1 //===--- SemaDeclAttr.cpp - Declaration Attribute Handling ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements decl-related attribute processing.
12 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ASTConsumer.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ASTMutationListener.h"
17 #include "clang/AST/CXXInheritance.h"
18 #include "clang/AST/DeclCXX.h"
19 #include "clang/AST/DeclObjC.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/ExprCXX.h"
23 #include "clang/AST/Mangle.h"
24 #include "clang/AST/RecursiveASTVisitor.h"
25 #include "clang/Basic/CharInfo.h"
26 #include "clang/Basic/SourceManager.h"
27 #include "clang/Basic/TargetInfo.h"
28 #include "clang/Lex/Preprocessor.h"
29 #include "clang/Sema/DeclSpec.h"
30 #include "clang/Sema/DelayedDiagnostic.h"
31 #include "clang/Sema/Initialization.h"
32 #include "clang/Sema/Lookup.h"
33 #include "clang/Sema/Scope.h"
34 #include "clang/Sema/SemaInternal.h"
35 #include "llvm/ADT/STLExtras.h"
36 #include "llvm/ADT/StringExtras.h"
37 #include "llvm/Support/MathExtras.h"
39 using namespace clang;
42 namespace AttributeLangSupport {
48 } // end namespace AttributeLangSupport
50 //===----------------------------------------------------------------------===//
52 //===----------------------------------------------------------------------===//
54 /// isFunctionOrMethod - Return true if the given decl has function
55 /// type (function or function-typed variable) or an Objective-C
57 static bool isFunctionOrMethod(const Decl *D) {
58 return (D->getFunctionType() != nullptr) || isa<ObjCMethodDecl>(D);
61 /// \brief Return true if the given decl has function type (function or
62 /// function-typed variable) or an Objective-C method or a block.
63 static bool isFunctionOrMethodOrBlock(const Decl *D) {
64 return isFunctionOrMethod(D) || isa<BlockDecl>(D);
67 /// Return true if the given decl has a declarator that should have
68 /// been processed by Sema::GetTypeForDeclarator.
69 static bool hasDeclarator(const Decl *D) {
70 // In some sense, TypedefDecl really *ought* to be a DeclaratorDecl.
71 return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) ||
72 isa<ObjCPropertyDecl>(D);
75 /// hasFunctionProto - Return true if the given decl has a argument
76 /// information. This decl should have already passed
77 /// isFunctionOrMethod or isFunctionOrMethodOrBlock.
78 static bool hasFunctionProto(const Decl *D) {
79 if (const FunctionType *FnTy = D->getFunctionType())
80 return isa<FunctionProtoType>(FnTy);
81 return isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D);
84 /// getFunctionOrMethodNumParams - Return number of function or method
85 /// parameters. It is an error to call this on a K&R function (use
86 /// hasFunctionProto first).
87 static unsigned getFunctionOrMethodNumParams(const Decl *D) {
88 if (const FunctionType *FnTy = D->getFunctionType())
89 return cast<FunctionProtoType>(FnTy)->getNumParams();
90 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
91 return BD->getNumParams();
92 return cast<ObjCMethodDecl>(D)->param_size();
95 static QualType getFunctionOrMethodParamType(const Decl *D, unsigned Idx) {
96 if (const FunctionType *FnTy = D->getFunctionType())
97 return cast<FunctionProtoType>(FnTy)->getParamType(Idx);
98 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
99 return BD->getParamDecl(Idx)->getType();
101 return cast<ObjCMethodDecl>(D)->parameters()[Idx]->getType();
104 static SourceRange getFunctionOrMethodParamRange(const Decl *D, unsigned Idx) {
105 if (const auto *FD = dyn_cast<FunctionDecl>(D))
106 return FD->getParamDecl(Idx)->getSourceRange();
107 if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
108 return MD->parameters()[Idx]->getSourceRange();
109 if (const auto *BD = dyn_cast<BlockDecl>(D))
110 return BD->getParamDecl(Idx)->getSourceRange();
111 return SourceRange();
114 static QualType getFunctionOrMethodResultType(const Decl *D) {
115 if (const FunctionType *FnTy = D->getFunctionType())
116 return cast<FunctionType>(FnTy)->getReturnType();
117 return cast<ObjCMethodDecl>(D)->getReturnType();
120 static SourceRange getFunctionOrMethodResultSourceRange(const Decl *D) {
121 if (const auto *FD = dyn_cast<FunctionDecl>(D))
122 return FD->getReturnTypeSourceRange();
123 if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
124 return MD->getReturnTypeSourceRange();
125 return SourceRange();
128 static bool isFunctionOrMethodVariadic(const Decl *D) {
129 if (const FunctionType *FnTy = D->getFunctionType()) {
130 const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy);
131 return proto->isVariadic();
133 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
134 return BD->isVariadic();
136 return cast<ObjCMethodDecl>(D)->isVariadic();
139 static bool isInstanceMethod(const Decl *D) {
140 if (const CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D))
141 return MethodDecl->isInstance();
145 static inline bool isNSStringType(QualType T, ASTContext &Ctx) {
146 const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>();
150 ObjCInterfaceDecl *Cls = PT->getObjectType()->getInterface();
154 IdentifierInfo* ClsName = Cls->getIdentifier();
156 // FIXME: Should we walk the chain of classes?
157 return ClsName == &Ctx.Idents.get("NSString") ||
158 ClsName == &Ctx.Idents.get("NSMutableString");
161 static inline bool isCFStringType(QualType T, ASTContext &Ctx) {
162 const PointerType *PT = T->getAs<PointerType>();
166 const RecordType *RT = PT->getPointeeType()->getAs<RecordType>();
170 const RecordDecl *RD = RT->getDecl();
171 if (RD->getTagKind() != TTK_Struct)
174 return RD->getIdentifier() == &Ctx.Idents.get("__CFString");
177 static unsigned getNumAttributeArgs(const AttributeList &Attr) {
178 // FIXME: Include the type in the argument list.
179 return Attr.getNumArgs() + Attr.hasParsedType();
182 template <typename Compare>
183 static bool checkAttributeNumArgsImpl(Sema &S, const AttributeList &Attr,
184 unsigned Num, unsigned Diag,
186 if (Comp(getNumAttributeArgs(Attr), Num)) {
187 S.Diag(Attr.getLoc(), Diag) << Attr.getName() << Num;
194 /// \brief Check if the attribute has exactly as many args as Num. May
196 static bool checkAttributeNumArgs(Sema &S, const AttributeList &Attr,
198 return checkAttributeNumArgsImpl(S, Attr, Num,
199 diag::err_attribute_wrong_number_arguments,
200 std::not_equal_to<unsigned>());
203 /// \brief Check if the attribute has at least as many args as Num. May
205 static bool checkAttributeAtLeastNumArgs(Sema &S, const AttributeList &Attr,
207 return checkAttributeNumArgsImpl(S, Attr, Num,
208 diag::err_attribute_too_few_arguments,
209 std::less<unsigned>());
212 /// \brief Check if the attribute has at most as many args as Num. May
214 static bool checkAttributeAtMostNumArgs(Sema &S, const AttributeList &Attr,
216 return checkAttributeNumArgsImpl(S, Attr, Num,
217 diag::err_attribute_too_many_arguments,
218 std::greater<unsigned>());
221 /// \brief A helper function to provide Attribute Location for the Attr types
222 /// AND the AttributeList.
223 template <typename AttrInfo>
224 static typename std::enable_if<std::is_base_of<clang::Attr, AttrInfo>::value,
225 SourceLocation>::type
226 getAttrLoc(const AttrInfo &Attr) {
227 return Attr.getLocation();
229 static SourceLocation getAttrLoc(const clang::AttributeList &Attr) {
230 return Attr.getLoc();
233 /// \brief A helper function to provide Attribute Name for the Attr types
234 /// AND the AttributeList.
235 template <typename AttrInfo>
236 static typename std::enable_if<std::is_base_of<clang::Attr, AttrInfo>::value,
237 const AttrInfo *>::type
238 getAttrName(const AttrInfo &Attr) {
241 const IdentifierInfo *getAttrName(const clang::AttributeList &Attr) {
242 return Attr.getName();
245 /// \brief If Expr is a valid integer constant, get the value of the integer
246 /// expression and return success or failure. May output an error.
247 template<typename AttrInfo>
248 static bool checkUInt32Argument(Sema &S, const AttrInfo& Attr, const Expr *Expr,
249 uint32_t &Val, unsigned Idx = UINT_MAX) {
251 if (Expr->isTypeDependent() || Expr->isValueDependent() ||
252 !Expr->isIntegerConstantExpr(I, S.Context)) {
254 S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_n_type)
255 << getAttrName(Attr) << Idx << AANT_ArgumentIntegerConstant
256 << Expr->getSourceRange();
258 S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_type)
259 << getAttrName(Attr) << AANT_ArgumentIntegerConstant
260 << Expr->getSourceRange();
265 S.Diag(Expr->getExprLoc(), diag::err_ice_too_large)
266 << I.toString(10, false) << 32 << /* Unsigned */ 1;
270 Val = (uint32_t)I.getZExtValue();
274 /// \brief Wrapper around checkUInt32Argument, with an extra check to be sure
275 /// that the result will fit into a regular (signed) int. All args have the same
276 /// purpose as they do in checkUInt32Argument.
277 template<typename AttrInfo>
278 static bool checkPositiveIntArgument(Sema &S, const AttrInfo& Attr, const Expr *Expr,
279 int &Val, unsigned Idx = UINT_MAX) {
281 if (!checkUInt32Argument(S, Attr, Expr, UVal, Idx))
284 if (UVal > (uint32_t)std::numeric_limits<int>::max()) {
285 llvm::APSInt I(32); // for toString
287 S.Diag(Expr->getExprLoc(), diag::err_ice_too_large)
288 << I.toString(10, false) << 32 << /* Unsigned */ 0;
296 /// \brief Diagnose mutually exclusive attributes when present on a given
297 /// declaration. Returns true if diagnosed.
298 template <typename AttrTy>
299 static bool checkAttrMutualExclusion(Sema &S, Decl *D, SourceRange Range,
300 IdentifierInfo *Ident) {
301 if (AttrTy *A = D->getAttr<AttrTy>()) {
302 S.Diag(Range.getBegin(), diag::err_attributes_are_not_compatible) << Ident
304 S.Diag(A->getLocation(), diag::note_conflicting_attribute);
310 /// \brief Check if IdxExpr is a valid parameter index for a function or
311 /// instance method D. May output an error.
313 /// \returns true if IdxExpr is a valid index.
314 template <typename AttrInfo>
315 static bool checkFunctionOrMethodParameterIndex(
316 Sema &S, const Decl *D, const AttrInfo& Attr,
317 unsigned AttrArgNum, const Expr *IdxExpr, uint64_t &Idx) {
318 assert(isFunctionOrMethodOrBlock(D));
320 // In C++ the implicit 'this' function parameter also counts.
321 // Parameters are counted from one.
322 bool HP = hasFunctionProto(D);
323 bool HasImplicitThisParam = isInstanceMethod(D);
324 bool IV = HP && isFunctionOrMethodVariadic(D);
326 (HP ? getFunctionOrMethodNumParams(D) : 0) + HasImplicitThisParam;
329 if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() ||
330 !IdxExpr->isIntegerConstantExpr(IdxInt, S.Context)) {
331 S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_n_type)
332 << getAttrName(Attr) << AttrArgNum << AANT_ArgumentIntegerConstant
333 << IdxExpr->getSourceRange();
337 Idx = IdxInt.getLimitedValue();
338 if (Idx < 1 || (!IV && Idx > NumParams)) {
339 S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_out_of_bounds)
340 << getAttrName(Attr) << AttrArgNum << IdxExpr->getSourceRange();
343 Idx--; // Convert to zero-based.
344 if (HasImplicitThisParam) {
346 S.Diag(getAttrLoc(Attr),
347 diag::err_attribute_invalid_implicit_this_argument)
348 << getAttrName(Attr) << IdxExpr->getSourceRange();
357 /// \brief Check if the argument \p ArgNum of \p Attr is a ASCII string literal.
358 /// If not emit an error and return false. If the argument is an identifier it
359 /// will emit an error with a fixit hint and treat it as if it was a string
361 bool Sema::checkStringLiteralArgumentAttr(const AttributeList &Attr,
362 unsigned ArgNum, StringRef &Str,
363 SourceLocation *ArgLocation) {
364 // Look for identifiers. If we have one emit a hint to fix it to a literal.
365 if (Attr.isArgIdent(ArgNum)) {
366 IdentifierLoc *Loc = Attr.getArgAsIdent(ArgNum);
367 Diag(Loc->Loc, diag::err_attribute_argument_type)
368 << Attr.getName() << AANT_ArgumentString
369 << FixItHint::CreateInsertion(Loc->Loc, "\"")
370 << FixItHint::CreateInsertion(getLocForEndOfToken(Loc->Loc), "\"");
371 Str = Loc->Ident->getName();
373 *ArgLocation = Loc->Loc;
377 // Now check for an actual string literal.
378 Expr *ArgExpr = Attr.getArgAsExpr(ArgNum);
379 StringLiteral *Literal = dyn_cast<StringLiteral>(ArgExpr->IgnoreParenCasts());
381 *ArgLocation = ArgExpr->getLocStart();
383 if (!Literal || !Literal->isAscii()) {
384 Diag(ArgExpr->getLocStart(), diag::err_attribute_argument_type)
385 << Attr.getName() << AANT_ArgumentString;
389 Str = Literal->getString();
393 /// \brief Applies the given attribute to the Decl without performing any
394 /// additional semantic checking.
395 template <typename AttrType>
396 static void handleSimpleAttribute(Sema &S, Decl *D,
397 const AttributeList &Attr) {
398 D->addAttr(::new (S.Context) AttrType(Attr.getRange(), S.Context,
399 Attr.getAttributeSpellingListIndex()));
402 template <typename AttrType>
403 static void handleSimpleAttributeWithExclusions(Sema &S, Decl *D,
404 const AttributeList &Attr) {
405 handleSimpleAttribute<AttrType>(S, D, Attr);
408 /// \brief Applies the given attribute to the Decl so long as the Decl doesn't
409 /// already have one of the given incompatible attributes.
410 template <typename AttrType, typename IncompatibleAttrType,
411 typename... IncompatibleAttrTypes>
412 static void handleSimpleAttributeWithExclusions(Sema &S, Decl *D,
413 const AttributeList &Attr) {
414 if (checkAttrMutualExclusion<IncompatibleAttrType>(S, D, Attr.getRange(),
417 handleSimpleAttributeWithExclusions<AttrType, IncompatibleAttrTypes...>(S, D,
421 /// \brief Check if the passed-in expression is of type int or bool.
422 static bool isIntOrBool(Expr *Exp) {
423 QualType QT = Exp->getType();
424 return QT->isBooleanType() || QT->isIntegerType();
428 // Check to see if the type is a smart pointer of some kind. We assume
429 // it's a smart pointer if it defines both operator-> and operator*.
430 static bool threadSafetyCheckIsSmartPointer(Sema &S, const RecordType* RT) {
431 DeclContextLookupResult Res1 = RT->getDecl()->lookup(
432 S.Context.DeclarationNames.getCXXOperatorName(OO_Star));
436 DeclContextLookupResult Res2 = RT->getDecl()->lookup(
437 S.Context.DeclarationNames.getCXXOperatorName(OO_Arrow));
444 /// \brief Check if passed in Decl is a pointer type.
445 /// Note that this function may produce an error message.
446 /// \return true if the Decl is a pointer type; false otherwise
447 static bool threadSafetyCheckIsPointer(Sema &S, const Decl *D,
448 const AttributeList &Attr) {
449 const ValueDecl *vd = cast<ValueDecl>(D);
450 QualType QT = vd->getType();
451 if (QT->isAnyPointerType())
454 if (const RecordType *RT = QT->getAs<RecordType>()) {
455 // If it's an incomplete type, it could be a smart pointer; skip it.
456 // (We don't want to force template instantiation if we can avoid it,
457 // since that would alter the order in which templates are instantiated.)
458 if (RT->isIncompleteType())
461 if (threadSafetyCheckIsSmartPointer(S, RT))
465 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_pointer)
466 << Attr.getName() << QT;
470 /// \brief Checks that the passed in QualType either is of RecordType or points
471 /// to RecordType. Returns the relevant RecordType, null if it does not exit.
472 static const RecordType *getRecordType(QualType QT) {
473 if (const RecordType *RT = QT->getAs<RecordType>())
476 // Now check if we point to record type.
477 if (const PointerType *PT = QT->getAs<PointerType>())
478 return PT->getPointeeType()->getAs<RecordType>();
483 static bool checkRecordTypeForCapability(Sema &S, QualType Ty) {
484 const RecordType *RT = getRecordType(Ty);
489 // Don't check for the capability if the class hasn't been defined yet.
490 if (RT->isIncompleteType())
493 // Allow smart pointers to be used as capability objects.
494 // FIXME -- Check the type that the smart pointer points to.
495 if (threadSafetyCheckIsSmartPointer(S, RT))
498 // Check if the record itself has a capability.
499 RecordDecl *RD = RT->getDecl();
500 if (RD->hasAttr<CapabilityAttr>())
503 // Else check if any base classes have a capability.
504 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
505 CXXBasePaths BPaths(false, false);
506 if (CRD->lookupInBases([](const CXXBaseSpecifier *BS, CXXBasePath &) {
507 const auto *Type = BS->getType()->getAs<RecordType>();
508 return Type->getDecl()->hasAttr<CapabilityAttr>();
515 static bool checkTypedefTypeForCapability(QualType Ty) {
516 const auto *TD = Ty->getAs<TypedefType>();
520 TypedefNameDecl *TN = TD->getDecl();
524 return TN->hasAttr<CapabilityAttr>();
527 static bool typeHasCapability(Sema &S, QualType Ty) {
528 if (checkTypedefTypeForCapability(Ty))
531 if (checkRecordTypeForCapability(S, Ty))
537 static bool isCapabilityExpr(Sema &S, const Expr *Ex) {
538 // Capability expressions are simple expressions involving the boolean logic
539 // operators &&, || or !, a simple DeclRefExpr, CastExpr or a ParenExpr. Once
540 // a DeclRefExpr is found, its type should be checked to determine whether it
541 // is a capability or not.
543 if (const auto *E = dyn_cast<DeclRefExpr>(Ex))
544 return typeHasCapability(S, E->getType());
545 else if (const auto *E = dyn_cast<CastExpr>(Ex))
546 return isCapabilityExpr(S, E->getSubExpr());
547 else if (const auto *E = dyn_cast<ParenExpr>(Ex))
548 return isCapabilityExpr(S, E->getSubExpr());
549 else if (const auto *E = dyn_cast<UnaryOperator>(Ex)) {
550 if (E->getOpcode() == UO_LNot)
551 return isCapabilityExpr(S, E->getSubExpr());
553 } else if (const auto *E = dyn_cast<BinaryOperator>(Ex)) {
554 if (E->getOpcode() == BO_LAnd || E->getOpcode() == BO_LOr)
555 return isCapabilityExpr(S, E->getLHS()) &&
556 isCapabilityExpr(S, E->getRHS());
563 /// \brief Checks that all attribute arguments, starting from Sidx, resolve to
564 /// a capability object.
565 /// \param Sidx The attribute argument index to start checking with.
566 /// \param ParamIdxOk Whether an argument can be indexing into a function
568 static void checkAttrArgsAreCapabilityObjs(Sema &S, Decl *D,
569 const AttributeList &Attr,
570 SmallVectorImpl<Expr *> &Args,
572 bool ParamIdxOk = false) {
573 for (unsigned Idx = Sidx; Idx < Attr.getNumArgs(); ++Idx) {
574 Expr *ArgExp = Attr.getArgAsExpr(Idx);
576 if (ArgExp->isTypeDependent()) {
577 // FIXME -- need to check this again on template instantiation
578 Args.push_back(ArgExp);
582 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(ArgExp)) {
583 if (StrLit->getLength() == 0 ||
584 (StrLit->isAscii() && StrLit->getString() == StringRef("*"))) {
585 // Pass empty strings to the analyzer without warnings.
586 // Treat "*" as the universal lock.
587 Args.push_back(ArgExp);
591 // We allow constant strings to be used as a placeholder for expressions
592 // that are not valid C++ syntax, but warn that they are ignored.
593 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_ignored) <<
595 Args.push_back(ArgExp);
599 QualType ArgTy = ArgExp->getType();
601 // A pointer to member expression of the form &MyClass::mu is treated
602 // specially -- we need to look at the type of the member.
603 if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(ArgExp))
604 if (UOp->getOpcode() == UO_AddrOf)
605 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(UOp->getSubExpr()))
606 if (DRE->getDecl()->isCXXInstanceMember())
607 ArgTy = DRE->getDecl()->getType();
609 // First see if we can just cast to record type, or pointer to record type.
610 const RecordType *RT = getRecordType(ArgTy);
612 // Now check if we index into a record type function param.
613 if(!RT && ParamIdxOk) {
614 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
615 IntegerLiteral *IL = dyn_cast<IntegerLiteral>(ArgExp);
617 unsigned int NumParams = FD->getNumParams();
618 llvm::APInt ArgValue = IL->getValue();
619 uint64_t ParamIdxFromOne = ArgValue.getZExtValue();
620 uint64_t ParamIdxFromZero = ParamIdxFromOne - 1;
621 if(!ArgValue.isStrictlyPositive() || ParamIdxFromOne > NumParams) {
622 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_range)
623 << Attr.getName() << Idx + 1 << NumParams;
626 ArgTy = FD->getParamDecl(ParamIdxFromZero)->getType();
630 // If the type does not have a capability, see if the components of the
631 // expression have capabilities. This allows for writing C code where the
632 // capability may be on the type, and the expression is a capability
633 // boolean logic expression. Eg) requires_capability(A || B && !C)
634 if (!typeHasCapability(S, ArgTy) && !isCapabilityExpr(S, ArgExp))
635 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_argument_not_lockable)
636 << Attr.getName() << ArgTy;
638 Args.push_back(ArgExp);
642 //===----------------------------------------------------------------------===//
643 // Attribute Implementations
644 //===----------------------------------------------------------------------===//
646 static void handlePtGuardedVarAttr(Sema &S, Decl *D,
647 const AttributeList &Attr) {
648 if (!threadSafetyCheckIsPointer(S, D, Attr))
651 D->addAttr(::new (S.Context)
652 PtGuardedVarAttr(Attr.getRange(), S.Context,
653 Attr.getAttributeSpellingListIndex()));
656 static bool checkGuardedByAttrCommon(Sema &S, Decl *D,
657 const AttributeList &Attr,
659 SmallVector<Expr*, 1> Args;
660 // check that all arguments are lockable objects
661 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
662 unsigned Size = Args.size();
671 static void handleGuardedByAttr(Sema &S, Decl *D, const AttributeList &Attr) {
673 if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
676 D->addAttr(::new (S.Context) GuardedByAttr(Attr.getRange(), S.Context, Arg,
677 Attr.getAttributeSpellingListIndex()));
680 static void handlePtGuardedByAttr(Sema &S, Decl *D,
681 const AttributeList &Attr) {
683 if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
686 if (!threadSafetyCheckIsPointer(S, D, Attr))
689 D->addAttr(::new (S.Context) PtGuardedByAttr(Attr.getRange(),
691 Attr.getAttributeSpellingListIndex()));
694 static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D,
695 const AttributeList &Attr,
696 SmallVectorImpl<Expr *> &Args) {
697 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
700 // Check that this attribute only applies to lockable types.
701 QualType QT = cast<ValueDecl>(D)->getType();
702 if (!QT->isDependentType() && !typeHasCapability(S, QT)) {
703 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_lockable)
708 // Check that all arguments are lockable objects.
709 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
716 static void handleAcquiredAfterAttr(Sema &S, Decl *D,
717 const AttributeList &Attr) {
718 SmallVector<Expr*, 1> Args;
719 if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
722 Expr **StartArg = &Args[0];
723 D->addAttr(::new (S.Context)
724 AcquiredAfterAttr(Attr.getRange(), S.Context,
725 StartArg, Args.size(),
726 Attr.getAttributeSpellingListIndex()));
729 static void handleAcquiredBeforeAttr(Sema &S, Decl *D,
730 const AttributeList &Attr) {
731 SmallVector<Expr*, 1> Args;
732 if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
735 Expr **StartArg = &Args[0];
736 D->addAttr(::new (S.Context)
737 AcquiredBeforeAttr(Attr.getRange(), S.Context,
738 StartArg, Args.size(),
739 Attr.getAttributeSpellingListIndex()));
742 static bool checkLockFunAttrCommon(Sema &S, Decl *D,
743 const AttributeList &Attr,
744 SmallVectorImpl<Expr *> &Args) {
745 // zero or more arguments ok
746 // check that all arguments are lockable objects
747 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true);
752 static void handleAssertSharedLockAttr(Sema &S, Decl *D,
753 const AttributeList &Attr) {
754 SmallVector<Expr*, 1> Args;
755 if (!checkLockFunAttrCommon(S, D, Attr, Args))
758 unsigned Size = Args.size();
759 Expr **StartArg = Size == 0 ? nullptr : &Args[0];
760 D->addAttr(::new (S.Context)
761 AssertSharedLockAttr(Attr.getRange(), S.Context, StartArg, Size,
762 Attr.getAttributeSpellingListIndex()));
765 static void handleAssertExclusiveLockAttr(Sema &S, Decl *D,
766 const AttributeList &Attr) {
767 SmallVector<Expr*, 1> Args;
768 if (!checkLockFunAttrCommon(S, D, Attr, Args))
771 unsigned Size = Args.size();
772 Expr **StartArg = Size == 0 ? nullptr : &Args[0];
773 D->addAttr(::new (S.Context)
774 AssertExclusiveLockAttr(Attr.getRange(), S.Context,
776 Attr.getAttributeSpellingListIndex()));
779 /// \brief Checks to be sure that the given parameter number is in bounds, and is
780 /// an integral type. Will emit appropriate diagnostics if this returns
783 /// FuncParamNo is expected to be from the user, so is base-1. AttrArgNo is used
784 /// to actually retrieve the argument, so it's base-0.
785 template <typename AttrInfo>
786 static bool checkParamIsIntegerType(Sema &S, const FunctionDecl *FD,
787 const AttrInfo &Attr, Expr *AttrArg,
788 unsigned FuncParamNo, unsigned AttrArgNo,
789 bool AllowDependentType = false) {
791 if (!checkFunctionOrMethodParameterIndex(S, FD, Attr, FuncParamNo, AttrArg,
795 const ParmVarDecl *Param = FD->getParamDecl(Idx);
796 if (AllowDependentType && Param->getType()->isDependentType())
798 if (!Param->getType()->isIntegerType() && !Param->getType()->isCharType()) {
799 SourceLocation SrcLoc = AttrArg->getLocStart();
800 S.Diag(SrcLoc, diag::err_attribute_integers_only)
801 << getAttrName(Attr) << Param->getSourceRange();
807 /// \brief Checks to be sure that the given parameter number is in bounds, and is
808 /// an integral type. Will emit appropriate diagnostics if this returns false.
810 /// FuncParamNo is expected to be from the user, so is base-1. AttrArgNo is used
811 /// to actually retrieve the argument, so it's base-0.
812 static bool checkParamIsIntegerType(Sema &S, const FunctionDecl *FD,
813 const AttributeList &Attr,
814 unsigned FuncParamNo, unsigned AttrArgNo,
815 bool AllowDependentType = false) {
816 assert(Attr.isArgExpr(AttrArgNo) && "Expected expression argument");
817 return checkParamIsIntegerType(S, FD, Attr, Attr.getArgAsExpr(AttrArgNo),
818 FuncParamNo, AttrArgNo, AllowDependentType);
821 static void handleAllocSizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
822 if (!checkAttributeAtLeastNumArgs(S, Attr, 1) ||
823 !checkAttributeAtMostNumArgs(S, Attr, 2))
826 const auto *FD = cast<FunctionDecl>(D);
827 if (!FD->getReturnType()->isPointerType()) {
828 S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
833 const Expr *SizeExpr = Attr.getArgAsExpr(0);
835 // Parameter indices are 1-indexed, hence Index=1
836 if (!checkPositiveIntArgument(S, Attr, SizeExpr, SizeArgNo, /*Index=*/1))
839 if (!checkParamIsIntegerType(S, FD, Attr, SizeArgNo, /*AttrArgNo=*/0))
842 // Args are 1-indexed, so 0 implies that the arg was not present
844 if (Attr.getNumArgs() == 2) {
845 const Expr *NumberExpr = Attr.getArgAsExpr(1);
846 // Parameter indices are 1-based, hence Index=2
847 if (!checkPositiveIntArgument(S, Attr, NumberExpr, NumberArgNo,
851 if (!checkParamIsIntegerType(S, FD, Attr, NumberArgNo, /*AttrArgNo=*/1))
855 D->addAttr(::new (S.Context) AllocSizeAttr(
856 Attr.getRange(), S.Context, SizeArgNo, NumberArgNo,
857 Attr.getAttributeSpellingListIndex()));
860 static bool checkTryLockFunAttrCommon(Sema &S, Decl *D,
861 const AttributeList &Attr,
862 SmallVectorImpl<Expr *> &Args) {
863 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
866 if (!isIntOrBool(Attr.getArgAsExpr(0))) {
867 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
868 << Attr.getName() << 1 << AANT_ArgumentIntOrBool;
872 // check that all arguments are lockable objects
873 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 1);
878 static void handleSharedTrylockFunctionAttr(Sema &S, Decl *D,
879 const AttributeList &Attr) {
880 SmallVector<Expr*, 2> Args;
881 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
884 D->addAttr(::new (S.Context)
885 SharedTrylockFunctionAttr(Attr.getRange(), S.Context,
886 Attr.getArgAsExpr(0),
887 Args.data(), Args.size(),
888 Attr.getAttributeSpellingListIndex()));
891 static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D,
892 const AttributeList &Attr) {
893 SmallVector<Expr*, 2> Args;
894 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
897 D->addAttr(::new (S.Context) ExclusiveTrylockFunctionAttr(
898 Attr.getRange(), S.Context, Attr.getArgAsExpr(0), Args.data(),
899 Args.size(), Attr.getAttributeSpellingListIndex()));
902 static void handleLockReturnedAttr(Sema &S, Decl *D,
903 const AttributeList &Attr) {
904 // check that the argument is lockable object
905 SmallVector<Expr*, 1> Args;
906 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
907 unsigned Size = Args.size();
911 D->addAttr(::new (S.Context)
912 LockReturnedAttr(Attr.getRange(), S.Context, Args[0],
913 Attr.getAttributeSpellingListIndex()));
916 static void handleLocksExcludedAttr(Sema &S, Decl *D,
917 const AttributeList &Attr) {
918 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
921 // check that all arguments are lockable objects
922 SmallVector<Expr*, 1> Args;
923 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
924 unsigned Size = Args.size();
927 Expr **StartArg = &Args[0];
929 D->addAttr(::new (S.Context)
930 LocksExcludedAttr(Attr.getRange(), S.Context, StartArg, Size,
931 Attr.getAttributeSpellingListIndex()));
934 static bool checkFunctionConditionAttr(Sema &S, Decl *D,
935 const AttributeList &Attr,
936 Expr *&Cond, StringRef &Msg) {
937 Cond = Attr.getArgAsExpr(0);
938 if (!Cond->isTypeDependent()) {
939 ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
940 if (Converted.isInvalid())
942 Cond = Converted.get();
945 if (!S.checkStringLiteralArgumentAttr(Attr, 1, Msg))
949 Msg = "<no message provided>";
951 SmallVector<PartialDiagnosticAt, 8> Diags;
952 if (!Cond->isValueDependent() &&
953 !Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(D),
955 S.Diag(Attr.getLoc(), diag::err_attr_cond_never_constant_expr)
957 for (const PartialDiagnosticAt &PDiag : Diags)
958 S.Diag(PDiag.first, PDiag.second);
964 static void handleEnableIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
965 S.Diag(Attr.getLoc(), diag::ext_clang_enable_if);
969 if (checkFunctionConditionAttr(S, D, Attr, Cond, Msg))
970 D->addAttr(::new (S.Context)
971 EnableIfAttr(Attr.getRange(), S.Context, Cond, Msg,
972 Attr.getAttributeSpellingListIndex()));
976 /// Determines if a given Expr references any of the given function's
977 /// ParmVarDecls, or the function's implicit `this` parameter (if applicable).
978 class ArgumentDependenceChecker
979 : public RecursiveASTVisitor<ArgumentDependenceChecker> {
981 const CXXRecordDecl *ClassType;
983 llvm::SmallPtrSet<const ParmVarDecl *, 16> Parms;
987 ArgumentDependenceChecker(const FunctionDecl *FD) {
989 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
990 ClassType = MD->getParent();
994 Parms.insert(FD->param_begin(), FD->param_end());
997 bool referencesArgs(Expr *E) {
1003 bool VisitCXXThisExpr(CXXThisExpr *E) {
1004 assert(E->getType()->getPointeeCXXRecordDecl() == ClassType &&
1005 "`this` doesn't refer to the enclosing class?");
1010 bool VisitDeclRefExpr(DeclRefExpr *DRE) {
1011 if (const auto *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl()))
1012 if (Parms.count(PVD)) {
1021 static void handleDiagnoseIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1022 S.Diag(Attr.getLoc(), diag::ext_clang_diagnose_if);
1026 if (!checkFunctionConditionAttr(S, D, Attr, Cond, Msg))
1029 StringRef DiagTypeStr;
1030 if (!S.checkStringLiteralArgumentAttr(Attr, 2, DiagTypeStr))
1033 DiagnoseIfAttr::DiagnosticType DiagType;
1034 if (!DiagnoseIfAttr::ConvertStrToDiagnosticType(DiagTypeStr, DiagType)) {
1035 S.Diag(Attr.getArgAsExpr(2)->getLocStart(),
1036 diag::err_diagnose_if_invalid_diagnostic_type);
1040 auto *FD = cast<FunctionDecl>(D);
1041 bool ArgDependent = ArgumentDependenceChecker(FD).referencesArgs(Cond);
1042 D->addAttr(::new (S.Context) DiagnoseIfAttr(
1043 Attr.getRange(), S.Context, Cond, Msg, DiagType, ArgDependent, FD,
1044 Attr.getAttributeSpellingListIndex()));
1047 static void handlePassObjectSizeAttr(Sema &S, Decl *D,
1048 const AttributeList &Attr) {
1049 if (D->hasAttr<PassObjectSizeAttr>()) {
1050 S.Diag(D->getLocStart(), diag::err_attribute_only_once_per_parameter)
1055 Expr *E = Attr.getArgAsExpr(0);
1057 if (!checkUInt32Argument(S, Attr, E, Type, /*Idx=*/1))
1060 // pass_object_size's argument is passed in as the second argument of
1061 // __builtin_object_size. So, it has the same constraints as that second
1062 // argument; namely, it must be in the range [0, 3].
1064 S.Diag(E->getLocStart(), diag::err_attribute_argument_outof_range)
1065 << Attr.getName() << 0 << 3 << E->getSourceRange();
1069 // pass_object_size is only supported on constant pointer parameters; as a
1070 // kindness to users, we allow the parameter to be non-const for declarations.
1071 // At this point, we have no clue if `D` belongs to a function declaration or
1072 // definition, so we defer the constness check until later.
1073 if (!cast<ParmVarDecl>(D)->getType()->isPointerType()) {
1074 S.Diag(D->getLocStart(), diag::err_attribute_pointers_only)
1075 << Attr.getName() << 1;
1079 D->addAttr(::new (S.Context)
1080 PassObjectSizeAttr(Attr.getRange(), S.Context, (int)Type,
1081 Attr.getAttributeSpellingListIndex()));
1084 static void handleConsumableAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1085 ConsumableAttr::ConsumedState DefaultState;
1087 if (Attr.isArgIdent(0)) {
1088 IdentifierLoc *IL = Attr.getArgAsIdent(0);
1089 if (!ConsumableAttr::ConvertStrToConsumedState(IL->Ident->getName(),
1091 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
1092 << Attr.getName() << IL->Ident;
1096 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
1097 << Attr.getName() << AANT_ArgumentIdentifier;
1101 D->addAttr(::new (S.Context)
1102 ConsumableAttr(Attr.getRange(), S.Context, DefaultState,
1103 Attr.getAttributeSpellingListIndex()));
1106 static bool checkForConsumableClass(Sema &S, const CXXMethodDecl *MD,
1107 const AttributeList &Attr) {
1108 ASTContext &CurrContext = S.getASTContext();
1109 QualType ThisType = MD->getThisType(CurrContext)->getPointeeType();
1111 if (const CXXRecordDecl *RD = ThisType->getAsCXXRecordDecl()) {
1112 if (!RD->hasAttr<ConsumableAttr>()) {
1113 S.Diag(Attr.getLoc(), diag::warn_attr_on_unconsumable_class) <<
1114 RD->getNameAsString();
1123 static void handleCallableWhenAttr(Sema &S, Decl *D,
1124 const AttributeList &Attr) {
1125 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
1128 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
1131 SmallVector<CallableWhenAttr::ConsumedState, 3> States;
1132 for (unsigned ArgIndex = 0; ArgIndex < Attr.getNumArgs(); ++ArgIndex) {
1133 CallableWhenAttr::ConsumedState CallableState;
1135 StringRef StateString;
1137 if (Attr.isArgIdent(ArgIndex)) {
1138 IdentifierLoc *Ident = Attr.getArgAsIdent(ArgIndex);
1139 StateString = Ident->Ident->getName();
1142 if (!S.checkStringLiteralArgumentAttr(Attr, ArgIndex, StateString, &Loc))
1146 if (!CallableWhenAttr::ConvertStrToConsumedState(StateString,
1148 S.Diag(Loc, diag::warn_attribute_type_not_supported)
1149 << Attr.getName() << StateString;
1153 States.push_back(CallableState);
1156 D->addAttr(::new (S.Context)
1157 CallableWhenAttr(Attr.getRange(), S.Context, States.data(),
1158 States.size(), Attr.getAttributeSpellingListIndex()));
1161 static void handleParamTypestateAttr(Sema &S, Decl *D,
1162 const AttributeList &Attr) {
1163 ParamTypestateAttr::ConsumedState ParamState;
1165 if (Attr.isArgIdent(0)) {
1166 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
1167 StringRef StateString = Ident->Ident->getName();
1169 if (!ParamTypestateAttr::ConvertStrToConsumedState(StateString,
1171 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
1172 << Attr.getName() << StateString;
1176 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
1177 Attr.getName() << AANT_ArgumentIdentifier;
1181 // FIXME: This check is currently being done in the analysis. It can be
1182 // enabled here only after the parser propagates attributes at
1183 // template specialization definition, not declaration.
1184 //QualType ReturnType = cast<ParmVarDecl>(D)->getType();
1185 //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
1187 //if (!RD || !RD->hasAttr<ConsumableAttr>()) {
1188 // S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
1189 // ReturnType.getAsString();
1193 D->addAttr(::new (S.Context)
1194 ParamTypestateAttr(Attr.getRange(), S.Context, ParamState,
1195 Attr.getAttributeSpellingListIndex()));
1198 static void handleReturnTypestateAttr(Sema &S, Decl *D,
1199 const AttributeList &Attr) {
1200 ReturnTypestateAttr::ConsumedState ReturnState;
1202 if (Attr.isArgIdent(0)) {
1203 IdentifierLoc *IL = Attr.getArgAsIdent(0);
1204 if (!ReturnTypestateAttr::ConvertStrToConsumedState(IL->Ident->getName(),
1206 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
1207 << Attr.getName() << IL->Ident;
1211 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
1212 Attr.getName() << AANT_ArgumentIdentifier;
1216 // FIXME: This check is currently being done in the analysis. It can be
1217 // enabled here only after the parser propagates attributes at
1218 // template specialization definition, not declaration.
1219 //QualType ReturnType;
1221 //if (const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D)) {
1222 // ReturnType = Param->getType();
1224 //} else if (const CXXConstructorDecl *Constructor =
1225 // dyn_cast<CXXConstructorDecl>(D)) {
1226 // ReturnType = Constructor->getThisType(S.getASTContext())->getPointeeType();
1230 // ReturnType = cast<FunctionDecl>(D)->getCallResultType();
1233 //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
1235 //if (!RD || !RD->hasAttr<ConsumableAttr>()) {
1236 // S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
1237 // ReturnType.getAsString();
1241 D->addAttr(::new (S.Context)
1242 ReturnTypestateAttr(Attr.getRange(), S.Context, ReturnState,
1243 Attr.getAttributeSpellingListIndex()));
1246 static void handleSetTypestateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1247 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
1250 SetTypestateAttr::ConsumedState NewState;
1251 if (Attr.isArgIdent(0)) {
1252 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
1253 StringRef Param = Ident->Ident->getName();
1254 if (!SetTypestateAttr::ConvertStrToConsumedState(Param, NewState)) {
1255 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
1256 << Attr.getName() << Param;
1260 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
1261 Attr.getName() << AANT_ArgumentIdentifier;
1265 D->addAttr(::new (S.Context)
1266 SetTypestateAttr(Attr.getRange(), S.Context, NewState,
1267 Attr.getAttributeSpellingListIndex()));
1270 static void handleTestTypestateAttr(Sema &S, Decl *D,
1271 const AttributeList &Attr) {
1272 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
1275 TestTypestateAttr::ConsumedState TestState;
1276 if (Attr.isArgIdent(0)) {
1277 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
1278 StringRef Param = Ident->Ident->getName();
1279 if (!TestTypestateAttr::ConvertStrToConsumedState(Param, TestState)) {
1280 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
1281 << Attr.getName() << Param;
1285 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
1286 Attr.getName() << AANT_ArgumentIdentifier;
1290 D->addAttr(::new (S.Context)
1291 TestTypestateAttr(Attr.getRange(), S.Context, TestState,
1292 Attr.getAttributeSpellingListIndex()));
1295 static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D,
1296 const AttributeList &Attr) {
1297 // Remember this typedef decl, we will need it later for diagnostics.
1298 S.ExtVectorDecls.push_back(cast<TypedefNameDecl>(D));
1301 static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1302 if (TagDecl *TD = dyn_cast<TagDecl>(D))
1303 TD->addAttr(::new (S.Context) PackedAttr(Attr.getRange(), S.Context,
1304 Attr.getAttributeSpellingListIndex()));
1305 else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
1306 // Report warning about changed offset in the newer compiler versions.
1307 if (!FD->getType()->isDependentType() &&
1308 !FD->getType()->isIncompleteType() && FD->isBitField() &&
1309 S.Context.getTypeAlign(FD->getType()) <= 8)
1310 S.Diag(Attr.getLoc(), diag::warn_attribute_packed_for_bitfield);
1312 FD->addAttr(::new (S.Context) PackedAttr(
1313 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
1315 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1318 static bool checkIBOutletCommon(Sema &S, Decl *D, const AttributeList &Attr) {
1319 // The IBOutlet/IBOutletCollection attributes only apply to instance
1320 // variables or properties of Objective-C classes. The outlet must also
1321 // have an object reference type.
1322 if (const ObjCIvarDecl *VD = dyn_cast<ObjCIvarDecl>(D)) {
1323 if (!VD->getType()->getAs<ObjCObjectPointerType>()) {
1324 S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
1325 << Attr.getName() << VD->getType() << 0;
1329 else if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
1330 if (!PD->getType()->getAs<ObjCObjectPointerType>()) {
1331 S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
1332 << Attr.getName() << PD->getType() << 1;
1337 S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName();
1344 static void handleIBOutlet(Sema &S, Decl *D, const AttributeList &Attr) {
1345 if (!checkIBOutletCommon(S, D, Attr))
1348 D->addAttr(::new (S.Context)
1349 IBOutletAttr(Attr.getRange(), S.Context,
1350 Attr.getAttributeSpellingListIndex()));
1353 static void handleIBOutletCollection(Sema &S, Decl *D,
1354 const AttributeList &Attr) {
1356 // The iboutletcollection attribute can have zero or one arguments.
1357 if (Attr.getNumArgs() > 1) {
1358 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
1359 << Attr.getName() << 1;
1363 if (!checkIBOutletCommon(S, D, Attr))
1368 if (Attr.hasParsedType())
1369 PT = Attr.getTypeArg();
1371 PT = S.getTypeName(S.Context.Idents.get("NSObject"), Attr.getLoc(),
1372 S.getScopeForContext(D->getDeclContext()->getParent()));
1374 S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << "NSObject";
1379 TypeSourceInfo *QTLoc = nullptr;
1380 QualType QT = S.GetTypeFromParser(PT, &QTLoc);
1382 QTLoc = S.Context.getTrivialTypeSourceInfo(QT, Attr.getLoc());
1384 // Diagnose use of non-object type in iboutletcollection attribute.
1385 // FIXME. Gnu attribute extension ignores use of builtin types in
1386 // attributes. So, __attribute__((iboutletcollection(char))) will be
1387 // treated as __attribute__((iboutletcollection())).
1388 if (!QT->isObjCIdType() && !QT->isObjCObjectType()) {
1389 S.Diag(Attr.getLoc(),
1390 QT->isBuiltinType() ? diag::err_iboutletcollection_builtintype
1391 : diag::err_iboutletcollection_type) << QT;
1395 D->addAttr(::new (S.Context)
1396 IBOutletCollectionAttr(Attr.getRange(), S.Context, QTLoc,
1397 Attr.getAttributeSpellingListIndex()));
1400 bool Sema::isValidPointerAttrType(QualType T, bool RefOkay) {
1402 if (T->isReferenceType())
1405 T = T.getNonReferenceType();
1408 // The nonnull attribute, and other similar attributes, can be applied to a
1409 // transparent union that contains a pointer type.
1410 if (const RecordType *UT = T->getAsUnionType()) {
1411 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) {
1412 RecordDecl *UD = UT->getDecl();
1413 for (const auto *I : UD->fields()) {
1414 QualType QT = I->getType();
1415 if (QT->isAnyPointerType() || QT->isBlockPointerType())
1421 return T->isAnyPointerType() || T->isBlockPointerType();
1424 static bool attrNonNullArgCheck(Sema &S, QualType T, const AttributeList &Attr,
1425 SourceRange AttrParmRange,
1426 SourceRange TypeRange,
1427 bool isReturnValue = false) {
1428 if (!S.isValidPointerAttrType(T)) {
1430 S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
1431 << Attr.getName() << AttrParmRange << TypeRange;
1433 S.Diag(Attr.getLoc(), diag::warn_attribute_pointers_only)
1434 << Attr.getName() << AttrParmRange << TypeRange << 0;
1440 static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1441 SmallVector<unsigned, 8> NonNullArgs;
1442 for (unsigned I = 0; I < Attr.getNumArgs(); ++I) {
1443 Expr *Ex = Attr.getArgAsExpr(I);
1445 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, I + 1, Ex, Idx))
1448 // Is the function argument a pointer type?
1449 if (Idx < getFunctionOrMethodNumParams(D) &&
1450 !attrNonNullArgCheck(S, getFunctionOrMethodParamType(D, Idx), Attr,
1451 Ex->getSourceRange(),
1452 getFunctionOrMethodParamRange(D, Idx)))
1455 NonNullArgs.push_back(Idx);
1458 // If no arguments were specified to __attribute__((nonnull)) then all pointer
1459 // arguments have a nonnull attribute; warn if there aren't any. Skip this
1460 // check if the attribute came from a macro expansion or a template
1462 if (NonNullArgs.empty() && Attr.getLoc().isFileID() &&
1463 !S.inTemplateInstantiation()) {
1464 bool AnyPointers = isFunctionOrMethodVariadic(D);
1465 for (unsigned I = 0, E = getFunctionOrMethodNumParams(D);
1466 I != E && !AnyPointers; ++I) {
1467 QualType T = getFunctionOrMethodParamType(D, I);
1468 if (T->isDependentType() || S.isValidPointerAttrType(T))
1473 S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers);
1476 unsigned *Start = NonNullArgs.data();
1477 unsigned Size = NonNullArgs.size();
1478 llvm::array_pod_sort(Start, Start + Size);
1479 D->addAttr(::new (S.Context)
1480 NonNullAttr(Attr.getRange(), S.Context, Start, Size,
1481 Attr.getAttributeSpellingListIndex()));
1484 static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
1485 const AttributeList &Attr) {
1486 if (Attr.getNumArgs() > 0) {
1487 if (D->getFunctionType()) {
1488 handleNonNullAttr(S, D, Attr);
1490 S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_parm_no_args)
1491 << D->getSourceRange();
1496 // Is the argument a pointer type?
1497 if (!attrNonNullArgCheck(S, D->getType(), Attr, SourceRange(),
1498 D->getSourceRange()))
1501 D->addAttr(::new (S.Context)
1502 NonNullAttr(Attr.getRange(), S.Context, nullptr, 0,
1503 Attr.getAttributeSpellingListIndex()));
1506 static void handleReturnsNonNullAttr(Sema &S, Decl *D,
1507 const AttributeList &Attr) {
1508 QualType ResultType = getFunctionOrMethodResultType(D);
1509 SourceRange SR = getFunctionOrMethodResultSourceRange(D);
1510 if (!attrNonNullArgCheck(S, ResultType, Attr, SourceRange(), SR,
1511 /* isReturnValue */ true))
1514 D->addAttr(::new (S.Context)
1515 ReturnsNonNullAttr(Attr.getRange(), S.Context,
1516 Attr.getAttributeSpellingListIndex()));
1519 static void handleAssumeAlignedAttr(Sema &S, Decl *D,
1520 const AttributeList &Attr) {
1521 Expr *E = Attr.getArgAsExpr(0),
1522 *OE = Attr.getNumArgs() > 1 ? Attr.getArgAsExpr(1) : nullptr;
1523 S.AddAssumeAlignedAttr(Attr.getRange(), D, E, OE,
1524 Attr.getAttributeSpellingListIndex());
1527 static void handleAllocAlignAttr(Sema &S, Decl *D,
1528 const AttributeList &Attr) {
1529 S.AddAllocAlignAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
1530 Attr.getAttributeSpellingListIndex());
1533 void Sema::AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
1534 Expr *OE, unsigned SpellingListIndex) {
1535 QualType ResultType = getFunctionOrMethodResultType(D);
1536 SourceRange SR = getFunctionOrMethodResultSourceRange(D);
1538 AssumeAlignedAttr TmpAttr(AttrRange, Context, E, OE, SpellingListIndex);
1539 SourceLocation AttrLoc = AttrRange.getBegin();
1541 if (!isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
1542 Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
1543 << &TmpAttr << AttrRange << SR;
1547 if (!E->isValueDependent()) {
1549 if (!E->isIntegerConstantExpr(I, Context)) {
1551 Diag(AttrLoc, diag::err_attribute_argument_n_type)
1552 << &TmpAttr << 1 << AANT_ArgumentIntegerConstant
1553 << E->getSourceRange();
1555 Diag(AttrLoc, diag::err_attribute_argument_type)
1556 << &TmpAttr << AANT_ArgumentIntegerConstant
1557 << E->getSourceRange();
1561 if (!I.isPowerOf2()) {
1562 Diag(AttrLoc, diag::err_alignment_not_power_of_two)
1563 << E->getSourceRange();
1569 if (!OE->isValueDependent()) {
1571 if (!OE->isIntegerConstantExpr(I, Context)) {
1572 Diag(AttrLoc, diag::err_attribute_argument_n_type)
1573 << &TmpAttr << 2 << AANT_ArgumentIntegerConstant
1574 << OE->getSourceRange();
1580 D->addAttr(::new (Context)
1581 AssumeAlignedAttr(AttrRange, Context, E, OE, SpellingListIndex));
1584 void Sema::AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
1585 unsigned SpellingListIndex) {
1586 QualType ResultType = getFunctionOrMethodResultType(D);
1588 AllocAlignAttr TmpAttr(AttrRange, Context, 0, SpellingListIndex);
1589 SourceLocation AttrLoc = AttrRange.getBegin();
1591 if (!ResultType->isDependentType() &&
1592 !isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
1593 Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
1594 << &TmpAttr << AttrRange << getFunctionOrMethodResultSourceRange(D);
1599 const auto *FuncDecl = cast<FunctionDecl>(D);
1600 if (!checkFunctionOrMethodParameterIndex(*this, FuncDecl, TmpAttr,
1601 /*AttrArgNo=*/1, ParamExpr,
1605 QualType Ty = getFunctionOrMethodParamType(D, IndexVal);
1606 if (!Ty->isDependentType() && !Ty->isIntegralType(Context)) {
1607 Diag(ParamExpr->getLocStart(), diag::err_attribute_integers_only)
1608 << &TmpAttr << FuncDecl->getParamDecl(IndexVal)->getSourceRange();
1612 // We cannot use the Idx returned from checkFunctionOrMethodParameterIndex
1613 // because that has corrected for the implicit this parameter, and is zero-
1614 // based. The attribute expects what the user wrote explicitly.
1616 ParamExpr->EvaluateAsInt(Val, Context);
1618 D->addAttr(::new (Context) AllocAlignAttr(
1619 AttrRange, Context, Val.getZExtValue(), SpellingListIndex));
1622 /// Normalize the attribute, __foo__ becomes foo.
1623 /// Returns true if normalization was applied.
1624 static bool normalizeName(StringRef &AttrName) {
1625 if (AttrName.size() > 4 && AttrName.startswith("__") &&
1626 AttrName.endswith("__")) {
1627 AttrName = AttrName.drop_front(2).drop_back(2);
1633 static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
1634 // This attribute must be applied to a function declaration. The first
1635 // argument to the attribute must be an identifier, the name of the resource,
1636 // for example: malloc. The following arguments must be argument indexes, the
1637 // arguments must be of integer type for Returns, otherwise of pointer type.
1638 // The difference between Holds and Takes is that a pointer may still be used
1639 // after being held. free() should be __attribute((ownership_takes)), whereas
1640 // a list append function may well be __attribute((ownership_holds)).
1642 if (!AL.isArgIdent(0)) {
1643 S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
1644 << AL.getName() << 1 << AANT_ArgumentIdentifier;
1648 // Figure out our Kind.
1649 OwnershipAttr::OwnershipKind K =
1650 OwnershipAttr(AL.getLoc(), S.Context, nullptr, nullptr, 0,
1651 AL.getAttributeSpellingListIndex()).getOwnKind();
1655 case OwnershipAttr::Takes:
1656 case OwnershipAttr::Holds:
1657 if (AL.getNumArgs() < 2) {
1658 S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments)
1659 << AL.getName() << 2;
1663 case OwnershipAttr::Returns:
1664 if (AL.getNumArgs() > 2) {
1665 S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments)
1666 << AL.getName() << 1;
1672 IdentifierInfo *Module = AL.getArgAsIdent(0)->Ident;
1674 StringRef ModuleName = Module->getName();
1675 if (normalizeName(ModuleName)) {
1676 Module = &S.PP.getIdentifierTable().get(ModuleName);
1679 SmallVector<unsigned, 8> OwnershipArgs;
1680 for (unsigned i = 1; i < AL.getNumArgs(); ++i) {
1681 Expr *Ex = AL.getArgAsExpr(i);
1683 if (!checkFunctionOrMethodParameterIndex(S, D, AL, i, Ex, Idx))
1686 // Is the function argument a pointer type?
1687 QualType T = getFunctionOrMethodParamType(D, Idx);
1688 int Err = -1; // No error
1690 case OwnershipAttr::Takes:
1691 case OwnershipAttr::Holds:
1692 if (!T->isAnyPointerType() && !T->isBlockPointerType())
1695 case OwnershipAttr::Returns:
1696 if (!T->isIntegerType())
1701 S.Diag(AL.getLoc(), diag::err_ownership_type) << AL.getName() << Err
1702 << Ex->getSourceRange();
1706 // Check we don't have a conflict with another ownership attribute.
1707 for (const auto *I : D->specific_attrs<OwnershipAttr>()) {
1708 // Cannot have two ownership attributes of different kinds for the same
1710 if (I->getOwnKind() != K && I->args_end() !=
1711 std::find(I->args_begin(), I->args_end(), Idx)) {
1712 S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
1713 << AL.getName() << I;
1715 } else if (K == OwnershipAttr::Returns &&
1716 I->getOwnKind() == OwnershipAttr::Returns) {
1717 // A returns attribute conflicts with any other returns attribute using
1718 // a different index. Note, diagnostic reporting is 1-based, but stored
1719 // argument indexes are 0-based.
1720 if (std::find(I->args_begin(), I->args_end(), Idx) == I->args_end()) {
1721 S.Diag(I->getLocation(), diag::err_ownership_returns_index_mismatch)
1722 << *(I->args_begin()) + 1;
1724 S.Diag(AL.getLoc(), diag::note_ownership_returns_index_mismatch)
1725 << (unsigned)Idx + 1 << Ex->getSourceRange();
1730 OwnershipArgs.push_back(Idx);
1733 unsigned* start = OwnershipArgs.data();
1734 unsigned size = OwnershipArgs.size();
1735 llvm::array_pod_sort(start, start + size);
1737 D->addAttr(::new (S.Context)
1738 OwnershipAttr(AL.getLoc(), S.Context, Module, start, size,
1739 AL.getAttributeSpellingListIndex()));
1742 static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1743 // Check the attribute arguments.
1744 if (Attr.getNumArgs() > 1) {
1745 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
1746 << Attr.getName() << 1;
1750 NamedDecl *nd = cast<NamedDecl>(D);
1754 // static int a __attribute__((weakref ("v2")));
1755 // static int b() __attribute__((weakref ("f3")));
1757 // and ignores the attributes of
1759 // static int a __attribute__((weakref ("v2")));
1762 const DeclContext *Ctx = D->getDeclContext()->getRedeclContext();
1763 if (!Ctx->isFileContext()) {
1764 S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_global_context)
1769 // The GCC manual says
1771 // At present, a declaration to which `weakref' is attached can only
1776 // Without a TARGET,
1777 // given as an argument to `weakref' or to `alias', `weakref' is
1778 // equivalent to `weak'.
1780 // gcc 4.4.1 will accept
1781 // int a7 __attribute__((weakref));
1783 // int a7 __attribute__((weak));
1784 // This looks like a bug in gcc. We reject that for now. We should revisit
1785 // it if this behaviour is actually used.
1788 // static ((alias ("y"), weakref)).
1789 // Should we? How to check that weakref is before or after alias?
1791 // FIXME: it would be good for us to keep the WeakRefAttr as-written instead
1792 // of transforming it into an AliasAttr. The WeakRefAttr never uses the
1793 // StringRef parameter it was given anyway.
1795 if (Attr.getNumArgs() && S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1796 // GCC will accept anything as the argument of weakref. Should we
1797 // check for an existing decl?
1798 D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
1799 Attr.getAttributeSpellingListIndex()));
1801 D->addAttr(::new (S.Context)
1802 WeakRefAttr(Attr.getRange(), S.Context,
1803 Attr.getAttributeSpellingListIndex()));
1806 static void handleIFuncAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1808 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1811 // Aliases should be on declarations, not definitions.
1812 const auto *FD = cast<FunctionDecl>(D);
1813 if (FD->isThisDeclarationADefinition()) {
1814 S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << FD << 1;
1817 // FIXME: it should be handled as a target specific attribute.
1818 if (S.Context.getTargetInfo().getTriple().getObjectFormat() !=
1819 llvm::Triple::ELF) {
1820 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1824 D->addAttr(::new (S.Context) IFuncAttr(Attr.getRange(), S.Context, Str,
1825 Attr.getAttributeSpellingListIndex()));
1828 static void handleAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1830 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1833 if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
1834 S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_darwin);
1837 if (S.Context.getTargetInfo().getTriple().isNVPTX()) {
1838 S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_nvptx);
1841 // Aliases should be on declarations, not definitions.
1842 if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
1843 if (FD->isThisDeclarationADefinition()) {
1844 S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << FD << 0;
1848 const auto *VD = cast<VarDecl>(D);
1849 if (VD->isThisDeclarationADefinition() && VD->isExternallyVisible()) {
1850 S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << VD << 0;
1855 // FIXME: check if target symbol exists in current file
1857 D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
1858 Attr.getAttributeSpellingListIndex()));
1861 static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1862 if (checkAttrMutualExclusion<HotAttr>(S, D, Attr.getRange(), Attr.getName()))
1865 D->addAttr(::new (S.Context) ColdAttr(Attr.getRange(), S.Context,
1866 Attr.getAttributeSpellingListIndex()));
1869 static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1870 if (checkAttrMutualExclusion<ColdAttr>(S, D, Attr.getRange(), Attr.getName()))
1873 D->addAttr(::new (S.Context) HotAttr(Attr.getRange(), S.Context,
1874 Attr.getAttributeSpellingListIndex()));
1877 static void handleTLSModelAttr(Sema &S, Decl *D,
1878 const AttributeList &Attr) {
1880 SourceLocation LiteralLoc;
1881 // Check that it is a string.
1882 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Model, &LiteralLoc))
1885 // Check that the value.
1886 if (Model != "global-dynamic" && Model != "local-dynamic"
1887 && Model != "initial-exec" && Model != "local-exec") {
1888 S.Diag(LiteralLoc, diag::err_attr_tlsmodel_arg);
1892 D->addAttr(::new (S.Context)
1893 TLSModelAttr(Attr.getRange(), S.Context, Model,
1894 Attr.getAttributeSpellingListIndex()));
1897 static void handleRestrictAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1898 QualType ResultType = getFunctionOrMethodResultType(D);
1899 if (ResultType->isAnyPointerType() || ResultType->isBlockPointerType()) {
1900 D->addAttr(::new (S.Context) RestrictAttr(
1901 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
1905 S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
1906 << Attr.getName() << getFunctionOrMethodResultSourceRange(D);
1909 static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1910 if (S.LangOpts.CPlusPlus) {
1911 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
1912 << Attr.getName() << AttributeLangSupport::Cpp;
1916 if (CommonAttr *CA = S.mergeCommonAttr(D, Attr.getRange(), Attr.getName(),
1917 Attr.getAttributeSpellingListIndex()))
1921 static void handleNakedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1922 if (checkAttrMutualExclusion<DisableTailCallsAttr>(S, D, Attr.getRange(),
1926 if (Attr.isDeclspecAttribute()) {
1927 const auto &Triple = S.getASTContext().getTargetInfo().getTriple();
1928 const auto &Arch = Triple.getArch();
1929 if (Arch != llvm::Triple::x86 &&
1930 (Arch != llvm::Triple::arm && Arch != llvm::Triple::thumb)) {
1931 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_on_arch)
1932 << Attr.getName() << Triple.getArchName();
1937 D->addAttr(::new (S.Context) NakedAttr(Attr.getRange(), S.Context,
1938 Attr.getAttributeSpellingListIndex()));
1941 static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &attr) {
1942 if (hasDeclarator(D)) return;
1944 if (S.CheckNoReturnAttr(attr))
1947 if (!isa<ObjCMethodDecl>(D)) {
1948 S.Diag(attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1949 << attr.getName() << ExpectedFunctionOrMethod;
1953 D->addAttr(::new (S.Context) NoReturnAttr(
1954 attr.getRange(), S.Context, attr.getAttributeSpellingListIndex()));
1957 static void handleNoCallerSavedRegsAttr(Sema &S, Decl *D,
1958 const AttributeList &Attr) {
1959 if (S.CheckNoCallerSavedRegsAttr(Attr))
1962 D->addAttr(::new (S.Context) AnyX86NoCallerSavedRegistersAttr(
1963 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
1966 bool Sema::CheckNoReturnAttr(const AttributeList &attr) {
1967 if (!checkAttributeNumArgs(*this, attr, 0)) {
1975 bool Sema::CheckNoCallerSavedRegsAttr(const AttributeList &Attr) {
1976 // Check whether the attribute is valid on the current target.
1977 if (!Attr.existsInTarget(Context.getTargetInfo())) {
1978 Diag(Attr.getLoc(), diag::warn_unknown_attribute_ignored) << Attr.getName();
1983 if (!checkAttributeNumArgs(*this, Attr, 0)) {
1991 static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D,
1992 const AttributeList &Attr) {
1994 // The checking path for 'noreturn' and 'analyzer_noreturn' are different
1995 // because 'analyzer_noreturn' does not impact the type.
1996 if (!isFunctionOrMethodOrBlock(D)) {
1997 ValueDecl *VD = dyn_cast<ValueDecl>(D);
1998 if (!VD || (!VD->getType()->isBlockPointerType() &&
1999 !VD->getType()->isFunctionPointerType())) {
2000 S.Diag(Attr.getLoc(),
2001 Attr.isCXX11Attribute() ? diag::err_attribute_wrong_decl_type
2002 : diag::warn_attribute_wrong_decl_type)
2003 << Attr.getName() << ExpectedFunctionMethodOrBlock;
2008 D->addAttr(::new (S.Context)
2009 AnalyzerNoReturnAttr(Attr.getRange(), S.Context,
2010 Attr.getAttributeSpellingListIndex()));
2013 // PS3 PPU-specific.
2014 static void handleVecReturnAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2016 Returning a Vector Class in Registers
2018 According to the PPU ABI specifications, a class with a single member of
2019 vector type is returned in memory when used as the return value of a function.
2020 This results in inefficient code when implementing vector classes. To return
2021 the value in a single vector register, add the vecreturn attribute to the
2022 class definition. This attribute is also applicable to struct types.
2028 __vector float xyzw;
2029 } __attribute__((vecreturn));
2031 Vector Add(Vector lhs, Vector rhs)
2034 result.xyzw = vec_add(lhs.xyzw, rhs.xyzw);
2035 return result; // This will be returned in a register
2038 if (VecReturnAttr *A = D->getAttr<VecReturnAttr>()) {
2039 S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << A;
2043 RecordDecl *record = cast<RecordDecl>(D);
2046 if (!isa<CXXRecordDecl>(record)) {
2047 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
2051 if (!cast<CXXRecordDecl>(record)->isPOD()) {
2052 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_pod_record);
2056 for (const auto *I : record->fields()) {
2057 if ((count == 1) || !I->getType()->isVectorType()) {
2058 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
2064 D->addAttr(::new (S.Context)
2065 VecReturnAttr(Attr.getRange(), S.Context,
2066 Attr.getAttributeSpellingListIndex()));
2069 static void handleDependencyAttr(Sema &S, Scope *Scope, Decl *D,
2070 const AttributeList &Attr) {
2071 if (isa<ParmVarDecl>(D)) {
2072 // [[carries_dependency]] can only be applied to a parameter if it is a
2073 // parameter of a function declaration or lambda.
2074 if (!(Scope->getFlags() & clang::Scope::FunctionDeclarationScope)) {
2075 S.Diag(Attr.getLoc(),
2076 diag::err_carries_dependency_param_not_function_decl);
2081 D->addAttr(::new (S.Context) CarriesDependencyAttr(
2082 Attr.getRange(), S.Context,
2083 Attr.getAttributeSpellingListIndex()));
2086 static void handleNotTailCalledAttr(Sema &S, Decl *D,
2087 const AttributeList &Attr) {
2088 if (checkAttrMutualExclusion<AlwaysInlineAttr>(S, D, Attr.getRange(),
2092 D->addAttr(::new (S.Context) NotTailCalledAttr(
2093 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
2096 static void handleDisableTailCallsAttr(Sema &S, Decl *D,
2097 const AttributeList &Attr) {
2098 if (checkAttrMutualExclusion<NakedAttr>(S, D, Attr.getRange(),
2102 D->addAttr(::new (S.Context) DisableTailCallsAttr(
2103 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
2106 static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2107 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
2108 if (VD->hasLocalStorage()) {
2109 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
2112 } else if (!isFunctionOrMethod(D)) {
2113 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2114 << Attr.getName() << ExpectedVariableOrFunction;
2118 D->addAttr(::new (S.Context)
2119 UsedAttr(Attr.getRange(), S.Context,
2120 Attr.getAttributeSpellingListIndex()));
2123 static void handleUnusedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2124 bool IsCXX1zAttr = Attr.isCXX11Attribute() && !Attr.getScopeName();
2126 if (IsCXX1zAttr && isa<VarDecl>(D)) {
2127 // The C++1z spelling of this attribute cannot be applied to a static data
2128 // member per [dcl.attr.unused]p2.
2129 if (cast<VarDecl>(D)->isStaticDataMember()) {
2130 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2131 << Attr.getName() << ExpectedForMaybeUnused;
2136 // If this is spelled as the standard C++1z attribute, but not in C++1z, warn
2137 // about using it as an extension.
2138 if (!S.getLangOpts().CPlusPlus1z && IsCXX1zAttr)
2139 S.Diag(Attr.getLoc(), diag::ext_cxx1z_attr) << Attr.getName();
2141 D->addAttr(::new (S.Context) UnusedAttr(
2142 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
2145 static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2146 uint32_t priority = ConstructorAttr::DefaultPriority;
2147 if (Attr.getNumArgs() &&
2148 !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
2151 D->addAttr(::new (S.Context)
2152 ConstructorAttr(Attr.getRange(), S.Context, priority,
2153 Attr.getAttributeSpellingListIndex()));
2156 static void handleDestructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2157 uint32_t priority = DestructorAttr::DefaultPriority;
2158 if (Attr.getNumArgs() &&
2159 !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
2162 D->addAttr(::new (S.Context)
2163 DestructorAttr(Attr.getRange(), S.Context, priority,
2164 Attr.getAttributeSpellingListIndex()));
2167 template <typename AttrTy>
2168 static void handleAttrWithMessage(Sema &S, Decl *D,
2169 const AttributeList &Attr) {
2170 // Handle the case where the attribute has a text message.
2172 if (Attr.getNumArgs() == 1 && !S.checkStringLiteralArgumentAttr(Attr, 0, Str))
2175 D->addAttr(::new (S.Context) AttrTy(Attr.getRange(), S.Context, Str,
2176 Attr.getAttributeSpellingListIndex()));
2179 static void handleObjCSuppresProtocolAttr(Sema &S, Decl *D,
2180 const AttributeList &Attr) {
2181 if (!cast<ObjCProtocolDecl>(D)->isThisDeclarationADefinition()) {
2182 S.Diag(Attr.getLoc(), diag::err_objc_attr_protocol_requires_definition)
2183 << Attr.getName() << Attr.getRange();
2187 D->addAttr(::new (S.Context)
2188 ObjCExplicitProtocolImplAttr(Attr.getRange(), S.Context,
2189 Attr.getAttributeSpellingListIndex()));
2192 static bool checkAvailabilityAttr(Sema &S, SourceRange Range,
2193 IdentifierInfo *Platform,
2194 VersionTuple Introduced,
2195 VersionTuple Deprecated,
2196 VersionTuple Obsoleted) {
2197 StringRef PlatformName
2198 = AvailabilityAttr::getPrettyPlatformName(Platform->getName());
2199 if (PlatformName.empty())
2200 PlatformName = Platform->getName();
2202 // Ensure that Introduced <= Deprecated <= Obsoleted (although not all
2203 // of these steps are needed).
2204 if (!Introduced.empty() && !Deprecated.empty() &&
2205 !(Introduced <= Deprecated)) {
2206 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
2207 << 1 << PlatformName << Deprecated.getAsString()
2208 << 0 << Introduced.getAsString();
2212 if (!Introduced.empty() && !Obsoleted.empty() &&
2213 !(Introduced <= Obsoleted)) {
2214 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
2215 << 2 << PlatformName << Obsoleted.getAsString()
2216 << 0 << Introduced.getAsString();
2220 if (!Deprecated.empty() && !Obsoleted.empty() &&
2221 !(Deprecated <= Obsoleted)) {
2222 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
2223 << 2 << PlatformName << Obsoleted.getAsString()
2224 << 1 << Deprecated.getAsString();
2231 /// \brief Check whether the two versions match.
2233 /// If either version tuple is empty, then they are assumed to match. If
2234 /// \p BeforeIsOkay is true, then \p X can be less than or equal to \p Y.
2235 static bool versionsMatch(const VersionTuple &X, const VersionTuple &Y,
2236 bool BeforeIsOkay) {
2237 if (X.empty() || Y.empty())
2243 if (BeforeIsOkay && X < Y)
2249 AvailabilityAttr *Sema::mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
2250 IdentifierInfo *Platform,
2252 VersionTuple Introduced,
2253 VersionTuple Deprecated,
2254 VersionTuple Obsoleted,
2258 StringRef Replacement,
2259 AvailabilityMergeKind AMK,
2260 unsigned AttrSpellingListIndex) {
2261 VersionTuple MergedIntroduced = Introduced;
2262 VersionTuple MergedDeprecated = Deprecated;
2263 VersionTuple MergedObsoleted = Obsoleted;
2264 bool FoundAny = false;
2265 bool OverrideOrImpl = false;
2268 case AMK_Redeclaration:
2269 OverrideOrImpl = false;
2273 case AMK_ProtocolImplementation:
2274 OverrideOrImpl = true;
2278 if (D->hasAttrs()) {
2279 AttrVec &Attrs = D->getAttrs();
2280 for (unsigned i = 0, e = Attrs.size(); i != e;) {
2281 const AvailabilityAttr *OldAA = dyn_cast<AvailabilityAttr>(Attrs[i]);
2287 IdentifierInfo *OldPlatform = OldAA->getPlatform();
2288 if (OldPlatform != Platform) {
2293 // If there is an existing availability attribute for this platform that
2294 // is explicit and the new one is implicit use the explicit one and
2295 // discard the new implicit attribute.
2296 if (!OldAA->isImplicit() && Implicit) {
2300 // If there is an existing attribute for this platform that is implicit
2301 // and the new attribute is explicit then erase the old one and
2302 // continue processing the attributes.
2303 if (!Implicit && OldAA->isImplicit()) {
2304 Attrs.erase(Attrs.begin() + i);
2310 VersionTuple OldIntroduced = OldAA->getIntroduced();
2311 VersionTuple OldDeprecated = OldAA->getDeprecated();
2312 VersionTuple OldObsoleted = OldAA->getObsoleted();
2313 bool OldIsUnavailable = OldAA->getUnavailable();
2315 if (!versionsMatch(OldIntroduced, Introduced, OverrideOrImpl) ||
2316 !versionsMatch(Deprecated, OldDeprecated, OverrideOrImpl) ||
2317 !versionsMatch(Obsoleted, OldObsoleted, OverrideOrImpl) ||
2318 !(OldIsUnavailable == IsUnavailable ||
2319 (OverrideOrImpl && !OldIsUnavailable && IsUnavailable))) {
2320 if (OverrideOrImpl) {
2322 VersionTuple FirstVersion;
2323 VersionTuple SecondVersion;
2324 if (!versionsMatch(OldIntroduced, Introduced, OverrideOrImpl)) {
2326 FirstVersion = OldIntroduced;
2327 SecondVersion = Introduced;
2328 } else if (!versionsMatch(Deprecated, OldDeprecated, OverrideOrImpl)) {
2330 FirstVersion = Deprecated;
2331 SecondVersion = OldDeprecated;
2332 } else if (!versionsMatch(Obsoleted, OldObsoleted, OverrideOrImpl)) {
2334 FirstVersion = Obsoleted;
2335 SecondVersion = OldObsoleted;
2339 Diag(OldAA->getLocation(),
2340 diag::warn_mismatched_availability_override_unavail)
2341 << AvailabilityAttr::getPrettyPlatformName(Platform->getName())
2342 << (AMK == AMK_Override);
2344 Diag(OldAA->getLocation(),
2345 diag::warn_mismatched_availability_override)
2347 << AvailabilityAttr::getPrettyPlatformName(Platform->getName())
2348 << FirstVersion.getAsString() << SecondVersion.getAsString()
2349 << (AMK == AMK_Override);
2351 if (AMK == AMK_Override)
2352 Diag(Range.getBegin(), diag::note_overridden_method);
2354 Diag(Range.getBegin(), diag::note_protocol_method);
2356 Diag(OldAA->getLocation(), diag::warn_mismatched_availability);
2357 Diag(Range.getBegin(), diag::note_previous_attribute);
2360 Attrs.erase(Attrs.begin() + i);
2365 VersionTuple MergedIntroduced2 = MergedIntroduced;
2366 VersionTuple MergedDeprecated2 = MergedDeprecated;
2367 VersionTuple MergedObsoleted2 = MergedObsoleted;
2369 if (MergedIntroduced2.empty())
2370 MergedIntroduced2 = OldIntroduced;
2371 if (MergedDeprecated2.empty())
2372 MergedDeprecated2 = OldDeprecated;
2373 if (MergedObsoleted2.empty())
2374 MergedObsoleted2 = OldObsoleted;
2376 if (checkAvailabilityAttr(*this, OldAA->getRange(), Platform,
2377 MergedIntroduced2, MergedDeprecated2,
2378 MergedObsoleted2)) {
2379 Attrs.erase(Attrs.begin() + i);
2384 MergedIntroduced = MergedIntroduced2;
2385 MergedDeprecated = MergedDeprecated2;
2386 MergedObsoleted = MergedObsoleted2;
2392 MergedIntroduced == Introduced &&
2393 MergedDeprecated == Deprecated &&
2394 MergedObsoleted == Obsoleted)
2397 // Only create a new attribute if !OverrideOrImpl, but we want to do
2399 if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
2400 MergedDeprecated, MergedObsoleted) &&
2402 auto *Avail = ::new (Context) AvailabilityAttr(Range, Context, Platform,
2403 Introduced, Deprecated,
2404 Obsoleted, IsUnavailable, Message,
2405 IsStrict, Replacement,
2406 AttrSpellingListIndex);
2407 Avail->setImplicit(Implicit);
2413 static void handleAvailabilityAttr(Sema &S, Decl *D,
2414 const AttributeList &Attr) {
2415 if (!checkAttributeNumArgs(S, Attr, 1))
2417 IdentifierLoc *Platform = Attr.getArgAsIdent(0);
2418 unsigned Index = Attr.getAttributeSpellingListIndex();
2420 IdentifierInfo *II = Platform->Ident;
2421 if (AvailabilityAttr::getPrettyPlatformName(II->getName()).empty())
2422 S.Diag(Platform->Loc, diag::warn_availability_unknown_platform)
2425 NamedDecl *ND = dyn_cast<NamedDecl>(D);
2426 if (!ND) // We warned about this already, so just return.
2429 AvailabilityChange Introduced = Attr.getAvailabilityIntroduced();
2430 AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated();
2431 AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted();
2432 bool IsUnavailable = Attr.getUnavailableLoc().isValid();
2433 bool IsStrict = Attr.getStrictLoc().isValid();
2435 if (const StringLiteral *SE =
2436 dyn_cast_or_null<StringLiteral>(Attr.getMessageExpr()))
2437 Str = SE->getString();
2438 StringRef Replacement;
2439 if (const StringLiteral *SE =
2440 dyn_cast_or_null<StringLiteral>(Attr.getReplacementExpr()))
2441 Replacement = SE->getString();
2443 AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND, Attr.getRange(), II,
2449 IsStrict, Replacement,
2453 D->addAttr(NewAttr);
2455 // Transcribe "ios" to "watchos" (and add a new attribute) if the versioning
2456 // matches before the start of the watchOS platform.
2457 if (S.Context.getTargetInfo().getTriple().isWatchOS()) {
2458 IdentifierInfo *NewII = nullptr;
2459 if (II->getName() == "ios")
2460 NewII = &S.Context.Idents.get("watchos");
2461 else if (II->getName() == "ios_app_extension")
2462 NewII = &S.Context.Idents.get("watchos_app_extension");
2465 auto adjustWatchOSVersion = [](VersionTuple Version) -> VersionTuple {
2466 if (Version.empty())
2468 auto Major = Version.getMajor();
2469 auto NewMajor = Major >= 9 ? Major - 7 : 0;
2470 if (NewMajor >= 2) {
2471 if (Version.getMinor().hasValue()) {
2472 if (Version.getSubminor().hasValue())
2473 return VersionTuple(NewMajor, Version.getMinor().getValue(),
2474 Version.getSubminor().getValue());
2476 return VersionTuple(NewMajor, Version.getMinor().getValue());
2480 return VersionTuple(2, 0);
2483 auto NewIntroduced = adjustWatchOSVersion(Introduced.Version);
2484 auto NewDeprecated = adjustWatchOSVersion(Deprecated.Version);
2485 auto NewObsoleted = adjustWatchOSVersion(Obsoleted.Version);
2487 AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND,
2500 D->addAttr(NewAttr);
2502 } else if (S.Context.getTargetInfo().getTriple().isTvOS()) {
2503 // Transcribe "ios" to "tvos" (and add a new attribute) if the versioning
2504 // matches before the start of the tvOS platform.
2505 IdentifierInfo *NewII = nullptr;
2506 if (II->getName() == "ios")
2507 NewII = &S.Context.Idents.get("tvos");
2508 else if (II->getName() == "ios_app_extension")
2509 NewII = &S.Context.Idents.get("tvos_app_extension");
2512 AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND,
2525 D->addAttr(NewAttr);
2530 static void handleExternalSourceSymbolAttr(Sema &S, Decl *D,
2531 const AttributeList &Attr) {
2532 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
2534 assert(checkAttributeAtMostNumArgs(S, Attr, 3) &&
2535 "Invalid number of arguments in an external_source_symbol attribute");
2538 if (const auto *SE = dyn_cast_or_null<StringLiteral>(Attr.getArgAsExpr(0)))
2539 Language = SE->getString();
2540 StringRef DefinedIn;
2541 if (const auto *SE = dyn_cast_or_null<StringLiteral>(Attr.getArgAsExpr(1)))
2542 DefinedIn = SE->getString();
2543 bool IsGeneratedDeclaration = Attr.getArgAsIdent(2) != nullptr;
2545 D->addAttr(::new (S.Context) ExternalSourceSymbolAttr(
2546 Attr.getRange(), S.Context, Language, DefinedIn, IsGeneratedDeclaration,
2547 Attr.getAttributeSpellingListIndex()));
2551 static T *mergeVisibilityAttr(Sema &S, Decl *D, SourceRange range,
2552 typename T::VisibilityType value,
2553 unsigned attrSpellingListIndex) {
2554 T *existingAttr = D->getAttr<T>();
2556 typename T::VisibilityType existingValue = existingAttr->getVisibility();
2557 if (existingValue == value)
2559 S.Diag(existingAttr->getLocation(), diag::err_mismatched_visibility);
2560 S.Diag(range.getBegin(), diag::note_previous_attribute);
2563 return ::new (S.Context) T(range, S.Context, value, attrSpellingListIndex);
2566 VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range,
2567 VisibilityAttr::VisibilityType Vis,
2568 unsigned AttrSpellingListIndex) {
2569 return ::mergeVisibilityAttr<VisibilityAttr>(*this, D, Range, Vis,
2570 AttrSpellingListIndex);
2573 TypeVisibilityAttr *Sema::mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
2574 TypeVisibilityAttr::VisibilityType Vis,
2575 unsigned AttrSpellingListIndex) {
2576 return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, Range, Vis,
2577 AttrSpellingListIndex);
2580 static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr,
2581 bool isTypeVisibility) {
2582 // Visibility attributes don't mean anything on a typedef.
2583 if (isa<TypedefNameDecl>(D)) {
2584 S.Diag(Attr.getRange().getBegin(), diag::warn_attribute_ignored)
2589 // 'type_visibility' can only go on a type or namespace.
2590 if (isTypeVisibility &&
2591 !(isa<TagDecl>(D) ||
2592 isa<ObjCInterfaceDecl>(D) ||
2593 isa<NamespaceDecl>(D))) {
2594 S.Diag(Attr.getRange().getBegin(), diag::err_attribute_wrong_decl_type)
2595 << Attr.getName() << ExpectedTypeOrNamespace;
2599 // Check that the argument is a string literal.
2601 SourceLocation LiteralLoc;
2602 if (!S.checkStringLiteralArgumentAttr(Attr, 0, TypeStr, &LiteralLoc))
2605 VisibilityAttr::VisibilityType type;
2606 if (!VisibilityAttr::ConvertStrToVisibilityType(TypeStr, type)) {
2607 S.Diag(LiteralLoc, diag::warn_attribute_type_not_supported)
2608 << Attr.getName() << TypeStr;
2612 // Complain about attempts to use protected visibility on targets
2613 // (like Darwin) that don't support it.
2614 if (type == VisibilityAttr::Protected &&
2615 !S.Context.getTargetInfo().hasProtectedVisibility()) {
2616 S.Diag(Attr.getLoc(), diag::warn_attribute_protected_visibility);
2617 type = VisibilityAttr::Default;
2620 unsigned Index = Attr.getAttributeSpellingListIndex();
2621 clang::Attr *newAttr;
2622 if (isTypeVisibility) {
2623 newAttr = S.mergeTypeVisibilityAttr(D, Attr.getRange(),
2624 (TypeVisibilityAttr::VisibilityType) type,
2627 newAttr = S.mergeVisibilityAttr(D, Attr.getRange(), type, Index);
2630 D->addAttr(newAttr);
2633 static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl,
2634 const AttributeList &Attr) {
2635 ObjCMethodDecl *method = cast<ObjCMethodDecl>(decl);
2636 if (!Attr.isArgIdent(0)) {
2637 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2638 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
2642 IdentifierLoc *IL = Attr.getArgAsIdent(0);
2643 ObjCMethodFamilyAttr::FamilyKind F;
2644 if (!ObjCMethodFamilyAttr::ConvertStrToFamilyKind(IL->Ident->getName(), F)) {
2645 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << Attr.getName()
2650 if (F == ObjCMethodFamilyAttr::OMF_init &&
2651 !method->getReturnType()->isObjCObjectPointerType()) {
2652 S.Diag(method->getLocation(), diag::err_init_method_bad_return_type)
2653 << method->getReturnType();
2654 // Ignore the attribute.
2658 method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getRange(),
2660 Attr.getAttributeSpellingListIndex()));
2663 static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) {
2664 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
2665 QualType T = TD->getUnderlyingType();
2666 if (!T->isCARCBridgableType()) {
2667 S.Diag(TD->getLocation(), diag::err_nsobject_attribute);
2671 else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
2672 QualType T = PD->getType();
2673 if (!T->isCARCBridgableType()) {
2674 S.Diag(PD->getLocation(), diag::err_nsobject_attribute);
2679 // It is okay to include this attribute on properties, e.g.:
2681 // @property (retain, nonatomic) struct Bork *Q __attribute__((NSObject));
2683 // In this case it follows tradition and suppresses an error in the above
2685 S.Diag(D->getLocation(), diag::warn_nsobject_attribute);
2687 D->addAttr(::new (S.Context)
2688 ObjCNSObjectAttr(Attr.getRange(), S.Context,
2689 Attr.getAttributeSpellingListIndex()));
2692 static void handleObjCIndependentClass(Sema &S, Decl *D, const AttributeList &Attr) {
2693 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
2694 QualType T = TD->getUnderlyingType();
2695 if (!T->isObjCObjectPointerType()) {
2696 S.Diag(TD->getLocation(), diag::warn_ptr_independentclass_attribute);
2700 S.Diag(D->getLocation(), diag::warn_independentclass_attribute);
2703 D->addAttr(::new (S.Context)
2704 ObjCIndependentClassAttr(Attr.getRange(), S.Context,
2705 Attr.getAttributeSpellingListIndex()));
2708 static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2709 if (!Attr.isArgIdent(0)) {
2710 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2711 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
2715 IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
2716 BlocksAttr::BlockType type;
2717 if (!BlocksAttr::ConvertStrToBlockType(II->getName(), type)) {
2718 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
2719 << Attr.getName() << II;
2723 D->addAttr(::new (S.Context)
2724 BlocksAttr(Attr.getRange(), S.Context, type,
2725 Attr.getAttributeSpellingListIndex()));
2728 static void handleSentinelAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2729 unsigned sentinel = (unsigned)SentinelAttr::DefaultSentinel;
2730 if (Attr.getNumArgs() > 0) {
2731 Expr *E = Attr.getArgAsExpr(0);
2732 llvm::APSInt Idx(32);
2733 if (E->isTypeDependent() || E->isValueDependent() ||
2734 !E->isIntegerConstantExpr(Idx, S.Context)) {
2735 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2736 << Attr.getName() << 1 << AANT_ArgumentIntegerConstant
2737 << E->getSourceRange();
2741 if (Idx.isSigned() && Idx.isNegative()) {
2742 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero)
2743 << E->getSourceRange();
2747 sentinel = Idx.getZExtValue();
2750 unsigned nullPos = (unsigned)SentinelAttr::DefaultNullPos;
2751 if (Attr.getNumArgs() > 1) {
2752 Expr *E = Attr.getArgAsExpr(1);
2753 llvm::APSInt Idx(32);
2754 if (E->isTypeDependent() || E->isValueDependent() ||
2755 !E->isIntegerConstantExpr(Idx, S.Context)) {
2756 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2757 << Attr.getName() << 2 << AANT_ArgumentIntegerConstant
2758 << E->getSourceRange();
2761 nullPos = Idx.getZExtValue();
2763 if ((Idx.isSigned() && Idx.isNegative()) || nullPos > 1) {
2764 // FIXME: This error message could be improved, it would be nice
2765 // to say what the bounds actually are.
2766 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one)
2767 << E->getSourceRange();
2772 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2773 const FunctionType *FT = FD->getType()->castAs<FunctionType>();
2774 if (isa<FunctionNoProtoType>(FT)) {
2775 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_named_arguments);
2779 if (!cast<FunctionProtoType>(FT)->isVariadic()) {
2780 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
2783 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
2784 if (!MD->isVariadic()) {
2785 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
2788 } else if (BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
2789 if (!BD->isVariadic()) {
2790 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 1;
2793 } else if (const VarDecl *V = dyn_cast<VarDecl>(D)) {
2794 QualType Ty = V->getType();
2795 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
2796 const FunctionType *FT = Ty->isFunctionPointerType()
2797 ? D->getFunctionType()
2798 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
2799 if (!cast<FunctionProtoType>(FT)->isVariadic()) {
2800 int m = Ty->isFunctionPointerType() ? 0 : 1;
2801 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m;
2805 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2806 << Attr.getName() << ExpectedFunctionMethodOrBlock;
2810 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2811 << Attr.getName() << ExpectedFunctionMethodOrBlock;
2814 D->addAttr(::new (S.Context)
2815 SentinelAttr(Attr.getRange(), S.Context, sentinel, nullPos,
2816 Attr.getAttributeSpellingListIndex()));
2819 static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) {
2820 if (D->getFunctionType() &&
2821 D->getFunctionType()->getReturnType()->isVoidType()) {
2822 S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
2823 << Attr.getName() << 0;
2826 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
2827 if (MD->getReturnType()->isVoidType()) {
2828 S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
2829 << Attr.getName() << 1;
2833 // If this is spelled as the standard C++1z attribute, but not in C++1z, warn
2834 // about using it as an extension.
2835 if (!S.getLangOpts().CPlusPlus1z && Attr.isCXX11Attribute() &&
2836 !Attr.getScopeName())
2837 S.Diag(Attr.getLoc(), diag::ext_cxx1z_attr) << Attr.getName();
2839 D->addAttr(::new (S.Context)
2840 WarnUnusedResultAttr(Attr.getRange(), S.Context,
2841 Attr.getAttributeSpellingListIndex()));
2844 static void handleWeakImportAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2845 // weak_import only applies to variable & function declarations.
2847 if (!D->canBeWeakImported(isDef)) {
2849 S.Diag(Attr.getLoc(), diag::warn_attribute_invalid_on_definition)
2851 else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) ||
2852 (S.Context.getTargetInfo().getTriple().isOSDarwin() &&
2853 (isa<ObjCInterfaceDecl>(D) || isa<EnumDecl>(D)))) {
2854 // Nothing to warn about here.
2856 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2857 << Attr.getName() << ExpectedVariableOrFunction;
2862 D->addAttr(::new (S.Context)
2863 WeakImportAttr(Attr.getRange(), S.Context,
2864 Attr.getAttributeSpellingListIndex()));
2867 // Handles reqd_work_group_size and work_group_size_hint.
2868 template <typename WorkGroupAttr>
2869 static void handleWorkGroupSize(Sema &S, Decl *D,
2870 const AttributeList &Attr) {
2872 for (unsigned i = 0; i < 3; ++i) {
2873 const Expr *E = Attr.getArgAsExpr(i);
2874 if (!checkUInt32Argument(S, Attr, E, WGSize[i], i))
2876 if (WGSize[i] == 0) {
2877 S.Diag(Attr.getLoc(), diag::err_attribute_argument_is_zero)
2878 << Attr.getName() << E->getSourceRange();
2883 WorkGroupAttr *Existing = D->getAttr<WorkGroupAttr>();
2884 if (Existing && !(Existing->getXDim() == WGSize[0] &&
2885 Existing->getYDim() == WGSize[1] &&
2886 Existing->getZDim() == WGSize[2]))
2887 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
2889 D->addAttr(::new (S.Context) WorkGroupAttr(Attr.getRange(), S.Context,
2890 WGSize[0], WGSize[1], WGSize[2],
2891 Attr.getAttributeSpellingListIndex()));
2894 // Handles intel_reqd_sub_group_size.
2895 static void handleSubGroupSize(Sema &S, Decl *D, const AttributeList &Attr) {
2897 const Expr *E = Attr.getArgAsExpr(0);
2898 if (!checkUInt32Argument(S, Attr, E, SGSize))
2901 S.Diag(Attr.getLoc(), diag::err_attribute_argument_is_zero)
2902 << Attr.getName() << E->getSourceRange();
2906 OpenCLIntelReqdSubGroupSizeAttr *Existing =
2907 D->getAttr<OpenCLIntelReqdSubGroupSizeAttr>();
2908 if (Existing && Existing->getSubGroupSize() != SGSize)
2909 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
2911 D->addAttr(::new (S.Context) OpenCLIntelReqdSubGroupSizeAttr(
2912 Attr.getRange(), S.Context, SGSize,
2913 Attr.getAttributeSpellingListIndex()));
2916 static void handleVecTypeHint(Sema &S, Decl *D, const AttributeList &Attr) {
2917 if (!Attr.hasParsedType()) {
2918 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
2919 << Attr.getName() << 1;
2923 TypeSourceInfo *ParmTSI = nullptr;
2924 QualType ParmType = S.GetTypeFromParser(Attr.getTypeArg(), &ParmTSI);
2925 assert(ParmTSI && "no type source info for attribute argument");
2927 if (!ParmType->isExtVectorType() && !ParmType->isFloatingType() &&
2928 (ParmType->isBooleanType() ||
2929 !ParmType->isIntegralType(S.getASTContext()))) {
2930 S.Diag(Attr.getLoc(), diag::err_attribute_argument_vec_type_hint)
2935 if (VecTypeHintAttr *A = D->getAttr<VecTypeHintAttr>()) {
2936 if (!S.Context.hasSameType(A->getTypeHint(), ParmType)) {
2937 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
2942 D->addAttr(::new (S.Context) VecTypeHintAttr(Attr.getLoc(), S.Context,
2944 Attr.getAttributeSpellingListIndex()));
2947 SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range,
2949 unsigned AttrSpellingListIndex) {
2950 if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) {
2951 if (ExistingAttr->getName() == Name)
2953 Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section);
2954 Diag(Range.getBegin(), diag::note_previous_attribute);
2957 return ::new (Context) SectionAttr(Range, Context, Name,
2958 AttrSpellingListIndex);
2961 bool Sema::checkSectionName(SourceLocation LiteralLoc, StringRef SecName) {
2962 std::string Error = Context.getTargetInfo().isValidSectionSpecifier(SecName);
2963 if (!Error.empty()) {
2964 Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target) << Error;
2970 static void handleSectionAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2971 // Make sure that there is a string literal as the sections's single
2974 SourceLocation LiteralLoc;
2975 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &LiteralLoc))
2978 if (!S.checkSectionName(LiteralLoc, Str))
2981 // If the target wants to validate the section specifier, make it happen.
2982 std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(Str);
2983 if (!Error.empty()) {
2984 S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target)
2989 unsigned Index = Attr.getAttributeSpellingListIndex();
2990 SectionAttr *NewAttr = S.mergeSectionAttr(D, Attr.getRange(), Str, Index);
2992 D->addAttr(NewAttr);
2995 // Check for things we'd like to warn about, no errors or validation for now.
2996 // TODO: Validation should use a backend target library that specifies
2997 // the allowable subtarget features and cpus. We could use something like a
2998 // TargetCodeGenInfo hook here to do validation.
2999 void Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
3000 for (auto Str : {"tune=", "fpmath="})
3001 if (AttrStr.find(Str) != StringRef::npos)
3002 Diag(LiteralLoc, diag::warn_unsupported_target_attribute) << Str;
3005 static void handleTargetAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3007 SourceLocation LiteralLoc;
3008 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &LiteralLoc))
3010 S.checkTargetAttr(LiteralLoc, Str);
3011 unsigned Index = Attr.getAttributeSpellingListIndex();
3012 TargetAttr *NewAttr =
3013 ::new (S.Context) TargetAttr(Attr.getRange(), S.Context, Str, Index);
3014 D->addAttr(NewAttr);
3017 static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3018 VarDecl *VD = cast<VarDecl>(D);
3019 if (!VD->hasLocalStorage()) {
3020 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
3024 Expr *E = Attr.getArgAsExpr(0);
3025 SourceLocation Loc = E->getExprLoc();
3026 FunctionDecl *FD = nullptr;
3027 DeclarationNameInfo NI;
3029 // gcc only allows for simple identifiers. Since we support more than gcc, we
3030 // will warn the user.
3031 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
3032 if (DRE->hasQualifier())
3033 S.Diag(Loc, diag::warn_cleanup_ext);
3034 FD = dyn_cast<FunctionDecl>(DRE->getDecl());
3035 NI = DRE->getNameInfo();
3037 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 1
3041 } else if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
3042 if (ULE->hasExplicitTemplateArgs())
3043 S.Diag(Loc, diag::warn_cleanup_ext);
3044 FD = S.ResolveSingleFunctionTemplateSpecialization(ULE, true);
3045 NI = ULE->getNameInfo();
3047 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 2
3049 if (ULE->getType() == S.Context.OverloadTy)
3050 S.NoteAllOverloadCandidates(ULE);
3054 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 0;
3058 if (FD->getNumParams() != 1) {
3059 S.Diag(Loc, diag::err_attribute_cleanup_func_must_take_one_arg)
3064 // We're currently more strict than GCC about what function types we accept.
3065 // If this ever proves to be a problem it should be easy to fix.
3066 QualType Ty = S.Context.getPointerType(VD->getType());
3067 QualType ParamTy = FD->getParamDecl(0)->getType();
3068 if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(),
3069 ParamTy, Ty) != Sema::Compatible) {
3070 S.Diag(Loc, diag::err_attribute_cleanup_func_arg_incompatible_type)
3071 << NI.getName() << ParamTy << Ty;
3075 D->addAttr(::new (S.Context)
3076 CleanupAttr(Attr.getRange(), S.Context, FD,
3077 Attr.getAttributeSpellingListIndex()));
3080 static void handleEnumExtensibilityAttr(Sema &S, Decl *D,
3081 const AttributeList &Attr) {
3082 if (!Attr.isArgIdent(0)) {
3083 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
3084 << Attr.getName() << 0 << AANT_ArgumentIdentifier;
3088 EnumExtensibilityAttr::Kind ExtensibilityKind;
3089 IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
3090 if (!EnumExtensibilityAttr::ConvertStrToKind(II->getName(),
3091 ExtensibilityKind)) {
3092 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
3093 << Attr.getName() << II;
3097 D->addAttr(::new (S.Context) EnumExtensibilityAttr(
3098 Attr.getRange(), S.Context, ExtensibilityKind,
3099 Attr.getAttributeSpellingListIndex()));
3102 /// Handle __attribute__((format_arg((idx)))) attribute based on
3103 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
3104 static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3105 Expr *IdxExpr = Attr.getArgAsExpr(0);
3107 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 1, IdxExpr, Idx))
3110 // Make sure the format string is really a string.
3111 QualType Ty = getFunctionOrMethodParamType(D, Idx);
3113 bool NotNSStringTy = !isNSStringType(Ty, S.Context);
3114 if (NotNSStringTy &&
3115 !isCFStringType(Ty, S.Context) &&
3116 (!Ty->isPointerType() ||
3117 !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
3118 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
3119 << "a string type" << IdxExpr->getSourceRange()
3120 << getFunctionOrMethodParamRange(D, 0);
3123 Ty = getFunctionOrMethodResultType(D);
3124 if (!isNSStringType(Ty, S.Context) &&
3125 !isCFStringType(Ty, S.Context) &&
3126 (!Ty->isPointerType() ||
3127 !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
3128 S.Diag(Attr.getLoc(), diag::err_format_attribute_result_not)
3129 << (NotNSStringTy ? "string type" : "NSString")
3130 << IdxExpr->getSourceRange() << getFunctionOrMethodParamRange(D, 0);
3134 // We cannot use the Idx returned from checkFunctionOrMethodParameterIndex
3135 // because that has corrected for the implicit this parameter, and is zero-
3136 // based. The attribute expects what the user wrote explicitly.
3138 IdxExpr->EvaluateAsInt(Val, S.Context);
3140 D->addAttr(::new (S.Context)
3141 FormatArgAttr(Attr.getRange(), S.Context, Val.getZExtValue(),
3142 Attr.getAttributeSpellingListIndex()));
3145 enum FormatAttrKind {
3154 /// getFormatAttrKind - Map from format attribute names to supported format
3156 static FormatAttrKind getFormatAttrKind(StringRef Format) {
3157 return llvm::StringSwitch<FormatAttrKind>(Format)
3158 // Check for formats that get handled specially.
3159 .Case("NSString", NSStringFormat)
3160 .Case("CFString", CFStringFormat)
3161 .Case("strftime", StrftimeFormat)
3163 // Otherwise, check for supported formats.
3164 .Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
3165 .Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
3166 .Case("kprintf", SupportedFormat) // OpenBSD.
3167 .Case("freebsd_kprintf", SupportedFormat) // FreeBSD.
3168 .Case("os_trace", SupportedFormat)
3169 .Case("os_log", SupportedFormat)
3171 .Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
3172 .Default(InvalidFormat);
3175 /// Handle __attribute__((init_priority(priority))) attributes based on
3176 /// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html
3177 static void handleInitPriorityAttr(Sema &S, Decl *D,
3178 const AttributeList &Attr) {
3179 if (!S.getLangOpts().CPlusPlus) {
3180 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
3184 if (S.getCurFunctionOrMethodDecl()) {
3185 S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
3189 QualType T = cast<VarDecl>(D)->getType();
3190 if (S.Context.getAsArrayType(T))
3191 T = S.Context.getBaseElementType(T);
3192 if (!T->getAs<RecordType>()) {
3193 S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
3198 Expr *E = Attr.getArgAsExpr(0);
3199 uint32_t prioritynum;
3200 if (!checkUInt32Argument(S, Attr, E, prioritynum)) {
3205 if (prioritynum < 101 || prioritynum > 65535) {
3206 S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range)
3207 << E->getSourceRange() << Attr.getName() << 101 << 65535;
3211 D->addAttr(::new (S.Context)
3212 InitPriorityAttr(Attr.getRange(), S.Context, prioritynum,
3213 Attr.getAttributeSpellingListIndex()));
3216 FormatAttr *Sema::mergeFormatAttr(Decl *D, SourceRange Range,
3217 IdentifierInfo *Format, int FormatIdx,
3219 unsigned AttrSpellingListIndex) {
3220 // Check whether we already have an equivalent format attribute.
3221 for (auto *F : D->specific_attrs<FormatAttr>()) {
3222 if (F->getType() == Format &&
3223 F->getFormatIdx() == FormatIdx &&
3224 F->getFirstArg() == FirstArg) {
3225 // If we don't have a valid location for this attribute, adopt the
3227 if (F->getLocation().isInvalid())
3233 return ::new (Context) FormatAttr(Range, Context, Format, FormatIdx,
3234 FirstArg, AttrSpellingListIndex);
3237 /// Handle __attribute__((format(type,idx,firstarg))) attributes based on
3238 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
3239 static void handleFormatAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3240 if (!Attr.isArgIdent(0)) {
3241 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
3242 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
3246 // In C++ the implicit 'this' function parameter also counts, and they are
3247 // counted from one.
3248 bool HasImplicitThisParam = isInstanceMethod(D);
3249 unsigned NumArgs = getFunctionOrMethodNumParams(D) + HasImplicitThisParam;
3251 IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
3252 StringRef Format = II->getName();
3254 if (normalizeName(Format)) {
3255 // If we've modified the string name, we need a new identifier for it.
3256 II = &S.Context.Idents.get(Format);
3259 // Check for supported formats.
3260 FormatAttrKind Kind = getFormatAttrKind(Format);
3262 if (Kind == IgnoredFormat)
3265 if (Kind == InvalidFormat) {
3266 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
3267 << Attr.getName() << II->getName();
3271 // checks for the 2nd argument
3272 Expr *IdxExpr = Attr.getArgAsExpr(1);
3274 if (!checkUInt32Argument(S, Attr, IdxExpr, Idx, 2))
3277 if (Idx < 1 || Idx > NumArgs) {
3278 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
3279 << Attr.getName() << 2 << IdxExpr->getSourceRange();
3283 // FIXME: Do we need to bounds check?
3284 unsigned ArgIdx = Idx - 1;
3286 if (HasImplicitThisParam) {
3288 S.Diag(Attr.getLoc(),
3289 diag::err_format_attribute_implicit_this_format_string)
3290 << IdxExpr->getSourceRange();
3296 // make sure the format string is really a string
3297 QualType Ty = getFunctionOrMethodParamType(D, ArgIdx);
3299 if (Kind == CFStringFormat) {
3300 if (!isCFStringType(Ty, S.Context)) {
3301 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
3302 << "a CFString" << IdxExpr->getSourceRange()
3303 << getFunctionOrMethodParamRange(D, ArgIdx);
3306 } else if (Kind == NSStringFormat) {
3307 // FIXME: do we need to check if the type is NSString*? What are the
3309 if (!isNSStringType(Ty, S.Context)) {
3310 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
3311 << "an NSString" << IdxExpr->getSourceRange()
3312 << getFunctionOrMethodParamRange(D, ArgIdx);
3315 } else if (!Ty->isPointerType() ||
3316 !Ty->getAs<PointerType>()->getPointeeType()->isCharType()) {
3317 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
3318 << "a string type" << IdxExpr->getSourceRange()
3319 << getFunctionOrMethodParamRange(D, ArgIdx);
3323 // check the 3rd argument
3324 Expr *FirstArgExpr = Attr.getArgAsExpr(2);
3326 if (!checkUInt32Argument(S, Attr, FirstArgExpr, FirstArg, 3))
3329 // check if the function is variadic if the 3rd argument non-zero
3330 if (FirstArg != 0) {
3331 if (isFunctionOrMethodVariadic(D)) {
3332 ++NumArgs; // +1 for ...
3334 S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic);
3339 // strftime requires FirstArg to be 0 because it doesn't read from any
3340 // variable the input is just the current time + the format string.
3341 if (Kind == StrftimeFormat) {
3342 if (FirstArg != 0) {
3343 S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter)
3344 << FirstArgExpr->getSourceRange();
3347 // if 0 it disables parameter checking (to use with e.g. va_list)
3348 } else if (FirstArg != 0 && FirstArg != NumArgs) {
3349 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
3350 << Attr.getName() << 3 << FirstArgExpr->getSourceRange();
3354 FormatAttr *NewAttr = S.mergeFormatAttr(D, Attr.getRange(), II,
3356 Attr.getAttributeSpellingListIndex());
3358 D->addAttr(NewAttr);
3361 static void handleTransparentUnionAttr(Sema &S, Decl *D,
3362 const AttributeList &Attr) {
3363 // Try to find the underlying union declaration.
3364 RecordDecl *RD = nullptr;
3365 TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
3366 if (TD && TD->getUnderlyingType()->isUnionType())
3367 RD = TD->getUnderlyingType()->getAsUnionType()->getDecl();
3369 RD = dyn_cast<RecordDecl>(D);
3371 if (!RD || !RD->isUnion()) {
3372 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
3373 << Attr.getName() << ExpectedUnion;
3377 if (!RD->isCompleteDefinition()) {
3378 if (!RD->isBeingDefined())
3379 S.Diag(Attr.getLoc(),
3380 diag::warn_transparent_union_attribute_not_definition);
3384 RecordDecl::field_iterator Field = RD->field_begin(),
3385 FieldEnd = RD->field_end();
3386 if (Field == FieldEnd) {
3387 S.Diag(Attr.getLoc(), diag::warn_transparent_union_attribute_zero_fields);
3391 FieldDecl *FirstField = *Field;
3392 QualType FirstType = FirstField->getType();
3393 if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) {
3394 S.Diag(FirstField->getLocation(),
3395 diag::warn_transparent_union_attribute_floating)
3396 << FirstType->isVectorType() << FirstType;
3400 if (FirstType->isIncompleteType())
3402 uint64_t FirstSize = S.Context.getTypeSize(FirstType);
3403 uint64_t FirstAlign = S.Context.getTypeAlign(FirstType);
3404 for (; Field != FieldEnd; ++Field) {
3405 QualType FieldType = Field->getType();
3406 if (FieldType->isIncompleteType())
3408 // FIXME: this isn't fully correct; we also need to test whether the
3409 // members of the union would all have the same calling convention as the
3410 // first member of the union. Checking just the size and alignment isn't
3411 // sufficient (consider structs passed on the stack instead of in registers
3413 if (S.Context.getTypeSize(FieldType) != FirstSize ||
3414 S.Context.getTypeAlign(FieldType) > FirstAlign) {
3415 // Warn if we drop the attribute.
3416 bool isSize = S.Context.getTypeSize(FieldType) != FirstSize;
3417 unsigned FieldBits = isSize? S.Context.getTypeSize(FieldType)
3418 : S.Context.getTypeAlign(FieldType);
3419 S.Diag(Field->getLocation(),
3420 diag::warn_transparent_union_attribute_field_size_align)
3421 << isSize << Field->getDeclName() << FieldBits;
3422 unsigned FirstBits = isSize? FirstSize : FirstAlign;
3423 S.Diag(FirstField->getLocation(),
3424 diag::note_transparent_union_first_field_size_align)
3425 << isSize << FirstBits;
3430 RD->addAttr(::new (S.Context)
3431 TransparentUnionAttr(Attr.getRange(), S.Context,
3432 Attr.getAttributeSpellingListIndex()));
3435 static void handleAnnotateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3436 // Make sure that there is a string literal as the annotation's single
3439 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
3442 // Don't duplicate annotations that are already set.
3443 for (const auto *I : D->specific_attrs<AnnotateAttr>()) {
3444 if (I->getAnnotation() == Str)
3448 D->addAttr(::new (S.Context)
3449 AnnotateAttr(Attr.getRange(), S.Context, Str,
3450 Attr.getAttributeSpellingListIndex()));
3453 static void handleAlignValueAttr(Sema &S, Decl *D,
3454 const AttributeList &Attr) {
3455 S.AddAlignValueAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
3456 Attr.getAttributeSpellingListIndex());
3459 void Sema::AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
3460 unsigned SpellingListIndex) {
3461 AlignValueAttr TmpAttr(AttrRange, Context, E, SpellingListIndex);
3462 SourceLocation AttrLoc = AttrRange.getBegin();
3465 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
3466 T = TD->getUnderlyingType();
3467 else if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
3470 llvm_unreachable("Unknown decl type for align_value");
3472 if (!T->isDependentType() && !T->isAnyPointerType() &&
3473 !T->isReferenceType() && !T->isMemberPointerType()) {
3474 Diag(AttrLoc, diag::warn_attribute_pointer_or_reference_only)
3475 << &TmpAttr /*TmpAttr.getName()*/ << T << D->getSourceRange();
3479 if (!E->isValueDependent()) {
3480 llvm::APSInt Alignment;
3482 = VerifyIntegerConstantExpression(E, &Alignment,
3483 diag::err_align_value_attribute_argument_not_int,
3484 /*AllowFold*/ false);
3485 if (ICE.isInvalid())
3488 if (!Alignment.isPowerOf2()) {
3489 Diag(AttrLoc, diag::err_alignment_not_power_of_two)
3490 << E->getSourceRange();
3494 D->addAttr(::new (Context)
3495 AlignValueAttr(AttrRange, Context, ICE.get(),
3496 SpellingListIndex));
3500 // Save dependent expressions in the AST to be instantiated.
3501 D->addAttr(::new (Context) AlignValueAttr(TmpAttr));
3504 static void handleAlignedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3505 // check the attribute arguments.
3506 if (Attr.getNumArgs() > 1) {
3507 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
3508 << Attr.getName() << 1;
3512 if (Attr.getNumArgs() == 0) {
3513 D->addAttr(::new (S.Context) AlignedAttr(Attr.getRange(), S.Context,
3514 true, nullptr, Attr.getAttributeSpellingListIndex()));
3518 Expr *E = Attr.getArgAsExpr(0);
3519 if (Attr.isPackExpansion() && !E->containsUnexpandedParameterPack()) {
3520 S.Diag(Attr.getEllipsisLoc(),
3521 diag::err_pack_expansion_without_parameter_packs);
3525 if (!Attr.isPackExpansion() && S.DiagnoseUnexpandedParameterPack(E))
3528 if (E->isValueDependent()) {
3529 if (const auto *TND = dyn_cast<TypedefNameDecl>(D)) {
3530 if (!TND->getUnderlyingType()->isDependentType()) {
3531 S.Diag(Attr.getLoc(), diag::err_alignment_dependent_typedef_name)
3532 << E->getSourceRange();
3538 S.AddAlignedAttr(Attr.getRange(), D, E, Attr.getAttributeSpellingListIndex(),
3539 Attr.isPackExpansion());
3542 void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
3543 unsigned SpellingListIndex, bool IsPackExpansion) {
3544 AlignedAttr TmpAttr(AttrRange, Context, true, E, SpellingListIndex);
3545 SourceLocation AttrLoc = AttrRange.getBegin();
3547 // C++11 alignas(...) and C11 _Alignas(...) have additional requirements.
3548 if (TmpAttr.isAlignas()) {
3549 // C++11 [dcl.align]p1:
3550 // An alignment-specifier may be applied to a variable or to a class
3551 // data member, but it shall not be applied to a bit-field, a function
3552 // parameter, the formal parameter of a catch clause, or a variable
3553 // declared with the register storage class specifier. An
3554 // alignment-specifier may also be applied to the declaration of a class
3555 // or enumeration type.
3557 // An alignment attribute shall not be specified in a declaration of
3558 // a typedef, or a bit-field, or a function, or a parameter, or an
3559 // object declared with the register storage-class specifier.
3561 if (isa<ParmVarDecl>(D)) {
3563 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
3564 if (VD->getStorageClass() == SC_Register)
3566 if (VD->isExceptionVariable())
3568 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
3569 if (FD->isBitField())
3571 } else if (!isa<TagDecl>(D)) {
3572 Diag(AttrLoc, diag::err_attribute_wrong_decl_type) << &TmpAttr
3573 << (TmpAttr.isC11() ? ExpectedVariableOrField
3574 : ExpectedVariableFieldOrTag);
3577 if (DiagKind != -1) {
3578 Diag(AttrLoc, diag::err_alignas_attribute_wrong_decl_type)
3579 << &TmpAttr << DiagKind;
3584 if (E->isTypeDependent() || E->isValueDependent()) {
3585 // Save dependent expressions in the AST to be instantiated.
3586 AlignedAttr *AA = ::new (Context) AlignedAttr(TmpAttr);
3587 AA->setPackExpansion(IsPackExpansion);
3592 // FIXME: Cache the number on the Attr object?
3593 llvm::APSInt Alignment;
3595 = VerifyIntegerConstantExpression(E, &Alignment,
3596 diag::err_aligned_attribute_argument_not_int,
3597 /*AllowFold*/ false);
3598 if (ICE.isInvalid())
3601 uint64_t AlignVal = Alignment.getZExtValue();
3603 // C++11 [dcl.align]p2:
3604 // -- if the constant expression evaluates to zero, the alignment
3605 // specifier shall have no effect
3607 // An alignment specification of zero has no effect.
3608 if (!(TmpAttr.isAlignas() && !Alignment)) {
3609 if (!llvm::isPowerOf2_64(AlignVal)) {
3610 Diag(AttrLoc, diag::err_alignment_not_power_of_two)
3611 << E->getSourceRange();
3616 // Alignment calculations can wrap around if it's greater than 2**28.
3617 unsigned MaxValidAlignment =
3618 Context.getTargetInfo().getTriple().isOSBinFormatCOFF() ? 8192
3620 if (AlignVal > MaxValidAlignment) {
3621 Diag(AttrLoc, diag::err_attribute_aligned_too_great) << MaxValidAlignment
3622 << E->getSourceRange();
3626 if (Context.getTargetInfo().isTLSSupported()) {
3627 unsigned MaxTLSAlign =
3628 Context.toCharUnitsFromBits(Context.getTargetInfo().getMaxTLSAlign())
3630 auto *VD = dyn_cast<VarDecl>(D);
3631 if (MaxTLSAlign && AlignVal > MaxTLSAlign && VD &&
3632 VD->getTLSKind() != VarDecl::TLS_None) {
3633 Diag(VD->getLocation(), diag::err_tls_var_aligned_over_maximum)
3634 << (unsigned)AlignVal << VD << MaxTLSAlign;
3639 AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, true,
3640 ICE.get(), SpellingListIndex);
3641 AA->setPackExpansion(IsPackExpansion);
3645 void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *TS,
3646 unsigned SpellingListIndex, bool IsPackExpansion) {
3647 // FIXME: Cache the number on the Attr object if non-dependent?
3648 // FIXME: Perform checking of type validity
3649 AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, false, TS,
3651 AA->setPackExpansion(IsPackExpansion);
3655 void Sema::CheckAlignasUnderalignment(Decl *D) {
3656 assert(D->hasAttrs() && "no attributes on decl");
3658 QualType UnderlyingTy, DiagTy;
3659 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
3660 UnderlyingTy = DiagTy = VD->getType();
3662 UnderlyingTy = DiagTy = Context.getTagDeclType(cast<TagDecl>(D));
3663 if (EnumDecl *ED = dyn_cast<EnumDecl>(D))
3664 UnderlyingTy = ED->getIntegerType();
3666 if (DiagTy->isDependentType() || DiagTy->isIncompleteType())
3669 // C++11 [dcl.align]p5, C11 6.7.5/4:
3670 // The combined effect of all alignment attributes in a declaration shall
3671 // not specify an alignment that is less strict than the alignment that
3672 // would otherwise be required for the entity being declared.
3673 AlignedAttr *AlignasAttr = nullptr;
3675 for (auto *I : D->specific_attrs<AlignedAttr>()) {
3676 if (I->isAlignmentDependent())
3680 Align = std::max(Align, I->getAlignment(Context));
3683 if (AlignasAttr && Align) {
3684 CharUnits RequestedAlign = Context.toCharUnitsFromBits(Align);
3685 CharUnits NaturalAlign = Context.getTypeAlignInChars(UnderlyingTy);
3686 if (NaturalAlign > RequestedAlign)
3687 Diag(AlignasAttr->getLocation(), diag::err_alignas_underaligned)
3688 << DiagTy << (unsigned)NaturalAlign.getQuantity();
3692 bool Sema::checkMSInheritanceAttrOnDefinition(
3693 CXXRecordDecl *RD, SourceRange Range, bool BestCase,
3694 MSInheritanceAttr::Spelling SemanticSpelling) {
3695 assert(RD->hasDefinition() && "RD has no definition!");
3697 // We may not have seen base specifiers or any virtual methods yet. We will
3698 // have to wait until the record is defined to catch any mismatches.
3699 if (!RD->getDefinition()->isCompleteDefinition())
3702 // The unspecified model never matches what a definition could need.
3703 if (SemanticSpelling == MSInheritanceAttr::Keyword_unspecified_inheritance)
3707 if (RD->calculateInheritanceModel() == SemanticSpelling)
3710 if (RD->calculateInheritanceModel() <= SemanticSpelling)
3714 Diag(Range.getBegin(), diag::err_mismatched_ms_inheritance)
3715 << 0 /*definition*/;
3716 Diag(RD->getDefinition()->getLocation(), diag::note_defined_here)
3717 << RD->getNameAsString();
3721 /// parseModeAttrArg - Parses attribute mode string and returns parsed type
3723 static void parseModeAttrArg(Sema &S, StringRef Str, unsigned &DestWidth,
3724 bool &IntegerMode, bool &ComplexMode) {
3726 ComplexMode = false;
3727 switch (Str.size()) {
3749 if (Str[1] == 'F') {
3750 IntegerMode = false;
3751 } else if (Str[1] == 'C') {
3752 IntegerMode = false;
3754 } else if (Str[1] != 'I') {
3759 // FIXME: glibc uses 'word' to define register_t; this is narrower than a
3760 // pointer on PIC16 and other embedded platforms.
3762 DestWidth = S.Context.getTargetInfo().getRegisterWidth();
3763 else if (Str == "byte")
3764 DestWidth = S.Context.getTargetInfo().getCharWidth();
3767 if (Str == "pointer")
3768 DestWidth = S.Context.getTargetInfo().getPointerWidth(0);
3771 if (Str == "unwind_word")
3772 DestWidth = S.Context.getTargetInfo().getUnwindWordWidth();
3777 /// handleModeAttr - This attribute modifies the width of a decl with primitive
3780 /// Despite what would be logical, the mode attribute is a decl attribute, not a
3781 /// type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 'G' be
3782 /// HImode, not an intermediate pointer.
3783 static void handleModeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3784 // This attribute isn't documented, but glibc uses it. It changes
3785 // the width of an int or unsigned int to the specified size.
3786 if (!Attr.isArgIdent(0)) {
3787 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName()
3788 << AANT_ArgumentIdentifier;
3792 IdentifierInfo *Name = Attr.getArgAsIdent(0)->Ident;
3794 S.AddModeAttr(Attr.getRange(), D, Name, Attr.getAttributeSpellingListIndex());
3797 void Sema::AddModeAttr(SourceRange AttrRange, Decl *D, IdentifierInfo *Name,
3798 unsigned SpellingListIndex, bool InInstantiation) {
3799 StringRef Str = Name->getName();
3801 SourceLocation AttrLoc = AttrRange.getBegin();
3803 unsigned DestWidth = 0;
3804 bool IntegerMode = true;
3805 bool ComplexMode = false;
3806 llvm::APInt VectorSize(64, 0);
3807 if (Str.size() >= 4 && Str[0] == 'V') {
3808 // Minimal length of vector mode is 4: 'V' + NUMBER(>=1) + TYPE(>=2).
3809 size_t StrSize = Str.size();
3810 size_t VectorStringLength = 0;
3811 while ((VectorStringLength + 1) < StrSize &&
3812 isdigit(Str[VectorStringLength + 1]))
3813 ++VectorStringLength;
3814 if (VectorStringLength &&
3815 !Str.substr(1, VectorStringLength).getAsInteger(10, VectorSize) &&
3816 VectorSize.isPowerOf2()) {
3817 parseModeAttrArg(*this, Str.substr(VectorStringLength + 1), DestWidth,
3818 IntegerMode, ComplexMode);
3819 // Avoid duplicate warning from template instantiation.
3820 if (!InInstantiation)
3821 Diag(AttrLoc, diag::warn_vector_mode_deprecated);
3828 parseModeAttrArg(*this, Str, DestWidth, IntegerMode, ComplexMode);
3830 // FIXME: Sync this with InitializePredefinedMacros; we need to match int8_t
3831 // and friends, at least with glibc.
3832 // FIXME: Make sure floating-point mappings are accurate
3833 // FIXME: Support XF and TF types
3835 Diag(AttrLoc, diag::err_machine_mode) << 0 /*Unknown*/ << Name;
3840 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
3841 OldTy = TD->getUnderlyingType();
3842 else if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
3843 // Something like 'typedef enum { X } __attribute__((mode(XX))) T;'.
3844 // Try to get type from enum declaration, default to int.
3845 OldTy = ED->getIntegerType();
3847 OldTy = Context.IntTy;
3849 OldTy = cast<ValueDecl>(D)->getType();
3851 if (OldTy->isDependentType()) {
3852 D->addAttr(::new (Context)
3853 ModeAttr(AttrRange, Context, Name, SpellingListIndex));
3857 // Base type can also be a vector type (see PR17453).
3858 // Distinguish between base type and base element type.
3859 QualType OldElemTy = OldTy;
3860 if (const VectorType *VT = OldTy->getAs<VectorType>())
3861 OldElemTy = VT->getElementType();
3863 // GCC allows 'mode' attribute on enumeration types (even incomplete), except
3864 // for vector modes. So, 'enum X __attribute__((mode(QI)));' forms a complete
3865 // type, 'enum { A } __attribute__((mode(V4SI)))' is rejected.
3866 if ((isa<EnumDecl>(D) || OldElemTy->getAs<EnumType>()) &&
3867 VectorSize.getBoolValue()) {
3868 Diag(AttrLoc, diag::err_enum_mode_vector_type) << Name << AttrRange;
3871 bool IntegralOrAnyEnumType =
3872 OldElemTy->isIntegralOrEnumerationType() || OldElemTy->getAs<EnumType>();
3874 if (!OldElemTy->getAs<BuiltinType>() && !OldElemTy->isComplexType() &&
3875 !IntegralOrAnyEnumType)
3876 Diag(AttrLoc, diag::err_mode_not_primitive);
3877 else if (IntegerMode) {
3878 if (!IntegralOrAnyEnumType)
3879 Diag(AttrLoc, diag::err_mode_wrong_type);
3880 } else if (ComplexMode) {
3881 if (!OldElemTy->isComplexType())
3882 Diag(AttrLoc, diag::err_mode_wrong_type);
3884 if (!OldElemTy->isFloatingType())
3885 Diag(AttrLoc, diag::err_mode_wrong_type);
3891 NewElemTy = Context.getIntTypeForBitwidth(DestWidth,
3892 OldElemTy->isSignedIntegerType());
3894 NewElemTy = Context.getRealTypeForBitwidth(DestWidth);
3896 if (NewElemTy.isNull()) {
3897 Diag(AttrLoc, diag::err_machine_mode) << 1 /*Unsupported*/ << Name;
3902 NewElemTy = Context.getComplexType(NewElemTy);
3905 QualType NewTy = NewElemTy;
3906 if (VectorSize.getBoolValue()) {
3907 NewTy = Context.getVectorType(NewTy, VectorSize.getZExtValue(),
3908 VectorType::GenericVector);
3909 } else if (const VectorType *OldVT = OldTy->getAs<VectorType>()) {
3910 // Complex machine mode does not support base vector types.
3912 Diag(AttrLoc, diag::err_complex_mode_vector_type);
3915 unsigned NumElements = Context.getTypeSize(OldElemTy) *
3916 OldVT->getNumElements() /
3917 Context.getTypeSize(NewElemTy);
3919 Context.getVectorType(NewElemTy, NumElements, OldVT->getVectorKind());
3922 if (NewTy.isNull()) {
3923 Diag(AttrLoc, diag::err_mode_wrong_type);
3927 // Install the new type.
3928 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
3929 TD->setModedTypeSourceInfo(TD->getTypeSourceInfo(), NewTy);
3930 else if (EnumDecl *ED = dyn_cast<EnumDecl>(D))
3931 ED->setIntegerType(NewTy);
3933 cast<ValueDecl>(D)->setType(NewTy);
3935 D->addAttr(::new (Context)
3936 ModeAttr(AttrRange, Context, Name, SpellingListIndex));
3939 static void handleNoDebugAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3940 D->addAttr(::new (S.Context)
3941 NoDebugAttr(Attr.getRange(), S.Context,
3942 Attr.getAttributeSpellingListIndex()));
3945 AlwaysInlineAttr *Sema::mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
3946 IdentifierInfo *Ident,
3947 unsigned AttrSpellingListIndex) {
3948 if (OptimizeNoneAttr *Optnone = D->getAttr<OptimizeNoneAttr>()) {
3949 Diag(Range.getBegin(), diag::warn_attribute_ignored) << Ident;
3950 Diag(Optnone->getLocation(), diag::note_conflicting_attribute);
3954 if (D->hasAttr<AlwaysInlineAttr>())
3957 return ::new (Context) AlwaysInlineAttr(Range, Context,
3958 AttrSpellingListIndex);
3961 CommonAttr *Sema::mergeCommonAttr(Decl *D, SourceRange Range,
3962 IdentifierInfo *Ident,
3963 unsigned AttrSpellingListIndex) {
3964 if (checkAttrMutualExclusion<InternalLinkageAttr>(*this, D, Range, Ident))
3967 return ::new (Context) CommonAttr(Range, Context, AttrSpellingListIndex);
3970 InternalLinkageAttr *
3971 Sema::mergeInternalLinkageAttr(Decl *D, SourceRange Range,
3972 IdentifierInfo *Ident,
3973 unsigned AttrSpellingListIndex) {
3974 if (auto VD = dyn_cast<VarDecl>(D)) {
3975 // Attribute applies to Var but not any subclass of it (like ParmVar,
3976 // ImplicitParm or VarTemplateSpecialization).
3977 if (VD->getKind() != Decl::Var) {
3978 Diag(Range.getBegin(), diag::warn_attribute_wrong_decl_type)
3979 << Ident << (getLangOpts().CPlusPlus ? ExpectedFunctionVariableOrClass
3980 : ExpectedVariableOrFunction);
3983 // Attribute does not apply to non-static local variables.
3984 if (VD->hasLocalStorage()) {
3985 Diag(VD->getLocation(), diag::warn_internal_linkage_local_storage);
3990 if (checkAttrMutualExclusion<CommonAttr>(*this, D, Range, Ident))
3993 return ::new (Context)
3994 InternalLinkageAttr(Range, Context, AttrSpellingListIndex);
3997 MinSizeAttr *Sema::mergeMinSizeAttr(Decl *D, SourceRange Range,
3998 unsigned AttrSpellingListIndex) {
3999 if (OptimizeNoneAttr *Optnone = D->getAttr<OptimizeNoneAttr>()) {
4000 Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'minsize'";
4001 Diag(Optnone->getLocation(), diag::note_conflicting_attribute);
4005 if (D->hasAttr<MinSizeAttr>())
4008 return ::new (Context) MinSizeAttr(Range, Context, AttrSpellingListIndex);
4011 OptimizeNoneAttr *Sema::mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
4012 unsigned AttrSpellingListIndex) {
4013 if (AlwaysInlineAttr *Inline = D->getAttr<AlwaysInlineAttr>()) {
4014 Diag(Inline->getLocation(), diag::warn_attribute_ignored) << Inline;
4015 Diag(Range.getBegin(), diag::note_conflicting_attribute);
4016 D->dropAttr<AlwaysInlineAttr>();
4018 if (MinSizeAttr *MinSize = D->getAttr<MinSizeAttr>()) {
4019 Diag(MinSize->getLocation(), diag::warn_attribute_ignored) << MinSize;
4020 Diag(Range.getBegin(), diag::note_conflicting_attribute);
4021 D->dropAttr<MinSizeAttr>();
4024 if (D->hasAttr<OptimizeNoneAttr>())
4027 return ::new (Context) OptimizeNoneAttr(Range, Context,
4028 AttrSpellingListIndex);
4031 static void handleAlwaysInlineAttr(Sema &S, Decl *D,
4032 const AttributeList &Attr) {
4033 if (checkAttrMutualExclusion<NotTailCalledAttr>(S, D, Attr.getRange(),
4037 if (AlwaysInlineAttr *Inline = S.mergeAlwaysInlineAttr(
4038 D, Attr.getRange(), Attr.getName(),
4039 Attr.getAttributeSpellingListIndex()))
4043 static void handleMinSizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4044 if (MinSizeAttr *MinSize = S.mergeMinSizeAttr(
4045 D, Attr.getRange(), Attr.getAttributeSpellingListIndex()))
4046 D->addAttr(MinSize);
4049 static void handleOptimizeNoneAttr(Sema &S, Decl *D,
4050 const AttributeList &Attr) {
4051 if (OptimizeNoneAttr *Optnone = S.mergeOptimizeNoneAttr(
4052 D, Attr.getRange(), Attr.getAttributeSpellingListIndex()))
4053 D->addAttr(Optnone);
4056 static void handleConstantAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4057 if (checkAttrMutualExclusion<CUDASharedAttr>(S, D, Attr.getRange(),
4060 auto *VD = cast<VarDecl>(D);
4061 if (!VD->hasGlobalStorage()) {
4062 S.Diag(Attr.getLoc(), diag::err_cuda_nonglobal_constant);
4065 D->addAttr(::new (S.Context) CUDAConstantAttr(
4066 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4069 static void handleSharedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4070 if (checkAttrMutualExclusion<CUDAConstantAttr>(S, D, Attr.getRange(),
4073 auto *VD = cast<VarDecl>(D);
4074 // extern __shared__ is only allowed on arrays with no length (e.g.
4076 if (VD->hasExternalStorage() && !isa<IncompleteArrayType>(VD->getType())) {
4077 S.Diag(Attr.getLoc(), diag::err_cuda_extern_shared) << VD;
4080 if (S.getLangOpts().CUDA && VD->hasLocalStorage() &&
4081 S.CUDADiagIfHostCode(Attr.getLoc(), diag::err_cuda_host_shared)
4082 << S.CurrentCUDATarget())
4084 D->addAttr(::new (S.Context) CUDASharedAttr(
4085 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4088 static void handleGlobalAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4089 if (checkAttrMutualExclusion<CUDADeviceAttr>(S, D, Attr.getRange(),
4091 checkAttrMutualExclusion<CUDAHostAttr>(S, D, Attr.getRange(),
4095 FunctionDecl *FD = cast<FunctionDecl>(D);
4096 if (!FD->getReturnType()->isVoidType()) {
4097 SourceRange RTRange = FD->getReturnTypeSourceRange();
4098 S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return)
4100 << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "void")
4104 if (const auto *Method = dyn_cast<CXXMethodDecl>(FD)) {
4105 if (Method->isInstance()) {
4106 S.Diag(Method->getLocStart(), diag::err_kern_is_nonstatic_method)
4110 S.Diag(Method->getLocStart(), diag::warn_kern_is_method) << Method;
4112 // Only warn for "inline" when compiling for host, to cut down on noise.
4113 if (FD->isInlineSpecified() && !S.getLangOpts().CUDAIsDevice)
4114 S.Diag(FD->getLocStart(), diag::warn_kern_is_inline) << FD;
4116 D->addAttr(::new (S.Context)
4117 CUDAGlobalAttr(Attr.getRange(), S.Context,
4118 Attr.getAttributeSpellingListIndex()));
4121 static void handleGNUInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4122 FunctionDecl *Fn = cast<FunctionDecl>(D);
4123 if (!Fn->isInlineSpecified()) {
4124 S.Diag(Attr.getLoc(), diag::warn_gnu_inline_attribute_requires_inline);
4128 D->addAttr(::new (S.Context)
4129 GNUInlineAttr(Attr.getRange(), S.Context,
4130 Attr.getAttributeSpellingListIndex()));
4133 static void handleCallConvAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4134 if (hasDeclarator(D)) return;
4136 // Diagnostic is emitted elsewhere: here we store the (valid) Attr
4137 // in the Decl node for syntactic reasoning, e.g., pretty-printing.
4139 if (S.CheckCallingConvAttr(Attr, CC, /*FD*/nullptr))
4142 if (!isa<ObjCMethodDecl>(D)) {
4143 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
4144 << Attr.getName() << ExpectedFunctionOrMethod;
4148 switch (Attr.getKind()) {
4149 case AttributeList::AT_FastCall:
4150 D->addAttr(::new (S.Context)
4151 FastCallAttr(Attr.getRange(), S.Context,
4152 Attr.getAttributeSpellingListIndex()));
4154 case AttributeList::AT_StdCall:
4155 D->addAttr(::new (S.Context)
4156 StdCallAttr(Attr.getRange(), S.Context,
4157 Attr.getAttributeSpellingListIndex()));
4159 case AttributeList::AT_ThisCall:
4160 D->addAttr(::new (S.Context)
4161 ThisCallAttr(Attr.getRange(), S.Context,
4162 Attr.getAttributeSpellingListIndex()));
4164 case AttributeList::AT_CDecl:
4165 D->addAttr(::new (S.Context)
4166 CDeclAttr(Attr.getRange(), S.Context,
4167 Attr.getAttributeSpellingListIndex()));
4169 case AttributeList::AT_Pascal:
4170 D->addAttr(::new (S.Context)
4171 PascalAttr(Attr.getRange(), S.Context,
4172 Attr.getAttributeSpellingListIndex()));
4174 case AttributeList::AT_SwiftCall:
4175 D->addAttr(::new (S.Context)
4176 SwiftCallAttr(Attr.getRange(), S.Context,
4177 Attr.getAttributeSpellingListIndex()));
4179 case AttributeList::AT_VectorCall:
4180 D->addAttr(::new (S.Context)
4181 VectorCallAttr(Attr.getRange(), S.Context,
4182 Attr.getAttributeSpellingListIndex()));
4184 case AttributeList::AT_MSABI:
4185 D->addAttr(::new (S.Context)
4186 MSABIAttr(Attr.getRange(), S.Context,
4187 Attr.getAttributeSpellingListIndex()));
4189 case AttributeList::AT_SysVABI:
4190 D->addAttr(::new (S.Context)
4191 SysVABIAttr(Attr.getRange(), S.Context,
4192 Attr.getAttributeSpellingListIndex()));
4194 case AttributeList::AT_RegCall:
4195 D->addAttr(::new (S.Context) RegCallAttr(
4196 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4198 case AttributeList::AT_Pcs: {
4199 PcsAttr::PCSType PCS;
4202 PCS = PcsAttr::AAPCS;
4205 PCS = PcsAttr::AAPCS_VFP;
4208 llvm_unreachable("unexpected calling convention in pcs attribute");
4211 D->addAttr(::new (S.Context)
4212 PcsAttr(Attr.getRange(), S.Context, PCS,
4213 Attr.getAttributeSpellingListIndex()));
4216 case AttributeList::AT_IntelOclBicc:
4217 D->addAttr(::new (S.Context)
4218 IntelOclBiccAttr(Attr.getRange(), S.Context,
4219 Attr.getAttributeSpellingListIndex()));
4221 case AttributeList::AT_PreserveMost:
4222 D->addAttr(::new (S.Context) PreserveMostAttr(
4223 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4225 case AttributeList::AT_PreserveAll:
4226 D->addAttr(::new (S.Context) PreserveAllAttr(
4227 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4230 llvm_unreachable("unexpected attribute kind");
4234 static void handleSuppressAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4235 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
4238 std::vector<StringRef> DiagnosticIdentifiers;
4239 for (unsigned I = 0, E = Attr.getNumArgs(); I != E; ++I) {
4242 if (!S.checkStringLiteralArgumentAttr(Attr, I, RuleName, nullptr))
4245 // FIXME: Warn if the rule name is unknown. This is tricky because only
4246 // clang-tidy knows about available rules.
4247 DiagnosticIdentifiers.push_back(RuleName);
4249 D->addAttr(::new (S.Context) SuppressAttr(
4250 Attr.getRange(), S.Context, DiagnosticIdentifiers.data(),
4251 DiagnosticIdentifiers.size(), Attr.getAttributeSpellingListIndex()));
4254 bool Sema::CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC,
4255 const FunctionDecl *FD) {
4256 if (attr.isInvalid())
4259 if (attr.hasProcessingCache()) {
4260 CC = (CallingConv) attr.getProcessingCache();
4264 unsigned ReqArgs = attr.getKind() == AttributeList::AT_Pcs ? 1 : 0;
4265 if (!checkAttributeNumArgs(*this, attr, ReqArgs)) {
4270 // TODO: diagnose uses of these conventions on the wrong target.
4271 switch (attr.getKind()) {
4272 case AttributeList::AT_CDecl: CC = CC_C; break;
4273 case AttributeList::AT_FastCall: CC = CC_X86FastCall; break;
4274 case AttributeList::AT_StdCall: CC = CC_X86StdCall; break;
4275 case AttributeList::AT_ThisCall: CC = CC_X86ThisCall; break;
4276 case AttributeList::AT_Pascal: CC = CC_X86Pascal; break;
4277 case AttributeList::AT_SwiftCall: CC = CC_Swift; break;
4278 case AttributeList::AT_VectorCall: CC = CC_X86VectorCall; break;
4279 case AttributeList::AT_RegCall: CC = CC_X86RegCall; break;
4280 case AttributeList::AT_MSABI:
4281 CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_C :
4284 case AttributeList::AT_SysVABI:
4285 CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_X86_64SysV :
4288 case AttributeList::AT_Pcs: {
4290 if (!checkStringLiteralArgumentAttr(attr, 0, StrRef)) {
4294 if (StrRef == "aapcs") {
4297 } else if (StrRef == "aapcs-vfp") {
4303 Diag(attr.getLoc(), diag::err_invalid_pcs);
4306 case AttributeList::AT_IntelOclBicc: CC = CC_IntelOclBicc; break;
4307 case AttributeList::AT_PreserveMost: CC = CC_PreserveMost; break;
4308 case AttributeList::AT_PreserveAll: CC = CC_PreserveAll; break;
4309 default: llvm_unreachable("unexpected attribute kind");
4312 const TargetInfo &TI = Context.getTargetInfo();
4313 TargetInfo::CallingConvCheckResult A = TI.checkCallingConvention(CC);
4314 if (A != TargetInfo::CCCR_OK) {
4315 if (A == TargetInfo::CCCR_Warning)
4316 Diag(attr.getLoc(), diag::warn_cconv_ignored) << attr.getName();
4318 // This convention is not valid for the target. Use the default function or
4319 // method calling convention.
4320 bool IsCXXMethod = false, IsVariadic = false;
4322 IsCXXMethod = FD->isCXXInstanceMember();
4323 IsVariadic = FD->isVariadic();
4325 CC = Context.getDefaultCallingConvention(IsVariadic, IsCXXMethod);
4328 attr.setProcessingCache((unsigned) CC);
4332 /// Pointer-like types in the default address space.
4333 static bool isValidSwiftContextType(QualType type) {
4334 if (!type->hasPointerRepresentation())
4335 return type->isDependentType();
4336 return type->getPointeeType().getAddressSpace() == 0;
4339 /// Pointers and references in the default address space.
4340 static bool isValidSwiftIndirectResultType(QualType type) {
4341 if (auto ptrType = type->getAs<PointerType>()) {
4342 type = ptrType->getPointeeType();
4343 } else if (auto refType = type->getAs<ReferenceType>()) {
4344 type = refType->getPointeeType();
4346 return type->isDependentType();
4348 return type.getAddressSpace() == 0;
4351 /// Pointers and references to pointers in the default address space.
4352 static bool isValidSwiftErrorResultType(QualType type) {
4353 if (auto ptrType = type->getAs<PointerType>()) {
4354 type = ptrType->getPointeeType();
4355 } else if (auto refType = type->getAs<ReferenceType>()) {
4356 type = refType->getPointeeType();
4358 return type->isDependentType();
4360 if (!type.getQualifiers().empty())
4362 return isValidSwiftContextType(type);
4365 static void handleParameterABIAttr(Sema &S, Decl *D, const AttributeList &attr,
4367 S.AddParameterABIAttr(attr.getRange(), D, abi,
4368 attr.getAttributeSpellingListIndex());
4371 void Sema::AddParameterABIAttr(SourceRange range, Decl *D, ParameterABI abi,
4372 unsigned spellingIndex) {
4374 QualType type = cast<ParmVarDecl>(D)->getType();
4376 if (auto existingAttr = D->getAttr<ParameterABIAttr>()) {
4377 if (existingAttr->getABI() != abi) {
4378 Diag(range.getBegin(), diag::err_attributes_are_not_compatible)
4379 << getParameterABISpelling(abi) << existingAttr;
4380 Diag(existingAttr->getLocation(), diag::note_conflicting_attribute);
4386 case ParameterABI::Ordinary:
4387 llvm_unreachable("explicit attribute for ordinary parameter ABI?");
4389 case ParameterABI::SwiftContext:
4390 if (!isValidSwiftContextType(type)) {
4391 Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
4392 << getParameterABISpelling(abi)
4393 << /*pointer to pointer */ 0 << type;
4395 D->addAttr(::new (Context)
4396 SwiftContextAttr(range, Context, spellingIndex));
4399 case ParameterABI::SwiftErrorResult:
4400 if (!isValidSwiftErrorResultType(type)) {
4401 Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
4402 << getParameterABISpelling(abi)
4403 << /*pointer to pointer */ 1 << type;
4405 D->addAttr(::new (Context)
4406 SwiftErrorResultAttr(range, Context, spellingIndex));
4409 case ParameterABI::SwiftIndirectResult:
4410 if (!isValidSwiftIndirectResultType(type)) {
4411 Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
4412 << getParameterABISpelling(abi)
4413 << /*pointer*/ 0 << type;
4415 D->addAttr(::new (Context)
4416 SwiftIndirectResultAttr(range, Context, spellingIndex));
4419 llvm_unreachable("bad parameter ABI attribute");
4422 /// Checks a regparm attribute, returning true if it is ill-formed and
4423 /// otherwise setting numParams to the appropriate value.
4424 bool Sema::CheckRegparmAttr(const AttributeList &Attr, unsigned &numParams) {
4425 if (Attr.isInvalid())
4428 if (!checkAttributeNumArgs(*this, Attr, 1)) {
4434 Expr *NumParamsExpr = Attr.getArgAsExpr(0);
4435 if (!checkUInt32Argument(*this, Attr, NumParamsExpr, NP)) {
4440 if (Context.getTargetInfo().getRegParmMax() == 0) {
4441 Diag(Attr.getLoc(), diag::err_attribute_regparm_wrong_platform)
4442 << NumParamsExpr->getSourceRange();
4448 if (numParams > Context.getTargetInfo().getRegParmMax()) {
4449 Diag(Attr.getLoc(), diag::err_attribute_regparm_invalid_number)
4450 << Context.getTargetInfo().getRegParmMax() << NumParamsExpr->getSourceRange();
4458 // Checks whether an argument of launch_bounds attribute is
4459 // acceptable, performs implicit conversion to Rvalue, and returns
4460 // non-nullptr Expr result on success. Otherwise, it returns nullptr
4461 // and may output an error.
4462 static Expr *makeLaunchBoundsArgExpr(Sema &S, Expr *E,
4463 const CUDALaunchBoundsAttr &Attr,
4464 const unsigned Idx) {
4465 if (S.DiagnoseUnexpandedParameterPack(E))
4468 // Accept template arguments for now as they depend on something else.
4469 // We'll get to check them when they eventually get instantiated.
4470 if (E->isValueDependent())
4474 if (!E->isIntegerConstantExpr(I, S.Context)) {
4475 S.Diag(E->getExprLoc(), diag::err_attribute_argument_n_type)
4476 << &Attr << Idx << AANT_ArgumentIntegerConstant << E->getSourceRange();
4479 // Make sure we can fit it in 32 bits.
4480 if (!I.isIntN(32)) {
4481 S.Diag(E->getExprLoc(), diag::err_ice_too_large) << I.toString(10, false)
4482 << 32 << /* Unsigned */ 1;
4486 S.Diag(E->getExprLoc(), diag::warn_attribute_argument_n_negative)
4487 << &Attr << Idx << E->getSourceRange();
4489 // We may need to perform implicit conversion of the argument.
4490 InitializedEntity Entity = InitializedEntity::InitializeParameter(
4491 S.Context, S.Context.getConstType(S.Context.IntTy), /*consume*/ false);
4492 ExprResult ValArg = S.PerformCopyInitialization(Entity, SourceLocation(), E);
4493 assert(!ValArg.isInvalid() &&
4494 "Unexpected PerformCopyInitialization() failure.");
4496 return ValArg.getAs<Expr>();
4499 void Sema::AddLaunchBoundsAttr(SourceRange AttrRange, Decl *D, Expr *MaxThreads,
4500 Expr *MinBlocks, unsigned SpellingListIndex) {
4501 CUDALaunchBoundsAttr TmpAttr(AttrRange, Context, MaxThreads, MinBlocks,
4503 MaxThreads = makeLaunchBoundsArgExpr(*this, MaxThreads, TmpAttr, 0);
4504 if (MaxThreads == nullptr)
4508 MinBlocks = makeLaunchBoundsArgExpr(*this, MinBlocks, TmpAttr, 1);
4509 if (MinBlocks == nullptr)
4513 D->addAttr(::new (Context) CUDALaunchBoundsAttr(
4514 AttrRange, Context, MaxThreads, MinBlocks, SpellingListIndex));
4517 static void handleLaunchBoundsAttr(Sema &S, Decl *D,
4518 const AttributeList &Attr) {
4519 if (!checkAttributeAtLeastNumArgs(S, Attr, 1) ||
4520 !checkAttributeAtMostNumArgs(S, Attr, 2))
4523 S.AddLaunchBoundsAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
4524 Attr.getNumArgs() > 1 ? Attr.getArgAsExpr(1) : nullptr,
4525 Attr.getAttributeSpellingListIndex());
4528 static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
4529 const AttributeList &Attr) {
4530 if (!Attr.isArgIdent(0)) {
4531 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
4532 << Attr.getName() << /* arg num = */ 1 << AANT_ArgumentIdentifier;
4536 if (!checkAttributeNumArgs(S, Attr, 3))
4539 IdentifierInfo *ArgumentKind = Attr.getArgAsIdent(0)->Ident;
4541 if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) {
4542 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
4543 << Attr.getName() << ExpectedFunctionOrMethod;
4547 uint64_t ArgumentIdx;
4548 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 2, Attr.getArgAsExpr(1),
4552 uint64_t TypeTagIdx;
4553 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 3, Attr.getArgAsExpr(2),
4557 bool IsPointer = (Attr.getName()->getName() == "pointer_with_type_tag");
4559 // Ensure that buffer has a pointer type.
4560 QualType BufferTy = getFunctionOrMethodParamType(D, ArgumentIdx);
4561 if (!BufferTy->isPointerType()) {
4562 S.Diag(Attr.getLoc(), diag::err_attribute_pointers_only)
4563 << Attr.getName() << 0;
4567 D->addAttr(::new (S.Context)
4568 ArgumentWithTypeTagAttr(Attr.getRange(), S.Context, ArgumentKind,
4569 ArgumentIdx, TypeTagIdx, IsPointer,
4570 Attr.getAttributeSpellingListIndex()));
4573 static void handleTypeTagForDatatypeAttr(Sema &S, Decl *D,
4574 const AttributeList &Attr) {
4575 if (!Attr.isArgIdent(0)) {
4576 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
4577 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
4581 if (!checkAttributeNumArgs(S, Attr, 1))
4584 if (!isa<VarDecl>(D)) {
4585 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
4586 << Attr.getName() << ExpectedVariable;
4590 IdentifierInfo *PointerKind = Attr.getArgAsIdent(0)->Ident;
4591 TypeSourceInfo *MatchingCTypeLoc = nullptr;
4592 S.GetTypeFromParser(Attr.getMatchingCType(), &MatchingCTypeLoc);
4593 assert(MatchingCTypeLoc && "no type source info for attribute argument");
4595 D->addAttr(::new (S.Context)
4596 TypeTagForDatatypeAttr(Attr.getRange(), S.Context, PointerKind,
4598 Attr.getLayoutCompatible(),
4599 Attr.getMustBeNull(),
4600 Attr.getAttributeSpellingListIndex()));
4603 static void handleXRayLogArgsAttr(Sema &S, Decl *D,
4604 const AttributeList &Attr) {
4606 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 1, Attr.getArgAsExpr(0),
4610 // ArgCount isn't a parameter index [0;n), it's a count [1;n] - hence + 1.
4611 D->addAttr(::new (S.Context)
4612 XRayLogArgsAttr(Attr.getRange(), S.Context, ++ArgCount,
4613 Attr.getAttributeSpellingListIndex()));
4616 //===----------------------------------------------------------------------===//
4617 // Checker-specific attribute handlers.
4618 //===----------------------------------------------------------------------===//
4620 static bool isValidSubjectOfNSReturnsRetainedAttribute(QualType type) {
4621 return type->isDependentType() ||
4622 type->isObjCRetainableType();
4625 static bool isValidSubjectOfNSAttribute(Sema &S, QualType type) {
4626 return type->isDependentType() ||
4627 type->isObjCObjectPointerType() ||
4628 S.Context.isObjCNSObjectType(type);
4631 static bool isValidSubjectOfCFAttribute(Sema &S, QualType type) {
4632 return type->isDependentType() ||
4633 type->isPointerType() ||
4634 isValidSubjectOfNSAttribute(S, type);
4637 static void handleNSConsumedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4638 S.AddNSConsumedAttr(Attr.getRange(), D, Attr.getAttributeSpellingListIndex(),
4639 Attr.getKind() == AttributeList::AT_NSConsumed,
4640 /*template instantiation*/ false);
4643 void Sema::AddNSConsumedAttr(SourceRange attrRange, Decl *D,
4644 unsigned spellingIndex, bool isNSConsumed,
4645 bool isTemplateInstantiation) {
4646 ParmVarDecl *param = cast<ParmVarDecl>(D);
4650 typeOK = isValidSubjectOfNSAttribute(*this, param->getType());
4652 typeOK = isValidSubjectOfCFAttribute(*this, param->getType());
4656 // These attributes are normally just advisory, but in ARC, ns_consumed
4657 // is significant. Allow non-dependent code to contain inappropriate
4658 // attributes even in ARC, but require template instantiations to be
4659 // set up correctly.
4660 Diag(D->getLocStart(),
4661 (isTemplateInstantiation && isNSConsumed &&
4662 getLangOpts().ObjCAutoRefCount
4663 ? diag::err_ns_attribute_wrong_parameter_type
4664 : diag::warn_ns_attribute_wrong_parameter_type))
4666 << (isNSConsumed ? "ns_consumed" : "cf_consumed")
4667 << (isNSConsumed ? /*objc pointers*/ 0 : /*cf pointers*/ 1);
4672 param->addAttr(::new (Context)
4673 NSConsumedAttr(attrRange, Context, spellingIndex));
4675 param->addAttr(::new (Context)
4676 CFConsumedAttr(attrRange, Context, spellingIndex));
4679 static void handleNSReturnsRetainedAttr(Sema &S, Decl *D,
4680 const AttributeList &Attr) {
4681 QualType returnType;
4683 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
4684 returnType = MD->getReturnType();
4685 else if (S.getLangOpts().ObjCAutoRefCount && hasDeclarator(D) &&
4686 (Attr.getKind() == AttributeList::AT_NSReturnsRetained))
4687 return; // ignore: was handled as a type attribute
4688 else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D))
4689 returnType = PD->getType();
4690 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
4691 returnType = FD->getReturnType();
4692 else if (auto *Param = dyn_cast<ParmVarDecl>(D)) {
4693 returnType = Param->getType()->getPointeeType();
4694 if (returnType.isNull()) {
4695 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type)
4696 << Attr.getName() << /*pointer-to-CF*/2
4701 AttributeDeclKind ExpectedDeclKind;
4702 switch (Attr.getKind()) {
4703 default: llvm_unreachable("invalid ownership attribute");
4704 case AttributeList::AT_NSReturnsRetained:
4705 case AttributeList::AT_NSReturnsAutoreleased:
4706 case AttributeList::AT_NSReturnsNotRetained:
4707 ExpectedDeclKind = ExpectedFunctionOrMethod;
4710 case AttributeList::AT_CFReturnsRetained:
4711 case AttributeList::AT_CFReturnsNotRetained:
4712 ExpectedDeclKind = ExpectedFunctionMethodOrParameter;
4715 S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type)
4716 << Attr.getRange() << Attr.getName() << ExpectedDeclKind;
4722 switch (Attr.getKind()) {
4723 default: llvm_unreachable("invalid ownership attribute");
4724 case AttributeList::AT_NSReturnsRetained:
4725 typeOK = isValidSubjectOfNSReturnsRetainedAttribute(returnType);
4729 case AttributeList::AT_NSReturnsAutoreleased:
4730 case AttributeList::AT_NSReturnsNotRetained:
4731 typeOK = isValidSubjectOfNSAttribute(S, returnType);
4735 case AttributeList::AT_CFReturnsRetained:
4736 case AttributeList::AT_CFReturnsNotRetained:
4737 typeOK = isValidSubjectOfCFAttribute(S, returnType);
4743 if (isa<ParmVarDecl>(D)) {
4744 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type)
4745 << Attr.getName() << /*pointer-to-CF*/2
4748 // Needs to be kept in sync with warn_ns_attribute_wrong_return_type.
4753 } SubjectKind = Function;
4754 if (isa<ObjCMethodDecl>(D))
4755 SubjectKind = Method;
4756 else if (isa<ObjCPropertyDecl>(D))
4757 SubjectKind = Property;
4758 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
4759 << Attr.getName() << SubjectKind << cf
4765 switch (Attr.getKind()) {
4767 llvm_unreachable("invalid ownership attribute");
4768 case AttributeList::AT_NSReturnsAutoreleased:
4769 D->addAttr(::new (S.Context) NSReturnsAutoreleasedAttr(
4770 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4772 case AttributeList::AT_CFReturnsNotRetained:
4773 D->addAttr(::new (S.Context) CFReturnsNotRetainedAttr(
4774 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4776 case AttributeList::AT_NSReturnsNotRetained:
4777 D->addAttr(::new (S.Context) NSReturnsNotRetainedAttr(
4778 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4780 case AttributeList::AT_CFReturnsRetained:
4781 D->addAttr(::new (S.Context) CFReturnsRetainedAttr(
4782 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4784 case AttributeList::AT_NSReturnsRetained:
4785 D->addAttr(::new (S.Context) NSReturnsRetainedAttr(
4786 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4791 static void handleObjCReturnsInnerPointerAttr(Sema &S, Decl *D,
4792 const AttributeList &attr) {
4793 const int EP_ObjCMethod = 1;
4794 const int EP_ObjCProperty = 2;
4796 SourceLocation loc = attr.getLoc();
4797 QualType resultType;
4798 if (isa<ObjCMethodDecl>(D))
4799 resultType = cast<ObjCMethodDecl>(D)->getReturnType();
4801 resultType = cast<ObjCPropertyDecl>(D)->getType();
4803 if (!resultType->isReferenceType() &&
4804 (!resultType->isPointerType() || resultType->isObjCRetainableType())) {
4805 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
4808 << (isa<ObjCMethodDecl>(D) ? EP_ObjCMethod : EP_ObjCProperty)
4809 << /*non-retainable pointer*/ 2;
4811 // Drop the attribute.
4815 D->addAttr(::new (S.Context) ObjCReturnsInnerPointerAttr(
4816 attr.getRange(), S.Context, attr.getAttributeSpellingListIndex()));
4819 static void handleObjCRequiresSuperAttr(Sema &S, Decl *D,
4820 const AttributeList &attr) {
4821 ObjCMethodDecl *method = cast<ObjCMethodDecl>(D);
4823 DeclContext *DC = method->getDeclContext();
4824 if (const ObjCProtocolDecl *PDecl = dyn_cast_or_null<ObjCProtocolDecl>(DC)) {
4825 S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol)
4826 << attr.getName() << 0;
4827 S.Diag(PDecl->getLocation(), diag::note_protocol_decl);
4830 if (method->getMethodFamily() == OMF_dealloc) {
4831 S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol)
4832 << attr.getName() << 1;
4836 method->addAttr(::new (S.Context)
4837 ObjCRequiresSuperAttr(attr.getRange(), S.Context,
4838 attr.getAttributeSpellingListIndex()));
4841 static void handleCFAuditedTransferAttr(Sema &S, Decl *D,
4842 const AttributeList &Attr) {
4843 if (checkAttrMutualExclusion<CFUnknownTransferAttr>(S, D, Attr.getRange(),
4847 D->addAttr(::new (S.Context)
4848 CFAuditedTransferAttr(Attr.getRange(), S.Context,
4849 Attr.getAttributeSpellingListIndex()));
4852 static void handleCFUnknownTransferAttr(Sema &S, Decl *D,
4853 const AttributeList &Attr) {
4854 if (checkAttrMutualExclusion<CFAuditedTransferAttr>(S, D, Attr.getRange(),
4858 D->addAttr(::new (S.Context)
4859 CFUnknownTransferAttr(Attr.getRange(), S.Context,
4860 Attr.getAttributeSpellingListIndex()));
4863 static void handleObjCBridgeAttr(Sema &S, Scope *Sc, Decl *D,
4864 const AttributeList &Attr) {
4865 IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr;
4868 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
4872 // Typedefs only allow objc_bridge(id) and have some additional checking.
4873 if (auto TD = dyn_cast<TypedefNameDecl>(D)) {
4874 if (!Parm->Ident->isStr("id")) {
4875 S.Diag(Attr.getLoc(), diag::err_objc_attr_typedef_not_id)
4880 // Only allow 'cv void *'.
4881 QualType T = TD->getUnderlyingType();
4882 if (!T->isVoidPointerType()) {
4883 S.Diag(Attr.getLoc(), diag::err_objc_attr_typedef_not_void_pointer);
4888 D->addAttr(::new (S.Context)
4889 ObjCBridgeAttr(Attr.getRange(), S.Context, Parm->Ident,
4890 Attr.getAttributeSpellingListIndex()));
4893 static void handleObjCBridgeMutableAttr(Sema &S, Scope *Sc, Decl *D,
4894 const AttributeList &Attr) {
4895 IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr;
4898 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
4902 D->addAttr(::new (S.Context)
4903 ObjCBridgeMutableAttr(Attr.getRange(), S.Context, Parm->Ident,
4904 Attr.getAttributeSpellingListIndex()));
4907 static void handleObjCBridgeRelatedAttr(Sema &S, Scope *Sc, Decl *D,
4908 const AttributeList &Attr) {
4909 IdentifierInfo *RelatedClass =
4910 Attr.isArgIdent(0) ? Attr.getArgAsIdent(0)->Ident : nullptr;
4911 if (!RelatedClass) {
4912 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
4915 IdentifierInfo *ClassMethod =
4916 Attr.getArgAsIdent(1) ? Attr.getArgAsIdent(1)->Ident : nullptr;
4917 IdentifierInfo *InstanceMethod =
4918 Attr.getArgAsIdent(2) ? Attr.getArgAsIdent(2)->Ident : nullptr;
4919 D->addAttr(::new (S.Context)
4920 ObjCBridgeRelatedAttr(Attr.getRange(), S.Context, RelatedClass,
4921 ClassMethod, InstanceMethod,
4922 Attr.getAttributeSpellingListIndex()));
4925 static void handleObjCDesignatedInitializer(Sema &S, Decl *D,
4926 const AttributeList &Attr) {
4927 ObjCInterfaceDecl *IFace;
4928 if (ObjCCategoryDecl *CatDecl =
4929 dyn_cast<ObjCCategoryDecl>(D->getDeclContext()))
4930 IFace = CatDecl->getClassInterface();
4932 IFace = cast<ObjCInterfaceDecl>(D->getDeclContext());
4937 IFace->setHasDesignatedInitializers();
4938 D->addAttr(::new (S.Context)
4939 ObjCDesignatedInitializerAttr(Attr.getRange(), S.Context,
4940 Attr.getAttributeSpellingListIndex()));
4943 static void handleObjCRuntimeName(Sema &S, Decl *D,
4944 const AttributeList &Attr) {
4945 StringRef MetaDataName;
4946 if (!S.checkStringLiteralArgumentAttr(Attr, 0, MetaDataName))
4948 D->addAttr(::new (S.Context)
4949 ObjCRuntimeNameAttr(Attr.getRange(), S.Context,
4951 Attr.getAttributeSpellingListIndex()));
4954 // When a user wants to use objc_boxable with a union or struct
4955 // but they don't have access to the declaration (legacy/third-party code)
4956 // then they can 'enable' this feature with a typedef:
4957 // typedef struct __attribute((objc_boxable)) legacy_struct legacy_struct;
4958 static void handleObjCBoxable(Sema &S, Decl *D, const AttributeList &Attr) {
4959 bool notify = false;
4961 RecordDecl *RD = dyn_cast<RecordDecl>(D);
4962 if (RD && RD->getDefinition()) {
4963 RD = RD->getDefinition();
4968 ObjCBoxableAttr *BoxableAttr = ::new (S.Context)
4969 ObjCBoxableAttr(Attr.getRange(), S.Context,
4970 Attr.getAttributeSpellingListIndex());
4971 RD->addAttr(BoxableAttr);
4973 // we need to notify ASTReader/ASTWriter about
4974 // modification of existing declaration
4975 if (ASTMutationListener *L = S.getASTMutationListener())
4976 L->AddedAttributeToRecord(BoxableAttr, RD);
4981 static void handleObjCOwnershipAttr(Sema &S, Decl *D,
4982 const AttributeList &Attr) {
4983 if (hasDeclarator(D)) return;
4985 S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type)
4986 << Attr.getRange() << Attr.getName() << ExpectedVariable;
4989 static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D,
4990 const AttributeList &Attr) {
4991 ValueDecl *vd = cast<ValueDecl>(D);
4992 QualType type = vd->getType();
4994 if (!type->isDependentType() &&
4995 !type->isObjCLifetimeType()) {
4996 S.Diag(Attr.getLoc(), diag::err_objc_precise_lifetime_bad_type)
5001 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
5003 // If we have no lifetime yet, check the lifetime we're presumably
5005 if (lifetime == Qualifiers::OCL_None && !type->isDependentType())
5006 lifetime = type->getObjCARCImplicitLifetime();
5009 case Qualifiers::OCL_None:
5010 assert(type->isDependentType() &&
5011 "didn't infer lifetime for non-dependent type?");
5014 case Qualifiers::OCL_Weak: // meaningful
5015 case Qualifiers::OCL_Strong: // meaningful
5018 case Qualifiers::OCL_ExplicitNone:
5019 case Qualifiers::OCL_Autoreleasing:
5020 S.Diag(Attr.getLoc(), diag::warn_objc_precise_lifetime_meaningless)
5021 << (lifetime == Qualifiers::OCL_Autoreleasing);
5025 D->addAttr(::new (S.Context)
5026 ObjCPreciseLifetimeAttr(Attr.getRange(), S.Context,
5027 Attr.getAttributeSpellingListIndex()));
5030 //===----------------------------------------------------------------------===//
5031 // Microsoft specific attribute handlers.
5032 //===----------------------------------------------------------------------===//
5034 UuidAttr *Sema::mergeUuidAttr(Decl *D, SourceRange Range,
5035 unsigned AttrSpellingListIndex, StringRef Uuid) {
5036 if (const auto *UA = D->getAttr<UuidAttr>()) {
5037 if (UA->getGuid().equals_lower(Uuid))
5039 Diag(UA->getLocation(), diag::err_mismatched_uuid);
5040 Diag(Range.getBegin(), diag::note_previous_uuid);
5041 D->dropAttr<UuidAttr>();
5044 return ::new (Context) UuidAttr(Range, Context, Uuid, AttrSpellingListIndex);
5047 static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5048 if (!S.LangOpts.CPlusPlus) {
5049 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
5050 << Attr.getName() << AttributeLangSupport::C;
5055 SourceLocation LiteralLoc;
5056 if (!S.checkStringLiteralArgumentAttr(Attr, 0, StrRef, &LiteralLoc))
5059 // GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or
5060 // "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}", normalize to the former.
5061 if (StrRef.size() == 38 && StrRef.front() == '{' && StrRef.back() == '}')
5062 StrRef = StrRef.drop_front().drop_back();
5064 // Validate GUID length.
5065 if (StrRef.size() != 36) {
5066 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
5070 for (unsigned i = 0; i < 36; ++i) {
5071 if (i == 8 || i == 13 || i == 18 || i == 23) {
5072 if (StrRef[i] != '-') {
5073 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
5076 } else if (!isHexDigit(StrRef[i])) {
5077 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
5082 // FIXME: It'd be nice to also emit a fixit removing uuid(...) (and, if it's
5083 // the only thing in the [] list, the [] too), and add an insertion of
5084 // __declspec(uuid(...)). But sadly, neither the SourceLocs of the commas
5085 // separating attributes nor of the [ and the ] are in the AST.
5086 // Cf "SourceLocations of attribute list delimiters - [[ ... , ... ]] etc"
5088 if (Attr.isMicrosoftAttribute()) // Check for [uuid(...)] spelling.
5089 S.Diag(Attr.getLoc(), diag::warn_atl_uuid_deprecated);
5091 UuidAttr *UA = S.mergeUuidAttr(D, Attr.getRange(),
5092 Attr.getAttributeSpellingListIndex(), StrRef);
5097 static void handleMSInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5098 if (!S.LangOpts.CPlusPlus) {
5099 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
5100 << Attr.getName() << AttributeLangSupport::C;
5103 MSInheritanceAttr *IA = S.mergeMSInheritanceAttr(
5104 D, Attr.getRange(), /*BestCase=*/true,
5105 Attr.getAttributeSpellingListIndex(),
5106 (MSInheritanceAttr::Spelling)Attr.getSemanticSpelling());
5109 S.Consumer.AssignInheritanceModel(cast<CXXRecordDecl>(D));
5113 static void handleDeclspecThreadAttr(Sema &S, Decl *D,
5114 const AttributeList &Attr) {
5115 VarDecl *VD = cast<VarDecl>(D);
5116 if (!S.Context.getTargetInfo().isTLSSupported()) {
5117 S.Diag(Attr.getLoc(), diag::err_thread_unsupported);
5120 if (VD->getTSCSpec() != TSCS_unspecified) {
5121 S.Diag(Attr.getLoc(), diag::err_declspec_thread_on_thread_variable);
5124 if (VD->hasLocalStorage()) {
5125 S.Diag(Attr.getLoc(), diag::err_thread_non_global) << "__declspec(thread)";
5128 VD->addAttr(::new (S.Context) ThreadAttr(
5129 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
5132 static void handleAbiTagAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5133 SmallVector<StringRef, 4> Tags;
5134 for (unsigned I = 0, E = Attr.getNumArgs(); I != E; ++I) {
5136 if (!S.checkStringLiteralArgumentAttr(Attr, I, Tag))
5138 Tags.push_back(Tag);
5141 if (const auto *NS = dyn_cast<NamespaceDecl>(D)) {
5142 if (!NS->isInline()) {
5143 S.Diag(Attr.getLoc(), diag::warn_attr_abi_tag_namespace) << 0;
5146 if (NS->isAnonymousNamespace()) {
5147 S.Diag(Attr.getLoc(), diag::warn_attr_abi_tag_namespace) << 1;
5150 if (Attr.getNumArgs() == 0)
5151 Tags.push_back(NS->getName());
5152 } else if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
5155 // Store tags sorted and without duplicates.
5156 std::sort(Tags.begin(), Tags.end());
5157 Tags.erase(std::unique(Tags.begin(), Tags.end()), Tags.end());
5159 D->addAttr(::new (S.Context)
5160 AbiTagAttr(Attr.getRange(), S.Context, Tags.data(), Tags.size(),
5161 Attr.getAttributeSpellingListIndex()));
5164 static void handleARMInterruptAttr(Sema &S, Decl *D,
5165 const AttributeList &Attr) {
5166 // Check the attribute arguments.
5167 if (Attr.getNumArgs() > 1) {
5168 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
5169 << Attr.getName() << 1;
5174 SourceLocation ArgLoc;
5176 if (Attr.getNumArgs() == 0)
5178 else if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &ArgLoc))
5181 ARMInterruptAttr::InterruptType Kind;
5182 if (!ARMInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
5183 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
5184 << Attr.getName() << Str << ArgLoc;
5188 unsigned Index = Attr.getAttributeSpellingListIndex();
5189 D->addAttr(::new (S.Context)
5190 ARMInterruptAttr(Attr.getLoc(), S.Context, Kind, Index));
5193 static void handleMSP430InterruptAttr(Sema &S, Decl *D,
5194 const AttributeList &Attr) {
5195 if (!checkAttributeNumArgs(S, Attr, 1))
5198 if (!Attr.isArgExpr(0)) {
5199 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName()
5200 << AANT_ArgumentIntegerConstant;
5204 // FIXME: Check for decl - it should be void ()(void).
5206 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
5207 llvm::APSInt NumParams(32);
5208 if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) {
5209 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
5210 << Attr.getName() << AANT_ArgumentIntegerConstant
5211 << NumParamsExpr->getSourceRange();
5215 unsigned Num = NumParams.getLimitedValue(255);
5216 if ((Num & 1) || Num > 30) {
5217 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
5218 << Attr.getName() << (int)NumParams.getSExtValue()
5219 << NumParamsExpr->getSourceRange();
5223 D->addAttr(::new (S.Context)
5224 MSP430InterruptAttr(Attr.getLoc(), S.Context, Num,
5225 Attr.getAttributeSpellingListIndex()));
5226 D->addAttr(UsedAttr::CreateImplicit(S.Context));
5229 static void handleMipsInterruptAttr(Sema &S, Decl *D,
5230 const AttributeList &Attr) {
5231 // Only one optional argument permitted.
5232 if (Attr.getNumArgs() > 1) {
5233 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
5234 << Attr.getName() << 1;
5239 SourceLocation ArgLoc;
5241 if (Attr.getNumArgs() == 0)
5243 else if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &ArgLoc))
5246 // Semantic checks for a function with the 'interrupt' attribute for MIPS:
5247 // a) Must be a function.
5248 // b) Must have no parameters.
5249 // c) Must have the 'void' return type.
5250 // d) Cannot have the 'mips16' attribute, as that instruction set
5251 // lacks the 'eret' instruction.
5252 // e) The attribute itself must either have no argument or one of the
5253 // valid interrupt types, see [MipsInterruptDocs].
5255 if (!isFunctionOrMethod(D)) {
5256 S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
5257 << "'interrupt'" << ExpectedFunctionOrMethod;
5261 if (hasFunctionProto(D) && getFunctionOrMethodNumParams(D) != 0) {
5262 S.Diag(D->getLocation(), diag::warn_mips_interrupt_attribute)
5267 if (!getFunctionOrMethodResultType(D)->isVoidType()) {
5268 S.Diag(D->getLocation(), diag::warn_mips_interrupt_attribute)
5273 if (checkAttrMutualExclusion<Mips16Attr>(S, D, Attr.getRange(),
5277 MipsInterruptAttr::InterruptType Kind;
5278 if (!MipsInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
5279 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
5280 << Attr.getName() << "'" + std::string(Str) + "'";
5284 D->addAttr(::new (S.Context) MipsInterruptAttr(
5285 Attr.getLoc(), S.Context, Kind, Attr.getAttributeSpellingListIndex()));
5288 static void handleAnyX86InterruptAttr(Sema &S, Decl *D,
5289 const AttributeList &Attr) {
5290 // Semantic checks for a function with the 'interrupt' attribute.
5291 // a) Must be a function.
5292 // b) Must have the 'void' return type.
5293 // c) Must take 1 or 2 arguments.
5294 // d) The 1st argument must be a pointer.
5295 // e) The 2nd argument (if any) must be an unsigned integer.
5296 if (!isFunctionOrMethod(D) || !hasFunctionProto(D) || isInstanceMethod(D) ||
5297 CXXMethodDecl::isStaticOverloadedOperator(
5298 cast<NamedDecl>(D)->getDeclName().getCXXOverloadedOperator())) {
5299 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
5300 << Attr.getName() << ExpectedFunctionWithProtoType;
5303 // Interrupt handler must have void return type.
5304 if (!getFunctionOrMethodResultType(D)->isVoidType()) {
5305 S.Diag(getFunctionOrMethodResultSourceRange(D).getBegin(),
5306 diag::err_anyx86_interrupt_attribute)
5307 << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
5313 // Interrupt handler must have 1 or 2 parameters.
5314 unsigned NumParams = getFunctionOrMethodNumParams(D);
5315 if (NumParams < 1 || NumParams > 2) {
5316 S.Diag(D->getLocStart(), diag::err_anyx86_interrupt_attribute)
5317 << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
5323 // The first argument must be a pointer.
5324 if (!getFunctionOrMethodParamType(D, 0)->isPointerType()) {
5325 S.Diag(getFunctionOrMethodParamRange(D, 0).getBegin(),
5326 diag::err_anyx86_interrupt_attribute)
5327 << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
5333 // The second argument, if present, must be an unsigned integer.
5335 S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86_64
5338 if (NumParams == 2 &&
5339 (!getFunctionOrMethodParamType(D, 1)->isUnsignedIntegerType() ||
5340 S.Context.getTypeSize(getFunctionOrMethodParamType(D, 1)) != TypeSize)) {
5341 S.Diag(getFunctionOrMethodParamRange(D, 1).getBegin(),
5342 diag::err_anyx86_interrupt_attribute)
5343 << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
5346 << 3 << S.Context.getIntTypeForBitwidth(TypeSize, /*Signed=*/false);
5349 D->addAttr(::new (S.Context) AnyX86InterruptAttr(
5350 Attr.getLoc(), S.Context, Attr.getAttributeSpellingListIndex()));
5351 D->addAttr(UsedAttr::CreateImplicit(S.Context));
5354 static void handleAVRInterruptAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5355 if (!isFunctionOrMethod(D)) {
5356 S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
5357 << "'interrupt'" << ExpectedFunction;
5361 if (!checkAttributeNumArgs(S, Attr, 0))
5364 handleSimpleAttribute<AVRInterruptAttr>(S, D, Attr);
5367 static void handleAVRSignalAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5368 if (!isFunctionOrMethod(D)) {
5369 S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
5370 << "'signal'" << ExpectedFunction;
5374 if (!checkAttributeNumArgs(S, Attr, 0))
5377 handleSimpleAttribute<AVRSignalAttr>(S, D, Attr);
5380 static void handleInterruptAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5381 // Dispatch the interrupt attribute based on the current target.
5382 switch (S.Context.getTargetInfo().getTriple().getArch()) {
5383 case llvm::Triple::msp430:
5384 handleMSP430InterruptAttr(S, D, Attr);
5386 case llvm::Triple::mipsel:
5387 case llvm::Triple::mips:
5388 handleMipsInterruptAttr(S, D, Attr);
5390 case llvm::Triple::x86:
5391 case llvm::Triple::x86_64:
5392 handleAnyX86InterruptAttr(S, D, Attr);
5394 case llvm::Triple::avr:
5395 handleAVRInterruptAttr(S, D, Attr);
5398 handleARMInterruptAttr(S, D, Attr);
5403 static void handleAMDGPUFlatWorkGroupSizeAttr(Sema &S, Decl *D,
5404 const AttributeList &Attr) {
5406 Expr *MinExpr = Attr.getArgAsExpr(0);
5407 if (!checkUInt32Argument(S, Attr, MinExpr, Min))
5411 Expr *MaxExpr = Attr.getArgAsExpr(1);
5412 if (!checkUInt32Argument(S, Attr, MaxExpr, Max))
5415 if (Min == 0 && Max != 0) {
5416 S.Diag(Attr.getLoc(), diag::err_attribute_argument_invalid)
5417 << Attr.getName() << 0;
5421 S.Diag(Attr.getLoc(), diag::err_attribute_argument_invalid)
5422 << Attr.getName() << 1;
5426 D->addAttr(::new (S.Context)
5427 AMDGPUFlatWorkGroupSizeAttr(Attr.getLoc(), S.Context, Min, Max,
5428 Attr.getAttributeSpellingListIndex()));
5431 static void handleAMDGPUWavesPerEUAttr(Sema &S, Decl *D,
5432 const AttributeList &Attr) {
5434 Expr *MinExpr = Attr.getArgAsExpr(0);
5435 if (!checkUInt32Argument(S, Attr, MinExpr, Min))
5439 if (Attr.getNumArgs() == 2) {
5440 Expr *MaxExpr = Attr.getArgAsExpr(1);
5441 if (!checkUInt32Argument(S, Attr, MaxExpr, Max))
5445 if (Min == 0 && Max != 0) {
5446 S.Diag(Attr.getLoc(), diag::err_attribute_argument_invalid)
5447 << Attr.getName() << 0;
5450 if (Max != 0 && Min > Max) {
5451 S.Diag(Attr.getLoc(), diag::err_attribute_argument_invalid)
5452 << Attr.getName() << 1;
5456 D->addAttr(::new (S.Context)
5457 AMDGPUWavesPerEUAttr(Attr.getLoc(), S.Context, Min, Max,
5458 Attr.getAttributeSpellingListIndex()));
5461 static void handleAMDGPUNumSGPRAttr(Sema &S, Decl *D,
5462 const AttributeList &Attr) {
5463 uint32_t NumSGPR = 0;
5464 Expr *NumSGPRExpr = Attr.getArgAsExpr(0);
5465 if (!checkUInt32Argument(S, Attr, NumSGPRExpr, NumSGPR))
5468 D->addAttr(::new (S.Context)
5469 AMDGPUNumSGPRAttr(Attr.getLoc(), S.Context, NumSGPR,
5470 Attr.getAttributeSpellingListIndex()));
5473 static void handleAMDGPUNumVGPRAttr(Sema &S, Decl *D,
5474 const AttributeList &Attr) {
5475 uint32_t NumVGPR = 0;
5476 Expr *NumVGPRExpr = Attr.getArgAsExpr(0);
5477 if (!checkUInt32Argument(S, Attr, NumVGPRExpr, NumVGPR))
5480 D->addAttr(::new (S.Context)
5481 AMDGPUNumVGPRAttr(Attr.getLoc(), S.Context, NumVGPR,
5482 Attr.getAttributeSpellingListIndex()));
5485 static void handleX86ForceAlignArgPointerAttr(Sema &S, Decl *D,
5486 const AttributeList& Attr) {
5487 // If we try to apply it to a function pointer, don't warn, but don't
5488 // do anything, either. It doesn't matter anyway, because there's nothing
5489 // special about calling a force_align_arg_pointer function.
5490 ValueDecl *VD = dyn_cast<ValueDecl>(D);
5491 if (VD && VD->getType()->isFunctionPointerType())
5493 // Also don't warn on function pointer typedefs.
5494 TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
5495 if (TD && (TD->getUnderlyingType()->isFunctionPointerType() ||
5496 TD->getUnderlyingType()->isFunctionType()))
5498 // Attribute can only be applied to function types.
5499 if (!isa<FunctionDecl>(D)) {
5500 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
5501 << Attr.getName() << /* function */0;
5505 D->addAttr(::new (S.Context)
5506 X86ForceAlignArgPointerAttr(Attr.getRange(), S.Context,
5507 Attr.getAttributeSpellingListIndex()));
5510 static void handleLayoutVersion(Sema &S, Decl *D, const AttributeList &Attr) {
5512 Expr *VersionExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
5513 if (!checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), Version))
5516 // TODO: Investigate what happens with the next major version of MSVC.
5517 if (Version != LangOptions::MSVC2015) {
5518 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
5519 << Attr.getName() << Version << VersionExpr->getSourceRange();
5523 D->addAttr(::new (S.Context)
5524 LayoutVersionAttr(Attr.getRange(), S.Context, Version,
5525 Attr.getAttributeSpellingListIndex()));
5528 DLLImportAttr *Sema::mergeDLLImportAttr(Decl *D, SourceRange Range,
5529 unsigned AttrSpellingListIndex) {
5530 if (D->hasAttr<DLLExportAttr>()) {
5531 Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'dllimport'";
5535 if (D->hasAttr<DLLImportAttr>())
5538 return ::new (Context) DLLImportAttr(Range, Context, AttrSpellingListIndex);
5541 DLLExportAttr *Sema::mergeDLLExportAttr(Decl *D, SourceRange Range,
5542 unsigned AttrSpellingListIndex) {
5543 if (DLLImportAttr *Import = D->getAttr<DLLImportAttr>()) {
5544 Diag(Import->getLocation(), diag::warn_attribute_ignored) << Import;
5545 D->dropAttr<DLLImportAttr>();
5548 if (D->hasAttr<DLLExportAttr>())
5551 return ::new (Context) DLLExportAttr(Range, Context, AttrSpellingListIndex);
5554 static void handleDLLAttr(Sema &S, Decl *D, const AttributeList &A) {
5555 if (isa<ClassTemplatePartialSpecializationDecl>(D) &&
5556 S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
5557 S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored)
5562 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
5563 if (FD->isInlined() && A.getKind() == AttributeList::AT_DLLImport &&
5564 !S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
5565 // MinGW doesn't allow dllimport on inline functions.
5566 S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored_on_inline)
5572 if (auto *MD = dyn_cast<CXXMethodDecl>(D)) {
5573 if (S.Context.getTargetInfo().getCXXABI().isMicrosoft() &&
5574 MD->getParent()->isLambda()) {
5575 S.Diag(A.getRange().getBegin(), diag::err_attribute_dll_lambda) << A.getName();
5580 unsigned Index = A.getAttributeSpellingListIndex();
5581 Attr *NewAttr = A.getKind() == AttributeList::AT_DLLExport
5582 ? (Attr *)S.mergeDLLExportAttr(D, A.getRange(), Index)
5583 : (Attr *)S.mergeDLLImportAttr(D, A.getRange(), Index);
5585 D->addAttr(NewAttr);
5589 Sema::mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
5590 unsigned AttrSpellingListIndex,
5591 MSInheritanceAttr::Spelling SemanticSpelling) {
5592 if (MSInheritanceAttr *IA = D->getAttr<MSInheritanceAttr>()) {
5593 if (IA->getSemanticSpelling() == SemanticSpelling)
5595 Diag(IA->getLocation(), diag::err_mismatched_ms_inheritance)
5596 << 1 /*previous declaration*/;
5597 Diag(Range.getBegin(), diag::note_previous_ms_inheritance);
5598 D->dropAttr<MSInheritanceAttr>();
5601 CXXRecordDecl *RD = cast<CXXRecordDecl>(D);
5602 if (RD->hasDefinition()) {
5603 if (checkMSInheritanceAttrOnDefinition(RD, Range, BestCase,
5604 SemanticSpelling)) {
5608 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) {
5609 Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
5610 << 1 /*partial specialization*/;
5613 if (RD->getDescribedClassTemplate()) {
5614 Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
5615 << 0 /*primary template*/;
5620 return ::new (Context)
5621 MSInheritanceAttr(Range, Context, BestCase, AttrSpellingListIndex);
5624 static void handleCapabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5625 // The capability attributes take a single string parameter for the name of
5626 // the capability they represent. The lockable attribute does not take any
5627 // parameters. However, semantically, both attributes represent the same
5628 // concept, and so they use the same semantic attribute. Eventually, the
5629 // lockable attribute will be removed.
5631 // For backward compatibility, any capability which has no specified string
5632 // literal will be considered a "mutex."
5633 StringRef N("mutex");
5634 SourceLocation LiteralLoc;
5635 if (Attr.getKind() == AttributeList::AT_Capability &&
5636 !S.checkStringLiteralArgumentAttr(Attr, 0, N, &LiteralLoc))
5639 // Currently, there are only two names allowed for a capability: role and
5640 // mutex (case insensitive). Diagnose other capability names.
5641 if (!N.equals_lower("mutex") && !N.equals_lower("role"))
5642 S.Diag(LiteralLoc, diag::warn_invalid_capability_name) << N;
5644 D->addAttr(::new (S.Context) CapabilityAttr(Attr.getRange(), S.Context, N,
5645 Attr.getAttributeSpellingListIndex()));
5648 static void handleAssertCapabilityAttr(Sema &S, Decl *D,
5649 const AttributeList &Attr) {
5650 D->addAttr(::new (S.Context) AssertCapabilityAttr(Attr.getRange(), S.Context,
5651 Attr.getArgAsExpr(0),
5652 Attr.getAttributeSpellingListIndex()));
5655 static void handleAcquireCapabilityAttr(Sema &S, Decl *D,
5656 const AttributeList &Attr) {
5657 SmallVector<Expr*, 1> Args;
5658 if (!checkLockFunAttrCommon(S, D, Attr, Args))
5661 D->addAttr(::new (S.Context) AcquireCapabilityAttr(Attr.getRange(),
5663 Args.data(), Args.size(),
5664 Attr.getAttributeSpellingListIndex()));
5667 static void handleTryAcquireCapabilityAttr(Sema &S, Decl *D,
5668 const AttributeList &Attr) {
5669 SmallVector<Expr*, 2> Args;
5670 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
5673 D->addAttr(::new (S.Context) TryAcquireCapabilityAttr(Attr.getRange(),
5675 Attr.getArgAsExpr(0),
5678 Attr.getAttributeSpellingListIndex()));
5681 static void handleReleaseCapabilityAttr(Sema &S, Decl *D,
5682 const AttributeList &Attr) {
5683 // Check that all arguments are lockable objects.
5684 SmallVector<Expr *, 1> Args;
5685 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, true);
5687 D->addAttr(::new (S.Context) ReleaseCapabilityAttr(
5688 Attr.getRange(), S.Context, Args.data(), Args.size(),
5689 Attr.getAttributeSpellingListIndex()));
5692 static void handleRequiresCapabilityAttr(Sema &S, Decl *D,
5693 const AttributeList &Attr) {
5694 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
5697 // check that all arguments are lockable objects
5698 SmallVector<Expr*, 1> Args;
5699 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
5703 RequiresCapabilityAttr *RCA = ::new (S.Context)
5704 RequiresCapabilityAttr(Attr.getRange(), S.Context, Args.data(),
5705 Args.size(), Attr.getAttributeSpellingListIndex());
5710 static void handleDeprecatedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5711 if (auto *NSD = dyn_cast<NamespaceDecl>(D)) {
5712 if (NSD->isAnonymousNamespace()) {
5713 S.Diag(Attr.getLoc(), diag::warn_deprecated_anonymous_namespace);
5714 // Do not want to attach the attribute to the namespace because that will
5715 // cause confusing diagnostic reports for uses of declarations within the
5721 // Handle the cases where the attribute has a text message.
5722 StringRef Str, Replacement;
5723 if (Attr.isArgExpr(0) && Attr.getArgAsExpr(0) &&
5724 !S.checkStringLiteralArgumentAttr(Attr, 0, Str))
5727 // Only support a single optional message for Declspec and CXX11.
5728 if (Attr.isDeclspecAttribute() || Attr.isCXX11Attribute())
5729 checkAttributeAtMostNumArgs(S, Attr, 1);
5730 else if (Attr.isArgExpr(1) && Attr.getArgAsExpr(1) &&
5731 !S.checkStringLiteralArgumentAttr(Attr, 1, Replacement))
5734 if (!S.getLangOpts().CPlusPlus14)
5735 if (Attr.isCXX11Attribute() &&
5736 !(Attr.hasScope() && Attr.getScopeName()->isStr("gnu")))
5737 S.Diag(Attr.getLoc(), diag::ext_cxx14_attr) << Attr.getName();
5739 D->addAttr(::new (S.Context)
5740 DeprecatedAttr(Attr.getRange(), S.Context, Str, Replacement,
5741 Attr.getAttributeSpellingListIndex()));
5744 static bool isGlobalVar(const Decl *D) {
5745 if (const auto *S = dyn_cast<VarDecl>(D))
5746 return S->hasGlobalStorage();
5750 static void handleNoSanitizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5751 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
5754 std::vector<StringRef> Sanitizers;
5756 for (unsigned I = 0, E = Attr.getNumArgs(); I != E; ++I) {
5757 StringRef SanitizerName;
5758 SourceLocation LiteralLoc;
5760 if (!S.checkStringLiteralArgumentAttr(Attr, I, SanitizerName, &LiteralLoc))
5763 if (parseSanitizerValue(SanitizerName, /*AllowGroups=*/true) == 0)
5764 S.Diag(LiteralLoc, diag::warn_unknown_sanitizer_ignored) << SanitizerName;
5765 else if (isGlobalVar(D) && SanitizerName != "address")
5766 S.Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
5767 << Attr.getName() << ExpectedFunctionOrMethod;
5768 Sanitizers.push_back(SanitizerName);
5771 D->addAttr(::new (S.Context) NoSanitizeAttr(
5772 Attr.getRange(), S.Context, Sanitizers.data(), Sanitizers.size(),
5773 Attr.getAttributeSpellingListIndex()));
5776 static void handleNoSanitizeSpecificAttr(Sema &S, Decl *D,
5777 const AttributeList &Attr) {
5778 StringRef AttrName = Attr.getName()->getName();
5779 normalizeName(AttrName);
5780 StringRef SanitizerName = llvm::StringSwitch<StringRef>(AttrName)
5781 .Case("no_address_safety_analysis", "address")
5782 .Case("no_sanitize_address", "address")
5783 .Case("no_sanitize_thread", "thread")
5784 .Case("no_sanitize_memory", "memory");
5785 if (isGlobalVar(D) && SanitizerName != "address")
5786 S.Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
5787 << Attr.getName() << ExpectedFunction;
5788 D->addAttr(::new (S.Context)
5789 NoSanitizeAttr(Attr.getRange(), S.Context, &SanitizerName, 1,
5790 Attr.getAttributeSpellingListIndex()));
5793 static void handleInternalLinkageAttr(Sema &S, Decl *D,
5794 const AttributeList &Attr) {
5795 if (InternalLinkageAttr *Internal =
5796 S.mergeInternalLinkageAttr(D, Attr.getRange(), Attr.getName(),
5797 Attr.getAttributeSpellingListIndex()))
5798 D->addAttr(Internal);
5801 static void handleOpenCLNoSVMAttr(Sema &S, Decl *D, const AttributeList &Attr) {
5802 if (S.LangOpts.OpenCLVersion != 200)
5803 S.Diag(Attr.getLoc(), diag::err_attribute_requires_opencl_version)
5804 << Attr.getName() << "2.0" << 0;
5806 S.Diag(Attr.getLoc(), diag::warn_opencl_attr_deprecated_ignored)
5807 << Attr.getName() << "2.0";
5810 /// Handles semantic checking for features that are common to all attributes,
5811 /// such as checking whether a parameter was properly specified, or the correct
5812 /// number of arguments were passed, etc.
5813 static bool handleCommonAttributeFeatures(Sema &S, Scope *scope, Decl *D,
5814 const AttributeList &Attr) {
5815 // Several attributes carry different semantics than the parsing requires, so
5816 // those are opted out of the common argument checks.
5818 // We also bail on unknown and ignored attributes because those are handled
5819 // as part of the target-specific handling logic.
5820 if (Attr.getKind() == AttributeList::UnknownAttribute)
5822 // Check whether the attribute requires specific language extensions to be
5824 if (!Attr.diagnoseLangOpts(S))
5826 // Check whether the attribute appertains to the given subject.
5827 if (!Attr.diagnoseAppertainsTo(S, D))
5829 if (Attr.hasCustomParsing())
5832 if (Attr.getMinArgs() == Attr.getMaxArgs()) {
5833 // If there are no optional arguments, then checking for the argument count
5835 if (!checkAttributeNumArgs(S, Attr, Attr.getMinArgs()))
5838 // There are optional arguments, so checking is slightly more involved.
5839 if (Attr.getMinArgs() &&
5840 !checkAttributeAtLeastNumArgs(S, Attr, Attr.getMinArgs()))
5842 else if (!Attr.hasVariadicArg() && Attr.getMaxArgs() &&
5843 !checkAttributeAtMostNumArgs(S, Attr, Attr.getMaxArgs()))
5850 static void handleOpenCLAccessAttr(Sema &S, Decl *D,
5851 const AttributeList &Attr) {
5852 if (D->isInvalidDecl())
5855 // Check if there is only one access qualifier.
5856 if (D->hasAttr<OpenCLAccessAttr>()) {
5857 S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers)
5858 << D->getSourceRange();
5859 D->setInvalidDecl(true);
5863 // OpenCL v2.0 s6.6 - read_write can be used for image types to specify that an
5864 // image object can be read and written.
5865 // OpenCL v2.0 s6.13.6 - A kernel cannot read from and write to the same pipe
5866 // object. Using the read_write (or __read_write) qualifier with the pipe
5867 // qualifier is a compilation error.
5868 if (const ParmVarDecl *PDecl = dyn_cast<ParmVarDecl>(D)) {
5869 const Type *DeclTy = PDecl->getType().getCanonicalType().getTypePtr();
5870 if (Attr.getName()->getName().find("read_write") != StringRef::npos) {
5871 if (S.getLangOpts().OpenCLVersion < 200 || DeclTy->isPipeType()) {
5872 S.Diag(Attr.getLoc(), diag::err_opencl_invalid_read_write)
5873 << Attr.getName() << PDecl->getType() << DeclTy->isImageType();
5874 D->setInvalidDecl(true);
5880 D->addAttr(::new (S.Context) OpenCLAccessAttr(
5881 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
5884 //===----------------------------------------------------------------------===//
5885 // Top Level Sema Entry Points
5886 //===----------------------------------------------------------------------===//
5888 /// ProcessDeclAttribute - Apply the specific attribute to the specified decl if
5889 /// the attribute applies to decls. If the attribute is a type attribute, just
5890 /// silently ignore it if a GNU attribute.
5891 static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
5892 const AttributeList &Attr,
5893 bool IncludeCXX11Attributes) {
5894 if (Attr.isInvalid() || Attr.getKind() == AttributeList::IgnoredAttribute)
5897 // Ignore C++11 attributes on declarator chunks: they appertain to the type
5899 if (Attr.isCXX11Attribute() && !IncludeCXX11Attributes)
5902 // Unknown attributes are automatically warned on. Target-specific attributes
5903 // which do not apply to the current target architecture are treated as
5904 // though they were unknown attributes.
5905 if (Attr.getKind() == AttributeList::UnknownAttribute ||
5906 !Attr.existsInTarget(S.Context.getTargetInfo())) {
5907 S.Diag(Attr.getLoc(), Attr.isDeclspecAttribute()
5908 ? diag::warn_unhandled_ms_attribute_ignored
5909 : diag::warn_unknown_attribute_ignored)
5914 if (handleCommonAttributeFeatures(S, scope, D, Attr))
5917 switch (Attr.getKind()) {
5919 if (!Attr.isStmtAttr()) {
5920 // Type attributes are handled elsewhere; silently move on.
5921 assert(Attr.isTypeAttr() && "Non-type attribute not handled");
5924 S.Diag(Attr.getLoc(), diag::err_stmt_attribute_invalid_on_decl)
5925 << Attr.getName() << D->getLocation();
5927 case AttributeList::AT_Interrupt:
5928 handleInterruptAttr(S, D, Attr);
5930 case AttributeList::AT_X86ForceAlignArgPointer:
5931 handleX86ForceAlignArgPointerAttr(S, D, Attr);
5933 case AttributeList::AT_DLLExport:
5934 case AttributeList::AT_DLLImport:
5935 handleDLLAttr(S, D, Attr);
5937 case AttributeList::AT_Mips16:
5938 handleSimpleAttributeWithExclusions<Mips16Attr, MipsInterruptAttr>(S, D,
5941 case AttributeList::AT_NoMips16:
5942 handleSimpleAttribute<NoMips16Attr>(S, D, Attr);
5944 case AttributeList::AT_AMDGPUFlatWorkGroupSize:
5945 handleAMDGPUFlatWorkGroupSizeAttr(S, D, Attr);
5947 case AttributeList::AT_AMDGPUWavesPerEU:
5948 handleAMDGPUWavesPerEUAttr(S, D, Attr);
5950 case AttributeList::AT_AMDGPUNumSGPR:
5951 handleAMDGPUNumSGPRAttr(S, D, Attr);
5953 case AttributeList::AT_AMDGPUNumVGPR:
5954 handleAMDGPUNumVGPRAttr(S, D, Attr);
5956 case AttributeList::AT_AVRSignal:
5957 handleAVRSignalAttr(S, D, Attr);
5959 case AttributeList::AT_IBAction:
5960 handleSimpleAttribute<IBActionAttr>(S, D, Attr);
5962 case AttributeList::AT_IBOutlet:
5963 handleIBOutlet(S, D, Attr);
5965 case AttributeList::AT_IBOutletCollection:
5966 handleIBOutletCollection(S, D, Attr);
5968 case AttributeList::AT_IFunc:
5969 handleIFuncAttr(S, D, Attr);
5971 case AttributeList::AT_Alias:
5972 handleAliasAttr(S, D, Attr);
5974 case AttributeList::AT_Aligned:
5975 handleAlignedAttr(S, D, Attr);
5977 case AttributeList::AT_AlignValue:
5978 handleAlignValueAttr(S, D, Attr);
5980 case AttributeList::AT_AllocSize:
5981 handleAllocSizeAttr(S, D, Attr);
5983 case AttributeList::AT_AlwaysInline:
5984 handleAlwaysInlineAttr(S, D, Attr);
5986 case AttributeList::AT_AnalyzerNoReturn:
5987 handleAnalyzerNoReturnAttr(S, D, Attr);
5989 case AttributeList::AT_TLSModel:
5990 handleTLSModelAttr(S, D, Attr);
5992 case AttributeList::AT_Annotate:
5993 handleAnnotateAttr(S, D, Attr);
5995 case AttributeList::AT_Availability:
5996 handleAvailabilityAttr(S, D, Attr);
5998 case AttributeList::AT_CarriesDependency:
5999 handleDependencyAttr(S, scope, D, Attr);
6001 case AttributeList::AT_Common:
6002 handleCommonAttr(S, D, Attr);
6004 case AttributeList::AT_CUDAConstant:
6005 handleConstantAttr(S, D, Attr);
6007 case AttributeList::AT_PassObjectSize:
6008 handlePassObjectSizeAttr(S, D, Attr);
6010 case AttributeList::AT_Constructor:
6011 handleConstructorAttr(S, D, Attr);
6013 case AttributeList::AT_CXX11NoReturn:
6014 handleSimpleAttribute<CXX11NoReturnAttr>(S, D, Attr);
6016 case AttributeList::AT_Deprecated:
6017 handleDeprecatedAttr(S, D, Attr);
6019 case AttributeList::AT_Destructor:
6020 handleDestructorAttr(S, D, Attr);
6022 case AttributeList::AT_EnableIf:
6023 handleEnableIfAttr(S, D, Attr);
6025 case AttributeList::AT_DiagnoseIf:
6026 handleDiagnoseIfAttr(S, D, Attr);
6028 case AttributeList::AT_ExtVectorType:
6029 handleExtVectorTypeAttr(S, scope, D, Attr);
6031 case AttributeList::AT_ExternalSourceSymbol:
6032 handleExternalSourceSymbolAttr(S, D, Attr);
6034 case AttributeList::AT_MinSize:
6035 handleMinSizeAttr(S, D, Attr);
6037 case AttributeList::AT_OptimizeNone:
6038 handleOptimizeNoneAttr(S, D, Attr);
6040 case AttributeList::AT_FlagEnum:
6041 handleSimpleAttribute<FlagEnumAttr>(S, D, Attr);
6043 case AttributeList::AT_EnumExtensibility:
6044 handleEnumExtensibilityAttr(S, D, Attr);
6046 case AttributeList::AT_Flatten:
6047 handleSimpleAttribute<FlattenAttr>(S, D, Attr);
6049 case AttributeList::AT_Format:
6050 handleFormatAttr(S, D, Attr);
6052 case AttributeList::AT_FormatArg:
6053 handleFormatArgAttr(S, D, Attr);
6055 case AttributeList::AT_CUDAGlobal:
6056 handleGlobalAttr(S, D, Attr);
6058 case AttributeList::AT_CUDADevice:
6059 handleSimpleAttributeWithExclusions<CUDADeviceAttr, CUDAGlobalAttr>(S, D,
6062 case AttributeList::AT_CUDAHost:
6063 handleSimpleAttributeWithExclusions<CUDAHostAttr, CUDAGlobalAttr>(S, D,
6066 case AttributeList::AT_GNUInline:
6067 handleGNUInlineAttr(S, D, Attr);
6069 case AttributeList::AT_CUDALaunchBounds:
6070 handleLaunchBoundsAttr(S, D, Attr);
6072 case AttributeList::AT_Restrict:
6073 handleRestrictAttr(S, D, Attr);
6075 case AttributeList::AT_MayAlias:
6076 handleSimpleAttribute<MayAliasAttr>(S, D, Attr);
6078 case AttributeList::AT_Mode:
6079 handleModeAttr(S, D, Attr);
6081 case AttributeList::AT_NoAlias:
6082 handleSimpleAttribute<NoAliasAttr>(S, D, Attr);
6084 case AttributeList::AT_NoCommon:
6085 handleSimpleAttribute<NoCommonAttr>(S, D, Attr);
6087 case AttributeList::AT_NoSplitStack:
6088 handleSimpleAttribute<NoSplitStackAttr>(S, D, Attr);
6090 case AttributeList::AT_NonNull:
6091 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(D))
6092 handleNonNullAttrParameter(S, PVD, Attr);
6094 handleNonNullAttr(S, D, Attr);
6096 case AttributeList::AT_ReturnsNonNull:
6097 handleReturnsNonNullAttr(S, D, Attr);
6099 case AttributeList::AT_AssumeAligned:
6100 handleAssumeAlignedAttr(S, D, Attr);
6102 case AttributeList::AT_AllocAlign:
6103 handleAllocAlignAttr(S, D, Attr);
6105 case AttributeList::AT_Overloadable:
6106 handleSimpleAttribute<OverloadableAttr>(S, D, Attr);
6108 case AttributeList::AT_Ownership:
6109 handleOwnershipAttr(S, D, Attr);
6111 case AttributeList::AT_Cold:
6112 handleColdAttr(S, D, Attr);
6114 case AttributeList::AT_Hot:
6115 handleHotAttr(S, D, Attr);
6117 case AttributeList::AT_Naked:
6118 handleNakedAttr(S, D, Attr);
6120 case AttributeList::AT_NoReturn:
6121 handleNoReturnAttr(S, D, Attr);
6123 case AttributeList::AT_NoThrow:
6124 handleSimpleAttribute<NoThrowAttr>(S, D, Attr);
6126 case AttributeList::AT_CUDAShared:
6127 handleSharedAttr(S, D, Attr);
6129 case AttributeList::AT_VecReturn:
6130 handleVecReturnAttr(S, D, Attr);
6132 case AttributeList::AT_ObjCOwnership:
6133 handleObjCOwnershipAttr(S, D, Attr);
6135 case AttributeList::AT_ObjCPreciseLifetime:
6136 handleObjCPreciseLifetimeAttr(S, D, Attr);
6138 case AttributeList::AT_ObjCReturnsInnerPointer:
6139 handleObjCReturnsInnerPointerAttr(S, D, Attr);
6141 case AttributeList::AT_ObjCRequiresSuper:
6142 handleObjCRequiresSuperAttr(S, D, Attr);
6144 case AttributeList::AT_ObjCBridge:
6145 handleObjCBridgeAttr(S, scope, D, Attr);
6147 case AttributeList::AT_ObjCBridgeMutable:
6148 handleObjCBridgeMutableAttr(S, scope, D, Attr);
6150 case AttributeList::AT_ObjCBridgeRelated:
6151 handleObjCBridgeRelatedAttr(S, scope, D, Attr);
6153 case AttributeList::AT_ObjCDesignatedInitializer:
6154 handleObjCDesignatedInitializer(S, D, Attr);
6156 case AttributeList::AT_ObjCRuntimeName:
6157 handleObjCRuntimeName(S, D, Attr);
6159 case AttributeList::AT_ObjCRuntimeVisible:
6160 handleSimpleAttribute<ObjCRuntimeVisibleAttr>(S, D, Attr);
6162 case AttributeList::AT_ObjCBoxable:
6163 handleObjCBoxable(S, D, Attr);
6165 case AttributeList::AT_CFAuditedTransfer:
6166 handleCFAuditedTransferAttr(S, D, Attr);
6168 case AttributeList::AT_CFUnknownTransfer:
6169 handleCFUnknownTransferAttr(S, D, Attr);
6171 case AttributeList::AT_CFConsumed:
6172 case AttributeList::AT_NSConsumed:
6173 handleNSConsumedAttr(S, D, Attr);
6175 case AttributeList::AT_NSConsumesSelf:
6176 handleSimpleAttribute<NSConsumesSelfAttr>(S, D, Attr);
6178 case AttributeList::AT_NSReturnsAutoreleased:
6179 case AttributeList::AT_NSReturnsNotRetained:
6180 case AttributeList::AT_CFReturnsNotRetained:
6181 case AttributeList::AT_NSReturnsRetained:
6182 case AttributeList::AT_CFReturnsRetained:
6183 handleNSReturnsRetainedAttr(S, D, Attr);
6185 case AttributeList::AT_WorkGroupSizeHint:
6186 handleWorkGroupSize<WorkGroupSizeHintAttr>(S, D, Attr);
6188 case AttributeList::AT_ReqdWorkGroupSize:
6189 handleWorkGroupSize<ReqdWorkGroupSizeAttr>(S, D, Attr);
6191 case AttributeList::AT_OpenCLIntelReqdSubGroupSize:
6192 handleSubGroupSize(S, D, Attr);
6194 case AttributeList::AT_VecTypeHint:
6195 handleVecTypeHint(S, D, Attr);
6197 case AttributeList::AT_RequireConstantInit:
6198 handleSimpleAttribute<RequireConstantInitAttr>(S, D, Attr);
6200 case AttributeList::AT_InitPriority:
6201 handleInitPriorityAttr(S, D, Attr);
6203 case AttributeList::AT_Packed:
6204 handlePackedAttr(S, D, Attr);
6206 case AttributeList::AT_Section:
6207 handleSectionAttr(S, D, Attr);
6209 case AttributeList::AT_Target:
6210 handleTargetAttr(S, D, Attr);
6212 case AttributeList::AT_Unavailable:
6213 handleAttrWithMessage<UnavailableAttr>(S, D, Attr);
6215 case AttributeList::AT_ArcWeakrefUnavailable:
6216 handleSimpleAttribute<ArcWeakrefUnavailableAttr>(S, D, Attr);
6218 case AttributeList::AT_ObjCRootClass:
6219 handleSimpleAttribute<ObjCRootClassAttr>(S, D, Attr);
6221 case AttributeList::AT_ObjCSubclassingRestricted:
6222 handleSimpleAttribute<ObjCSubclassingRestrictedAttr>(S, D, Attr);
6224 case AttributeList::AT_ObjCExplicitProtocolImpl:
6225 handleObjCSuppresProtocolAttr(S, D, Attr);
6227 case AttributeList::AT_ObjCRequiresPropertyDefs:
6228 handleSimpleAttribute<ObjCRequiresPropertyDefsAttr>(S, D, Attr);
6230 case AttributeList::AT_Unused:
6231 handleUnusedAttr(S, D, Attr);
6233 case AttributeList::AT_ReturnsTwice:
6234 handleSimpleAttribute<ReturnsTwiceAttr>(S, D, Attr);
6236 case AttributeList::AT_NotTailCalled:
6237 handleNotTailCalledAttr(S, D, Attr);
6239 case AttributeList::AT_DisableTailCalls:
6240 handleDisableTailCallsAttr(S, D, Attr);
6242 case AttributeList::AT_Used:
6243 handleUsedAttr(S, D, Attr);
6245 case AttributeList::AT_Visibility:
6246 handleVisibilityAttr(S, D, Attr, false);
6248 case AttributeList::AT_TypeVisibility:
6249 handleVisibilityAttr(S, D, Attr, true);
6251 case AttributeList::AT_WarnUnused:
6252 handleSimpleAttribute<WarnUnusedAttr>(S, D, Attr);
6254 case AttributeList::AT_WarnUnusedResult:
6255 handleWarnUnusedResult(S, D, Attr);
6257 case AttributeList::AT_Weak:
6258 handleSimpleAttribute<WeakAttr>(S, D, Attr);
6260 case AttributeList::AT_WeakRef:
6261 handleWeakRefAttr(S, D, Attr);
6263 case AttributeList::AT_WeakImport:
6264 handleWeakImportAttr(S, D, Attr);
6266 case AttributeList::AT_TransparentUnion:
6267 handleTransparentUnionAttr(S, D, Attr);
6269 case AttributeList::AT_ObjCException:
6270 handleSimpleAttribute<ObjCExceptionAttr>(S, D, Attr);
6272 case AttributeList::AT_ObjCMethodFamily:
6273 handleObjCMethodFamilyAttr(S, D, Attr);
6275 case AttributeList::AT_ObjCNSObject:
6276 handleObjCNSObject(S, D, Attr);
6278 case AttributeList::AT_ObjCIndependentClass:
6279 handleObjCIndependentClass(S, D, Attr);
6281 case AttributeList::AT_Blocks:
6282 handleBlocksAttr(S, D, Attr);
6284 case AttributeList::AT_Sentinel:
6285 handleSentinelAttr(S, D, Attr);
6287 case AttributeList::AT_Const:
6288 handleSimpleAttribute<ConstAttr>(S, D, Attr);
6290 case AttributeList::AT_Pure:
6291 handleSimpleAttribute<PureAttr>(S, D, Attr);
6293 case AttributeList::AT_Cleanup:
6294 handleCleanupAttr(S, D, Attr);
6296 case AttributeList::AT_NoDebug:
6297 handleNoDebugAttr(S, D, Attr);
6299 case AttributeList::AT_NoDuplicate:
6300 handleSimpleAttribute<NoDuplicateAttr>(S, D, Attr);
6302 case AttributeList::AT_Convergent:
6303 handleSimpleAttribute<ConvergentAttr>(S, D, Attr);
6305 case AttributeList::AT_NoInline:
6306 handleSimpleAttribute<NoInlineAttr>(S, D, Attr);
6308 case AttributeList::AT_NoInstrumentFunction: // Interacts with -pg.
6309 handleSimpleAttribute<NoInstrumentFunctionAttr>(S, D, Attr);
6311 case AttributeList::AT_StdCall:
6312 case AttributeList::AT_CDecl:
6313 case AttributeList::AT_FastCall:
6314 case AttributeList::AT_ThisCall:
6315 case AttributeList::AT_Pascal:
6316 case AttributeList::AT_RegCall:
6317 case AttributeList::AT_SwiftCall:
6318 case AttributeList::AT_VectorCall:
6319 case AttributeList::AT_MSABI:
6320 case AttributeList::AT_SysVABI:
6321 case AttributeList::AT_Pcs:
6322 case AttributeList::AT_IntelOclBicc:
6323 case AttributeList::AT_PreserveMost:
6324 case AttributeList::AT_PreserveAll:
6325 handleCallConvAttr(S, D, Attr);
6327 case AttributeList::AT_Suppress:
6328 handleSuppressAttr(S, D, Attr);
6330 case AttributeList::AT_OpenCLKernel:
6331 handleSimpleAttribute<OpenCLKernelAttr>(S, D, Attr);
6333 case AttributeList::AT_OpenCLAccess:
6334 handleOpenCLAccessAttr(S, D, Attr);
6336 case AttributeList::AT_OpenCLNoSVM:
6337 handleOpenCLNoSVMAttr(S, D, Attr);
6339 case AttributeList::AT_SwiftContext:
6340 handleParameterABIAttr(S, D, Attr, ParameterABI::SwiftContext);
6342 case AttributeList::AT_SwiftErrorResult:
6343 handleParameterABIAttr(S, D, Attr, ParameterABI::SwiftErrorResult);
6345 case AttributeList::AT_SwiftIndirectResult:
6346 handleParameterABIAttr(S, D, Attr, ParameterABI::SwiftIndirectResult);
6348 case AttributeList::AT_InternalLinkage:
6349 handleInternalLinkageAttr(S, D, Attr);
6351 case AttributeList::AT_LTOVisibilityPublic:
6352 handleSimpleAttribute<LTOVisibilityPublicAttr>(S, D, Attr);
6355 // Microsoft attributes:
6356 case AttributeList::AT_EmptyBases:
6357 handleSimpleAttribute<EmptyBasesAttr>(S, D, Attr);
6359 case AttributeList::AT_LayoutVersion:
6360 handleLayoutVersion(S, D, Attr);
6362 case AttributeList::AT_MSNoVTable:
6363 handleSimpleAttribute<MSNoVTableAttr>(S, D, Attr);
6365 case AttributeList::AT_MSStruct:
6366 handleSimpleAttribute<MSStructAttr>(S, D, Attr);
6368 case AttributeList::AT_Uuid:
6369 handleUuidAttr(S, D, Attr);
6371 case AttributeList::AT_MSInheritance:
6372 handleMSInheritanceAttr(S, D, Attr);
6374 case AttributeList::AT_SelectAny:
6375 handleSimpleAttribute<SelectAnyAttr>(S, D, Attr);
6377 case AttributeList::AT_Thread:
6378 handleDeclspecThreadAttr(S, D, Attr);
6381 case AttributeList::AT_AbiTag:
6382 handleAbiTagAttr(S, D, Attr);
6385 // Thread safety attributes:
6386 case AttributeList::AT_AssertExclusiveLock:
6387 handleAssertExclusiveLockAttr(S, D, Attr);
6389 case AttributeList::AT_AssertSharedLock:
6390 handleAssertSharedLockAttr(S, D, Attr);
6392 case AttributeList::AT_GuardedVar:
6393 handleSimpleAttribute<GuardedVarAttr>(S, D, Attr);
6395 case AttributeList::AT_PtGuardedVar:
6396 handlePtGuardedVarAttr(S, D, Attr);
6398 case AttributeList::AT_ScopedLockable:
6399 handleSimpleAttribute<ScopedLockableAttr>(S, D, Attr);
6401 case AttributeList::AT_NoSanitize:
6402 handleNoSanitizeAttr(S, D, Attr);
6404 case AttributeList::AT_NoSanitizeSpecific:
6405 handleNoSanitizeSpecificAttr(S, D, Attr);
6407 case AttributeList::AT_NoThreadSafetyAnalysis:
6408 handleSimpleAttribute<NoThreadSafetyAnalysisAttr>(S, D, Attr);
6410 case AttributeList::AT_GuardedBy:
6411 handleGuardedByAttr(S, D, Attr);
6413 case AttributeList::AT_PtGuardedBy:
6414 handlePtGuardedByAttr(S, D, Attr);
6416 case AttributeList::AT_ExclusiveTrylockFunction:
6417 handleExclusiveTrylockFunctionAttr(S, D, Attr);
6419 case AttributeList::AT_LockReturned:
6420 handleLockReturnedAttr(S, D, Attr);
6422 case AttributeList::AT_LocksExcluded:
6423 handleLocksExcludedAttr(S, D, Attr);
6425 case AttributeList::AT_SharedTrylockFunction:
6426 handleSharedTrylockFunctionAttr(S, D, Attr);
6428 case AttributeList::AT_AcquiredBefore:
6429 handleAcquiredBeforeAttr(S, D, Attr);
6431 case AttributeList::AT_AcquiredAfter:
6432 handleAcquiredAfterAttr(S, D, Attr);
6435 // Capability analysis attributes.
6436 case AttributeList::AT_Capability:
6437 case AttributeList::AT_Lockable:
6438 handleCapabilityAttr(S, D, Attr);
6440 case AttributeList::AT_RequiresCapability:
6441 handleRequiresCapabilityAttr(S, D, Attr);
6444 case AttributeList::AT_AssertCapability:
6445 handleAssertCapabilityAttr(S, D, Attr);
6447 case AttributeList::AT_AcquireCapability:
6448 handleAcquireCapabilityAttr(S, D, Attr);
6450 case AttributeList::AT_ReleaseCapability:
6451 handleReleaseCapabilityAttr(S, D, Attr);
6453 case AttributeList::AT_TryAcquireCapability:
6454 handleTryAcquireCapabilityAttr(S, D, Attr);
6457 // Consumed analysis attributes.
6458 case AttributeList::AT_Consumable:
6459 handleConsumableAttr(S, D, Attr);
6461 case AttributeList::AT_ConsumableAutoCast:
6462 handleSimpleAttribute<ConsumableAutoCastAttr>(S, D, Attr);
6464 case AttributeList::AT_ConsumableSetOnRead:
6465 handleSimpleAttribute<ConsumableSetOnReadAttr>(S, D, Attr);
6467 case AttributeList::AT_CallableWhen:
6468 handleCallableWhenAttr(S, D, Attr);
6470 case AttributeList::AT_ParamTypestate:
6471 handleParamTypestateAttr(S, D, Attr);
6473 case AttributeList::AT_ReturnTypestate:
6474 handleReturnTypestateAttr(S, D, Attr);
6476 case AttributeList::AT_SetTypestate:
6477 handleSetTypestateAttr(S, D, Attr);
6479 case AttributeList::AT_TestTypestate:
6480 handleTestTypestateAttr(S, D, Attr);
6483 // Type safety attributes.
6484 case AttributeList::AT_ArgumentWithTypeTag:
6485 handleArgumentWithTypeTagAttr(S, D, Attr);
6487 case AttributeList::AT_TypeTagForDatatype:
6488 handleTypeTagForDatatypeAttr(S, D, Attr);
6490 case AttributeList::AT_AnyX86NoCallerSavedRegisters:
6491 handleNoCallerSavedRegsAttr(S, D, Attr);
6493 case AttributeList::AT_RenderScriptKernel:
6494 handleSimpleAttribute<RenderScriptKernelAttr>(S, D, Attr);
6497 case AttributeList::AT_XRayInstrument:
6498 handleSimpleAttribute<XRayInstrumentAttr>(S, D, Attr);
6500 case AttributeList::AT_XRayLogArgs:
6501 handleXRayLogArgsAttr(S, D, Attr);
6506 /// ProcessDeclAttributeList - Apply all the decl attributes in the specified
6507 /// attribute list to the specified decl, ignoring any type attributes.
6508 void Sema::ProcessDeclAttributeList(Scope *S, Decl *D,
6509 const AttributeList *AttrList,
6510 bool IncludeCXX11Attributes) {
6511 for (const AttributeList* l = AttrList; l; l = l->getNext())
6512 ProcessDeclAttribute(*this, S, D, *l, IncludeCXX11Attributes);
6514 // FIXME: We should be able to handle these cases in TableGen.
6516 // static int a9 __attribute__((weakref));
6517 // but that looks really pointless. We reject it.
6518 if (D->hasAttr<WeakRefAttr>() && !D->hasAttr<AliasAttr>()) {
6519 Diag(AttrList->getLoc(), diag::err_attribute_weakref_without_alias)
6520 << cast<NamedDecl>(D);
6521 D->dropAttr<WeakRefAttr>();
6525 // FIXME: We should be able to handle this in TableGen as well. It would be
6526 // good to have a way to specify "these attributes must appear as a group",
6527 // for these. Additionally, it would be good to have a way to specify "these
6528 // attribute must never appear as a group" for attributes like cold and hot.
6529 if (!D->hasAttr<OpenCLKernelAttr>()) {
6530 // These attributes cannot be applied to a non-kernel function.
6531 if (Attr *A = D->getAttr<ReqdWorkGroupSizeAttr>()) {
6532 // FIXME: This emits a different error message than
6533 // diag::err_attribute_wrong_decl_type + ExpectedKernelFunction.
6534 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
6535 D->setInvalidDecl();
6536 } else if (Attr *A = D->getAttr<WorkGroupSizeHintAttr>()) {
6537 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
6538 D->setInvalidDecl();
6539 } else if (Attr *A = D->getAttr<VecTypeHintAttr>()) {
6540 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
6541 D->setInvalidDecl();
6542 } else if (Attr *A = D->getAttr<AMDGPUFlatWorkGroupSizeAttr>()) {
6543 Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
6544 << A << ExpectedKernelFunction;
6545 D->setInvalidDecl();
6546 } else if (Attr *A = D->getAttr<AMDGPUWavesPerEUAttr>()) {
6547 Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
6548 << A << ExpectedKernelFunction;
6549 D->setInvalidDecl();
6550 } else if (Attr *A = D->getAttr<AMDGPUNumSGPRAttr>()) {
6551 Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
6552 << A << ExpectedKernelFunction;
6553 D->setInvalidDecl();
6554 } else if (Attr *A = D->getAttr<AMDGPUNumVGPRAttr>()) {
6555 Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
6556 << A << ExpectedKernelFunction;
6557 D->setInvalidDecl();
6558 } else if (Attr *A = D->getAttr<OpenCLIntelReqdSubGroupSizeAttr>()) {
6559 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
6560 D->setInvalidDecl();
6565 // Helper for delayed proccessing TransparentUnion attribute.
6566 void Sema::ProcessDeclAttributeDelayed(Decl *D, const AttributeList *AttrList) {
6567 for (const AttributeList *Attr = AttrList; Attr; Attr = Attr->getNext())
6568 if (Attr->getKind() == AttributeList::AT_TransparentUnion) {
6569 handleTransparentUnionAttr(*this, D, *Attr);
6574 // Annotation attributes are the only attributes allowed after an access
6576 bool Sema::ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
6577 const AttributeList *AttrList) {
6578 for (const AttributeList* l = AttrList; l; l = l->getNext()) {
6579 if (l->getKind() == AttributeList::AT_Annotate) {
6580 ProcessDeclAttribute(*this, nullptr, ASDecl, *l, l->isCXX11Attribute());
6582 Diag(l->getLoc(), diag::err_only_annotate_after_access_spec);
6590 /// checkUnusedDeclAttributes - Check a list of attributes to see if it
6591 /// contains any decl attributes that we should warn about.
6592 static void checkUnusedDeclAttributes(Sema &S, const AttributeList *A) {
6593 for ( ; A; A = A->getNext()) {
6594 // Only warn if the attribute is an unignored, non-type attribute.
6595 if (A->isUsedAsTypeAttr() || A->isInvalid()) continue;
6596 if (A->getKind() == AttributeList::IgnoredAttribute) continue;
6598 if (A->getKind() == AttributeList::UnknownAttribute) {
6599 S.Diag(A->getLoc(), diag::warn_unknown_attribute_ignored)
6600 << A->getName() << A->getRange();
6602 S.Diag(A->getLoc(), diag::warn_attribute_not_on_decl)
6603 << A->getName() << A->getRange();
6608 /// checkUnusedDeclAttributes - Given a declarator which is not being
6609 /// used to build a declaration, complain about any decl attributes
6610 /// which might be lying around on it.
6611 void Sema::checkUnusedDeclAttributes(Declarator &D) {
6612 ::checkUnusedDeclAttributes(*this, D.getDeclSpec().getAttributes().getList());
6613 ::checkUnusedDeclAttributes(*this, D.getAttributes());
6614 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i)
6615 ::checkUnusedDeclAttributes(*this, D.getTypeObject(i).getAttrs());
6618 /// DeclClonePragmaWeak - clone existing decl (maybe definition),
6619 /// \#pragma weak needs a non-definition decl and source may not have one.
6620 NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
6621 SourceLocation Loc) {
6622 assert(isa<FunctionDecl>(ND) || isa<VarDecl>(ND));
6623 NamedDecl *NewD = nullptr;
6624 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
6625 FunctionDecl *NewFD;
6626 // FIXME: Missing call to CheckFunctionDeclaration().
6628 // FIXME: Is the qualifier info correct?
6629 // FIXME: Is the DeclContext correct?
6630 NewFD = FunctionDecl::Create(FD->getASTContext(), FD->getDeclContext(),
6631 Loc, Loc, DeclarationName(II),
6632 FD->getType(), FD->getTypeSourceInfo(),
6633 SC_None, false/*isInlineSpecified*/,
6635 false/*isConstexprSpecified*/);
6638 if (FD->getQualifier())
6639 NewFD->setQualifierInfo(FD->getQualifierLoc());
6641 // Fake up parameter variables; they are declared as if this were
6643 QualType FDTy = FD->getType();
6644 if (const FunctionProtoType *FT = FDTy->getAs<FunctionProtoType>()) {
6645 SmallVector<ParmVarDecl*, 16> Params;
6646 for (const auto &AI : FT->param_types()) {
6647 ParmVarDecl *Param = BuildParmVarDeclForTypedef(NewFD, Loc, AI);
6648 Param->setScopeInfo(0, Params.size());
6649 Params.push_back(Param);
6651 NewFD->setParams(Params);
6653 } else if (VarDecl *VD = dyn_cast<VarDecl>(ND)) {
6654 NewD = VarDecl::Create(VD->getASTContext(), VD->getDeclContext(),
6655 VD->getInnerLocStart(), VD->getLocation(), II,
6656 VD->getType(), VD->getTypeSourceInfo(),
6657 VD->getStorageClass());
6658 if (VD->getQualifier()) {
6659 VarDecl *NewVD = cast<VarDecl>(NewD);
6660 NewVD->setQualifierInfo(VD->getQualifierLoc());
6666 /// DeclApplyPragmaWeak - A declaration (maybe definition) needs \#pragma weak
6667 /// applied to it, possibly with an alias.
6668 void Sema::DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W) {
6669 if (W.getUsed()) return; // only do this once
6671 if (W.getAlias()) { // clone decl, impersonate __attribute(weak,alias(...))
6672 IdentifierInfo *NDId = ND->getIdentifier();
6673 NamedDecl *NewD = DeclClonePragmaWeak(ND, W.getAlias(), W.getLocation());
6674 NewD->addAttr(AliasAttr::CreateImplicit(Context, NDId->getName(),
6676 NewD->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
6677 WeakTopLevelDecl.push_back(NewD);
6678 // FIXME: "hideous" code from Sema::LazilyCreateBuiltin
6679 // to insert Decl at TU scope, sorry.
6680 DeclContext *SavedContext = CurContext;
6681 CurContext = Context.getTranslationUnitDecl();
6682 NewD->setDeclContext(CurContext);
6683 NewD->setLexicalDeclContext(CurContext);
6684 PushOnScopeChains(NewD, S);
6685 CurContext = SavedContext;
6686 } else { // just add weak to existing
6687 ND->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
6691 void Sema::ProcessPragmaWeak(Scope *S, Decl *D) {
6692 // It's valid to "forward-declare" #pragma weak, in which case we
6694 LoadExternalWeakUndeclaredIdentifiers();
6695 if (!WeakUndeclaredIdentifiers.empty()) {
6696 NamedDecl *ND = nullptr;
6697 if (VarDecl *VD = dyn_cast<VarDecl>(D))
6698 if (VD->isExternC())
6700 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
6701 if (FD->isExternC())
6704 if (IdentifierInfo *Id = ND->getIdentifier()) {
6705 auto I = WeakUndeclaredIdentifiers.find(Id);
6706 if (I != WeakUndeclaredIdentifiers.end()) {
6707 WeakInfo W = I->second;
6708 DeclApplyPragmaWeak(S, ND, W);
6709 WeakUndeclaredIdentifiers[Id] = W;
6716 /// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in
6717 /// it, apply them to D. This is a bit tricky because PD can have attributes
6718 /// specified in many different places, and we need to find and apply them all.
6719 void Sema::ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD) {
6720 // Apply decl attributes from the DeclSpec if present.
6721 if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes().getList())
6722 ProcessDeclAttributeList(S, D, Attrs);
6724 // Walk the declarator structure, applying decl attributes that were in a type
6725 // position to the decl itself. This handles cases like:
6726 // int *__attr__(x)** D;
6727 // when X is a decl attribute.
6728 for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i)
6729 if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs())
6730 ProcessDeclAttributeList(S, D, Attrs, /*IncludeCXX11Attributes=*/false);
6732 // Finally, apply any attributes on the decl itself.
6733 if (const AttributeList *Attrs = PD.getAttributes())
6734 ProcessDeclAttributeList(S, D, Attrs);
6736 // Apply additional attributes specified by '#pragma clang attribute'.
6737 AddPragmaAttributes(S, D);
6740 /// Is the given declaration allowed to use a forbidden type?
6741 /// If so, it'll still be annotated with an attribute that makes it
6742 /// illegal to actually use.
6743 static bool isForbiddenTypeAllowed(Sema &S, Decl *decl,
6744 const DelayedDiagnostic &diag,
6745 UnavailableAttr::ImplicitReason &reason) {
6746 // Private ivars are always okay. Unfortunately, people don't
6747 // always properly make their ivars private, even in system headers.
6748 // Plus we need to make fields okay, too.
6749 if (!isa<FieldDecl>(decl) && !isa<ObjCPropertyDecl>(decl) &&
6750 !isa<FunctionDecl>(decl))
6753 // Silently accept unsupported uses of __weak in both user and system
6754 // declarations when it's been disabled, for ease of integration with
6755 // -fno-objc-arc files. We do have to take some care against attempts
6756 // to define such things; for now, we've only done that for ivars
6758 if ((isa<ObjCIvarDecl>(decl) || isa<ObjCPropertyDecl>(decl))) {
6759 if (diag.getForbiddenTypeDiagnostic() == diag::err_arc_weak_disabled ||
6760 diag.getForbiddenTypeDiagnostic() == diag::err_arc_weak_no_runtime) {
6761 reason = UnavailableAttr::IR_ForbiddenWeak;
6766 // Allow all sorts of things in system headers.
6767 if (S.Context.getSourceManager().isInSystemHeader(decl->getLocation())) {
6768 // Currently, all the failures dealt with this way are due to ARC
6770 reason = UnavailableAttr::IR_ARCForbiddenType;
6777 /// Handle a delayed forbidden-type diagnostic.
6778 static void handleDelayedForbiddenType(Sema &S, DelayedDiagnostic &diag,
6780 auto reason = UnavailableAttr::IR_None;
6781 if (decl && isForbiddenTypeAllowed(S, decl, diag, reason)) {
6782 assert(reason && "didn't set reason?");
6783 decl->addAttr(UnavailableAttr::CreateImplicit(S.Context, "", reason,
6787 if (S.getLangOpts().ObjCAutoRefCount)
6788 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(decl)) {
6789 // FIXME: we may want to suppress diagnostics for all
6790 // kind of forbidden type messages on unavailable functions.
6791 if (FD->hasAttr<UnavailableAttr>() &&
6792 diag.getForbiddenTypeDiagnostic() ==
6793 diag::err_arc_array_param_no_ownership) {
6794 diag.Triggered = true;
6799 S.Diag(diag.Loc, diag.getForbiddenTypeDiagnostic())
6800 << diag.getForbiddenTypeOperand() << diag.getForbiddenTypeArgument();
6801 diag.Triggered = true;
6804 static const AvailabilityAttr *getAttrForPlatform(ASTContext &Context,
6806 // Check each AvailabilityAttr to find the one for this platform.
6807 for (const auto *A : D->attrs()) {
6808 if (const auto *Avail = dyn_cast<AvailabilityAttr>(A)) {
6809 // FIXME: this is copied from CheckAvailability. We should try to
6812 // Check if this is an App Extension "platform", and if so chop off
6813 // the suffix for matching with the actual platform.
6814 StringRef ActualPlatform = Avail->getPlatform()->getName();
6815 StringRef RealizedPlatform = ActualPlatform;
6816 if (Context.getLangOpts().AppExt) {
6817 size_t suffix = RealizedPlatform.rfind("_app_extension");
6818 if (suffix != StringRef::npos)
6819 RealizedPlatform = RealizedPlatform.slice(0, suffix);
6822 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
6824 // Match the platform name.
6825 if (RealizedPlatform == TargetPlatform)
6832 /// \brief whether we should emit a diagnostic for \c K and \c DeclVersion in
6833 /// the context of \c Ctx. For example, we should emit an unavailable diagnostic
6834 /// in a deprecated context, but not the other way around.
6835 static bool ShouldDiagnoseAvailabilityInContext(Sema &S, AvailabilityResult K,
6836 VersionTuple DeclVersion,
6838 assert(K != AR_Available && "Expected an unavailable declaration here!");
6840 // Checks if we should emit the availability diagnostic in the context of C.
6841 auto CheckContext = [&](const Decl *C) {
6842 if (K == AR_NotYetIntroduced) {
6843 if (const AvailabilityAttr *AA = getAttrForPlatform(S.Context, C))
6844 if (AA->getIntroduced() >= DeclVersion)
6846 } else if (K == AR_Deprecated)
6847 if (C->isDeprecated())
6850 if (C->isUnavailable())
6855 // FIXME: This is a temporary workaround! Some existing Apple headers depends
6856 // on nested declarations in an @interface having the availability of the
6857 // interface when they really shouldn't: they are members of the enclosing
6858 // context, and can referenced from there.
6859 if (S.OriginalLexicalContext && cast<Decl>(S.OriginalLexicalContext) != Ctx) {
6860 auto *OrigCtx = cast<Decl>(S.OriginalLexicalContext);
6861 if (CheckContext(OrigCtx))
6864 // An implementation implicitly has the availability of the interface.
6865 if (auto *CatOrImpl = dyn_cast<ObjCImplDecl>(OrigCtx)) {
6866 if (const ObjCInterfaceDecl *Interface = CatOrImpl->getClassInterface())
6867 if (CheckContext(Interface))
6870 // A category implicitly has the availability of the interface.
6871 else if (auto *CatD = dyn_cast<ObjCCategoryDecl>(OrigCtx))
6872 if (const ObjCInterfaceDecl *Interface = CatD->getClassInterface())
6873 if (CheckContext(Interface))
6878 if (CheckContext(Ctx))
6881 // An implementation implicitly has the availability of the interface.
6882 if (auto *CatOrImpl = dyn_cast<ObjCImplDecl>(Ctx)) {
6883 if (const ObjCInterfaceDecl *Interface = CatOrImpl->getClassInterface())
6884 if (CheckContext(Interface))
6887 // A category implicitly has the availability of the interface.
6888 else if (auto *CatD = dyn_cast<ObjCCategoryDecl>(Ctx))
6889 if (const ObjCInterfaceDecl *Interface = CatD->getClassInterface())
6890 if (CheckContext(Interface))
6892 } while ((Ctx = cast_or_null<Decl>(Ctx->getDeclContext())));
6897 static void DoEmitAvailabilityWarning(Sema &S, AvailabilityResult K,
6898 Decl *Ctx, const NamedDecl *D,
6899 StringRef Message, SourceLocation Loc,
6900 const ObjCInterfaceDecl *UnknownObjCClass,
6901 const ObjCPropertyDecl *ObjCProperty,
6902 bool ObjCPropertyAccess) {
6903 // Diagnostics for deprecated or unavailable.
6904 unsigned diag, diag_message, diag_fwdclass_message;
6905 unsigned diag_available_here = diag::note_availability_specified_here;
6906 SourceLocation NoteLocation = D->getLocation();
6908 // Matches 'diag::note_property_attribute' options.
6909 unsigned property_note_select;
6911 // Matches diag::note_availability_specified_here.
6912 unsigned available_here_select_kind;
6914 VersionTuple DeclVersion;
6915 if (const AvailabilityAttr *AA = getAttrForPlatform(S.Context, D))
6916 DeclVersion = AA->getIntroduced();
6918 if (!ShouldDiagnoseAvailabilityInContext(S, K, DeclVersion, Ctx))
6923 diag = !ObjCPropertyAccess ? diag::warn_deprecated
6924 : diag::warn_property_method_deprecated;
6925 diag_message = diag::warn_deprecated_message;
6926 diag_fwdclass_message = diag::warn_deprecated_fwdclass_message;
6927 property_note_select = /* deprecated */ 0;
6928 available_here_select_kind = /* deprecated */ 2;
6929 if (const auto *attr = D->getAttr<DeprecatedAttr>())
6930 NoteLocation = attr->getLocation();
6933 case AR_Unavailable:
6934 diag = !ObjCPropertyAccess ? diag::err_unavailable
6935 : diag::err_property_method_unavailable;
6936 diag_message = diag::err_unavailable_message;
6937 diag_fwdclass_message = diag::warn_unavailable_fwdclass_message;
6938 property_note_select = /* unavailable */ 1;
6939 available_here_select_kind = /* unavailable */ 0;
6941 if (auto attr = D->getAttr<UnavailableAttr>()) {
6942 if (attr->isImplicit() && attr->getImplicitReason()) {
6943 // Most of these failures are due to extra restrictions in ARC;
6944 // reflect that in the primary diagnostic when applicable.
6945 auto flagARCError = [&] {
6946 if (S.getLangOpts().ObjCAutoRefCount &&
6947 S.getSourceManager().isInSystemHeader(D->getLocation()))
6948 diag = diag::err_unavailable_in_arc;
6951 switch (attr->getImplicitReason()) {
6952 case UnavailableAttr::IR_None: break;
6954 case UnavailableAttr::IR_ARCForbiddenType:
6956 diag_available_here = diag::note_arc_forbidden_type;
6959 case UnavailableAttr::IR_ForbiddenWeak:
6960 if (S.getLangOpts().ObjCWeakRuntime)
6961 diag_available_here = diag::note_arc_weak_disabled;
6963 diag_available_here = diag::note_arc_weak_no_runtime;
6966 case UnavailableAttr::IR_ARCForbiddenConversion:
6968 diag_available_here = diag::note_performs_forbidden_arc_conversion;
6971 case UnavailableAttr::IR_ARCInitReturnsUnrelated:
6973 diag_available_here = diag::note_arc_init_returns_unrelated;
6976 case UnavailableAttr::IR_ARCFieldWithOwnership:
6978 diag_available_here = diag::note_arc_field_with_ownership;
6985 case AR_NotYetIntroduced:
6986 diag = diag::warn_partial_availability;
6987 diag_message = diag::warn_partial_message;
6988 diag_fwdclass_message = diag::warn_partial_fwdclass_message;
6989 property_note_select = /* partial */ 2;
6990 available_here_select_kind = /* partial */ 3;
6994 llvm_unreachable("Warning for availability of available declaration?");
6997 CharSourceRange UseRange;
6998 StringRef Replacement;
6999 if (K == AR_Deprecated) {
7000 if (auto attr = D->getAttr<DeprecatedAttr>())
7001 Replacement = attr->getReplacement();
7002 if (auto attr = getAttrForPlatform(S.Context, D))
7003 Replacement = attr->getReplacement();
7005 if (!Replacement.empty())
7007 CharSourceRange::getCharRange(Loc, S.getLocForEndOfToken(Loc));
7010 if (!Message.empty()) {
7011 S.Diag(Loc, diag_message) << D << Message
7012 << (UseRange.isValid() ?
7013 FixItHint::CreateReplacement(UseRange, Replacement) : FixItHint());
7015 S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute)
7016 << ObjCProperty->getDeclName() << property_note_select;
7017 } else if (!UnknownObjCClass) {
7018 S.Diag(Loc, diag) << D
7019 << (UseRange.isValid() ?
7020 FixItHint::CreateReplacement(UseRange, Replacement) : FixItHint());
7022 S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute)
7023 << ObjCProperty->getDeclName() << property_note_select;
7025 S.Diag(Loc, diag_fwdclass_message) << D
7026 << (UseRange.isValid() ?
7027 FixItHint::CreateReplacement(UseRange, Replacement) : FixItHint());
7028 S.Diag(UnknownObjCClass->getLocation(), diag::note_forward_class);
7031 // The declaration can have multiple availability attributes, we are looking
7033 const AvailabilityAttr *A = getAttrForPlatform(S.Context, D);
7034 if (A && A->isInherited()) {
7035 for (const Decl *Redecl = D->getMostRecentDecl(); Redecl;
7036 Redecl = Redecl->getPreviousDecl()) {
7037 const AvailabilityAttr *AForRedecl = getAttrForPlatform(S.Context,
7039 if (AForRedecl && !AForRedecl->isInherited()) {
7040 // If D is a declaration with inherited attributes, the note should
7041 // point to the declaration with actual attributes.
7042 S.Diag(Redecl->getLocation(), diag_available_here) << D
7043 << available_here_select_kind;
7049 S.Diag(NoteLocation, diag_available_here)
7050 << D << available_here_select_kind;
7052 if (K == AR_NotYetIntroduced)
7053 S.Diag(Loc, diag::note_partial_availability_silence) << D;
7056 static void handleDelayedAvailabilityCheck(Sema &S, DelayedDiagnostic &DD,
7058 assert(DD.Kind == DelayedDiagnostic::Availability &&
7059 "Expected an availability diagnostic here");
7061 DD.Triggered = true;
7062 DoEmitAvailabilityWarning(
7063 S, DD.getAvailabilityResult(), Ctx, DD.getAvailabilityDecl(),
7064 DD.getAvailabilityMessage(), DD.Loc, DD.getUnknownObjCClass(),
7065 DD.getObjCProperty(), false);
7068 void Sema::PopParsingDeclaration(ParsingDeclState state, Decl *decl) {
7069 assert(DelayedDiagnostics.getCurrentPool());
7070 DelayedDiagnosticPool &poppedPool = *DelayedDiagnostics.getCurrentPool();
7071 DelayedDiagnostics.popWithoutEmitting(state);
7073 // When delaying diagnostics to run in the context of a parsed
7074 // declaration, we only want to actually emit anything if parsing
7078 // We emit all the active diagnostics in this pool or any of its
7079 // parents. In general, we'll get one pool for the decl spec
7080 // and a child pool for each declarator; in a decl group like:
7081 // deprecated_typedef foo, *bar, baz();
7082 // only the declarator pops will be passed decls. This is correct;
7083 // we really do need to consider delayed diagnostics from the decl spec
7084 // for each of the different declarations.
7085 const DelayedDiagnosticPool *pool = &poppedPool;
7087 for (DelayedDiagnosticPool::pool_iterator
7088 i = pool->pool_begin(), e = pool->pool_end(); i != e; ++i) {
7089 // This const_cast is a bit lame. Really, Triggered should be mutable.
7090 DelayedDiagnostic &diag = const_cast<DelayedDiagnostic&>(*i);
7094 switch (diag.Kind) {
7095 case DelayedDiagnostic::Availability:
7096 // Don't bother giving deprecation/unavailable diagnostics if
7097 // the decl is invalid.
7098 if (!decl->isInvalidDecl())
7099 handleDelayedAvailabilityCheck(*this, diag, decl);
7102 case DelayedDiagnostic::Access:
7103 HandleDelayedAccessCheck(diag, decl);
7106 case DelayedDiagnostic::ForbiddenType:
7107 handleDelayedForbiddenType(*this, diag, decl);
7111 } while ((pool = pool->getParent()));
7114 /// Given a set of delayed diagnostics, re-emit them as if they had
7115 /// been delayed in the current context instead of in the given pool.
7116 /// Essentially, this just moves them to the current pool.
7117 void Sema::redelayDiagnostics(DelayedDiagnosticPool &pool) {
7118 DelayedDiagnosticPool *curPool = DelayedDiagnostics.getCurrentPool();
7119 assert(curPool && "re-emitting in undelayed context not supported");
7120 curPool->steal(pool);
7123 void Sema::EmitAvailabilityWarning(AvailabilityResult AR,
7124 NamedDecl *D, StringRef Message,
7126 const ObjCInterfaceDecl *UnknownObjCClass,
7127 const ObjCPropertyDecl *ObjCProperty,
7128 bool ObjCPropertyAccess) {
7129 // Delay if we're currently parsing a declaration.
7130 if (DelayedDiagnostics.shouldDelayDiagnostics()) {
7131 DelayedDiagnostics.add(DelayedDiagnostic::makeAvailability(
7132 AR, Loc, D, UnknownObjCClass, ObjCProperty, Message,
7133 ObjCPropertyAccess));
7137 Decl *Ctx = cast<Decl>(getCurLexicalContext());
7138 DoEmitAvailabilityWarning(*this, AR, Ctx, D, Message, Loc, UnknownObjCClass,
7139 ObjCProperty, ObjCPropertyAccess);
7144 /// Returns true if the given statement can be a body-like child of \p Parent.
7145 bool isBodyLikeChildStmt(const Stmt *S, const Stmt *Parent) {
7146 switch (Parent->getStmtClass()) {
7147 case Stmt::IfStmtClass:
7148 return cast<IfStmt>(Parent)->getThen() == S ||
7149 cast<IfStmt>(Parent)->getElse() == S;
7150 case Stmt::WhileStmtClass:
7151 return cast<WhileStmt>(Parent)->getBody() == S;
7152 case Stmt::DoStmtClass:
7153 return cast<DoStmt>(Parent)->getBody() == S;
7154 case Stmt::ForStmtClass:
7155 return cast<ForStmt>(Parent)->getBody() == S;
7156 case Stmt::CXXForRangeStmtClass:
7157 return cast<CXXForRangeStmt>(Parent)->getBody() == S;
7158 case Stmt::ObjCForCollectionStmtClass:
7159 return cast<ObjCForCollectionStmt>(Parent)->getBody() == S;
7160 case Stmt::CaseStmtClass:
7161 case Stmt::DefaultStmtClass:
7162 return cast<SwitchCase>(Parent)->getSubStmt() == S;
7168 class StmtUSEFinder : public RecursiveASTVisitor<StmtUSEFinder> {
7172 bool VisitStmt(Stmt *S) { return S != Target; }
7174 /// Returns true if the given statement is present in the given declaration.
7175 static bool isContained(const Stmt *Target, const Decl *D) {
7176 StmtUSEFinder Visitor;
7177 Visitor.Target = Target;
7178 return !Visitor.TraverseDecl(const_cast<Decl *>(D));
7182 /// Traverses the AST and finds the last statement that used a given
7184 class LastDeclUSEFinder : public RecursiveASTVisitor<LastDeclUSEFinder> {
7188 bool VisitDeclRefExpr(DeclRefExpr *DRE) {
7189 if (DRE->getDecl() == D)
7194 static const Stmt *findLastStmtThatUsesDecl(const Decl *D,
7195 const CompoundStmt *Scope) {
7196 LastDeclUSEFinder Visitor;
7198 for (auto I = Scope->body_rbegin(), E = Scope->body_rend(); I != E; ++I) {
7200 if (!Visitor.TraverseStmt(const_cast<Stmt *>(S)))
7207 /// \brief This class implements -Wunguarded-availability.
7209 /// This is done with a traversal of the AST of a function that makes reference
7210 /// to a partially available declaration. Whenever we encounter an \c if of the
7211 /// form: \c if(@available(...)), we use the version from the condition to visit
7212 /// the then statement.
7213 class DiagnoseUnguardedAvailability
7214 : public RecursiveASTVisitor<DiagnoseUnguardedAvailability> {
7215 typedef RecursiveASTVisitor<DiagnoseUnguardedAvailability> Base;
7220 /// Stack of potentially nested 'if (@available(...))'s.
7221 SmallVector<VersionTuple, 8> AvailabilityStack;
7222 SmallVector<const Stmt *, 16> StmtStack;
7224 void DiagnoseDeclAvailability(NamedDecl *D, SourceRange Range);
7227 DiagnoseUnguardedAvailability(Sema &SemaRef, Decl *Ctx)
7228 : SemaRef(SemaRef), Ctx(Ctx) {
7229 AvailabilityStack.push_back(
7230 SemaRef.Context.getTargetInfo().getPlatformMinVersion());
7233 bool TraverseStmt(Stmt *S) {
7236 StmtStack.push_back(S);
7237 bool Result = Base::TraverseStmt(S);
7238 StmtStack.pop_back();
7242 void IssueDiagnostics(Stmt *S) { TraverseStmt(S); }
7244 bool TraverseIfStmt(IfStmt *If);
7246 bool VisitObjCMessageExpr(ObjCMessageExpr *Msg) {
7247 if (ObjCMethodDecl *D = Msg->getMethodDecl())
7248 DiagnoseDeclAvailability(
7249 D, SourceRange(Msg->getSelectorStartLoc(), Msg->getLocEnd()));
7253 bool VisitDeclRefExpr(DeclRefExpr *DRE) {
7254 DiagnoseDeclAvailability(DRE->getDecl(),
7255 SourceRange(DRE->getLocStart(), DRE->getLocEnd()));
7259 bool VisitMemberExpr(MemberExpr *ME) {
7260 DiagnoseDeclAvailability(ME->getMemberDecl(),
7261 SourceRange(ME->getLocStart(), ME->getLocEnd()));
7265 bool VisitTypeLoc(TypeLoc Ty);
7268 void DiagnoseUnguardedAvailability::DiagnoseDeclAvailability(
7269 NamedDecl *D, SourceRange Range) {
7271 VersionTuple ContextVersion = AvailabilityStack.back();
7272 if (AvailabilityResult Result =
7273 SemaRef.ShouldDiagnoseAvailabilityOfDecl(D, nullptr)) {
7274 // All other diagnostic kinds have already been handled in
7275 // DiagnoseAvailabilityOfDecl.
7276 if (Result != AR_NotYetIntroduced)
7279 const AvailabilityAttr *AA = getAttrForPlatform(SemaRef.getASTContext(), D);
7280 VersionTuple Introduced = AA->getIntroduced();
7282 if (ContextVersion >= Introduced)
7285 // If the context of this function is less available than D, we should not
7286 // emit a diagnostic.
7287 if (!ShouldDiagnoseAvailabilityInContext(SemaRef, Result, Introduced, Ctx))
7290 SemaRef.Diag(Range.getBegin(), diag::warn_unguarded_availability)
7292 << AvailabilityAttr::getPrettyPlatformName(
7293 SemaRef.getASTContext().getTargetInfo().getPlatformName())
7294 << Introduced.getAsString();
7296 SemaRef.Diag(D->getLocation(), diag::note_availability_specified_here)
7297 << D << /* partial */ 3;
7300 SemaRef.Diag(Range.getBegin(), diag::note_unguarded_available_silence)
7302 << (SemaRef.getLangOpts().ObjC1 ? /*@available*/ 0
7303 : /*__builtin_available*/ 1);
7305 // Find the statement which should be enclosed in the if @available check.
7306 if (StmtStack.empty())
7308 const Stmt *StmtOfUse = StmtStack.back();
7309 const CompoundStmt *Scope = nullptr;
7310 for (const Stmt *S : llvm::reverse(StmtStack)) {
7311 if (const auto *CS = dyn_cast<CompoundStmt>(S)) {
7315 if (isBodyLikeChildStmt(StmtOfUse, S)) {
7316 // The declaration won't be seen outside of the statement, so we don't
7317 // have to wrap the uses of any declared variables in if (@available).
7318 // Therefore we can avoid setting Scope here.
7323 const Stmt *LastStmtOfUse = nullptr;
7324 if (isa<DeclStmt>(StmtOfUse) && Scope) {
7325 for (const Decl *D : cast<DeclStmt>(StmtOfUse)->decls()) {
7326 if (StmtUSEFinder::isContained(StmtStack.back(), D)) {
7327 LastStmtOfUse = LastDeclUSEFinder::findLastStmtThatUsesDecl(D, Scope);
7333 const SourceManager &SM = SemaRef.getSourceManager();
7334 SourceLocation IfInsertionLoc =
7335 SM.getExpansionLoc(StmtOfUse->getLocStart());
7336 SourceLocation StmtEndLoc =
7337 SM.getExpansionRange(
7338 (LastStmtOfUse ? LastStmtOfUse : StmtOfUse)->getLocEnd())
7340 if (SM.getFileID(IfInsertionLoc) != SM.getFileID(StmtEndLoc))
7343 StringRef Indentation = Lexer::getIndentationForLine(IfInsertionLoc, SM);
7344 const char *ExtraIndentation = " ";
7345 std::string FixItString;
7346 llvm::raw_string_ostream FixItOS(FixItString);
7347 FixItOS << "if (" << (SemaRef.getLangOpts().ObjC1 ? "@available"
7348 : "__builtin_available")
7349 << "(" << SemaRef.getASTContext().getTargetInfo().getPlatformName()
7350 << " " << Introduced.getAsString() << ", *)) {\n"
7351 << Indentation << ExtraIndentation;
7352 FixitDiag << FixItHint::CreateInsertion(IfInsertionLoc, FixItOS.str());
7353 SourceLocation ElseInsertionLoc = Lexer::findLocationAfterToken(
7354 StmtEndLoc, tok::semi, SM, SemaRef.getLangOpts(),
7355 /*SkipTrailingWhitespaceAndNewLine=*/false);
7356 if (ElseInsertionLoc.isInvalid())
7358 Lexer::getLocForEndOfToken(StmtEndLoc, 0, SM, SemaRef.getLangOpts());
7359 FixItOS.str().clear();
7361 << Indentation << "} else {\n"
7362 << Indentation << ExtraIndentation
7363 << "// Fallback on earlier versions\n"
7364 << Indentation << "}";
7365 FixitDiag << FixItHint::CreateInsertion(ElseInsertionLoc, FixItOS.str());
7369 bool DiagnoseUnguardedAvailability::VisitTypeLoc(TypeLoc Ty) {
7370 const Type *TyPtr = Ty.getTypePtr();
7371 SourceRange Range{Ty.getBeginLoc(), Ty.getEndLoc()};
7373 if (const TagType *TT = dyn_cast<TagType>(TyPtr)) {
7374 TagDecl *TD = TT->getDecl();
7375 DiagnoseDeclAvailability(TD, Range);
7377 } else if (const TypedefType *TD = dyn_cast<TypedefType>(TyPtr)) {
7378 TypedefNameDecl *D = TD->getDecl();
7379 DiagnoseDeclAvailability(D, Range);
7381 } else if (const auto *ObjCO = dyn_cast<ObjCObjectType>(TyPtr)) {
7382 if (NamedDecl *D = ObjCO->getInterface())
7383 DiagnoseDeclAvailability(D, Range);
7389 bool DiagnoseUnguardedAvailability::TraverseIfStmt(IfStmt *If) {
7390 VersionTuple CondVersion;
7391 if (auto *E = dyn_cast<ObjCAvailabilityCheckExpr>(If->getCond())) {
7392 CondVersion = E->getVersion();
7394 // If we're using the '*' case here or if this check is redundant, then we
7395 // use the enclosing version to check both branches.
7396 if (CondVersion.empty() || CondVersion <= AvailabilityStack.back())
7397 return Base::TraverseStmt(If->getThen()) &&
7398 Base::TraverseStmt(If->getElse());
7400 // This isn't an availability checking 'if', we can just continue.
7401 return Base::TraverseIfStmt(If);
7404 AvailabilityStack.push_back(CondVersion);
7405 bool ShouldContinue = TraverseStmt(If->getThen());
7406 AvailabilityStack.pop_back();
7408 return ShouldContinue && TraverseStmt(If->getElse());
7411 } // end anonymous namespace
7413 void Sema::DiagnoseUnguardedAvailabilityViolations(Decl *D) {
7414 Stmt *Body = nullptr;
7416 if (auto *FD = D->getAsFunction()) {
7417 // FIXME: We only examine the pattern decl for availability violations now,
7418 // but we should also examine instantiated templates.
7419 if (FD->isTemplateInstantiation())
7422 Body = FD->getBody();
7423 } else if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
7424 Body = MD->getBody();
7425 else if (auto *BD = dyn_cast<BlockDecl>(D))
7426 Body = BD->getBody();
7428 assert(Body && "Need a body here!");
7430 DiagnoseUnguardedAvailability(*this, D).IssueDiagnostics(Body);