatal)
- emitDiagnoseIfDiagnostic(MemE->getMemberLoc(), Attr);
}
if ((isa<CXXConstructorDecl>(CurContext) ||
@@ -12970,9 +12879,8 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Obj,
for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end();
Oper != OperEnd; ++Oper) {
AddMethodCandidate(Oper.getPair(), Object.get()->getType(),
- Object.get()->Classify(Context),
- Object.get(), Args, CandidateSet,
- /*SuppressUserConversions=*/ false);
+ Object.get()->Classify(Context), Args, CandidateSet,
+ /*SuppressUserConversions=*/false);
}
// C++ [over.call.object]p2:
@@ -13247,8 +13155,7 @@ Sema::BuildOverloadedArrowExpr(Scope *S, Expr *Base, SourceLocation OpLoc,
for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end();
Oper != OperEnd; ++Oper) {
AddMethodCandidate(Oper.getPair(), Base->getType(), Base->Classify(Context),
- Base, None, CandidateSet,
- /*SuppressUserConversions=*/false);
+ None, CandidateSet, /*SuppressUserConversions=*/false);
}
bool HadMultipleCandidates = (CandidateSet.size() > 1);
@@ -13322,7 +13229,11 @@ Sema::BuildOverloadedArrowExpr(Scope *S, Expr *Base, SourceLocation OpLoc,
Base, ResultTy, VK, OpLoc, false);
if (CheckCallReturnType(Method->getReturnType(), OpLoc, TheCall, Method))
- return ExprError();
+ return ExprError();
+
+ if (CheckFunctionCall(Method, TheCall,
+ Method->getType()->castAs<FunctionProtoType>()))
+ return ExprError();
return MaybeBindToTemporary(TheCall);
}