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/Sema/SemaInternal.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/CXXInheritance.h"
17 #include "clang/AST/DeclCXX.h"
18 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/DeclTemplate.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/Mangle.h"
23 #include "clang/Basic/CharInfo.h"
24 #include "clang/Basic/SourceManager.h"
25 #include "clang/Basic/TargetInfo.h"
26 #include "clang/Lex/Preprocessor.h"
27 #include "clang/Sema/DeclSpec.h"
28 #include "clang/Sema/DelayedDiagnostic.h"
29 #include "clang/Sema/Lookup.h"
30 #include "clang/Sema/Scope.h"
31 #include "llvm/ADT/StringExtras.h"
32 #include "llvm/Support/MathExtras.h"
33 using namespace clang;
36 namespace AttributeLangSupport {
44 //===----------------------------------------------------------------------===//
46 //===----------------------------------------------------------------------===//
48 /// isFunctionOrMethod - Return true if the given decl has function
49 /// type (function or function-typed variable) or an Objective-C
51 static bool isFunctionOrMethod(const Decl *D) {
52 return (D->getFunctionType() != nullptr) || isa<ObjCMethodDecl>(D);
54 /// \brief Return true if the given decl has function type (function or
55 /// function-typed variable) or an Objective-C method or a block.
56 static bool isFunctionOrMethodOrBlock(const Decl *D) {
57 return isFunctionOrMethod(D) || isa<BlockDecl>(D);
60 /// Return true if the given decl has a declarator that should have
61 /// been processed by Sema::GetTypeForDeclarator.
62 static bool hasDeclarator(const Decl *D) {
63 // In some sense, TypedefDecl really *ought* to be a DeclaratorDecl.
64 return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) ||
65 isa<ObjCPropertyDecl>(D);
68 /// hasFunctionProto - Return true if the given decl has a argument
69 /// information. This decl should have already passed
70 /// isFunctionOrMethod or isFunctionOrMethodOrBlock.
71 static bool hasFunctionProto(const Decl *D) {
72 if (const FunctionType *FnTy = D->getFunctionType())
73 return isa<FunctionProtoType>(FnTy);
74 return isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D);
77 /// getFunctionOrMethodNumParams - Return number of function or method
78 /// parameters. It is an error to call this on a K&R function (use
79 /// hasFunctionProto first).
80 static unsigned getFunctionOrMethodNumParams(const Decl *D) {
81 if (const FunctionType *FnTy = D->getFunctionType())
82 return cast<FunctionProtoType>(FnTy)->getNumParams();
83 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
84 return BD->getNumParams();
85 return cast<ObjCMethodDecl>(D)->param_size();
88 static QualType getFunctionOrMethodParamType(const Decl *D, unsigned Idx) {
89 if (const FunctionType *FnTy = D->getFunctionType())
90 return cast<FunctionProtoType>(FnTy)->getParamType(Idx);
91 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
92 return BD->getParamDecl(Idx)->getType();
94 return cast<ObjCMethodDecl>(D)->parameters()[Idx]->getType();
97 static SourceRange getFunctionOrMethodParamRange(const Decl *D, unsigned Idx) {
98 if (const auto *FD = dyn_cast<FunctionDecl>(D))
99 return FD->getParamDecl(Idx)->getSourceRange();
100 if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
101 return MD->parameters()[Idx]->getSourceRange();
102 if (const auto *BD = dyn_cast<BlockDecl>(D))
103 return BD->getParamDecl(Idx)->getSourceRange();
104 return SourceRange();
107 static QualType getFunctionOrMethodResultType(const Decl *D) {
108 if (const FunctionType *FnTy = D->getFunctionType())
109 return cast<FunctionType>(FnTy)->getReturnType();
110 return cast<ObjCMethodDecl>(D)->getReturnType();
113 static SourceRange getFunctionOrMethodResultSourceRange(const Decl *D) {
114 if (const auto *FD = dyn_cast<FunctionDecl>(D))
115 return FD->getReturnTypeSourceRange();
116 if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
117 return MD->getReturnTypeSourceRange();
118 return SourceRange();
121 static bool isFunctionOrMethodVariadic(const Decl *D) {
122 if (const FunctionType *FnTy = D->getFunctionType()) {
123 const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy);
124 return proto->isVariadic();
126 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
127 return BD->isVariadic();
129 return cast<ObjCMethodDecl>(D)->isVariadic();
132 static bool isInstanceMethod(const Decl *D) {
133 if (const CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D))
134 return MethodDecl->isInstance();
138 static inline bool isNSStringType(QualType T, ASTContext &Ctx) {
139 const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>();
143 ObjCInterfaceDecl *Cls = PT->getObjectType()->getInterface();
147 IdentifierInfo* ClsName = Cls->getIdentifier();
149 // FIXME: Should we walk the chain of classes?
150 return ClsName == &Ctx.Idents.get("NSString") ||
151 ClsName == &Ctx.Idents.get("NSMutableString");
154 static inline bool isCFStringType(QualType T, ASTContext &Ctx) {
155 const PointerType *PT = T->getAs<PointerType>();
159 const RecordType *RT = PT->getPointeeType()->getAs<RecordType>();
163 const RecordDecl *RD = RT->getDecl();
164 if (RD->getTagKind() != TTK_Struct)
167 return RD->getIdentifier() == &Ctx.Idents.get("__CFString");
170 static unsigned getNumAttributeArgs(const AttributeList &Attr) {
171 // FIXME: Include the type in the argument list.
172 return Attr.getNumArgs() + Attr.hasParsedType();
175 template <typename Compare>
176 static bool checkAttributeNumArgsImpl(Sema &S, const AttributeList &Attr,
177 unsigned Num, unsigned Diag,
179 if (Comp(getNumAttributeArgs(Attr), Num)) {
180 S.Diag(Attr.getLoc(), Diag) << Attr.getName() << Num;
187 /// \brief Check if the attribute has exactly as many args as Num. May
189 static bool checkAttributeNumArgs(Sema &S, const AttributeList &Attr,
191 return checkAttributeNumArgsImpl(S, Attr, Num,
192 diag::err_attribute_wrong_number_arguments,
193 std::not_equal_to<unsigned>());
196 /// \brief Check if the attribute has at least as many args as Num. May
198 static bool checkAttributeAtLeastNumArgs(Sema &S, const AttributeList &Attr,
200 return checkAttributeNumArgsImpl(S, Attr, Num,
201 diag::err_attribute_too_few_arguments,
202 std::less<unsigned>());
205 /// \brief Check if the attribute has at most as many args as Num. May
207 static bool checkAttributeAtMostNumArgs(Sema &S, const AttributeList &Attr,
209 return checkAttributeNumArgsImpl(S, Attr, Num,
210 diag::err_attribute_too_many_arguments,
211 std::greater<unsigned>());
214 /// \brief If Expr is a valid integer constant, get the value of the integer
215 /// expression and return success or failure. May output an error.
216 static bool checkUInt32Argument(Sema &S, const AttributeList &Attr,
217 const Expr *Expr, uint32_t &Val,
218 unsigned Idx = UINT_MAX) {
220 if (Expr->isTypeDependent() || Expr->isValueDependent() ||
221 !Expr->isIntegerConstantExpr(I, S.Context)) {
223 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
224 << Attr.getName() << Idx << AANT_ArgumentIntegerConstant
225 << Expr->getSourceRange();
227 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
228 << Attr.getName() << AANT_ArgumentIntegerConstant
229 << Expr->getSourceRange();
234 S.Diag(Expr->getExprLoc(), diag::err_ice_too_large)
235 << I.toString(10, false) << 32 << /* Unsigned */ 1;
239 Val = (uint32_t)I.getZExtValue();
243 /// \brief Diagnose mutually exclusive attributes when present on a given
244 /// declaration. Returns true if diagnosed.
245 template <typename AttrTy>
246 static bool checkAttrMutualExclusion(Sema &S, Decl *D,
247 const AttributeList &Attr) {
248 if (AttrTy *A = D->getAttr<AttrTy>()) {
249 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
250 << Attr.getName() << A;
256 /// \brief Check if IdxExpr is a valid parameter index for a function or
257 /// instance method D. May output an error.
259 /// \returns true if IdxExpr is a valid index.
260 static bool checkFunctionOrMethodParameterIndex(Sema &S, const Decl *D,
261 const AttributeList &Attr,
265 assert(isFunctionOrMethodOrBlock(D));
267 // In C++ the implicit 'this' function parameter also counts.
268 // Parameters are counted from one.
269 bool HP = hasFunctionProto(D);
270 bool HasImplicitThisParam = isInstanceMethod(D);
271 bool IV = HP && isFunctionOrMethodVariadic(D);
273 (HP ? getFunctionOrMethodNumParams(D) : 0) + HasImplicitThisParam;
276 if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() ||
277 !IdxExpr->isIntegerConstantExpr(IdxInt, S.Context)) {
278 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
279 << Attr.getName() << AttrArgNum << AANT_ArgumentIntegerConstant
280 << IdxExpr->getSourceRange();
284 Idx = IdxInt.getLimitedValue();
285 if (Idx < 1 || (!IV && Idx > NumParams)) {
286 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
287 << Attr.getName() << AttrArgNum << IdxExpr->getSourceRange();
290 Idx--; // Convert to zero-based.
291 if (HasImplicitThisParam) {
293 S.Diag(Attr.getLoc(),
294 diag::err_attribute_invalid_implicit_this_argument)
295 << Attr.getName() << IdxExpr->getSourceRange();
304 /// \brief Check if the argument \p ArgNum of \p Attr is a ASCII string literal.
305 /// If not emit an error and return false. If the argument is an identifier it
306 /// will emit an error with a fixit hint and treat it as if it was a string
308 bool Sema::checkStringLiteralArgumentAttr(const AttributeList &Attr,
309 unsigned ArgNum, StringRef &Str,
310 SourceLocation *ArgLocation) {
311 // Look for identifiers. If we have one emit a hint to fix it to a literal.
312 if (Attr.isArgIdent(ArgNum)) {
313 IdentifierLoc *Loc = Attr.getArgAsIdent(ArgNum);
314 Diag(Loc->Loc, diag::err_attribute_argument_type)
315 << Attr.getName() << AANT_ArgumentString
316 << FixItHint::CreateInsertion(Loc->Loc, "\"")
317 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(Loc->Loc), "\"");
318 Str = Loc->Ident->getName();
320 *ArgLocation = Loc->Loc;
324 // Now check for an actual string literal.
325 Expr *ArgExpr = Attr.getArgAsExpr(ArgNum);
326 StringLiteral *Literal = dyn_cast<StringLiteral>(ArgExpr->IgnoreParenCasts());
328 *ArgLocation = ArgExpr->getLocStart();
330 if (!Literal || !Literal->isAscii()) {
331 Diag(ArgExpr->getLocStart(), diag::err_attribute_argument_type)
332 << Attr.getName() << AANT_ArgumentString;
336 Str = Literal->getString();
340 /// \brief Applies the given attribute to the Decl without performing any
341 /// additional semantic checking.
342 template <typename AttrType>
343 static void handleSimpleAttribute(Sema &S, Decl *D,
344 const AttributeList &Attr) {
345 D->addAttr(::new (S.Context) AttrType(Attr.getRange(), S.Context,
346 Attr.getAttributeSpellingListIndex()));
349 /// \brief Check if the passed-in expression is of type int or bool.
350 static bool isIntOrBool(Expr *Exp) {
351 QualType QT = Exp->getType();
352 return QT->isBooleanType() || QT->isIntegerType();
356 // Check to see if the type is a smart pointer of some kind. We assume
357 // it's a smart pointer if it defines both operator-> and operator*.
358 static bool threadSafetyCheckIsSmartPointer(Sema &S, const RecordType* RT) {
359 DeclContextLookupResult Res1 = RT->getDecl()->lookup(
360 S.Context.DeclarationNames.getCXXOperatorName(OO_Star));
364 DeclContextLookupResult Res2 = RT->getDecl()->lookup(
365 S.Context.DeclarationNames.getCXXOperatorName(OO_Arrow));
372 /// \brief Check if passed in Decl is a pointer type.
373 /// Note that this function may produce an error message.
374 /// \return true if the Decl is a pointer type; false otherwise
375 static bool threadSafetyCheckIsPointer(Sema &S, const Decl *D,
376 const AttributeList &Attr) {
377 const ValueDecl *vd = cast<ValueDecl>(D);
378 QualType QT = vd->getType();
379 if (QT->isAnyPointerType())
382 if (const RecordType *RT = QT->getAs<RecordType>()) {
383 // If it's an incomplete type, it could be a smart pointer; skip it.
384 // (We don't want to force template instantiation if we can avoid it,
385 // since that would alter the order in which templates are instantiated.)
386 if (RT->isIncompleteType())
389 if (threadSafetyCheckIsSmartPointer(S, RT))
393 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_pointer)
394 << Attr.getName() << QT;
398 /// \brief Checks that the passed in QualType either is of RecordType or points
399 /// to RecordType. Returns the relevant RecordType, null if it does not exit.
400 static const RecordType *getRecordType(QualType QT) {
401 if (const RecordType *RT = QT->getAs<RecordType>())
404 // Now check if we point to record type.
405 if (const PointerType *PT = QT->getAs<PointerType>())
406 return PT->getPointeeType()->getAs<RecordType>();
411 static bool checkRecordTypeForCapability(Sema &S, QualType Ty) {
412 const RecordType *RT = getRecordType(Ty);
417 // Don't check for the capability if the class hasn't been defined yet.
418 if (RT->isIncompleteType())
421 // Allow smart pointers to be used as capability objects.
422 // FIXME -- Check the type that the smart pointer points to.
423 if (threadSafetyCheckIsSmartPointer(S, RT))
426 // Check if the record itself has a capability.
427 RecordDecl *RD = RT->getDecl();
428 if (RD->hasAttr<CapabilityAttr>())
431 // Else check if any base classes have a capability.
432 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
433 CXXBasePaths BPaths(false, false);
434 if (CRD->lookupInBases([](const CXXBaseSpecifier *BS, CXXBasePath &P,
436 return BS->getType()->getAs<RecordType>()
437 ->getDecl()->hasAttr<CapabilityAttr>();
444 static bool checkTypedefTypeForCapability(QualType Ty) {
445 const auto *TD = Ty->getAs<TypedefType>();
449 TypedefNameDecl *TN = TD->getDecl();
453 return TN->hasAttr<CapabilityAttr>();
456 static bool typeHasCapability(Sema &S, QualType Ty) {
457 if (checkTypedefTypeForCapability(Ty))
460 if (checkRecordTypeForCapability(S, Ty))
466 static bool isCapabilityExpr(Sema &S, const Expr *Ex) {
467 // Capability expressions are simple expressions involving the boolean logic
468 // operators &&, || or !, a simple DeclRefExpr, CastExpr or a ParenExpr. Once
469 // a DeclRefExpr is found, its type should be checked to determine whether it
470 // is a capability or not.
472 if (const auto *E = dyn_cast<DeclRefExpr>(Ex))
473 return typeHasCapability(S, E->getType());
474 else if (const auto *E = dyn_cast<CastExpr>(Ex))
475 return isCapabilityExpr(S, E->getSubExpr());
476 else if (const auto *E = dyn_cast<ParenExpr>(Ex))
477 return isCapabilityExpr(S, E->getSubExpr());
478 else if (const auto *E = dyn_cast<UnaryOperator>(Ex)) {
479 if (E->getOpcode() == UO_LNot)
480 return isCapabilityExpr(S, E->getSubExpr());
482 } else if (const auto *E = dyn_cast<BinaryOperator>(Ex)) {
483 if (E->getOpcode() == BO_LAnd || E->getOpcode() == BO_LOr)
484 return isCapabilityExpr(S, E->getLHS()) &&
485 isCapabilityExpr(S, E->getRHS());
492 /// \brief Checks that all attribute arguments, starting from Sidx, resolve to
493 /// a capability object.
494 /// \param Sidx The attribute argument index to start checking with.
495 /// \param ParamIdxOk Whether an argument can be indexing into a function
497 static void checkAttrArgsAreCapabilityObjs(Sema &S, Decl *D,
498 const AttributeList &Attr,
499 SmallVectorImpl<Expr *> &Args,
501 bool ParamIdxOk = false) {
502 for (unsigned Idx = Sidx; Idx < Attr.getNumArgs(); ++Idx) {
503 Expr *ArgExp = Attr.getArgAsExpr(Idx);
505 if (ArgExp->isTypeDependent()) {
506 // FIXME -- need to check this again on template instantiation
507 Args.push_back(ArgExp);
511 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(ArgExp)) {
512 if (StrLit->getLength() == 0 ||
513 (StrLit->isAscii() && StrLit->getString() == StringRef("*"))) {
514 // Pass empty strings to the analyzer without warnings.
515 // Treat "*" as the universal lock.
516 Args.push_back(ArgExp);
520 // We allow constant strings to be used as a placeholder for expressions
521 // that are not valid C++ syntax, but warn that they are ignored.
522 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_ignored) <<
524 Args.push_back(ArgExp);
528 QualType ArgTy = ArgExp->getType();
530 // A pointer to member expression of the form &MyClass::mu is treated
531 // specially -- we need to look at the type of the member.
532 if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(ArgExp))
533 if (UOp->getOpcode() == UO_AddrOf)
534 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(UOp->getSubExpr()))
535 if (DRE->getDecl()->isCXXInstanceMember())
536 ArgTy = DRE->getDecl()->getType();
538 // First see if we can just cast to record type, or pointer to record type.
539 const RecordType *RT = getRecordType(ArgTy);
541 // Now check if we index into a record type function param.
542 if(!RT && ParamIdxOk) {
543 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
544 IntegerLiteral *IL = dyn_cast<IntegerLiteral>(ArgExp);
546 unsigned int NumParams = FD->getNumParams();
547 llvm::APInt ArgValue = IL->getValue();
548 uint64_t ParamIdxFromOne = ArgValue.getZExtValue();
549 uint64_t ParamIdxFromZero = ParamIdxFromOne - 1;
550 if(!ArgValue.isStrictlyPositive() || ParamIdxFromOne > NumParams) {
551 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_range)
552 << Attr.getName() << Idx + 1 << NumParams;
555 ArgTy = FD->getParamDecl(ParamIdxFromZero)->getType();
559 // If the type does not have a capability, see if the components of the
560 // expression have capabilities. This allows for writing C code where the
561 // capability may be on the type, and the expression is a capability
562 // boolean logic expression. Eg) requires_capability(A || B && !C)
563 if (!typeHasCapability(S, ArgTy) && !isCapabilityExpr(S, ArgExp))
564 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_argument_not_lockable)
565 << Attr.getName() << ArgTy;
567 Args.push_back(ArgExp);
571 //===----------------------------------------------------------------------===//
572 // Attribute Implementations
573 //===----------------------------------------------------------------------===//
575 static void handlePtGuardedVarAttr(Sema &S, Decl *D,
576 const AttributeList &Attr) {
577 if (!threadSafetyCheckIsPointer(S, D, Attr))
580 D->addAttr(::new (S.Context)
581 PtGuardedVarAttr(Attr.getRange(), S.Context,
582 Attr.getAttributeSpellingListIndex()));
585 static bool checkGuardedByAttrCommon(Sema &S, Decl *D,
586 const AttributeList &Attr,
588 SmallVector<Expr*, 1> Args;
589 // check that all arguments are lockable objects
590 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
591 unsigned Size = Args.size();
600 static void handleGuardedByAttr(Sema &S, Decl *D, const AttributeList &Attr) {
602 if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
605 D->addAttr(::new (S.Context) GuardedByAttr(Attr.getRange(), S.Context, Arg,
606 Attr.getAttributeSpellingListIndex()));
609 static void handlePtGuardedByAttr(Sema &S, Decl *D,
610 const AttributeList &Attr) {
612 if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
615 if (!threadSafetyCheckIsPointer(S, D, Attr))
618 D->addAttr(::new (S.Context) PtGuardedByAttr(Attr.getRange(),
620 Attr.getAttributeSpellingListIndex()));
623 static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D,
624 const AttributeList &Attr,
625 SmallVectorImpl<Expr *> &Args) {
626 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
629 // Check that this attribute only applies to lockable types.
630 QualType QT = cast<ValueDecl>(D)->getType();
631 if (!QT->isDependentType()) {
632 const RecordType *RT = getRecordType(QT);
633 if (!RT || !RT->getDecl()->hasAttr<CapabilityAttr>()) {
634 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_lockable)
640 // Check that all arguments are lockable objects.
641 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
648 static void handleAcquiredAfterAttr(Sema &S, Decl *D,
649 const AttributeList &Attr) {
650 SmallVector<Expr*, 1> Args;
651 if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
654 Expr **StartArg = &Args[0];
655 D->addAttr(::new (S.Context)
656 AcquiredAfterAttr(Attr.getRange(), S.Context,
657 StartArg, Args.size(),
658 Attr.getAttributeSpellingListIndex()));
661 static void handleAcquiredBeforeAttr(Sema &S, Decl *D,
662 const AttributeList &Attr) {
663 SmallVector<Expr*, 1> Args;
664 if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
667 Expr **StartArg = &Args[0];
668 D->addAttr(::new (S.Context)
669 AcquiredBeforeAttr(Attr.getRange(), S.Context,
670 StartArg, Args.size(),
671 Attr.getAttributeSpellingListIndex()));
674 static bool checkLockFunAttrCommon(Sema &S, Decl *D,
675 const AttributeList &Attr,
676 SmallVectorImpl<Expr *> &Args) {
677 // zero or more arguments ok
678 // check that all arguments are lockable objects
679 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true);
684 static void handleAssertSharedLockAttr(Sema &S, Decl *D,
685 const AttributeList &Attr) {
686 SmallVector<Expr*, 1> Args;
687 if (!checkLockFunAttrCommon(S, D, Attr, Args))
690 unsigned Size = Args.size();
691 Expr **StartArg = Size == 0 ? nullptr : &Args[0];
692 D->addAttr(::new (S.Context)
693 AssertSharedLockAttr(Attr.getRange(), S.Context, StartArg, Size,
694 Attr.getAttributeSpellingListIndex()));
697 static void handleAssertExclusiveLockAttr(Sema &S, Decl *D,
698 const AttributeList &Attr) {
699 SmallVector<Expr*, 1> Args;
700 if (!checkLockFunAttrCommon(S, D, Attr, Args))
703 unsigned Size = Args.size();
704 Expr **StartArg = Size == 0 ? nullptr : &Args[0];
705 D->addAttr(::new (S.Context)
706 AssertExclusiveLockAttr(Attr.getRange(), S.Context,
708 Attr.getAttributeSpellingListIndex()));
712 static bool checkTryLockFunAttrCommon(Sema &S, Decl *D,
713 const AttributeList &Attr,
714 SmallVectorImpl<Expr *> &Args) {
715 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
718 if (!isIntOrBool(Attr.getArgAsExpr(0))) {
719 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
720 << Attr.getName() << 1 << AANT_ArgumentIntOrBool;
724 // check that all arguments are lockable objects
725 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 1);
730 static void handleSharedTrylockFunctionAttr(Sema &S, Decl *D,
731 const AttributeList &Attr) {
732 SmallVector<Expr*, 2> Args;
733 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
736 D->addAttr(::new (S.Context)
737 SharedTrylockFunctionAttr(Attr.getRange(), S.Context,
738 Attr.getArgAsExpr(0),
739 Args.data(), Args.size(),
740 Attr.getAttributeSpellingListIndex()));
743 static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D,
744 const AttributeList &Attr) {
745 SmallVector<Expr*, 2> Args;
746 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
749 D->addAttr(::new (S.Context) ExclusiveTrylockFunctionAttr(
750 Attr.getRange(), S.Context, Attr.getArgAsExpr(0), Args.data(),
751 Args.size(), Attr.getAttributeSpellingListIndex()));
754 static void handleLockReturnedAttr(Sema &S, Decl *D,
755 const AttributeList &Attr) {
756 // check that the argument is lockable object
757 SmallVector<Expr*, 1> Args;
758 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
759 unsigned Size = Args.size();
763 D->addAttr(::new (S.Context)
764 LockReturnedAttr(Attr.getRange(), S.Context, Args[0],
765 Attr.getAttributeSpellingListIndex()));
768 static void handleLocksExcludedAttr(Sema &S, Decl *D,
769 const AttributeList &Attr) {
770 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
773 // check that all arguments are lockable objects
774 SmallVector<Expr*, 1> Args;
775 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
776 unsigned Size = Args.size();
779 Expr **StartArg = &Args[0];
781 D->addAttr(::new (S.Context)
782 LocksExcludedAttr(Attr.getRange(), S.Context, StartArg, Size,
783 Attr.getAttributeSpellingListIndex()));
786 static void handleEnableIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
787 Expr *Cond = Attr.getArgAsExpr(0);
788 if (!Cond->isTypeDependent()) {
789 ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
790 if (Converted.isInvalid())
792 Cond = Converted.get();
796 if (!S.checkStringLiteralArgumentAttr(Attr, 1, Msg))
799 SmallVector<PartialDiagnosticAt, 8> Diags;
800 if (!Cond->isValueDependent() &&
801 !Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(D),
803 S.Diag(Attr.getLoc(), diag::err_enable_if_never_constant_expr);
804 for (int I = 0, N = Diags.size(); I != N; ++I)
805 S.Diag(Diags[I].first, Diags[I].second);
809 D->addAttr(::new (S.Context)
810 EnableIfAttr(Attr.getRange(), S.Context, Cond, Msg,
811 Attr.getAttributeSpellingListIndex()));
814 static void handleConsumableAttr(Sema &S, Decl *D, const AttributeList &Attr) {
815 ConsumableAttr::ConsumedState DefaultState;
817 if (Attr.isArgIdent(0)) {
818 IdentifierLoc *IL = Attr.getArgAsIdent(0);
819 if (!ConsumableAttr::ConvertStrToConsumedState(IL->Ident->getName(),
821 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
822 << Attr.getName() << IL->Ident;
826 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
827 << Attr.getName() << AANT_ArgumentIdentifier;
831 D->addAttr(::new (S.Context)
832 ConsumableAttr(Attr.getRange(), S.Context, DefaultState,
833 Attr.getAttributeSpellingListIndex()));
837 static bool checkForConsumableClass(Sema &S, const CXXMethodDecl *MD,
838 const AttributeList &Attr) {
839 ASTContext &CurrContext = S.getASTContext();
840 QualType ThisType = MD->getThisType(CurrContext)->getPointeeType();
842 if (const CXXRecordDecl *RD = ThisType->getAsCXXRecordDecl()) {
843 if (!RD->hasAttr<ConsumableAttr>()) {
844 S.Diag(Attr.getLoc(), diag::warn_attr_on_unconsumable_class) <<
845 RD->getNameAsString();
855 static void handleCallableWhenAttr(Sema &S, Decl *D,
856 const AttributeList &Attr) {
857 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
860 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
863 SmallVector<CallableWhenAttr::ConsumedState, 3> States;
864 for (unsigned ArgIndex = 0; ArgIndex < Attr.getNumArgs(); ++ArgIndex) {
865 CallableWhenAttr::ConsumedState CallableState;
867 StringRef StateString;
869 if (Attr.isArgIdent(ArgIndex)) {
870 IdentifierLoc *Ident = Attr.getArgAsIdent(ArgIndex);
871 StateString = Ident->Ident->getName();
874 if (!S.checkStringLiteralArgumentAttr(Attr, ArgIndex, StateString, &Loc))
878 if (!CallableWhenAttr::ConvertStrToConsumedState(StateString,
880 S.Diag(Loc, diag::warn_attribute_type_not_supported)
881 << Attr.getName() << StateString;
885 States.push_back(CallableState);
888 D->addAttr(::new (S.Context)
889 CallableWhenAttr(Attr.getRange(), S.Context, States.data(),
890 States.size(), Attr.getAttributeSpellingListIndex()));
894 static void handleParamTypestateAttr(Sema &S, Decl *D,
895 const AttributeList &Attr) {
896 ParamTypestateAttr::ConsumedState ParamState;
898 if (Attr.isArgIdent(0)) {
899 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
900 StringRef StateString = Ident->Ident->getName();
902 if (!ParamTypestateAttr::ConvertStrToConsumedState(StateString,
904 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
905 << Attr.getName() << StateString;
909 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
910 Attr.getName() << AANT_ArgumentIdentifier;
914 // FIXME: This check is currently being done in the analysis. It can be
915 // enabled here only after the parser propagates attributes at
916 // template specialization definition, not declaration.
917 //QualType ReturnType = cast<ParmVarDecl>(D)->getType();
918 //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
920 //if (!RD || !RD->hasAttr<ConsumableAttr>()) {
921 // S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
922 // ReturnType.getAsString();
926 D->addAttr(::new (S.Context)
927 ParamTypestateAttr(Attr.getRange(), S.Context, ParamState,
928 Attr.getAttributeSpellingListIndex()));
932 static void handleReturnTypestateAttr(Sema &S, Decl *D,
933 const AttributeList &Attr) {
934 ReturnTypestateAttr::ConsumedState ReturnState;
936 if (Attr.isArgIdent(0)) {
937 IdentifierLoc *IL = Attr.getArgAsIdent(0);
938 if (!ReturnTypestateAttr::ConvertStrToConsumedState(IL->Ident->getName(),
940 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
941 << Attr.getName() << IL->Ident;
945 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
946 Attr.getName() << AANT_ArgumentIdentifier;
950 // FIXME: This check is currently being done in the analysis. It can be
951 // enabled here only after the parser propagates attributes at
952 // template specialization definition, not declaration.
953 //QualType ReturnType;
955 //if (const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D)) {
956 // ReturnType = Param->getType();
958 //} else if (const CXXConstructorDecl *Constructor =
959 // dyn_cast<CXXConstructorDecl>(D)) {
960 // ReturnType = Constructor->getThisType(S.getASTContext())->getPointeeType();
964 // ReturnType = cast<FunctionDecl>(D)->getCallResultType();
967 //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
969 //if (!RD || !RD->hasAttr<ConsumableAttr>()) {
970 // S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
971 // ReturnType.getAsString();
975 D->addAttr(::new (S.Context)
976 ReturnTypestateAttr(Attr.getRange(), S.Context, ReturnState,
977 Attr.getAttributeSpellingListIndex()));
981 static void handleSetTypestateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
982 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
985 SetTypestateAttr::ConsumedState NewState;
986 if (Attr.isArgIdent(0)) {
987 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
988 StringRef Param = Ident->Ident->getName();
989 if (!SetTypestateAttr::ConvertStrToConsumedState(Param, NewState)) {
990 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
991 << Attr.getName() << Param;
995 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
996 Attr.getName() << AANT_ArgumentIdentifier;
1000 D->addAttr(::new (S.Context)
1001 SetTypestateAttr(Attr.getRange(), S.Context, NewState,
1002 Attr.getAttributeSpellingListIndex()));
1005 static void handleTestTypestateAttr(Sema &S, Decl *D,
1006 const AttributeList &Attr) {
1007 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
1010 TestTypestateAttr::ConsumedState TestState;
1011 if (Attr.isArgIdent(0)) {
1012 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
1013 StringRef Param = Ident->Ident->getName();
1014 if (!TestTypestateAttr::ConvertStrToConsumedState(Param, TestState)) {
1015 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
1016 << Attr.getName() << Param;
1020 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
1021 Attr.getName() << AANT_ArgumentIdentifier;
1025 D->addAttr(::new (S.Context)
1026 TestTypestateAttr(Attr.getRange(), S.Context, TestState,
1027 Attr.getAttributeSpellingListIndex()));
1030 static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D,
1031 const AttributeList &Attr) {
1032 // Remember this typedef decl, we will need it later for diagnostics.
1033 S.ExtVectorDecls.push_back(cast<TypedefNameDecl>(D));
1036 static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1037 if (TagDecl *TD = dyn_cast<TagDecl>(D))
1038 TD->addAttr(::new (S.Context) PackedAttr(Attr.getRange(), S.Context,
1039 Attr.getAttributeSpellingListIndex()));
1040 else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
1041 // If the alignment is less than or equal to 8 bits, the packed attribute
1043 if (!FD->getType()->isDependentType() &&
1044 !FD->getType()->isIncompleteType() &&
1045 S.Context.getTypeAlign(FD->getType()) <= 8)
1046 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored_for_field_of_type)
1047 << Attr.getName() << FD->getType();
1049 FD->addAttr(::new (S.Context)
1050 PackedAttr(Attr.getRange(), S.Context,
1051 Attr.getAttributeSpellingListIndex()));
1053 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1056 static bool checkIBOutletCommon(Sema &S, Decl *D, const AttributeList &Attr) {
1057 // The IBOutlet/IBOutletCollection attributes only apply to instance
1058 // variables or properties of Objective-C classes. The outlet must also
1059 // have an object reference type.
1060 if (const ObjCIvarDecl *VD = dyn_cast<ObjCIvarDecl>(D)) {
1061 if (!VD->getType()->getAs<ObjCObjectPointerType>()) {
1062 S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
1063 << Attr.getName() << VD->getType() << 0;
1067 else if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
1068 if (!PD->getType()->getAs<ObjCObjectPointerType>()) {
1069 S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
1070 << Attr.getName() << PD->getType() << 1;
1075 S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName();
1082 static void handleIBOutlet(Sema &S, Decl *D, const AttributeList &Attr) {
1083 if (!checkIBOutletCommon(S, D, Attr))
1086 D->addAttr(::new (S.Context)
1087 IBOutletAttr(Attr.getRange(), S.Context,
1088 Attr.getAttributeSpellingListIndex()));
1091 static void handleIBOutletCollection(Sema &S, Decl *D,
1092 const AttributeList &Attr) {
1094 // The iboutletcollection attribute can have zero or one arguments.
1095 if (Attr.getNumArgs() > 1) {
1096 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
1097 << Attr.getName() << 1;
1101 if (!checkIBOutletCommon(S, D, Attr))
1106 if (Attr.hasParsedType())
1107 PT = Attr.getTypeArg();
1109 PT = S.getTypeName(S.Context.Idents.get("NSObject"), Attr.getLoc(),
1110 S.getScopeForContext(D->getDeclContext()->getParent()));
1112 S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << "NSObject";
1117 TypeSourceInfo *QTLoc = nullptr;
1118 QualType QT = S.GetTypeFromParser(PT, &QTLoc);
1120 QTLoc = S.Context.getTrivialTypeSourceInfo(QT, Attr.getLoc());
1122 // Diagnose use of non-object type in iboutletcollection attribute.
1123 // FIXME. Gnu attribute extension ignores use of builtin types in
1124 // attributes. So, __attribute__((iboutletcollection(char))) will be
1125 // treated as __attribute__((iboutletcollection())).
1126 if (!QT->isObjCIdType() && !QT->isObjCObjectType()) {
1127 S.Diag(Attr.getLoc(),
1128 QT->isBuiltinType() ? diag::err_iboutletcollection_builtintype
1129 : diag::err_iboutletcollection_type) << QT;
1133 D->addAttr(::new (S.Context)
1134 IBOutletCollectionAttr(Attr.getRange(), S.Context, QTLoc,
1135 Attr.getAttributeSpellingListIndex()));
1138 bool Sema::isValidPointerAttrType(QualType T, bool RefOkay) {
1140 if (T->isReferenceType())
1143 T = T.getNonReferenceType();
1146 // The nonnull attribute, and other similar attributes, can be applied to a
1147 // transparent union that contains a pointer type.
1148 if (const RecordType *UT = T->getAsUnionType()) {
1149 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) {
1150 RecordDecl *UD = UT->getDecl();
1151 for (const auto *I : UD->fields()) {
1152 QualType QT = I->getType();
1153 if (QT->isAnyPointerType() || QT->isBlockPointerType())
1159 return T->isAnyPointerType() || T->isBlockPointerType();
1162 static bool attrNonNullArgCheck(Sema &S, QualType T, const AttributeList &Attr,
1163 SourceRange AttrParmRange,
1164 SourceRange TypeRange,
1165 bool isReturnValue = false) {
1166 if (!S.isValidPointerAttrType(T)) {
1167 S.Diag(Attr.getLoc(), isReturnValue
1168 ? diag::warn_attribute_return_pointers_only
1169 : diag::warn_attribute_pointers_only)
1170 << Attr.getName() << AttrParmRange << TypeRange;
1176 static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1177 SmallVector<unsigned, 8> NonNullArgs;
1178 for (unsigned I = 0; I < Attr.getNumArgs(); ++I) {
1179 Expr *Ex = Attr.getArgAsExpr(I);
1181 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, I + 1, Ex, Idx))
1184 // Is the function argument a pointer type?
1185 if (Idx < getFunctionOrMethodNumParams(D) &&
1186 !attrNonNullArgCheck(S, getFunctionOrMethodParamType(D, Idx), Attr,
1187 Ex->getSourceRange(),
1188 getFunctionOrMethodParamRange(D, Idx)))
1191 NonNullArgs.push_back(Idx);
1194 // If no arguments were specified to __attribute__((nonnull)) then all pointer
1195 // arguments have a nonnull attribute; warn if there aren't any. Skip this
1196 // check if the attribute came from a macro expansion or a template
1198 if (NonNullArgs.empty() && Attr.getLoc().isFileID() &&
1199 S.ActiveTemplateInstantiations.empty()) {
1200 bool AnyPointers = isFunctionOrMethodVariadic(D);
1201 for (unsigned I = 0, E = getFunctionOrMethodNumParams(D);
1202 I != E && !AnyPointers; ++I) {
1203 QualType T = getFunctionOrMethodParamType(D, I);
1204 if (T->isDependentType() || S.isValidPointerAttrType(T))
1209 S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers);
1212 unsigned *Start = NonNullArgs.data();
1213 unsigned Size = NonNullArgs.size();
1214 llvm::array_pod_sort(Start, Start + Size);
1215 D->addAttr(::new (S.Context)
1216 NonNullAttr(Attr.getRange(), S.Context, Start, Size,
1217 Attr.getAttributeSpellingListIndex()));
1220 static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
1221 const AttributeList &Attr) {
1222 if (Attr.getNumArgs() > 0) {
1223 if (D->getFunctionType()) {
1224 handleNonNullAttr(S, D, Attr);
1226 S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_parm_no_args)
1227 << D->getSourceRange();
1232 // Is the argument a pointer type?
1233 if (!attrNonNullArgCheck(S, D->getType(), Attr, SourceRange(),
1234 D->getSourceRange()))
1237 D->addAttr(::new (S.Context)
1238 NonNullAttr(Attr.getRange(), S.Context, nullptr, 0,
1239 Attr.getAttributeSpellingListIndex()));
1242 static void handleReturnsNonNullAttr(Sema &S, Decl *D,
1243 const AttributeList &Attr) {
1244 QualType ResultType = getFunctionOrMethodResultType(D);
1245 SourceRange SR = getFunctionOrMethodResultSourceRange(D);
1246 if (!attrNonNullArgCheck(S, ResultType, Attr, SourceRange(), SR,
1247 /* isReturnValue */ true))
1250 D->addAttr(::new (S.Context)
1251 ReturnsNonNullAttr(Attr.getRange(), S.Context,
1252 Attr.getAttributeSpellingListIndex()));
1255 static void handleAssumeAlignedAttr(Sema &S, Decl *D,
1256 const AttributeList &Attr) {
1257 Expr *E = Attr.getArgAsExpr(0),
1258 *OE = Attr.getNumArgs() > 1 ? Attr.getArgAsExpr(1) : nullptr;
1259 S.AddAssumeAlignedAttr(Attr.getRange(), D, E, OE,
1260 Attr.getAttributeSpellingListIndex());
1263 void Sema::AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
1264 Expr *OE, unsigned SpellingListIndex) {
1265 QualType ResultType = getFunctionOrMethodResultType(D);
1266 SourceRange SR = getFunctionOrMethodResultSourceRange(D);
1268 AssumeAlignedAttr TmpAttr(AttrRange, Context, E, OE, SpellingListIndex);
1269 SourceLocation AttrLoc = AttrRange.getBegin();
1271 if (!isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
1272 Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
1273 << &TmpAttr << AttrRange << SR;
1277 if (!E->isValueDependent()) {
1279 if (!E->isIntegerConstantExpr(I, Context)) {
1281 Diag(AttrLoc, diag::err_attribute_argument_n_type)
1282 << &TmpAttr << 1 << AANT_ArgumentIntegerConstant
1283 << E->getSourceRange();
1285 Diag(AttrLoc, diag::err_attribute_argument_type)
1286 << &TmpAttr << AANT_ArgumentIntegerConstant
1287 << E->getSourceRange();
1291 if (!I.isPowerOf2()) {
1292 Diag(AttrLoc, diag::err_alignment_not_power_of_two)
1293 << E->getSourceRange();
1299 if (!OE->isValueDependent()) {
1301 if (!OE->isIntegerConstantExpr(I, Context)) {
1302 Diag(AttrLoc, diag::err_attribute_argument_n_type)
1303 << &TmpAttr << 2 << AANT_ArgumentIntegerConstant
1304 << OE->getSourceRange();
1310 D->addAttr(::new (Context)
1311 AssumeAlignedAttr(AttrRange, Context, E, OE, SpellingListIndex));
1314 static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
1315 // This attribute must be applied to a function declaration. The first
1316 // argument to the attribute must be an identifier, the name of the resource,
1317 // for example: malloc. The following arguments must be argument indexes, the
1318 // arguments must be of integer type for Returns, otherwise of pointer type.
1319 // The difference between Holds and Takes is that a pointer may still be used
1320 // after being held. free() should be __attribute((ownership_takes)), whereas
1321 // a list append function may well be __attribute((ownership_holds)).
1323 if (!AL.isArgIdent(0)) {
1324 S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
1325 << AL.getName() << 1 << AANT_ArgumentIdentifier;
1329 // Figure out our Kind.
1330 OwnershipAttr::OwnershipKind K =
1331 OwnershipAttr(AL.getLoc(), S.Context, nullptr, nullptr, 0,
1332 AL.getAttributeSpellingListIndex()).getOwnKind();
1336 case OwnershipAttr::Takes:
1337 case OwnershipAttr::Holds:
1338 if (AL.getNumArgs() < 2) {
1339 S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments)
1340 << AL.getName() << 2;
1344 case OwnershipAttr::Returns:
1345 if (AL.getNumArgs() > 2) {
1346 S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments)
1347 << AL.getName() << 1;
1353 IdentifierInfo *Module = AL.getArgAsIdent(0)->Ident;
1355 // Normalize the argument, __foo__ becomes foo.
1356 StringRef ModuleName = Module->getName();
1357 if (ModuleName.startswith("__") && ModuleName.endswith("__") &&
1358 ModuleName.size() > 4) {
1359 ModuleName = ModuleName.drop_front(2).drop_back(2);
1360 Module = &S.PP.getIdentifierTable().get(ModuleName);
1363 SmallVector<unsigned, 8> OwnershipArgs;
1364 for (unsigned i = 1; i < AL.getNumArgs(); ++i) {
1365 Expr *Ex = AL.getArgAsExpr(i);
1367 if (!checkFunctionOrMethodParameterIndex(S, D, AL, i, Ex, Idx))
1370 // Is the function argument a pointer type?
1371 QualType T = getFunctionOrMethodParamType(D, Idx);
1372 int Err = -1; // No error
1374 case OwnershipAttr::Takes:
1375 case OwnershipAttr::Holds:
1376 if (!T->isAnyPointerType() && !T->isBlockPointerType())
1379 case OwnershipAttr::Returns:
1380 if (!T->isIntegerType())
1385 S.Diag(AL.getLoc(), diag::err_ownership_type) << AL.getName() << Err
1386 << Ex->getSourceRange();
1390 // Check we don't have a conflict with another ownership attribute.
1391 for (const auto *I : D->specific_attrs<OwnershipAttr>()) {
1392 // Cannot have two ownership attributes of different kinds for the same
1394 if (I->getOwnKind() != K && I->args_end() !=
1395 std::find(I->args_begin(), I->args_end(), Idx)) {
1396 S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
1397 << AL.getName() << I;
1399 } else if (K == OwnershipAttr::Returns &&
1400 I->getOwnKind() == OwnershipAttr::Returns) {
1401 // A returns attribute conflicts with any other returns attribute using
1402 // a different index. Note, diagnostic reporting is 1-based, but stored
1403 // argument indexes are 0-based.
1404 if (std::find(I->args_begin(), I->args_end(), Idx) == I->args_end()) {
1405 S.Diag(I->getLocation(), diag::err_ownership_returns_index_mismatch)
1406 << *(I->args_begin()) + 1;
1408 S.Diag(AL.getLoc(), diag::note_ownership_returns_index_mismatch)
1409 << (unsigned)Idx + 1 << Ex->getSourceRange();
1414 OwnershipArgs.push_back(Idx);
1417 unsigned* start = OwnershipArgs.data();
1418 unsigned size = OwnershipArgs.size();
1419 llvm::array_pod_sort(start, start + size);
1421 D->addAttr(::new (S.Context)
1422 OwnershipAttr(AL.getLoc(), S.Context, Module, start, size,
1423 AL.getAttributeSpellingListIndex()));
1426 static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1427 // Check the attribute arguments.
1428 if (Attr.getNumArgs() > 1) {
1429 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
1430 << Attr.getName() << 1;
1434 NamedDecl *nd = cast<NamedDecl>(D);
1438 // static int a __attribute__((weakref ("v2")));
1439 // static int b() __attribute__((weakref ("f3")));
1441 // and ignores the attributes of
1443 // static int a __attribute__((weakref ("v2")));
1446 const DeclContext *Ctx = D->getDeclContext()->getRedeclContext();
1447 if (!Ctx->isFileContext()) {
1448 S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_global_context)
1453 // The GCC manual says
1455 // At present, a declaration to which `weakref' is attached can only
1460 // Without a TARGET,
1461 // given as an argument to `weakref' or to `alias', `weakref' is
1462 // equivalent to `weak'.
1464 // gcc 4.4.1 will accept
1465 // int a7 __attribute__((weakref));
1467 // int a7 __attribute__((weak));
1468 // This looks like a bug in gcc. We reject that for now. We should revisit
1469 // it if this behaviour is actually used.
1472 // static ((alias ("y"), weakref)).
1473 // Should we? How to check that weakref is before or after alias?
1475 // FIXME: it would be good for us to keep the WeakRefAttr as-written instead
1476 // of transforming it into an AliasAttr. The WeakRefAttr never uses the
1477 // StringRef parameter it was given anyway.
1479 if (Attr.getNumArgs() && S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1480 // GCC will accept anything as the argument of weakref. Should we
1481 // check for an existing decl?
1482 D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
1483 Attr.getAttributeSpellingListIndex()));
1485 D->addAttr(::new (S.Context)
1486 WeakRefAttr(Attr.getRange(), S.Context,
1487 Attr.getAttributeSpellingListIndex()));
1490 static void handleAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1492 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1495 if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
1496 S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_darwin);
1500 // Aliases should be on declarations, not definitions.
1501 if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
1502 if (FD->isThisDeclarationADefinition()) {
1503 S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << FD;
1507 const auto *VD = cast<VarDecl>(D);
1508 if (VD->isThisDeclarationADefinition() && VD->isExternallyVisible()) {
1509 S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << VD;
1514 // FIXME: check if target symbol exists in current file
1516 D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
1517 Attr.getAttributeSpellingListIndex()));
1520 static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1521 if (checkAttrMutualExclusion<HotAttr>(S, D, Attr))
1524 D->addAttr(::new (S.Context) ColdAttr(Attr.getRange(), S.Context,
1525 Attr.getAttributeSpellingListIndex()));
1528 static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1529 if (checkAttrMutualExclusion<ColdAttr>(S, D, Attr))
1532 D->addAttr(::new (S.Context) HotAttr(Attr.getRange(), S.Context,
1533 Attr.getAttributeSpellingListIndex()));
1536 static void handleTLSModelAttr(Sema &S, Decl *D,
1537 const AttributeList &Attr) {
1539 SourceLocation LiteralLoc;
1540 // Check that it is a string.
1541 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Model, &LiteralLoc))
1544 // Check that the value.
1545 if (Model != "global-dynamic" && Model != "local-dynamic"
1546 && Model != "initial-exec" && Model != "local-exec") {
1547 S.Diag(LiteralLoc, diag::err_attr_tlsmodel_arg);
1551 D->addAttr(::new (S.Context)
1552 TLSModelAttr(Attr.getRange(), S.Context, Model,
1553 Attr.getAttributeSpellingListIndex()));
1556 static void handleRestrictAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1557 QualType ResultType = getFunctionOrMethodResultType(D);
1558 if (ResultType->isAnyPointerType() || ResultType->isBlockPointerType()) {
1559 D->addAttr(::new (S.Context) RestrictAttr(
1560 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
1564 S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
1565 << Attr.getName() << getFunctionOrMethodResultSourceRange(D);
1568 static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1569 if (S.LangOpts.CPlusPlus) {
1570 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
1571 << Attr.getName() << AttributeLangSupport::Cpp;
1575 D->addAttr(::new (S.Context) CommonAttr(Attr.getRange(), S.Context,
1576 Attr.getAttributeSpellingListIndex()));
1579 static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &attr) {
1580 if (hasDeclarator(D)) return;
1582 if (S.CheckNoReturnAttr(attr)) return;
1584 if (!isa<ObjCMethodDecl>(D)) {
1585 S.Diag(attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1586 << attr.getName() << ExpectedFunctionOrMethod;
1590 D->addAttr(::new (S.Context)
1591 NoReturnAttr(attr.getRange(), S.Context,
1592 attr.getAttributeSpellingListIndex()));
1595 bool Sema::CheckNoReturnAttr(const AttributeList &attr) {
1596 if (!checkAttributeNumArgs(*this, attr, 0)) {
1604 static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D,
1605 const AttributeList &Attr) {
1607 // The checking path for 'noreturn' and 'analyzer_noreturn' are different
1608 // because 'analyzer_noreturn' does not impact the type.
1609 if (!isFunctionOrMethodOrBlock(D)) {
1610 ValueDecl *VD = dyn_cast<ValueDecl>(D);
1611 if (!VD || (!VD->getType()->isBlockPointerType() &&
1612 !VD->getType()->isFunctionPointerType())) {
1613 S.Diag(Attr.getLoc(),
1614 Attr.isCXX11Attribute() ? diag::err_attribute_wrong_decl_type
1615 : diag::warn_attribute_wrong_decl_type)
1616 << Attr.getName() << ExpectedFunctionMethodOrBlock;
1621 D->addAttr(::new (S.Context)
1622 AnalyzerNoReturnAttr(Attr.getRange(), S.Context,
1623 Attr.getAttributeSpellingListIndex()));
1626 // PS3 PPU-specific.
1627 static void handleVecReturnAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1629 Returning a Vector Class in Registers
1631 According to the PPU ABI specifications, a class with a single member of
1632 vector type is returned in memory when used as the return value of a function.
1633 This results in inefficient code when implementing vector classes. To return
1634 the value in a single vector register, add the vecreturn attribute to the
1635 class definition. This attribute is also applicable to struct types.
1641 __vector float xyzw;
1642 } __attribute__((vecreturn));
1644 Vector Add(Vector lhs, Vector rhs)
1647 result.xyzw = vec_add(lhs.xyzw, rhs.xyzw);
1648 return result; // This will be returned in a register
1651 if (VecReturnAttr *A = D->getAttr<VecReturnAttr>()) {
1652 S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << A;
1656 RecordDecl *record = cast<RecordDecl>(D);
1659 if (!isa<CXXRecordDecl>(record)) {
1660 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
1664 if (!cast<CXXRecordDecl>(record)->isPOD()) {
1665 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_pod_record);
1669 for (const auto *I : record->fields()) {
1670 if ((count == 1) || !I->getType()->isVectorType()) {
1671 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
1677 D->addAttr(::new (S.Context)
1678 VecReturnAttr(Attr.getRange(), S.Context,
1679 Attr.getAttributeSpellingListIndex()));
1682 static void handleDependencyAttr(Sema &S, Scope *Scope, Decl *D,
1683 const AttributeList &Attr) {
1684 if (isa<ParmVarDecl>(D)) {
1685 // [[carries_dependency]] can only be applied to a parameter if it is a
1686 // parameter of a function declaration or lambda.
1687 if (!(Scope->getFlags() & clang::Scope::FunctionDeclarationScope)) {
1688 S.Diag(Attr.getLoc(),
1689 diag::err_carries_dependency_param_not_function_decl);
1694 D->addAttr(::new (S.Context) CarriesDependencyAttr(
1695 Attr.getRange(), S.Context,
1696 Attr.getAttributeSpellingListIndex()));
1699 static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1700 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1701 if (VD->hasLocalStorage()) {
1702 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1705 } else if (!isFunctionOrMethod(D)) {
1706 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1707 << Attr.getName() << ExpectedVariableOrFunction;
1711 D->addAttr(::new (S.Context)
1712 UsedAttr(Attr.getRange(), S.Context,
1713 Attr.getAttributeSpellingListIndex()));
1716 static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1717 uint32_t priority = ConstructorAttr::DefaultPriority;
1718 if (Attr.getNumArgs() &&
1719 !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
1722 D->addAttr(::new (S.Context)
1723 ConstructorAttr(Attr.getRange(), S.Context, priority,
1724 Attr.getAttributeSpellingListIndex()));
1727 static void handleDestructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1728 uint32_t priority = DestructorAttr::DefaultPriority;
1729 if (Attr.getNumArgs() &&
1730 !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
1733 D->addAttr(::new (S.Context)
1734 DestructorAttr(Attr.getRange(), S.Context, priority,
1735 Attr.getAttributeSpellingListIndex()));
1738 template <typename AttrTy>
1739 static void handleAttrWithMessage(Sema &S, Decl *D,
1740 const AttributeList &Attr) {
1741 // Handle the case where the attribute has a text message.
1743 if (Attr.getNumArgs() == 1 && !S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1746 D->addAttr(::new (S.Context) AttrTy(Attr.getRange(), S.Context, Str,
1747 Attr.getAttributeSpellingListIndex()));
1750 static void handleObjCSuppresProtocolAttr(Sema &S, Decl *D,
1751 const AttributeList &Attr) {
1752 if (!cast<ObjCProtocolDecl>(D)->isThisDeclarationADefinition()) {
1753 S.Diag(Attr.getLoc(), diag::err_objc_attr_protocol_requires_definition)
1754 << Attr.getName() << Attr.getRange();
1758 D->addAttr(::new (S.Context)
1759 ObjCExplicitProtocolImplAttr(Attr.getRange(), S.Context,
1760 Attr.getAttributeSpellingListIndex()));
1763 static bool checkAvailabilityAttr(Sema &S, SourceRange Range,
1764 IdentifierInfo *Platform,
1765 VersionTuple Introduced,
1766 VersionTuple Deprecated,
1767 VersionTuple Obsoleted) {
1768 StringRef PlatformName
1769 = AvailabilityAttr::getPrettyPlatformName(Platform->getName());
1770 if (PlatformName.empty())
1771 PlatformName = Platform->getName();
1773 // Ensure that Introduced <= Deprecated <= Obsoleted (although not all
1774 // of these steps are needed).
1775 if (!Introduced.empty() && !Deprecated.empty() &&
1776 !(Introduced <= Deprecated)) {
1777 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
1778 << 1 << PlatformName << Deprecated.getAsString()
1779 << 0 << Introduced.getAsString();
1783 if (!Introduced.empty() && !Obsoleted.empty() &&
1784 !(Introduced <= Obsoleted)) {
1785 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
1786 << 2 << PlatformName << Obsoleted.getAsString()
1787 << 0 << Introduced.getAsString();
1791 if (!Deprecated.empty() && !Obsoleted.empty() &&
1792 !(Deprecated <= Obsoleted)) {
1793 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
1794 << 2 << PlatformName << Obsoleted.getAsString()
1795 << 1 << Deprecated.getAsString();
1802 /// \brief Check whether the two versions match.
1804 /// If either version tuple is empty, then they are assumed to match. If
1805 /// \p BeforeIsOkay is true, then \p X can be less than or equal to \p Y.
1806 static bool versionsMatch(const VersionTuple &X, const VersionTuple &Y,
1807 bool BeforeIsOkay) {
1808 if (X.empty() || Y.empty())
1814 if (BeforeIsOkay && X < Y)
1820 AvailabilityAttr *Sema::mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
1821 IdentifierInfo *Platform,
1822 VersionTuple Introduced,
1823 VersionTuple Deprecated,
1824 VersionTuple Obsoleted,
1828 unsigned AttrSpellingListIndex) {
1829 VersionTuple MergedIntroduced = Introduced;
1830 VersionTuple MergedDeprecated = Deprecated;
1831 VersionTuple MergedObsoleted = Obsoleted;
1832 bool FoundAny = false;
1834 if (D->hasAttrs()) {
1835 AttrVec &Attrs = D->getAttrs();
1836 for (unsigned i = 0, e = Attrs.size(); i != e;) {
1837 const AvailabilityAttr *OldAA = dyn_cast<AvailabilityAttr>(Attrs[i]);
1843 IdentifierInfo *OldPlatform = OldAA->getPlatform();
1844 if (OldPlatform != Platform) {
1850 VersionTuple OldIntroduced = OldAA->getIntroduced();
1851 VersionTuple OldDeprecated = OldAA->getDeprecated();
1852 VersionTuple OldObsoleted = OldAA->getObsoleted();
1853 bool OldIsUnavailable = OldAA->getUnavailable();
1855 if (!versionsMatch(OldIntroduced, Introduced, Override) ||
1856 !versionsMatch(Deprecated, OldDeprecated, Override) ||
1857 !versionsMatch(Obsoleted, OldObsoleted, Override) ||
1858 !(OldIsUnavailable == IsUnavailable ||
1859 (Override && !OldIsUnavailable && IsUnavailable))) {
1862 VersionTuple FirstVersion;
1863 VersionTuple SecondVersion;
1864 if (!versionsMatch(OldIntroduced, Introduced, Override)) {
1866 FirstVersion = OldIntroduced;
1867 SecondVersion = Introduced;
1868 } else if (!versionsMatch(Deprecated, OldDeprecated, Override)) {
1870 FirstVersion = Deprecated;
1871 SecondVersion = OldDeprecated;
1872 } else if (!versionsMatch(Obsoleted, OldObsoleted, Override)) {
1874 FirstVersion = Obsoleted;
1875 SecondVersion = OldObsoleted;
1879 Diag(OldAA->getLocation(),
1880 diag::warn_mismatched_availability_override_unavail)
1881 << AvailabilityAttr::getPrettyPlatformName(Platform->getName());
1883 Diag(OldAA->getLocation(),
1884 diag::warn_mismatched_availability_override)
1886 << AvailabilityAttr::getPrettyPlatformName(Platform->getName())
1887 << FirstVersion.getAsString() << SecondVersion.getAsString();
1889 Diag(Range.getBegin(), diag::note_overridden_method);
1891 Diag(OldAA->getLocation(), diag::warn_mismatched_availability);
1892 Diag(Range.getBegin(), diag::note_previous_attribute);
1895 Attrs.erase(Attrs.begin() + i);
1900 VersionTuple MergedIntroduced2 = MergedIntroduced;
1901 VersionTuple MergedDeprecated2 = MergedDeprecated;
1902 VersionTuple MergedObsoleted2 = MergedObsoleted;
1904 if (MergedIntroduced2.empty())
1905 MergedIntroduced2 = OldIntroduced;
1906 if (MergedDeprecated2.empty())
1907 MergedDeprecated2 = OldDeprecated;
1908 if (MergedObsoleted2.empty())
1909 MergedObsoleted2 = OldObsoleted;
1911 if (checkAvailabilityAttr(*this, OldAA->getRange(), Platform,
1912 MergedIntroduced2, MergedDeprecated2,
1913 MergedObsoleted2)) {
1914 Attrs.erase(Attrs.begin() + i);
1919 MergedIntroduced = MergedIntroduced2;
1920 MergedDeprecated = MergedDeprecated2;
1921 MergedObsoleted = MergedObsoleted2;
1927 MergedIntroduced == Introduced &&
1928 MergedDeprecated == Deprecated &&
1929 MergedObsoleted == Obsoleted)
1932 // Only create a new attribute if !Override, but we want to do
1934 if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
1935 MergedDeprecated, MergedObsoleted) &&
1937 return ::new (Context) AvailabilityAttr(Range, Context, Platform,
1938 Introduced, Deprecated,
1939 Obsoleted, IsUnavailable, Message,
1940 AttrSpellingListIndex);
1945 static void handleAvailabilityAttr(Sema &S, Decl *D,
1946 const AttributeList &Attr) {
1947 if (!checkAttributeNumArgs(S, Attr, 1))
1949 IdentifierLoc *Platform = Attr.getArgAsIdent(0);
1950 unsigned Index = Attr.getAttributeSpellingListIndex();
1952 IdentifierInfo *II = Platform->Ident;
1953 if (AvailabilityAttr::getPrettyPlatformName(II->getName()).empty())
1954 S.Diag(Platform->Loc, diag::warn_availability_unknown_platform)
1957 NamedDecl *ND = dyn_cast<NamedDecl>(D);
1959 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1963 AvailabilityChange Introduced = Attr.getAvailabilityIntroduced();
1964 AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated();
1965 AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted();
1966 bool IsUnavailable = Attr.getUnavailableLoc().isValid();
1968 if (const StringLiteral *SE =
1969 dyn_cast_or_null<StringLiteral>(Attr.getMessageExpr()))
1970 Str = SE->getString();
1972 AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND, Attr.getRange(), II,
1980 D->addAttr(NewAttr);
1984 static T *mergeVisibilityAttr(Sema &S, Decl *D, SourceRange range,
1985 typename T::VisibilityType value,
1986 unsigned attrSpellingListIndex) {
1987 T *existingAttr = D->getAttr<T>();
1989 typename T::VisibilityType existingValue = existingAttr->getVisibility();
1990 if (existingValue == value)
1992 S.Diag(existingAttr->getLocation(), diag::err_mismatched_visibility);
1993 S.Diag(range.getBegin(), diag::note_previous_attribute);
1996 return ::new (S.Context) T(range, S.Context, value, attrSpellingListIndex);
1999 VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range,
2000 VisibilityAttr::VisibilityType Vis,
2001 unsigned AttrSpellingListIndex) {
2002 return ::mergeVisibilityAttr<VisibilityAttr>(*this, D, Range, Vis,
2003 AttrSpellingListIndex);
2006 TypeVisibilityAttr *Sema::mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
2007 TypeVisibilityAttr::VisibilityType Vis,
2008 unsigned AttrSpellingListIndex) {
2009 return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, Range, Vis,
2010 AttrSpellingListIndex);
2013 static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr,
2014 bool isTypeVisibility) {
2015 // Visibility attributes don't mean anything on a typedef.
2016 if (isa<TypedefNameDecl>(D)) {
2017 S.Diag(Attr.getRange().getBegin(), diag::warn_attribute_ignored)
2022 // 'type_visibility' can only go on a type or namespace.
2023 if (isTypeVisibility &&
2024 !(isa<TagDecl>(D) ||
2025 isa<ObjCInterfaceDecl>(D) ||
2026 isa<NamespaceDecl>(D))) {
2027 S.Diag(Attr.getRange().getBegin(), diag::err_attribute_wrong_decl_type)
2028 << Attr.getName() << ExpectedTypeOrNamespace;
2032 // Check that the argument is a string literal.
2034 SourceLocation LiteralLoc;
2035 if (!S.checkStringLiteralArgumentAttr(Attr, 0, TypeStr, &LiteralLoc))
2038 VisibilityAttr::VisibilityType type;
2039 if (!VisibilityAttr::ConvertStrToVisibilityType(TypeStr, type)) {
2040 S.Diag(LiteralLoc, diag::warn_attribute_type_not_supported)
2041 << Attr.getName() << TypeStr;
2045 // Complain about attempts to use protected visibility on targets
2046 // (like Darwin) that don't support it.
2047 if (type == VisibilityAttr::Protected &&
2048 !S.Context.getTargetInfo().hasProtectedVisibility()) {
2049 S.Diag(Attr.getLoc(), diag::warn_attribute_protected_visibility);
2050 type = VisibilityAttr::Default;
2053 unsigned Index = Attr.getAttributeSpellingListIndex();
2054 clang::Attr *newAttr;
2055 if (isTypeVisibility) {
2056 newAttr = S.mergeTypeVisibilityAttr(D, Attr.getRange(),
2057 (TypeVisibilityAttr::VisibilityType) type,
2060 newAttr = S.mergeVisibilityAttr(D, Attr.getRange(), type, Index);
2063 D->addAttr(newAttr);
2066 static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl,
2067 const AttributeList &Attr) {
2068 ObjCMethodDecl *method = cast<ObjCMethodDecl>(decl);
2069 if (!Attr.isArgIdent(0)) {
2070 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2071 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
2075 IdentifierLoc *IL = Attr.getArgAsIdent(0);
2076 ObjCMethodFamilyAttr::FamilyKind F;
2077 if (!ObjCMethodFamilyAttr::ConvertStrToFamilyKind(IL->Ident->getName(), F)) {
2078 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << Attr.getName()
2083 if (F == ObjCMethodFamilyAttr::OMF_init &&
2084 !method->getReturnType()->isObjCObjectPointerType()) {
2085 S.Diag(method->getLocation(), diag::err_init_method_bad_return_type)
2086 << method->getReturnType();
2087 // Ignore the attribute.
2091 method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getRange(),
2093 Attr.getAttributeSpellingListIndex()));
2096 static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) {
2097 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
2098 QualType T = TD->getUnderlyingType();
2099 if (!T->isCARCBridgableType()) {
2100 S.Diag(TD->getLocation(), diag::err_nsobject_attribute);
2104 else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
2105 QualType T = PD->getType();
2106 if (!T->isCARCBridgableType()) {
2107 S.Diag(PD->getLocation(), diag::err_nsobject_attribute);
2112 // It is okay to include this attribute on properties, e.g.:
2114 // @property (retain, nonatomic) struct Bork *Q __attribute__((NSObject));
2116 // In this case it follows tradition and suppresses an error in the above
2118 S.Diag(D->getLocation(), diag::warn_nsobject_attribute);
2120 D->addAttr(::new (S.Context)
2121 ObjCNSObjectAttr(Attr.getRange(), S.Context,
2122 Attr.getAttributeSpellingListIndex()));
2125 static void handleObjCIndependentClass(Sema &S, Decl *D, const AttributeList &Attr) {
2126 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
2127 QualType T = TD->getUnderlyingType();
2128 if (!T->isObjCObjectPointerType()) {
2129 S.Diag(TD->getLocation(), diag::warn_ptr_independentclass_attribute);
2133 S.Diag(D->getLocation(), diag::warn_independentclass_attribute);
2136 D->addAttr(::new (S.Context)
2137 ObjCIndependentClassAttr(Attr.getRange(), S.Context,
2138 Attr.getAttributeSpellingListIndex()));
2141 static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2142 if (!Attr.isArgIdent(0)) {
2143 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2144 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
2148 IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
2149 BlocksAttr::BlockType type;
2150 if (!BlocksAttr::ConvertStrToBlockType(II->getName(), type)) {
2151 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
2152 << Attr.getName() << II;
2156 D->addAttr(::new (S.Context)
2157 BlocksAttr(Attr.getRange(), S.Context, type,
2158 Attr.getAttributeSpellingListIndex()));
2161 static void handleSentinelAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2162 unsigned sentinel = (unsigned)SentinelAttr::DefaultSentinel;
2163 if (Attr.getNumArgs() > 0) {
2164 Expr *E = Attr.getArgAsExpr(0);
2165 llvm::APSInt Idx(32);
2166 if (E->isTypeDependent() || E->isValueDependent() ||
2167 !E->isIntegerConstantExpr(Idx, S.Context)) {
2168 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2169 << Attr.getName() << 1 << AANT_ArgumentIntegerConstant
2170 << E->getSourceRange();
2174 if (Idx.isSigned() && Idx.isNegative()) {
2175 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero)
2176 << E->getSourceRange();
2180 sentinel = Idx.getZExtValue();
2183 unsigned nullPos = (unsigned)SentinelAttr::DefaultNullPos;
2184 if (Attr.getNumArgs() > 1) {
2185 Expr *E = Attr.getArgAsExpr(1);
2186 llvm::APSInt Idx(32);
2187 if (E->isTypeDependent() || E->isValueDependent() ||
2188 !E->isIntegerConstantExpr(Idx, S.Context)) {
2189 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2190 << Attr.getName() << 2 << AANT_ArgumentIntegerConstant
2191 << E->getSourceRange();
2194 nullPos = Idx.getZExtValue();
2196 if ((Idx.isSigned() && Idx.isNegative()) || nullPos > 1) {
2197 // FIXME: This error message could be improved, it would be nice
2198 // to say what the bounds actually are.
2199 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one)
2200 << E->getSourceRange();
2205 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2206 const FunctionType *FT = FD->getType()->castAs<FunctionType>();
2207 if (isa<FunctionNoProtoType>(FT)) {
2208 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_named_arguments);
2212 if (!cast<FunctionProtoType>(FT)->isVariadic()) {
2213 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
2216 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
2217 if (!MD->isVariadic()) {
2218 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
2221 } else if (BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
2222 if (!BD->isVariadic()) {
2223 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 1;
2226 } else if (const VarDecl *V = dyn_cast<VarDecl>(D)) {
2227 QualType Ty = V->getType();
2228 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
2229 const FunctionType *FT = Ty->isFunctionPointerType()
2230 ? D->getFunctionType()
2231 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
2232 if (!cast<FunctionProtoType>(FT)->isVariadic()) {
2233 int m = Ty->isFunctionPointerType() ? 0 : 1;
2234 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m;
2238 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2239 << Attr.getName() << ExpectedFunctionMethodOrBlock;
2243 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2244 << Attr.getName() << ExpectedFunctionMethodOrBlock;
2247 D->addAttr(::new (S.Context)
2248 SentinelAttr(Attr.getRange(), S.Context, sentinel, nullPos,
2249 Attr.getAttributeSpellingListIndex()));
2252 static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) {
2253 if (D->getFunctionType() &&
2254 D->getFunctionType()->getReturnType()->isVoidType()) {
2255 S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
2256 << Attr.getName() << 0;
2259 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
2260 if (MD->getReturnType()->isVoidType()) {
2261 S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
2262 << Attr.getName() << 1;
2266 D->addAttr(::new (S.Context)
2267 WarnUnusedResultAttr(Attr.getRange(), S.Context,
2268 Attr.getAttributeSpellingListIndex()));
2271 static void handleWeakImportAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2272 // weak_import only applies to variable & function declarations.
2274 if (!D->canBeWeakImported(isDef)) {
2276 S.Diag(Attr.getLoc(), diag::warn_attribute_invalid_on_definition)
2278 else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) ||
2279 (S.Context.getTargetInfo().getTriple().isOSDarwin() &&
2280 (isa<ObjCInterfaceDecl>(D) || isa<EnumDecl>(D)))) {
2281 // Nothing to warn about here.
2283 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2284 << Attr.getName() << ExpectedVariableOrFunction;
2289 D->addAttr(::new (S.Context)
2290 WeakImportAttr(Attr.getRange(), S.Context,
2291 Attr.getAttributeSpellingListIndex()));
2294 // Handles reqd_work_group_size and work_group_size_hint.
2295 template <typename WorkGroupAttr>
2296 static void handleWorkGroupSize(Sema &S, Decl *D,
2297 const AttributeList &Attr) {
2299 for (unsigned i = 0; i < 3; ++i) {
2300 const Expr *E = Attr.getArgAsExpr(i);
2301 if (!checkUInt32Argument(S, Attr, E, WGSize[i], i))
2303 if (WGSize[i] == 0) {
2304 S.Diag(Attr.getLoc(), diag::err_attribute_argument_is_zero)
2305 << Attr.getName() << E->getSourceRange();
2310 WorkGroupAttr *Existing = D->getAttr<WorkGroupAttr>();
2311 if (Existing && !(Existing->getXDim() == WGSize[0] &&
2312 Existing->getYDim() == WGSize[1] &&
2313 Existing->getZDim() == WGSize[2]))
2314 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
2316 D->addAttr(::new (S.Context) WorkGroupAttr(Attr.getRange(), S.Context,
2317 WGSize[0], WGSize[1], WGSize[2],
2318 Attr.getAttributeSpellingListIndex()));
2321 static void handleVecTypeHint(Sema &S, Decl *D, const AttributeList &Attr) {
2322 if (!Attr.hasParsedType()) {
2323 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
2324 << Attr.getName() << 1;
2328 TypeSourceInfo *ParmTSI = nullptr;
2329 QualType ParmType = S.GetTypeFromParser(Attr.getTypeArg(), &ParmTSI);
2330 assert(ParmTSI && "no type source info for attribute argument");
2332 if (!ParmType->isExtVectorType() && !ParmType->isFloatingType() &&
2333 (ParmType->isBooleanType() ||
2334 !ParmType->isIntegralType(S.getASTContext()))) {
2335 S.Diag(Attr.getLoc(), diag::err_attribute_argument_vec_type_hint)
2340 if (VecTypeHintAttr *A = D->getAttr<VecTypeHintAttr>()) {
2341 if (!S.Context.hasSameType(A->getTypeHint(), ParmType)) {
2342 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
2347 D->addAttr(::new (S.Context) VecTypeHintAttr(Attr.getLoc(), S.Context,
2349 Attr.getAttributeSpellingListIndex()));
2352 SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range,
2354 unsigned AttrSpellingListIndex) {
2355 if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) {
2356 if (ExistingAttr->getName() == Name)
2358 Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section);
2359 Diag(Range.getBegin(), diag::note_previous_attribute);
2362 return ::new (Context) SectionAttr(Range, Context, Name,
2363 AttrSpellingListIndex);
2366 bool Sema::checkSectionName(SourceLocation LiteralLoc, StringRef SecName) {
2367 std::string Error = Context.getTargetInfo().isValidSectionSpecifier(SecName);
2368 if (!Error.empty()) {
2369 Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target) << Error;
2375 static void handleSectionAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2376 // Make sure that there is a string literal as the sections's single
2379 SourceLocation LiteralLoc;
2380 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &LiteralLoc))
2383 if (!S.checkSectionName(LiteralLoc, Str))
2386 // If the target wants to validate the section specifier, make it happen.
2387 std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(Str);
2388 if (!Error.empty()) {
2389 S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target)
2394 unsigned Index = Attr.getAttributeSpellingListIndex();
2395 SectionAttr *NewAttr = S.mergeSectionAttr(D, Attr.getRange(), Str, Index);
2397 D->addAttr(NewAttr);
2401 static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2402 VarDecl *VD = cast<VarDecl>(D);
2403 if (!VD->hasLocalStorage()) {
2404 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
2408 Expr *E = Attr.getArgAsExpr(0);
2409 SourceLocation Loc = E->getExprLoc();
2410 FunctionDecl *FD = nullptr;
2411 DeclarationNameInfo NI;
2413 // gcc only allows for simple identifiers. Since we support more than gcc, we
2414 // will warn the user.
2415 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
2416 if (DRE->hasQualifier())
2417 S.Diag(Loc, diag::warn_cleanup_ext);
2418 FD = dyn_cast<FunctionDecl>(DRE->getDecl());
2419 NI = DRE->getNameInfo();
2421 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 1
2425 } else if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
2426 if (ULE->hasExplicitTemplateArgs())
2427 S.Diag(Loc, diag::warn_cleanup_ext);
2428 FD = S.ResolveSingleFunctionTemplateSpecialization(ULE, true);
2429 NI = ULE->getNameInfo();
2431 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 2
2433 if (ULE->getType() == S.Context.OverloadTy)
2434 S.NoteAllOverloadCandidates(ULE);
2438 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 0;
2442 if (FD->getNumParams() != 1) {
2443 S.Diag(Loc, diag::err_attribute_cleanup_func_must_take_one_arg)
2448 // We're currently more strict than GCC about what function types we accept.
2449 // If this ever proves to be a problem it should be easy to fix.
2450 QualType Ty = S.Context.getPointerType(VD->getType());
2451 QualType ParamTy = FD->getParamDecl(0)->getType();
2452 if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(),
2453 ParamTy, Ty) != Sema::Compatible) {
2454 S.Diag(Loc, diag::err_attribute_cleanup_func_arg_incompatible_type)
2455 << NI.getName() << ParamTy << Ty;
2459 D->addAttr(::new (S.Context)
2460 CleanupAttr(Attr.getRange(), S.Context, FD,
2461 Attr.getAttributeSpellingListIndex()));
2464 /// Handle __attribute__((format_arg((idx)))) attribute based on
2465 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
2466 static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2467 Expr *IdxExpr = Attr.getArgAsExpr(0);
2469 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 1, IdxExpr, Idx))
2472 // make sure the format string is really a string
2473 QualType Ty = getFunctionOrMethodParamType(D, Idx);
2475 bool not_nsstring_type = !isNSStringType(Ty, S.Context);
2476 if (not_nsstring_type &&
2477 !isCFStringType(Ty, S.Context) &&
2478 (!Ty->isPointerType() ||
2479 !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
2480 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2481 << (not_nsstring_type ? "a string type" : "an NSString")
2482 << IdxExpr->getSourceRange() << getFunctionOrMethodParamRange(D, 0);
2485 Ty = getFunctionOrMethodResultType(D);
2486 if (!isNSStringType(Ty, S.Context) &&
2487 !isCFStringType(Ty, S.Context) &&
2488 (!Ty->isPointerType() ||
2489 !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
2490 S.Diag(Attr.getLoc(), diag::err_format_attribute_result_not)
2491 << (not_nsstring_type ? "string type" : "NSString")
2492 << IdxExpr->getSourceRange() << getFunctionOrMethodParamRange(D, 0);
2496 // We cannot use the Idx returned from checkFunctionOrMethodParameterIndex
2497 // because that has corrected for the implicit this parameter, and is zero-
2498 // based. The attribute expects what the user wrote explicitly.
2500 IdxExpr->EvaluateAsInt(Val, S.Context);
2502 D->addAttr(::new (S.Context)
2503 FormatArgAttr(Attr.getRange(), S.Context, Val.getZExtValue(),
2504 Attr.getAttributeSpellingListIndex()));
2507 enum FormatAttrKind {
2516 /// getFormatAttrKind - Map from format attribute names to supported format
2518 static FormatAttrKind getFormatAttrKind(StringRef Format) {
2519 return llvm::StringSwitch<FormatAttrKind>(Format)
2520 // Check for formats that get handled specially.
2521 .Case("NSString", NSStringFormat)
2522 .Case("CFString", CFStringFormat)
2523 .Case("strftime", StrftimeFormat)
2525 // Otherwise, check for supported formats.
2526 .Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
2527 .Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
2528 .Case("kprintf", SupportedFormat) // OpenBSD.
2529 .Case("freebsd_kprintf", SupportedFormat) // FreeBSD.
2530 .Case("os_trace", SupportedFormat)
2532 .Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
2533 .Default(InvalidFormat);
2536 /// Handle __attribute__((init_priority(priority))) attributes based on
2537 /// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html
2538 static void handleInitPriorityAttr(Sema &S, Decl *D,
2539 const AttributeList &Attr) {
2540 if (!S.getLangOpts().CPlusPlus) {
2541 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
2545 if (S.getCurFunctionOrMethodDecl()) {
2546 S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
2550 QualType T = cast<VarDecl>(D)->getType();
2551 if (S.Context.getAsArrayType(T))
2552 T = S.Context.getBaseElementType(T);
2553 if (!T->getAs<RecordType>()) {
2554 S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
2559 Expr *E = Attr.getArgAsExpr(0);
2560 uint32_t prioritynum;
2561 if (!checkUInt32Argument(S, Attr, E, prioritynum)) {
2566 if (prioritynum < 101 || prioritynum > 65535) {
2567 S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range)
2568 << E->getSourceRange();
2572 D->addAttr(::new (S.Context)
2573 InitPriorityAttr(Attr.getRange(), S.Context, prioritynum,
2574 Attr.getAttributeSpellingListIndex()));
2577 FormatAttr *Sema::mergeFormatAttr(Decl *D, SourceRange Range,
2578 IdentifierInfo *Format, int FormatIdx,
2580 unsigned AttrSpellingListIndex) {
2581 // Check whether we already have an equivalent format attribute.
2582 for (auto *F : D->specific_attrs<FormatAttr>()) {
2583 if (F->getType() == Format &&
2584 F->getFormatIdx() == FormatIdx &&
2585 F->getFirstArg() == FirstArg) {
2586 // If we don't have a valid location for this attribute, adopt the
2588 if (F->getLocation().isInvalid())
2594 return ::new (Context) FormatAttr(Range, Context, Format, FormatIdx,
2595 FirstArg, AttrSpellingListIndex);
2598 /// Handle __attribute__((format(type,idx,firstarg))) attributes based on
2599 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
2600 static void handleFormatAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2601 if (!Attr.isArgIdent(0)) {
2602 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2603 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
2607 // In C++ the implicit 'this' function parameter also counts, and they are
2608 // counted from one.
2609 bool HasImplicitThisParam = isInstanceMethod(D);
2610 unsigned NumArgs = getFunctionOrMethodNumParams(D) + HasImplicitThisParam;
2612 IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
2613 StringRef Format = II->getName();
2615 // Normalize the argument, __foo__ becomes foo.
2616 if (Format.startswith("__") && Format.endswith("__")) {
2617 Format = Format.substr(2, Format.size() - 4);
2618 // If we've modified the string name, we need a new identifier for it.
2619 II = &S.Context.Idents.get(Format);
2622 // Check for supported formats.
2623 FormatAttrKind Kind = getFormatAttrKind(Format);
2625 if (Kind == IgnoredFormat)
2628 if (Kind == InvalidFormat) {
2629 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
2630 << Attr.getName() << II->getName();
2634 // checks for the 2nd argument
2635 Expr *IdxExpr = Attr.getArgAsExpr(1);
2637 if (!checkUInt32Argument(S, Attr, IdxExpr, Idx, 2))
2640 if (Idx < 1 || Idx > NumArgs) {
2641 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
2642 << Attr.getName() << 2 << IdxExpr->getSourceRange();
2646 // FIXME: Do we need to bounds check?
2647 unsigned ArgIdx = Idx - 1;
2649 if (HasImplicitThisParam) {
2651 S.Diag(Attr.getLoc(),
2652 diag::err_format_attribute_implicit_this_format_string)
2653 << IdxExpr->getSourceRange();
2659 // make sure the format string is really a string
2660 QualType Ty = getFunctionOrMethodParamType(D, ArgIdx);
2662 if (Kind == CFStringFormat) {
2663 if (!isCFStringType(Ty, S.Context)) {
2664 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2665 << "a CFString" << IdxExpr->getSourceRange()
2666 << getFunctionOrMethodParamRange(D, ArgIdx);
2669 } else if (Kind == NSStringFormat) {
2670 // FIXME: do we need to check if the type is NSString*? What are the
2672 if (!isNSStringType(Ty, S.Context)) {
2673 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2674 << "an NSString" << IdxExpr->getSourceRange()
2675 << getFunctionOrMethodParamRange(D, ArgIdx);
2678 } else if (!Ty->isPointerType() ||
2679 !Ty->getAs<PointerType>()->getPointeeType()->isCharType()) {
2680 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2681 << "a string type" << IdxExpr->getSourceRange()
2682 << getFunctionOrMethodParamRange(D, ArgIdx);
2686 // check the 3rd argument
2687 Expr *FirstArgExpr = Attr.getArgAsExpr(2);
2689 if (!checkUInt32Argument(S, Attr, FirstArgExpr, FirstArg, 3))
2692 // check if the function is variadic if the 3rd argument non-zero
2693 if (FirstArg != 0) {
2694 if (isFunctionOrMethodVariadic(D)) {
2695 ++NumArgs; // +1 for ...
2697 S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic);
2702 // strftime requires FirstArg to be 0 because it doesn't read from any
2703 // variable the input is just the current time + the format string.
2704 if (Kind == StrftimeFormat) {
2705 if (FirstArg != 0) {
2706 S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter)
2707 << FirstArgExpr->getSourceRange();
2710 // if 0 it disables parameter checking (to use with e.g. va_list)
2711 } else if (FirstArg != 0 && FirstArg != NumArgs) {
2712 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
2713 << Attr.getName() << 3 << FirstArgExpr->getSourceRange();
2717 FormatAttr *NewAttr = S.mergeFormatAttr(D, Attr.getRange(), II,
2719 Attr.getAttributeSpellingListIndex());
2721 D->addAttr(NewAttr);
2724 static void handleTransparentUnionAttr(Sema &S, Decl *D,
2725 const AttributeList &Attr) {
2726 // Try to find the underlying union declaration.
2727 RecordDecl *RD = nullptr;
2728 TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
2729 if (TD && TD->getUnderlyingType()->isUnionType())
2730 RD = TD->getUnderlyingType()->getAsUnionType()->getDecl();
2732 RD = dyn_cast<RecordDecl>(D);
2734 if (!RD || !RD->isUnion()) {
2735 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2736 << Attr.getName() << ExpectedUnion;
2740 if (!RD->isCompleteDefinition()) {
2741 S.Diag(Attr.getLoc(),
2742 diag::warn_transparent_union_attribute_not_definition);
2746 RecordDecl::field_iterator Field = RD->field_begin(),
2747 FieldEnd = RD->field_end();
2748 if (Field == FieldEnd) {
2749 S.Diag(Attr.getLoc(), diag::warn_transparent_union_attribute_zero_fields);
2753 FieldDecl *FirstField = *Field;
2754 QualType FirstType = FirstField->getType();
2755 if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) {
2756 S.Diag(FirstField->getLocation(),
2757 diag::warn_transparent_union_attribute_floating)
2758 << FirstType->isVectorType() << FirstType;
2762 uint64_t FirstSize = S.Context.getTypeSize(FirstType);
2763 uint64_t FirstAlign = S.Context.getTypeAlign(FirstType);
2764 for (; Field != FieldEnd; ++Field) {
2765 QualType FieldType = Field->getType();
2766 // FIXME: this isn't fully correct; we also need to test whether the
2767 // members of the union would all have the same calling convention as the
2768 // first member of the union. Checking just the size and alignment isn't
2769 // sufficient (consider structs passed on the stack instead of in registers
2771 if (S.Context.getTypeSize(FieldType) != FirstSize ||
2772 S.Context.getTypeAlign(FieldType) > FirstAlign) {
2773 // Warn if we drop the attribute.
2774 bool isSize = S.Context.getTypeSize(FieldType) != FirstSize;
2775 unsigned FieldBits = isSize? S.Context.getTypeSize(FieldType)
2776 : S.Context.getTypeAlign(FieldType);
2777 S.Diag(Field->getLocation(),
2778 diag::warn_transparent_union_attribute_field_size_align)
2779 << isSize << Field->getDeclName() << FieldBits;
2780 unsigned FirstBits = isSize? FirstSize : FirstAlign;
2781 S.Diag(FirstField->getLocation(),
2782 diag::note_transparent_union_first_field_size_align)
2783 << isSize << FirstBits;
2788 RD->addAttr(::new (S.Context)
2789 TransparentUnionAttr(Attr.getRange(), S.Context,
2790 Attr.getAttributeSpellingListIndex()));
2793 static void handleAnnotateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2794 // Make sure that there is a string literal as the annotation's single
2797 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
2800 // Don't duplicate annotations that are already set.
2801 for (const auto *I : D->specific_attrs<AnnotateAttr>()) {
2802 if (I->getAnnotation() == Str)
2806 D->addAttr(::new (S.Context)
2807 AnnotateAttr(Attr.getRange(), S.Context, Str,
2808 Attr.getAttributeSpellingListIndex()));
2811 static void handleAlignValueAttr(Sema &S, Decl *D,
2812 const AttributeList &Attr) {
2813 S.AddAlignValueAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
2814 Attr.getAttributeSpellingListIndex());
2817 void Sema::AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
2818 unsigned SpellingListIndex) {
2819 AlignValueAttr TmpAttr(AttrRange, Context, E, SpellingListIndex);
2820 SourceLocation AttrLoc = AttrRange.getBegin();
2823 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
2824 T = TD->getUnderlyingType();
2825 else if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
2828 llvm_unreachable("Unknown decl type for align_value");
2830 if (!T->isDependentType() && !T->isAnyPointerType() &&
2831 !T->isReferenceType() && !T->isMemberPointerType()) {
2832 Diag(AttrLoc, diag::warn_attribute_pointer_or_reference_only)
2833 << &TmpAttr /*TmpAttr.getName()*/ << T << D->getSourceRange();
2837 if (!E->isValueDependent()) {
2838 llvm::APSInt Alignment(32);
2840 = VerifyIntegerConstantExpression(E, &Alignment,
2841 diag::err_align_value_attribute_argument_not_int,
2842 /*AllowFold*/ false);
2843 if (ICE.isInvalid())
2846 if (!Alignment.isPowerOf2()) {
2847 Diag(AttrLoc, diag::err_alignment_not_power_of_two)
2848 << E->getSourceRange();
2852 D->addAttr(::new (Context)
2853 AlignValueAttr(AttrRange, Context, ICE.get(),
2854 SpellingListIndex));
2858 // Save dependent expressions in the AST to be instantiated.
2859 D->addAttr(::new (Context) AlignValueAttr(TmpAttr));
2863 static void handleAlignedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2864 // check the attribute arguments.
2865 if (Attr.getNumArgs() > 1) {
2866 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
2867 << Attr.getName() << 1;
2871 if (Attr.getNumArgs() == 0) {
2872 D->addAttr(::new (S.Context) AlignedAttr(Attr.getRange(), S.Context,
2873 true, nullptr, Attr.getAttributeSpellingListIndex()));
2877 Expr *E = Attr.getArgAsExpr(0);
2878 if (Attr.isPackExpansion() && !E->containsUnexpandedParameterPack()) {
2879 S.Diag(Attr.getEllipsisLoc(),
2880 diag::err_pack_expansion_without_parameter_packs);
2884 if (!Attr.isPackExpansion() && S.DiagnoseUnexpandedParameterPack(E))
2887 if (E->isValueDependent()) {
2888 if (const auto *TND = dyn_cast<TypedefNameDecl>(D)) {
2889 if (!TND->getUnderlyingType()->isDependentType()) {
2890 S.Diag(Attr.getLoc(), diag::err_alignment_dependent_typedef_name)
2891 << E->getSourceRange();
2897 S.AddAlignedAttr(Attr.getRange(), D, E, Attr.getAttributeSpellingListIndex(),
2898 Attr.isPackExpansion());
2901 void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
2902 unsigned SpellingListIndex, bool IsPackExpansion) {
2903 AlignedAttr TmpAttr(AttrRange, Context, true, E, SpellingListIndex);
2904 SourceLocation AttrLoc = AttrRange.getBegin();
2906 // C++11 alignas(...) and C11 _Alignas(...) have additional requirements.
2907 if (TmpAttr.isAlignas()) {
2908 // C++11 [dcl.align]p1:
2909 // An alignment-specifier may be applied to a variable or to a class
2910 // data member, but it shall not be applied to a bit-field, a function
2911 // parameter, the formal parameter of a catch clause, or a variable
2912 // declared with the register storage class specifier. An
2913 // alignment-specifier may also be applied to the declaration of a class
2914 // or enumeration type.
2916 // An alignment attribute shall not be specified in a declaration of
2917 // a typedef, or a bit-field, or a function, or a parameter, or an
2918 // object declared with the register storage-class specifier.
2920 if (isa<ParmVarDecl>(D)) {
2922 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
2923 if (VD->getStorageClass() == SC_Register)
2925 if (VD->isExceptionVariable())
2927 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
2928 if (FD->isBitField())
2930 } else if (!isa<TagDecl>(D)) {
2931 Diag(AttrLoc, diag::err_attribute_wrong_decl_type) << &TmpAttr
2932 << (TmpAttr.isC11() ? ExpectedVariableOrField
2933 : ExpectedVariableFieldOrTag);
2936 if (DiagKind != -1) {
2937 Diag(AttrLoc, diag::err_alignas_attribute_wrong_decl_type)
2938 << &TmpAttr << DiagKind;
2943 if (E->isTypeDependent() || E->isValueDependent()) {
2944 // Save dependent expressions in the AST to be instantiated.
2945 AlignedAttr *AA = ::new (Context) AlignedAttr(TmpAttr);
2946 AA->setPackExpansion(IsPackExpansion);
2951 // FIXME: Cache the number on the Attr object?
2952 llvm::APSInt Alignment(32);
2954 = VerifyIntegerConstantExpression(E, &Alignment,
2955 diag::err_aligned_attribute_argument_not_int,
2956 /*AllowFold*/ false);
2957 if (ICE.isInvalid())
2960 // C++11 [dcl.align]p2:
2961 // -- if the constant expression evaluates to zero, the alignment
2962 // specifier shall have no effect
2964 // An alignment specification of zero has no effect.
2965 if (!(TmpAttr.isAlignas() && !Alignment) &&
2966 !llvm::isPowerOf2_64(Alignment.getZExtValue())) {
2967 Diag(AttrLoc, diag::err_alignment_not_power_of_two)
2968 << E->getSourceRange();
2972 // Alignment calculations can wrap around if it's greater than 2**28.
2973 unsigned MaxValidAlignment = TmpAttr.isDeclspec() ? 8192 : 268435456;
2974 if (Alignment.getZExtValue() > MaxValidAlignment) {
2975 Diag(AttrLoc, diag::err_attribute_aligned_too_great) << MaxValidAlignment
2976 << E->getSourceRange();
2980 AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, true,
2981 ICE.get(), SpellingListIndex);
2982 AA->setPackExpansion(IsPackExpansion);
2986 void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *TS,
2987 unsigned SpellingListIndex, bool IsPackExpansion) {
2988 // FIXME: Cache the number on the Attr object if non-dependent?
2989 // FIXME: Perform checking of type validity
2990 AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, false, TS,
2992 AA->setPackExpansion(IsPackExpansion);
2996 void Sema::CheckAlignasUnderalignment(Decl *D) {
2997 assert(D->hasAttrs() && "no attributes on decl");
2999 QualType UnderlyingTy, DiagTy;
3000 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
3001 UnderlyingTy = DiagTy = VD->getType();
3003 UnderlyingTy = DiagTy = Context.getTagDeclType(cast<TagDecl>(D));
3004 if (EnumDecl *ED = dyn_cast<EnumDecl>(D))
3005 UnderlyingTy = ED->getIntegerType();
3007 if (DiagTy->isDependentType() || DiagTy->isIncompleteType())
3010 // C++11 [dcl.align]p5, C11 6.7.5/4:
3011 // The combined effect of all alignment attributes in a declaration shall
3012 // not specify an alignment that is less strict than the alignment that
3013 // would otherwise be required for the entity being declared.
3014 AlignedAttr *AlignasAttr = nullptr;
3016 for (auto *I : D->specific_attrs<AlignedAttr>()) {
3017 if (I->isAlignmentDependent())
3021 Align = std::max(Align, I->getAlignment(Context));
3024 if (AlignasAttr && Align) {
3025 CharUnits RequestedAlign = Context.toCharUnitsFromBits(Align);
3026 CharUnits NaturalAlign = Context.getTypeAlignInChars(UnderlyingTy);
3027 if (NaturalAlign > RequestedAlign)
3028 Diag(AlignasAttr->getLocation(), diag::err_alignas_underaligned)
3029 << DiagTy << (unsigned)NaturalAlign.getQuantity();
3033 bool Sema::checkMSInheritanceAttrOnDefinition(
3034 CXXRecordDecl *RD, SourceRange Range, bool BestCase,
3035 MSInheritanceAttr::Spelling SemanticSpelling) {
3036 assert(RD->hasDefinition() && "RD has no definition!");
3038 // We may not have seen base specifiers or any virtual methods yet. We will
3039 // have to wait until the record is defined to catch any mismatches.
3040 if (!RD->getDefinition()->isCompleteDefinition())
3043 // The unspecified model never matches what a definition could need.
3044 if (SemanticSpelling == MSInheritanceAttr::Keyword_unspecified_inheritance)
3048 if (RD->calculateInheritanceModel() == SemanticSpelling)
3051 if (RD->calculateInheritanceModel() <= SemanticSpelling)
3055 Diag(Range.getBegin(), diag::err_mismatched_ms_inheritance)
3056 << 0 /*definition*/;
3057 Diag(RD->getDefinition()->getLocation(), diag::note_defined_here)
3058 << RD->getNameAsString();
3062 /// handleModeAttr - This attribute modifies the width of a decl with primitive
3065 /// Despite what would be logical, the mode attribute is a decl attribute, not a
3066 /// type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 'G' be
3067 /// HImode, not an intermediate pointer.
3068 static void handleModeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3069 // This attribute isn't documented, but glibc uses it. It changes
3070 // the width of an int or unsigned int to the specified size.
3071 if (!Attr.isArgIdent(0)) {
3072 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName()
3073 << AANT_ArgumentIdentifier;
3077 IdentifierInfo *Name = Attr.getArgAsIdent(0)->Ident;
3078 StringRef Str = Name->getName();
3080 // Normalize the attribute name, __foo__ becomes foo.
3081 if (Str.startswith("__") && Str.endswith("__"))
3082 Str = Str.substr(2, Str.size() - 4);
3084 unsigned DestWidth = 0;
3085 bool IntegerMode = true;
3086 bool ComplexMode = false;
3087 switch (Str.size()) {
3090 case 'Q': DestWidth = 8; break;
3091 case 'H': DestWidth = 16; break;
3092 case 'S': DestWidth = 32; break;
3093 case 'D': DestWidth = 64; break;
3094 case 'X': DestWidth = 96; break;
3095 case 'T': DestWidth = 128; break;
3097 if (Str[1] == 'F') {
3098 IntegerMode = false;
3099 } else if (Str[1] == 'C') {
3100 IntegerMode = false;
3102 } else if (Str[1] != 'I') {
3107 // FIXME: glibc uses 'word' to define register_t; this is narrower than a
3108 // pointer on PIC16 and other embedded platforms.
3110 DestWidth = S.Context.getTargetInfo().getPointerWidth(0);
3111 else if (Str == "byte")
3112 DestWidth = S.Context.getTargetInfo().getCharWidth();
3115 if (Str == "pointer")
3116 DestWidth = S.Context.getTargetInfo().getPointerWidth(0);
3119 if (Str == "unwind_word")
3120 DestWidth = S.Context.getTargetInfo().getUnwindWordWidth();
3125 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
3126 OldTy = TD->getUnderlyingType();
3127 else if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
3128 OldTy = VD->getType();
3130 S.Diag(D->getLocation(), diag::err_attr_wrong_decl)
3131 << Attr.getName() << Attr.getRange();
3135 if (!OldTy->getAs<BuiltinType>() && !OldTy->isComplexType())
3136 S.Diag(Attr.getLoc(), diag::err_mode_not_primitive);
3137 else if (IntegerMode) {
3138 if (!OldTy->isIntegralOrEnumerationType())
3139 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
3140 } else if (ComplexMode) {
3141 if (!OldTy->isComplexType())
3142 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
3144 if (!OldTy->isFloatingType())
3145 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
3148 // FIXME: Sync this with InitializePredefinedMacros; we need to match int8_t
3149 // and friends, at least with glibc.
3150 // FIXME: Make sure floating-point mappings are accurate
3151 // FIXME: Support XF and TF types
3153 S.Diag(Attr.getLoc(), diag::err_machine_mode) << 0 /*Unknown*/ << Name;
3160 NewTy = S.Context.getIntTypeForBitwidth(DestWidth,
3161 OldTy->isSignedIntegerType());
3163 NewTy = S.Context.getRealTypeForBitwidth(DestWidth);
3165 if (NewTy.isNull()) {
3166 S.Diag(Attr.getLoc(), diag::err_machine_mode) << 1 /*Unsupported*/ << Name;
3171 NewTy = S.Context.getComplexType(NewTy);
3174 // Install the new type.
3175 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
3176 TD->setModedTypeSourceInfo(TD->getTypeSourceInfo(), NewTy);
3178 cast<ValueDecl>(D)->setType(NewTy);
3180 D->addAttr(::new (S.Context)
3181 ModeAttr(Attr.getRange(), S.Context, Name,
3182 Attr.getAttributeSpellingListIndex()));
3185 static void handleNoDebugAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3186 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
3187 if (!VD->hasGlobalStorage())
3188 S.Diag(Attr.getLoc(),
3189 diag::warn_attribute_requires_functions_or_static_globals)
3191 } else if (!isFunctionOrMethod(D)) {
3192 S.Diag(Attr.getLoc(),
3193 diag::warn_attribute_requires_functions_or_static_globals)
3198 D->addAttr(::new (S.Context)
3199 NoDebugAttr(Attr.getRange(), S.Context,
3200 Attr.getAttributeSpellingListIndex()));
3203 AlwaysInlineAttr *Sema::mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
3204 IdentifierInfo *Ident,
3205 unsigned AttrSpellingListIndex) {
3206 if (OptimizeNoneAttr *Optnone = D->getAttr<OptimizeNoneAttr>()) {
3207 Diag(Range.getBegin(), diag::warn_attribute_ignored) << Ident;
3208 Diag(Optnone->getLocation(), diag::note_conflicting_attribute);
3212 if (D->hasAttr<AlwaysInlineAttr>())
3215 return ::new (Context) AlwaysInlineAttr(Range, Context,
3216 AttrSpellingListIndex);
3219 MinSizeAttr *Sema::mergeMinSizeAttr(Decl *D, SourceRange Range,
3220 unsigned AttrSpellingListIndex) {
3221 if (OptimizeNoneAttr *Optnone = D->getAttr<OptimizeNoneAttr>()) {
3222 Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'minsize'";
3223 Diag(Optnone->getLocation(), diag::note_conflicting_attribute);
3227 if (D->hasAttr<MinSizeAttr>())
3230 return ::new (Context) MinSizeAttr(Range, Context, AttrSpellingListIndex);
3233 OptimizeNoneAttr *Sema::mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
3234 unsigned AttrSpellingListIndex) {
3235 if (AlwaysInlineAttr *Inline = D->getAttr<AlwaysInlineAttr>()) {
3236 Diag(Inline->getLocation(), diag::warn_attribute_ignored) << Inline;
3237 Diag(Range.getBegin(), diag::note_conflicting_attribute);
3238 D->dropAttr<AlwaysInlineAttr>();
3240 if (MinSizeAttr *MinSize = D->getAttr<MinSizeAttr>()) {
3241 Diag(MinSize->getLocation(), diag::warn_attribute_ignored) << MinSize;
3242 Diag(Range.getBegin(), diag::note_conflicting_attribute);
3243 D->dropAttr<MinSizeAttr>();
3246 if (D->hasAttr<OptimizeNoneAttr>())
3249 return ::new (Context) OptimizeNoneAttr(Range, Context,
3250 AttrSpellingListIndex);
3253 static void handleAlwaysInlineAttr(Sema &S, Decl *D,
3254 const AttributeList &Attr) {
3255 if (AlwaysInlineAttr *Inline = S.mergeAlwaysInlineAttr(
3256 D, Attr.getRange(), Attr.getName(),
3257 Attr.getAttributeSpellingListIndex()))
3261 static void handleMinSizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3262 if (MinSizeAttr *MinSize = S.mergeMinSizeAttr(
3263 D, Attr.getRange(), Attr.getAttributeSpellingListIndex()))
3264 D->addAttr(MinSize);
3267 static void handleOptimizeNoneAttr(Sema &S, Decl *D,
3268 const AttributeList &Attr) {
3269 if (OptimizeNoneAttr *Optnone = S.mergeOptimizeNoneAttr(
3270 D, Attr.getRange(), Attr.getAttributeSpellingListIndex()))
3271 D->addAttr(Optnone);
3274 static void handleGlobalAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3275 FunctionDecl *FD = cast<FunctionDecl>(D);
3276 if (!FD->getReturnType()->isVoidType()) {
3277 SourceRange RTRange = FD->getReturnTypeSourceRange();
3278 S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return)
3280 << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "void")
3285 D->addAttr(::new (S.Context)
3286 CUDAGlobalAttr(Attr.getRange(), S.Context,
3287 Attr.getAttributeSpellingListIndex()));
3290 static void handleGNUInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3291 FunctionDecl *Fn = cast<FunctionDecl>(D);
3292 if (!Fn->isInlineSpecified()) {
3293 S.Diag(Attr.getLoc(), diag::warn_gnu_inline_attribute_requires_inline);
3297 D->addAttr(::new (S.Context)
3298 GNUInlineAttr(Attr.getRange(), S.Context,
3299 Attr.getAttributeSpellingListIndex()));
3302 static void handleCallConvAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3303 if (hasDeclarator(D)) return;
3305 // Diagnostic is emitted elsewhere: here we store the (valid) Attr
3306 // in the Decl node for syntactic reasoning, e.g., pretty-printing.
3308 if (S.CheckCallingConvAttr(Attr, CC, /*FD*/nullptr))
3311 if (!isa<ObjCMethodDecl>(D)) {
3312 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
3313 << Attr.getName() << ExpectedFunctionOrMethod;
3317 switch (Attr.getKind()) {
3318 case AttributeList::AT_FastCall:
3319 D->addAttr(::new (S.Context)
3320 FastCallAttr(Attr.getRange(), S.Context,
3321 Attr.getAttributeSpellingListIndex()));
3323 case AttributeList::AT_StdCall:
3324 D->addAttr(::new (S.Context)
3325 StdCallAttr(Attr.getRange(), S.Context,
3326 Attr.getAttributeSpellingListIndex()));
3328 case AttributeList::AT_ThisCall:
3329 D->addAttr(::new (S.Context)
3330 ThisCallAttr(Attr.getRange(), S.Context,
3331 Attr.getAttributeSpellingListIndex()));
3333 case AttributeList::AT_CDecl:
3334 D->addAttr(::new (S.Context)
3335 CDeclAttr(Attr.getRange(), S.Context,
3336 Attr.getAttributeSpellingListIndex()));
3338 case AttributeList::AT_Pascal:
3339 D->addAttr(::new (S.Context)
3340 PascalAttr(Attr.getRange(), S.Context,
3341 Attr.getAttributeSpellingListIndex()));
3343 case AttributeList::AT_VectorCall:
3344 D->addAttr(::new (S.Context)
3345 VectorCallAttr(Attr.getRange(), S.Context,
3346 Attr.getAttributeSpellingListIndex()));
3348 case AttributeList::AT_MSABI:
3349 D->addAttr(::new (S.Context)
3350 MSABIAttr(Attr.getRange(), S.Context,
3351 Attr.getAttributeSpellingListIndex()));
3353 case AttributeList::AT_SysVABI:
3354 D->addAttr(::new (S.Context)
3355 SysVABIAttr(Attr.getRange(), S.Context,
3356 Attr.getAttributeSpellingListIndex()));
3358 case AttributeList::AT_Pcs: {
3359 PcsAttr::PCSType PCS;
3362 PCS = PcsAttr::AAPCS;
3365 PCS = PcsAttr::AAPCS_VFP;
3368 llvm_unreachable("unexpected calling convention in pcs attribute");
3371 D->addAttr(::new (S.Context)
3372 PcsAttr(Attr.getRange(), S.Context, PCS,
3373 Attr.getAttributeSpellingListIndex()));
3376 case AttributeList::AT_IntelOclBicc:
3377 D->addAttr(::new (S.Context)
3378 IntelOclBiccAttr(Attr.getRange(), S.Context,
3379 Attr.getAttributeSpellingListIndex()));
3383 llvm_unreachable("unexpected attribute kind");
3387 bool Sema::CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC,
3388 const FunctionDecl *FD) {
3389 if (attr.isInvalid())
3392 unsigned ReqArgs = attr.getKind() == AttributeList::AT_Pcs ? 1 : 0;
3393 if (!checkAttributeNumArgs(*this, attr, ReqArgs)) {
3398 // TODO: diagnose uses of these conventions on the wrong target.
3399 switch (attr.getKind()) {
3400 case AttributeList::AT_CDecl: CC = CC_C; break;
3401 case AttributeList::AT_FastCall: CC = CC_X86FastCall; break;
3402 case AttributeList::AT_StdCall: CC = CC_X86StdCall; break;
3403 case AttributeList::AT_ThisCall: CC = CC_X86ThisCall; break;
3404 case AttributeList::AT_Pascal: CC = CC_X86Pascal; break;
3405 case AttributeList::AT_VectorCall: CC = CC_X86VectorCall; break;
3406 case AttributeList::AT_MSABI:
3407 CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_C :
3410 case AttributeList::AT_SysVABI:
3411 CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_X86_64SysV :
3414 case AttributeList::AT_Pcs: {
3416 if (!checkStringLiteralArgumentAttr(attr, 0, StrRef)) {
3420 if (StrRef == "aapcs") {
3423 } else if (StrRef == "aapcs-vfp") {
3429 Diag(attr.getLoc(), diag::err_invalid_pcs);
3432 case AttributeList::AT_IntelOclBicc: CC = CC_IntelOclBicc; break;
3433 default: llvm_unreachable("unexpected attribute kind");
3436 const TargetInfo &TI = Context.getTargetInfo();
3437 TargetInfo::CallingConvCheckResult A = TI.checkCallingConvention(CC);
3438 if (A != TargetInfo::CCCR_OK) {
3439 if (A == TargetInfo::CCCR_Warning)
3440 Diag(attr.getLoc(), diag::warn_cconv_ignored) << attr.getName();
3442 // This convention is not valid for the target. Use the default function or
3443 // method calling convention.
3444 TargetInfo::CallingConvMethodType MT = TargetInfo::CCMT_Unknown;
3446 MT = FD->isCXXInstanceMember() ? TargetInfo::CCMT_Member :
3447 TargetInfo::CCMT_NonMember;
3448 CC = TI.getDefaultCallingConv(MT);
3454 /// Checks a regparm attribute, returning true if it is ill-formed and
3455 /// otherwise setting numParams to the appropriate value.
3456 bool Sema::CheckRegparmAttr(const AttributeList &Attr, unsigned &numParams) {
3457 if (Attr.isInvalid())
3460 if (!checkAttributeNumArgs(*this, Attr, 1)) {
3466 Expr *NumParamsExpr = Attr.getArgAsExpr(0);
3467 if (!checkUInt32Argument(*this, Attr, NumParamsExpr, NP)) {
3472 if (Context.getTargetInfo().getRegParmMax() == 0) {
3473 Diag(Attr.getLoc(), diag::err_attribute_regparm_wrong_platform)
3474 << NumParamsExpr->getSourceRange();
3480 if (numParams > Context.getTargetInfo().getRegParmMax()) {
3481 Diag(Attr.getLoc(), diag::err_attribute_regparm_invalid_number)
3482 << Context.getTargetInfo().getRegParmMax() << NumParamsExpr->getSourceRange();
3490 // Checks whether an argument of launch_bounds attribute is acceptable
3491 // May output an error.
3492 static bool checkLaunchBoundsArgument(Sema &S, Expr *E,
3493 const CUDALaunchBoundsAttr &Attr,
3494 const unsigned Idx) {
3496 if (S.DiagnoseUnexpandedParameterPack(E))
3499 // Accept template arguments for now as they depend on something else.
3500 // We'll get to check them when they eventually get instantiated.
3501 if (E->isValueDependent())
3505 if (!E->isIntegerConstantExpr(I, S.Context)) {
3506 S.Diag(E->getExprLoc(), diag::err_attribute_argument_n_type)
3507 << &Attr << Idx << AANT_ArgumentIntegerConstant << E->getSourceRange();
3510 // Make sure we can fit it in 32 bits.
3511 if (!I.isIntN(32)) {
3512 S.Diag(E->getExprLoc(), diag::err_ice_too_large) << I.toString(10, false)
3513 << 32 << /* Unsigned */ 1;
3517 S.Diag(E->getExprLoc(), diag::warn_attribute_argument_n_negative)
3518 << &Attr << Idx << E->getSourceRange();
3523 void Sema::AddLaunchBoundsAttr(SourceRange AttrRange, Decl *D, Expr *MaxThreads,
3524 Expr *MinBlocks, unsigned SpellingListIndex) {
3525 CUDALaunchBoundsAttr TmpAttr(AttrRange, Context, MaxThreads, MinBlocks,
3528 if (!checkLaunchBoundsArgument(*this, MaxThreads, TmpAttr, 0))
3531 if (MinBlocks && !checkLaunchBoundsArgument(*this, MinBlocks, TmpAttr, 1))
3534 D->addAttr(::new (Context) CUDALaunchBoundsAttr(
3535 AttrRange, Context, MaxThreads, MinBlocks, SpellingListIndex));
3538 static void handleLaunchBoundsAttr(Sema &S, Decl *D,
3539 const AttributeList &Attr) {
3540 if (!checkAttributeAtLeastNumArgs(S, Attr, 1) ||
3541 !checkAttributeAtMostNumArgs(S, Attr, 2))
3544 S.AddLaunchBoundsAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
3545 Attr.getNumArgs() > 1 ? Attr.getArgAsExpr(1) : nullptr,
3546 Attr.getAttributeSpellingListIndex());
3549 static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
3550 const AttributeList &Attr) {
3551 if (!Attr.isArgIdent(0)) {
3552 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
3553 << Attr.getName() << /* arg num = */ 1 << AANT_ArgumentIdentifier;
3557 if (!checkAttributeNumArgs(S, Attr, 3))
3560 IdentifierInfo *ArgumentKind = Attr.getArgAsIdent(0)->Ident;
3562 if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) {
3563 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
3564 << Attr.getName() << ExpectedFunctionOrMethod;
3568 uint64_t ArgumentIdx;
3569 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 2, Attr.getArgAsExpr(1),
3573 uint64_t TypeTagIdx;
3574 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 3, Attr.getArgAsExpr(2),
3578 bool IsPointer = (Attr.getName()->getName() == "pointer_with_type_tag");
3580 // Ensure that buffer has a pointer type.
3581 QualType BufferTy = getFunctionOrMethodParamType(D, ArgumentIdx);
3582 if (!BufferTy->isPointerType()) {
3583 S.Diag(Attr.getLoc(), diag::err_attribute_pointers_only)
3588 D->addAttr(::new (S.Context)
3589 ArgumentWithTypeTagAttr(Attr.getRange(), S.Context, ArgumentKind,
3590 ArgumentIdx, TypeTagIdx, IsPointer,
3591 Attr.getAttributeSpellingListIndex()));
3594 static void handleTypeTagForDatatypeAttr(Sema &S, Decl *D,
3595 const AttributeList &Attr) {
3596 if (!Attr.isArgIdent(0)) {
3597 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
3598 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
3602 if (!checkAttributeNumArgs(S, Attr, 1))
3605 if (!isa<VarDecl>(D)) {
3606 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
3607 << Attr.getName() << ExpectedVariable;
3611 IdentifierInfo *PointerKind = Attr.getArgAsIdent(0)->Ident;
3612 TypeSourceInfo *MatchingCTypeLoc = nullptr;
3613 S.GetTypeFromParser(Attr.getMatchingCType(), &MatchingCTypeLoc);
3614 assert(MatchingCTypeLoc && "no type source info for attribute argument");
3616 D->addAttr(::new (S.Context)
3617 TypeTagForDatatypeAttr(Attr.getRange(), S.Context, PointerKind,
3619 Attr.getLayoutCompatible(),
3620 Attr.getMustBeNull(),
3621 Attr.getAttributeSpellingListIndex()));
3624 //===----------------------------------------------------------------------===//
3625 // Checker-specific attribute handlers.
3626 //===----------------------------------------------------------------------===//
3628 static bool isValidSubjectOfNSReturnsRetainedAttribute(QualType type) {
3629 return type->isDependentType() ||
3630 type->isObjCRetainableType();
3633 static bool isValidSubjectOfNSAttribute(Sema &S, QualType type) {
3634 return type->isDependentType() ||
3635 type->isObjCObjectPointerType() ||
3636 S.Context.isObjCNSObjectType(type);
3638 static bool isValidSubjectOfCFAttribute(Sema &S, QualType type) {
3639 return type->isDependentType() ||
3640 type->isPointerType() ||
3641 isValidSubjectOfNSAttribute(S, type);
3644 static void handleNSConsumedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3645 ParmVarDecl *param = cast<ParmVarDecl>(D);
3648 if (Attr.getKind() == AttributeList::AT_NSConsumed) {
3649 typeOK = isValidSubjectOfNSAttribute(S, param->getType());
3652 typeOK = isValidSubjectOfCFAttribute(S, param->getType());
3657 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type)
3658 << Attr.getRange() << Attr.getName() << cf;
3663 param->addAttr(::new (S.Context)
3664 CFConsumedAttr(Attr.getRange(), S.Context,
3665 Attr.getAttributeSpellingListIndex()));
3667 param->addAttr(::new (S.Context)
3668 NSConsumedAttr(Attr.getRange(), S.Context,
3669 Attr.getAttributeSpellingListIndex()));
3672 static void handleNSReturnsRetainedAttr(Sema &S, Decl *D,
3673 const AttributeList &Attr) {
3675 QualType returnType;
3677 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
3678 returnType = MD->getReturnType();
3679 else if (S.getLangOpts().ObjCAutoRefCount && hasDeclarator(D) &&
3680 (Attr.getKind() == AttributeList::AT_NSReturnsRetained))
3681 return; // ignore: was handled as a type attribute
3682 else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D))
3683 returnType = PD->getType();
3684 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
3685 returnType = FD->getReturnType();
3687 S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type)
3688 << Attr.getRange() << Attr.getName()
3689 << ExpectedFunctionOrMethod;
3695 switch (Attr.getKind()) {
3696 default: llvm_unreachable("invalid ownership attribute");
3697 case AttributeList::AT_NSReturnsRetained:
3698 typeOK = isValidSubjectOfNSReturnsRetainedAttribute(returnType);
3702 case AttributeList::AT_NSReturnsAutoreleased:
3703 case AttributeList::AT_NSReturnsNotRetained:
3704 typeOK = isValidSubjectOfNSAttribute(S, returnType);
3708 case AttributeList::AT_CFReturnsRetained:
3709 case AttributeList::AT_CFReturnsNotRetained:
3710 typeOK = isValidSubjectOfCFAttribute(S, returnType);
3716 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
3717 << Attr.getRange() << Attr.getName() << isa<ObjCMethodDecl>(D) << cf;
3721 switch (Attr.getKind()) {
3723 llvm_unreachable("invalid ownership attribute");
3724 case AttributeList::AT_NSReturnsAutoreleased:
3725 D->addAttr(::new (S.Context) NSReturnsAutoreleasedAttr(
3726 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
3728 case AttributeList::AT_CFReturnsNotRetained:
3729 D->addAttr(::new (S.Context) CFReturnsNotRetainedAttr(
3730 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
3732 case AttributeList::AT_NSReturnsNotRetained:
3733 D->addAttr(::new (S.Context) NSReturnsNotRetainedAttr(
3734 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
3736 case AttributeList::AT_CFReturnsRetained:
3737 D->addAttr(::new (S.Context) CFReturnsRetainedAttr(
3738 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
3740 case AttributeList::AT_NSReturnsRetained:
3741 D->addAttr(::new (S.Context) NSReturnsRetainedAttr(
3742 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
3747 static void handleObjCReturnsInnerPointerAttr(Sema &S, Decl *D,
3748 const AttributeList &attr) {
3749 const int EP_ObjCMethod = 1;
3750 const int EP_ObjCProperty = 2;
3752 SourceLocation loc = attr.getLoc();
3753 QualType resultType;
3754 if (isa<ObjCMethodDecl>(D))
3755 resultType = cast<ObjCMethodDecl>(D)->getReturnType();
3757 resultType = cast<ObjCPropertyDecl>(D)->getType();
3759 if (!resultType->isReferenceType() &&
3760 (!resultType->isPointerType() || resultType->isObjCRetainableType())) {
3761 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
3764 << (isa<ObjCMethodDecl>(D) ? EP_ObjCMethod : EP_ObjCProperty)
3765 << /*non-retainable pointer*/ 2;
3767 // Drop the attribute.
3771 D->addAttr(::new (S.Context) ObjCReturnsInnerPointerAttr(
3772 attr.getRange(), S.Context, attr.getAttributeSpellingListIndex()));
3775 static void handleObjCRequiresSuperAttr(Sema &S, Decl *D,
3776 const AttributeList &attr) {
3777 ObjCMethodDecl *method = cast<ObjCMethodDecl>(D);
3779 DeclContext *DC = method->getDeclContext();
3780 if (const ObjCProtocolDecl *PDecl = dyn_cast_or_null<ObjCProtocolDecl>(DC)) {
3781 S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol)
3782 << attr.getName() << 0;
3783 S.Diag(PDecl->getLocation(), diag::note_protocol_decl);
3786 if (method->getMethodFamily() == OMF_dealloc) {
3787 S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol)
3788 << attr.getName() << 1;
3792 method->addAttr(::new (S.Context)
3793 ObjCRequiresSuperAttr(attr.getRange(), S.Context,
3794 attr.getAttributeSpellingListIndex()));
3797 static void handleCFAuditedTransferAttr(Sema &S, Decl *D,
3798 const AttributeList &Attr) {
3799 if (checkAttrMutualExclusion<CFUnknownTransferAttr>(S, D, Attr))
3802 D->addAttr(::new (S.Context)
3803 CFAuditedTransferAttr(Attr.getRange(), S.Context,
3804 Attr.getAttributeSpellingListIndex()));
3807 static void handleCFUnknownTransferAttr(Sema &S, Decl *D,
3808 const AttributeList &Attr) {
3809 if (checkAttrMutualExclusion<CFAuditedTransferAttr>(S, D, Attr))
3812 D->addAttr(::new (S.Context)
3813 CFUnknownTransferAttr(Attr.getRange(), S.Context,
3814 Attr.getAttributeSpellingListIndex()));
3817 static void handleObjCBridgeAttr(Sema &S, Scope *Sc, Decl *D,
3818 const AttributeList &Attr) {
3819 IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr;
3822 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
3826 // Typedefs only allow objc_bridge(id) and have some additional checking.
3827 if (auto TD = dyn_cast<TypedefNameDecl>(D)) {
3828 if (!Parm->Ident->isStr("id")) {
3829 S.Diag(Attr.getLoc(), diag::err_objc_attr_typedef_not_id)
3834 // Only allow 'cv void *'.
3835 QualType T = TD->getUnderlyingType();
3836 if (!T->isVoidPointerType()) {
3837 S.Diag(Attr.getLoc(), diag::err_objc_attr_typedef_not_void_pointer);
3842 D->addAttr(::new (S.Context)
3843 ObjCBridgeAttr(Attr.getRange(), S.Context, Parm->Ident,
3844 Attr.getAttributeSpellingListIndex()));
3847 static void handleObjCBridgeMutableAttr(Sema &S, Scope *Sc, Decl *D,
3848 const AttributeList &Attr) {
3849 IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr;
3852 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
3856 D->addAttr(::new (S.Context)
3857 ObjCBridgeMutableAttr(Attr.getRange(), S.Context, Parm->Ident,
3858 Attr.getAttributeSpellingListIndex()));
3861 static void handleObjCBridgeRelatedAttr(Sema &S, Scope *Sc, Decl *D,
3862 const AttributeList &Attr) {
3863 IdentifierInfo *RelatedClass =
3864 Attr.isArgIdent(0) ? Attr.getArgAsIdent(0)->Ident : nullptr;
3865 if (!RelatedClass) {
3866 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
3869 IdentifierInfo *ClassMethod =
3870 Attr.getArgAsIdent(1) ? Attr.getArgAsIdent(1)->Ident : nullptr;
3871 IdentifierInfo *InstanceMethod =
3872 Attr.getArgAsIdent(2) ? Attr.getArgAsIdent(2)->Ident : nullptr;
3873 D->addAttr(::new (S.Context)
3874 ObjCBridgeRelatedAttr(Attr.getRange(), S.Context, RelatedClass,
3875 ClassMethod, InstanceMethod,
3876 Attr.getAttributeSpellingListIndex()));
3879 static void handleObjCDesignatedInitializer(Sema &S, Decl *D,
3880 const AttributeList &Attr) {
3881 ObjCInterfaceDecl *IFace;
3882 if (ObjCCategoryDecl *CatDecl =
3883 dyn_cast<ObjCCategoryDecl>(D->getDeclContext()))
3884 IFace = CatDecl->getClassInterface();
3886 IFace = cast<ObjCInterfaceDecl>(D->getDeclContext());
3891 IFace->setHasDesignatedInitializers();
3892 D->addAttr(::new (S.Context)
3893 ObjCDesignatedInitializerAttr(Attr.getRange(), S.Context,
3894 Attr.getAttributeSpellingListIndex()));
3897 static void handleObjCRuntimeName(Sema &S, Decl *D,
3898 const AttributeList &Attr) {
3899 StringRef MetaDataName;
3900 if (!S.checkStringLiteralArgumentAttr(Attr, 0, MetaDataName))
3902 D->addAttr(::new (S.Context)
3903 ObjCRuntimeNameAttr(Attr.getRange(), S.Context,
3905 Attr.getAttributeSpellingListIndex()));
3908 static void handleObjCOwnershipAttr(Sema &S, Decl *D,
3909 const AttributeList &Attr) {
3910 if (hasDeclarator(D)) return;
3912 S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type)
3913 << Attr.getRange() << Attr.getName() << ExpectedVariable;
3916 static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D,
3917 const AttributeList &Attr) {
3918 ValueDecl *vd = cast<ValueDecl>(D);
3919 QualType type = vd->getType();
3921 if (!type->isDependentType() &&
3922 !type->isObjCLifetimeType()) {
3923 S.Diag(Attr.getLoc(), diag::err_objc_precise_lifetime_bad_type)
3928 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
3930 // If we have no lifetime yet, check the lifetime we're presumably
3932 if (lifetime == Qualifiers::OCL_None && !type->isDependentType())
3933 lifetime = type->getObjCARCImplicitLifetime();
3936 case Qualifiers::OCL_None:
3937 assert(type->isDependentType() &&
3938 "didn't infer lifetime for non-dependent type?");
3941 case Qualifiers::OCL_Weak: // meaningful
3942 case Qualifiers::OCL_Strong: // meaningful
3945 case Qualifiers::OCL_ExplicitNone:
3946 case Qualifiers::OCL_Autoreleasing:
3947 S.Diag(Attr.getLoc(), diag::warn_objc_precise_lifetime_meaningless)
3948 << (lifetime == Qualifiers::OCL_Autoreleasing);
3952 D->addAttr(::new (S.Context)
3953 ObjCPreciseLifetimeAttr(Attr.getRange(), S.Context,
3954 Attr.getAttributeSpellingListIndex()));
3957 //===----------------------------------------------------------------------===//
3958 // Microsoft specific attribute handlers.
3959 //===----------------------------------------------------------------------===//
3961 static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3962 if (!S.LangOpts.CPlusPlus) {
3963 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
3964 << Attr.getName() << AttributeLangSupport::C;
3968 if (!isa<CXXRecordDecl>(D)) {
3969 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
3970 << Attr.getName() << ExpectedClass;
3975 SourceLocation LiteralLoc;
3976 if (!S.checkStringLiteralArgumentAttr(Attr, 0, StrRef, &LiteralLoc))
3979 // GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or
3980 // "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}", normalize to the former.
3981 if (StrRef.size() == 38 && StrRef.front() == '{' && StrRef.back() == '}')
3982 StrRef = StrRef.drop_front().drop_back();
3984 // Validate GUID length.
3985 if (StrRef.size() != 36) {
3986 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
3990 for (unsigned i = 0; i < 36; ++i) {
3991 if (i == 8 || i == 13 || i == 18 || i == 23) {
3992 if (StrRef[i] != '-') {
3993 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
3996 } else if (!isHexDigit(StrRef[i])) {
3997 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
4002 D->addAttr(::new (S.Context) UuidAttr(Attr.getRange(), S.Context, StrRef,
4003 Attr.getAttributeSpellingListIndex()));
4006 static void handleMSInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4007 if (!S.LangOpts.CPlusPlus) {
4008 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
4009 << Attr.getName() << AttributeLangSupport::C;
4012 MSInheritanceAttr *IA = S.mergeMSInheritanceAttr(
4013 D, Attr.getRange(), /*BestCase=*/true,
4014 Attr.getAttributeSpellingListIndex(),
4015 (MSInheritanceAttr::Spelling)Attr.getSemanticSpelling());
4020 static void handleDeclspecThreadAttr(Sema &S, Decl *D,
4021 const AttributeList &Attr) {
4022 VarDecl *VD = cast<VarDecl>(D);
4023 if (!S.Context.getTargetInfo().isTLSSupported()) {
4024 S.Diag(Attr.getLoc(), diag::err_thread_unsupported);
4027 if (VD->getTSCSpec() != TSCS_unspecified) {
4028 S.Diag(Attr.getLoc(), diag::err_declspec_thread_on_thread_variable);
4031 if (VD->hasLocalStorage()) {
4032 S.Diag(Attr.getLoc(), diag::err_thread_non_global) << "__declspec(thread)";
4035 VD->addAttr(::new (S.Context) ThreadAttr(
4036 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4039 static void handleARMInterruptAttr(Sema &S, Decl *D,
4040 const AttributeList &Attr) {
4041 // Check the attribute arguments.
4042 if (Attr.getNumArgs() > 1) {
4043 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
4044 << Attr.getName() << 1;
4049 SourceLocation ArgLoc;
4051 if (Attr.getNumArgs() == 0)
4053 else if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &ArgLoc))
4056 ARMInterruptAttr::InterruptType Kind;
4057 if (!ARMInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
4058 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
4059 << Attr.getName() << Str << ArgLoc;
4063 unsigned Index = Attr.getAttributeSpellingListIndex();
4064 D->addAttr(::new (S.Context)
4065 ARMInterruptAttr(Attr.getLoc(), S.Context, Kind, Index));
4068 static void handleMSP430InterruptAttr(Sema &S, Decl *D,
4069 const AttributeList &Attr) {
4070 if (!checkAttributeNumArgs(S, Attr, 1))
4073 if (!Attr.isArgExpr(0)) {
4074 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName()
4075 << AANT_ArgumentIntegerConstant;
4079 // FIXME: Check for decl - it should be void ()(void).
4081 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
4082 llvm::APSInt NumParams(32);
4083 if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) {
4084 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
4085 << Attr.getName() << AANT_ArgumentIntegerConstant
4086 << NumParamsExpr->getSourceRange();
4090 unsigned Num = NumParams.getLimitedValue(255);
4091 if ((Num & 1) || Num > 30) {
4092 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
4093 << Attr.getName() << (int)NumParams.getSExtValue()
4094 << NumParamsExpr->getSourceRange();
4098 D->addAttr(::new (S.Context)
4099 MSP430InterruptAttr(Attr.getLoc(), S.Context, Num,
4100 Attr.getAttributeSpellingListIndex()));
4101 D->addAttr(UsedAttr::CreateImplicit(S.Context));
4104 static void handleInterruptAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4105 // Dispatch the interrupt attribute based on the current target.
4106 if (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::msp430)
4107 handleMSP430InterruptAttr(S, D, Attr);
4109 handleARMInterruptAttr(S, D, Attr);
4112 static void handleAMDGPUNumVGPRAttr(Sema &S, Decl *D,
4113 const AttributeList &Attr) {
4115 Expr *NumRegsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
4116 if (!checkUInt32Argument(S, Attr, NumRegsExpr, NumRegs))
4119 D->addAttr(::new (S.Context)
4120 AMDGPUNumVGPRAttr(Attr.getLoc(), S.Context,
4122 Attr.getAttributeSpellingListIndex()));
4125 static void handleAMDGPUNumSGPRAttr(Sema &S, Decl *D,
4126 const AttributeList &Attr) {
4128 Expr *NumRegsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
4129 if (!checkUInt32Argument(S, Attr, NumRegsExpr, NumRegs))
4132 D->addAttr(::new (S.Context)
4133 AMDGPUNumSGPRAttr(Attr.getLoc(), S.Context,
4135 Attr.getAttributeSpellingListIndex()));
4138 static void handleX86ForceAlignArgPointerAttr(Sema &S, Decl *D,
4139 const AttributeList& Attr) {
4140 // If we try to apply it to a function pointer, don't warn, but don't
4141 // do anything, either. It doesn't matter anyway, because there's nothing
4142 // special about calling a force_align_arg_pointer function.
4143 ValueDecl *VD = dyn_cast<ValueDecl>(D);
4144 if (VD && VD->getType()->isFunctionPointerType())
4146 // Also don't warn on function pointer typedefs.
4147 TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
4148 if (TD && (TD->getUnderlyingType()->isFunctionPointerType() ||
4149 TD->getUnderlyingType()->isFunctionType()))
4151 // Attribute can only be applied to function types.
4152 if (!isa<FunctionDecl>(D)) {
4153 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
4154 << Attr.getName() << /* function */0;
4158 D->addAttr(::new (S.Context)
4159 X86ForceAlignArgPointerAttr(Attr.getRange(), S.Context,
4160 Attr.getAttributeSpellingListIndex()));
4163 DLLImportAttr *Sema::mergeDLLImportAttr(Decl *D, SourceRange Range,
4164 unsigned AttrSpellingListIndex) {
4165 if (D->hasAttr<DLLExportAttr>()) {
4166 Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'dllimport'";
4170 if (D->hasAttr<DLLImportAttr>())
4173 return ::new (Context) DLLImportAttr(Range, Context, AttrSpellingListIndex);
4176 DLLExportAttr *Sema::mergeDLLExportAttr(Decl *D, SourceRange Range,
4177 unsigned AttrSpellingListIndex) {
4178 if (DLLImportAttr *Import = D->getAttr<DLLImportAttr>()) {
4179 Diag(Import->getLocation(), diag::warn_attribute_ignored) << Import;
4180 D->dropAttr<DLLImportAttr>();
4183 if (D->hasAttr<DLLExportAttr>())
4186 return ::new (Context) DLLExportAttr(Range, Context, AttrSpellingListIndex);
4189 static void handleDLLAttr(Sema &S, Decl *D, const AttributeList &A) {
4190 if (isa<ClassTemplatePartialSpecializationDecl>(D) &&
4191 S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
4192 S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored)
4197 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
4198 if (FD->isInlined() && A.getKind() == AttributeList::AT_DLLImport &&
4199 !S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
4200 // MinGW doesn't allow dllimport on inline functions.
4201 S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored_on_inline)
4207 unsigned Index = A.getAttributeSpellingListIndex();
4208 Attr *NewAttr = A.getKind() == AttributeList::AT_DLLExport
4209 ? (Attr *)S.mergeDLLExportAttr(D, A.getRange(), Index)
4210 : (Attr *)S.mergeDLLImportAttr(D, A.getRange(), Index);
4212 D->addAttr(NewAttr);
4216 Sema::mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
4217 unsigned AttrSpellingListIndex,
4218 MSInheritanceAttr::Spelling SemanticSpelling) {
4219 if (MSInheritanceAttr *IA = D->getAttr<MSInheritanceAttr>()) {
4220 if (IA->getSemanticSpelling() == SemanticSpelling)
4222 Diag(IA->getLocation(), diag::err_mismatched_ms_inheritance)
4223 << 1 /*previous declaration*/;
4224 Diag(Range.getBegin(), diag::note_previous_ms_inheritance);
4225 D->dropAttr<MSInheritanceAttr>();
4228 CXXRecordDecl *RD = cast<CXXRecordDecl>(D);
4229 if (RD->hasDefinition()) {
4230 if (checkMSInheritanceAttrOnDefinition(RD, Range, BestCase,
4231 SemanticSpelling)) {
4235 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) {
4236 Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
4237 << 1 /*partial specialization*/;
4240 if (RD->getDescribedClassTemplate()) {
4241 Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
4242 << 0 /*primary template*/;
4247 return ::new (Context)
4248 MSInheritanceAttr(Range, Context, BestCase, AttrSpellingListIndex);
4251 static void handleCapabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4252 // The capability attributes take a single string parameter for the name of
4253 // the capability they represent. The lockable attribute does not take any
4254 // parameters. However, semantically, both attributes represent the same
4255 // concept, and so they use the same semantic attribute. Eventually, the
4256 // lockable attribute will be removed.
4258 // For backward compatibility, any capability which has no specified string
4259 // literal will be considered a "mutex."
4260 StringRef N("mutex");
4261 SourceLocation LiteralLoc;
4262 if (Attr.getKind() == AttributeList::AT_Capability &&
4263 !S.checkStringLiteralArgumentAttr(Attr, 0, N, &LiteralLoc))
4266 // Currently, there are only two names allowed for a capability: role and
4267 // mutex (case insensitive). Diagnose other capability names.
4268 if (!N.equals_lower("mutex") && !N.equals_lower("role"))
4269 S.Diag(LiteralLoc, diag::warn_invalid_capability_name) << N;
4271 D->addAttr(::new (S.Context) CapabilityAttr(Attr.getRange(), S.Context, N,
4272 Attr.getAttributeSpellingListIndex()));
4275 static void handleAssertCapabilityAttr(Sema &S, Decl *D,
4276 const AttributeList &Attr) {
4277 D->addAttr(::new (S.Context) AssertCapabilityAttr(Attr.getRange(), S.Context,
4278 Attr.getArgAsExpr(0),
4279 Attr.getAttributeSpellingListIndex()));
4282 static void handleAcquireCapabilityAttr(Sema &S, Decl *D,
4283 const AttributeList &Attr) {
4284 SmallVector<Expr*, 1> Args;
4285 if (!checkLockFunAttrCommon(S, D, Attr, Args))
4288 D->addAttr(::new (S.Context) AcquireCapabilityAttr(Attr.getRange(),
4290 Args.data(), Args.size(),
4291 Attr.getAttributeSpellingListIndex()));
4294 static void handleTryAcquireCapabilityAttr(Sema &S, Decl *D,
4295 const AttributeList &Attr) {
4296 SmallVector<Expr*, 2> Args;
4297 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
4300 D->addAttr(::new (S.Context) TryAcquireCapabilityAttr(Attr.getRange(),
4302 Attr.getArgAsExpr(0),
4305 Attr.getAttributeSpellingListIndex()));
4308 static void handleReleaseCapabilityAttr(Sema &S, Decl *D,
4309 const AttributeList &Attr) {
4310 // Check that all arguments are lockable objects.
4311 SmallVector<Expr *, 1> Args;
4312 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, true);
4314 D->addAttr(::new (S.Context) ReleaseCapabilityAttr(
4315 Attr.getRange(), S.Context, Args.data(), Args.size(),
4316 Attr.getAttributeSpellingListIndex()));
4319 static void handleRequiresCapabilityAttr(Sema &S, Decl *D,
4320 const AttributeList &Attr) {
4321 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
4324 // check that all arguments are lockable objects
4325 SmallVector<Expr*, 1> Args;
4326 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
4330 RequiresCapabilityAttr *RCA = ::new (S.Context)
4331 RequiresCapabilityAttr(Attr.getRange(), S.Context, Args.data(),
4332 Args.size(), Attr.getAttributeSpellingListIndex());
4337 static void handleDeprecatedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4338 if (auto *NSD = dyn_cast<NamespaceDecl>(D)) {
4339 if (NSD->isAnonymousNamespace()) {
4340 S.Diag(Attr.getLoc(), diag::warn_deprecated_anonymous_namespace);
4341 // Do not want to attach the attribute to the namespace because that will
4342 // cause confusing diagnostic reports for uses of declarations within the
4348 if (!S.getLangOpts().CPlusPlus14)
4349 if (Attr.isCXX11Attribute() &&
4350 !(Attr.hasScope() && Attr.getScopeName()->isStr("gnu")))
4351 S.Diag(Attr.getLoc(), diag::ext_deprecated_attr_is_a_cxx14_extension);
4353 handleAttrWithMessage<DeprecatedAttr>(S, D, Attr);
4356 static void handleNoSanitizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
4357 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
4360 std::vector<std::string> Sanitizers;
4362 for (unsigned I = 0, E = Attr.getNumArgs(); I != E; ++I) {
4363 StringRef SanitizerName;
4364 SourceLocation LiteralLoc;
4366 if (!S.checkStringLiteralArgumentAttr(Attr, I, SanitizerName, &LiteralLoc))
4369 if (parseSanitizerValue(SanitizerName, /*AllowGroups=*/true) == 0)
4370 S.Diag(LiteralLoc, diag::warn_unknown_sanitizer_ignored) << SanitizerName;
4372 Sanitizers.push_back(SanitizerName);
4375 D->addAttr(::new (S.Context) NoSanitizeAttr(
4376 Attr.getRange(), S.Context, Sanitizers.data(), Sanitizers.size(),
4377 Attr.getAttributeSpellingListIndex()));
4380 static void handleNoSanitizeSpecificAttr(Sema &S, Decl *D,
4381 const AttributeList &Attr) {
4382 std::string SanitizerName =
4383 llvm::StringSwitch<std::string>(Attr.getName()->getName())
4384 .Case("no_address_safety_analysis", "address")
4385 .Case("no_sanitize_address", "address")
4386 .Case("no_sanitize_thread", "thread")
4387 .Case("no_sanitize_memory", "memory");
4388 D->addAttr(::new (S.Context)
4389 NoSanitizeAttr(Attr.getRange(), S.Context, &SanitizerName, 1,
4390 Attr.getAttributeSpellingListIndex()));
4393 /// Handles semantic checking for features that are common to all attributes,
4394 /// such as checking whether a parameter was properly specified, or the correct
4395 /// number of arguments were passed, etc.
4396 static bool handleCommonAttributeFeatures(Sema &S, Scope *scope, Decl *D,
4397 const AttributeList &Attr) {
4398 // Several attributes carry different semantics than the parsing requires, so
4399 // those are opted out of the common handling.
4401 // We also bail on unknown and ignored attributes because those are handled
4402 // as part of the target-specific handling logic.
4403 if (Attr.hasCustomParsing() ||
4404 Attr.getKind() == AttributeList::UnknownAttribute)
4407 // Check whether the attribute requires specific language extensions to be
4409 if (!Attr.diagnoseLangOpts(S))
4412 if (Attr.getMinArgs() == Attr.getMaxArgs()) {
4413 // If there are no optional arguments, then checking for the argument count
4415 if (!checkAttributeNumArgs(S, Attr, Attr.getMinArgs()))
4418 // There are optional arguments, so checking is slightly more involved.
4419 if (Attr.getMinArgs() &&
4420 !checkAttributeAtLeastNumArgs(S, Attr, Attr.getMinArgs()))
4422 else if (!Attr.hasVariadicArg() && Attr.getMaxArgs() &&
4423 !checkAttributeAtMostNumArgs(S, Attr, Attr.getMaxArgs()))
4427 // Check whether the attribute appertains to the given subject.
4428 if (!Attr.diagnoseAppertainsTo(S, D))
4434 //===----------------------------------------------------------------------===//
4435 // Top Level Sema Entry Points
4436 //===----------------------------------------------------------------------===//
4438 /// ProcessDeclAttribute - Apply the specific attribute to the specified decl if
4439 /// the attribute applies to decls. If the attribute is a type attribute, just
4440 /// silently ignore it if a GNU attribute.
4441 static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
4442 const AttributeList &Attr,
4443 bool IncludeCXX11Attributes) {
4444 if (Attr.isInvalid() || Attr.getKind() == AttributeList::IgnoredAttribute)
4447 // Ignore C++11 attributes on declarator chunks: they appertain to the type
4449 if (Attr.isCXX11Attribute() && !IncludeCXX11Attributes)
4452 // Unknown attributes are automatically warned on. Target-specific attributes
4453 // which do not apply to the current target architecture are treated as
4454 // though they were unknown attributes.
4455 if (Attr.getKind() == AttributeList::UnknownAttribute ||
4456 !Attr.existsInTarget(S.Context.getTargetInfo().getTriple())) {
4457 S.Diag(Attr.getLoc(), Attr.isDeclspecAttribute()
4458 ? diag::warn_unhandled_ms_attribute_ignored
4459 : diag::warn_unknown_attribute_ignored)
4464 if (handleCommonAttributeFeatures(S, scope, D, Attr))
4467 switch (Attr.getKind()) {
4469 // Type attributes are handled elsewhere; silently move on.
4470 assert(Attr.isTypeAttr() && "Non-type attribute not handled");
4472 case AttributeList::AT_Interrupt:
4473 handleInterruptAttr(S, D, Attr);
4475 case AttributeList::AT_X86ForceAlignArgPointer:
4476 handleX86ForceAlignArgPointerAttr(S, D, Attr);
4478 case AttributeList::AT_DLLExport:
4479 case AttributeList::AT_DLLImport:
4480 handleDLLAttr(S, D, Attr);
4482 case AttributeList::AT_Mips16:
4483 handleSimpleAttribute<Mips16Attr>(S, D, Attr);
4485 case AttributeList::AT_NoMips16:
4486 handleSimpleAttribute<NoMips16Attr>(S, D, Attr);
4488 case AttributeList::AT_AMDGPUNumVGPR:
4489 handleAMDGPUNumVGPRAttr(S, D, Attr);
4491 case AttributeList::AT_AMDGPUNumSGPR:
4492 handleAMDGPUNumSGPRAttr(S, D, Attr);
4494 case AttributeList::AT_IBAction:
4495 handleSimpleAttribute<IBActionAttr>(S, D, Attr);
4497 case AttributeList::AT_IBOutlet:
4498 handleIBOutlet(S, D, Attr);
4500 case AttributeList::AT_IBOutletCollection:
4501 handleIBOutletCollection(S, D, Attr);
4503 case AttributeList::AT_Alias:
4504 handleAliasAttr(S, D, Attr);
4506 case AttributeList::AT_Aligned:
4507 handleAlignedAttr(S, D, Attr);
4509 case AttributeList::AT_AlignValue:
4510 handleAlignValueAttr(S, D, Attr);
4512 case AttributeList::AT_AlwaysInline:
4513 handleAlwaysInlineAttr(S, D, Attr);
4515 case AttributeList::AT_AnalyzerNoReturn:
4516 handleAnalyzerNoReturnAttr(S, D, Attr);
4518 case AttributeList::AT_TLSModel:
4519 handleTLSModelAttr(S, D, Attr);
4521 case AttributeList::AT_Annotate:
4522 handleAnnotateAttr(S, D, Attr);
4524 case AttributeList::AT_Availability:
4525 handleAvailabilityAttr(S, D, Attr);
4527 case AttributeList::AT_CarriesDependency:
4528 handleDependencyAttr(S, scope, D, Attr);
4530 case AttributeList::AT_Common:
4531 handleCommonAttr(S, D, Attr);
4533 case AttributeList::AT_CUDAConstant:
4534 handleSimpleAttribute<CUDAConstantAttr>(S, D, Attr);
4536 case AttributeList::AT_Constructor:
4537 handleConstructorAttr(S, D, Attr);
4539 case AttributeList::AT_CXX11NoReturn:
4540 handleSimpleAttribute<CXX11NoReturnAttr>(S, D, Attr);
4542 case AttributeList::AT_Deprecated:
4543 handleDeprecatedAttr(S, D, Attr);
4545 case AttributeList::AT_Destructor:
4546 handleDestructorAttr(S, D, Attr);
4548 case AttributeList::AT_EnableIf:
4549 handleEnableIfAttr(S, D, Attr);
4551 case AttributeList::AT_ExtVectorType:
4552 handleExtVectorTypeAttr(S, scope, D, Attr);
4554 case AttributeList::AT_MinSize:
4555 handleMinSizeAttr(S, D, Attr);
4557 case AttributeList::AT_OptimizeNone:
4558 handleOptimizeNoneAttr(S, D, Attr);
4560 case AttributeList::AT_FlagEnum:
4561 handleSimpleAttribute<FlagEnumAttr>(S, D, Attr);
4563 case AttributeList::AT_Flatten:
4564 handleSimpleAttribute<FlattenAttr>(S, D, Attr);
4566 case AttributeList::AT_Format:
4567 handleFormatAttr(S, D, Attr);
4569 case AttributeList::AT_FormatArg:
4570 handleFormatArgAttr(S, D, Attr);
4572 case AttributeList::AT_CUDAGlobal:
4573 handleGlobalAttr(S, D, Attr);
4575 case AttributeList::AT_CUDADevice:
4576 handleSimpleAttribute<CUDADeviceAttr>(S, D, Attr);
4578 case AttributeList::AT_CUDAHost:
4579 handleSimpleAttribute<CUDAHostAttr>(S, D, Attr);
4581 case AttributeList::AT_GNUInline:
4582 handleGNUInlineAttr(S, D, Attr);
4584 case AttributeList::AT_CUDALaunchBounds:
4585 handleLaunchBoundsAttr(S, D, Attr);
4587 case AttributeList::AT_Restrict:
4588 handleRestrictAttr(S, D, Attr);
4590 case AttributeList::AT_MayAlias:
4591 handleSimpleAttribute<MayAliasAttr>(S, D, Attr);
4593 case AttributeList::AT_Mode:
4594 handleModeAttr(S, D, Attr);
4596 case AttributeList::AT_NoCommon:
4597 handleSimpleAttribute<NoCommonAttr>(S, D, Attr);
4599 case AttributeList::AT_NoSplitStack:
4600 handleSimpleAttribute<NoSplitStackAttr>(S, D, Attr);
4602 case AttributeList::AT_NonNull:
4603 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(D))
4604 handleNonNullAttrParameter(S, PVD, Attr);
4606 handleNonNullAttr(S, D, Attr);
4608 case AttributeList::AT_ReturnsNonNull:
4609 handleReturnsNonNullAttr(S, D, Attr);
4611 case AttributeList::AT_AssumeAligned:
4612 handleAssumeAlignedAttr(S, D, Attr);
4614 case AttributeList::AT_Overloadable:
4615 handleSimpleAttribute<OverloadableAttr>(S, D, Attr);
4617 case AttributeList::AT_Ownership:
4618 handleOwnershipAttr(S, D, Attr);
4620 case AttributeList::AT_Cold:
4621 handleColdAttr(S, D, Attr);
4623 case AttributeList::AT_Hot:
4624 handleHotAttr(S, D, Attr);
4626 case AttributeList::AT_Naked:
4627 handleSimpleAttribute<NakedAttr>(S, D, Attr);
4629 case AttributeList::AT_NoReturn:
4630 handleNoReturnAttr(S, D, Attr);
4632 case AttributeList::AT_NoThrow:
4633 handleSimpleAttribute<NoThrowAttr>(S, D, Attr);
4635 case AttributeList::AT_CUDAShared:
4636 handleSimpleAttribute<CUDASharedAttr>(S, D, Attr);
4638 case AttributeList::AT_VecReturn:
4639 handleVecReturnAttr(S, D, Attr);
4642 case AttributeList::AT_ObjCOwnership:
4643 handleObjCOwnershipAttr(S, D, Attr);
4645 case AttributeList::AT_ObjCPreciseLifetime:
4646 handleObjCPreciseLifetimeAttr(S, D, Attr);
4649 case AttributeList::AT_ObjCReturnsInnerPointer:
4650 handleObjCReturnsInnerPointerAttr(S, D, Attr);
4653 case AttributeList::AT_ObjCRequiresSuper:
4654 handleObjCRequiresSuperAttr(S, D, Attr);
4657 case AttributeList::AT_ObjCBridge:
4658 handleObjCBridgeAttr(S, scope, D, Attr);
4661 case AttributeList::AT_ObjCBridgeMutable:
4662 handleObjCBridgeMutableAttr(S, scope, D, Attr);
4665 case AttributeList::AT_ObjCBridgeRelated:
4666 handleObjCBridgeRelatedAttr(S, scope, D, Attr);
4669 case AttributeList::AT_ObjCDesignatedInitializer:
4670 handleObjCDesignatedInitializer(S, D, Attr);
4673 case AttributeList::AT_ObjCRuntimeName:
4674 handleObjCRuntimeName(S, D, Attr);
4677 case AttributeList::AT_CFAuditedTransfer:
4678 handleCFAuditedTransferAttr(S, D, Attr);
4680 case AttributeList::AT_CFUnknownTransfer:
4681 handleCFUnknownTransferAttr(S, D, Attr);
4684 case AttributeList::AT_CFConsumed:
4685 case AttributeList::AT_NSConsumed:
4686 handleNSConsumedAttr(S, D, Attr);
4688 case AttributeList::AT_NSConsumesSelf:
4689 handleSimpleAttribute<NSConsumesSelfAttr>(S, D, Attr);
4692 case AttributeList::AT_NSReturnsAutoreleased:
4693 case AttributeList::AT_NSReturnsNotRetained:
4694 case AttributeList::AT_CFReturnsNotRetained:
4695 case AttributeList::AT_NSReturnsRetained:
4696 case AttributeList::AT_CFReturnsRetained:
4697 handleNSReturnsRetainedAttr(S, D, Attr);
4699 case AttributeList::AT_WorkGroupSizeHint:
4700 handleWorkGroupSize<WorkGroupSizeHintAttr>(S, D, Attr);
4702 case AttributeList::AT_ReqdWorkGroupSize:
4703 handleWorkGroupSize<ReqdWorkGroupSizeAttr>(S, D, Attr);
4705 case AttributeList::AT_VecTypeHint:
4706 handleVecTypeHint(S, D, Attr);
4709 case AttributeList::AT_InitPriority:
4710 handleInitPriorityAttr(S, D, Attr);
4713 case AttributeList::AT_Packed:
4714 handlePackedAttr(S, D, Attr);
4716 case AttributeList::AT_Section:
4717 handleSectionAttr(S, D, Attr);
4719 case AttributeList::AT_Unavailable:
4720 handleAttrWithMessage<UnavailableAttr>(S, D, Attr);
4722 case AttributeList::AT_ArcWeakrefUnavailable:
4723 handleSimpleAttribute<ArcWeakrefUnavailableAttr>(S, D, Attr);
4725 case AttributeList::AT_ObjCRootClass:
4726 handleSimpleAttribute<ObjCRootClassAttr>(S, D, Attr);
4728 case AttributeList::AT_ObjCExplicitProtocolImpl:
4729 handleObjCSuppresProtocolAttr(S, D, Attr);
4731 case AttributeList::AT_ObjCRequiresPropertyDefs:
4732 handleSimpleAttribute<ObjCRequiresPropertyDefsAttr>(S, D, Attr);
4734 case AttributeList::AT_Unused:
4735 handleSimpleAttribute<UnusedAttr>(S, D, Attr);
4737 case AttributeList::AT_ReturnsTwice:
4738 handleSimpleAttribute<ReturnsTwiceAttr>(S, D, Attr);
4740 case AttributeList::AT_Used:
4741 handleUsedAttr(S, D, Attr);
4743 case AttributeList::AT_Visibility:
4744 handleVisibilityAttr(S, D, Attr, false);
4746 case AttributeList::AT_TypeVisibility:
4747 handleVisibilityAttr(S, D, Attr, true);
4749 case AttributeList::AT_WarnUnused:
4750 handleSimpleAttribute<WarnUnusedAttr>(S, D, Attr);
4752 case AttributeList::AT_WarnUnusedResult:
4753 handleWarnUnusedResult(S, D, Attr);
4755 case AttributeList::AT_Weak:
4756 handleSimpleAttribute<WeakAttr>(S, D, Attr);
4758 case AttributeList::AT_WeakRef:
4759 handleWeakRefAttr(S, D, Attr);
4761 case AttributeList::AT_WeakImport:
4762 handleWeakImportAttr(S, D, Attr);
4764 case AttributeList::AT_TransparentUnion:
4765 handleTransparentUnionAttr(S, D, Attr);
4767 case AttributeList::AT_ObjCException:
4768 handleSimpleAttribute<ObjCExceptionAttr>(S, D, Attr);
4770 case AttributeList::AT_ObjCMethodFamily:
4771 handleObjCMethodFamilyAttr(S, D, Attr);
4773 case AttributeList::AT_ObjCNSObject:
4774 handleObjCNSObject(S, D, Attr);
4776 case AttributeList::AT_ObjCIndependentClass:
4777 handleObjCIndependentClass(S, D, Attr);
4779 case AttributeList::AT_Blocks:
4780 handleBlocksAttr(S, D, Attr);
4782 case AttributeList::AT_Sentinel:
4783 handleSentinelAttr(S, D, Attr);
4785 case AttributeList::AT_Const:
4786 handleSimpleAttribute<ConstAttr>(S, D, Attr);
4788 case AttributeList::AT_Pure:
4789 handleSimpleAttribute<PureAttr>(S, D, Attr);
4791 case AttributeList::AT_Cleanup:
4792 handleCleanupAttr(S, D, Attr);
4794 case AttributeList::AT_NoDebug:
4795 handleNoDebugAttr(S, D, Attr);
4797 case AttributeList::AT_NoDuplicate:
4798 handleSimpleAttribute<NoDuplicateAttr>(S, D, Attr);
4800 case AttributeList::AT_NoInline:
4801 handleSimpleAttribute<NoInlineAttr>(S, D, Attr);
4803 case AttributeList::AT_NoInstrumentFunction: // Interacts with -pg.
4804 handleSimpleAttribute<NoInstrumentFunctionAttr>(S, D, Attr);
4806 case AttributeList::AT_StdCall:
4807 case AttributeList::AT_CDecl:
4808 case AttributeList::AT_FastCall:
4809 case AttributeList::AT_ThisCall:
4810 case AttributeList::AT_Pascal:
4811 case AttributeList::AT_VectorCall:
4812 case AttributeList::AT_MSABI:
4813 case AttributeList::AT_SysVABI:
4814 case AttributeList::AT_Pcs:
4815 case AttributeList::AT_IntelOclBicc:
4816 handleCallConvAttr(S, D, Attr);
4818 case AttributeList::AT_OpenCLKernel:
4819 handleSimpleAttribute<OpenCLKernelAttr>(S, D, Attr);
4821 case AttributeList::AT_OpenCLImageAccess:
4822 handleSimpleAttribute<OpenCLImageAccessAttr>(S, D, Attr);
4825 // Microsoft attributes:
4826 case AttributeList::AT_MSNoVTable:
4827 handleSimpleAttribute<MSNoVTableAttr>(S, D, Attr);
4829 case AttributeList::AT_MSStruct:
4830 handleSimpleAttribute<MSStructAttr>(S, D, Attr);
4832 case AttributeList::AT_Uuid:
4833 handleUuidAttr(S, D, Attr);
4835 case AttributeList::AT_MSInheritance:
4836 handleMSInheritanceAttr(S, D, Attr);
4838 case AttributeList::AT_SelectAny:
4839 handleSimpleAttribute<SelectAnyAttr>(S, D, Attr);
4841 case AttributeList::AT_Thread:
4842 handleDeclspecThreadAttr(S, D, Attr);
4845 // Thread safety attributes:
4846 case AttributeList::AT_AssertExclusiveLock:
4847 handleAssertExclusiveLockAttr(S, D, Attr);
4849 case AttributeList::AT_AssertSharedLock:
4850 handleAssertSharedLockAttr(S, D, Attr);
4852 case AttributeList::AT_GuardedVar:
4853 handleSimpleAttribute<GuardedVarAttr>(S, D, Attr);
4855 case AttributeList::AT_PtGuardedVar:
4856 handlePtGuardedVarAttr(S, D, Attr);
4858 case AttributeList::AT_ScopedLockable:
4859 handleSimpleAttribute<ScopedLockableAttr>(S, D, Attr);
4861 case AttributeList::AT_NoSanitize:
4862 handleNoSanitizeAttr(S, D, Attr);
4864 case AttributeList::AT_NoSanitizeSpecific:
4865 handleNoSanitizeSpecificAttr(S, D, Attr);
4867 case AttributeList::AT_NoThreadSafetyAnalysis:
4868 handleSimpleAttribute<NoThreadSafetyAnalysisAttr>(S, D, Attr);
4870 case AttributeList::AT_GuardedBy:
4871 handleGuardedByAttr(S, D, Attr);
4873 case AttributeList::AT_PtGuardedBy:
4874 handlePtGuardedByAttr(S, D, Attr);
4876 case AttributeList::AT_ExclusiveTrylockFunction:
4877 handleExclusiveTrylockFunctionAttr(S, D, Attr);
4879 case AttributeList::AT_LockReturned:
4880 handleLockReturnedAttr(S, D, Attr);
4882 case AttributeList::AT_LocksExcluded:
4883 handleLocksExcludedAttr(S, D, Attr);
4885 case AttributeList::AT_SharedTrylockFunction:
4886 handleSharedTrylockFunctionAttr(S, D, Attr);
4888 case AttributeList::AT_AcquiredBefore:
4889 handleAcquiredBeforeAttr(S, D, Attr);
4891 case AttributeList::AT_AcquiredAfter:
4892 handleAcquiredAfterAttr(S, D, Attr);
4895 // Capability analysis attributes.
4896 case AttributeList::AT_Capability:
4897 case AttributeList::AT_Lockable:
4898 handleCapabilityAttr(S, D, Attr);
4900 case AttributeList::AT_RequiresCapability:
4901 handleRequiresCapabilityAttr(S, D, Attr);
4904 case AttributeList::AT_AssertCapability:
4905 handleAssertCapabilityAttr(S, D, Attr);
4907 case AttributeList::AT_AcquireCapability:
4908 handleAcquireCapabilityAttr(S, D, Attr);
4910 case AttributeList::AT_ReleaseCapability:
4911 handleReleaseCapabilityAttr(S, D, Attr);
4913 case AttributeList::AT_TryAcquireCapability:
4914 handleTryAcquireCapabilityAttr(S, D, Attr);
4917 // Consumed analysis attributes.
4918 case AttributeList::AT_Consumable:
4919 handleConsumableAttr(S, D, Attr);
4921 case AttributeList::AT_ConsumableAutoCast:
4922 handleSimpleAttribute<ConsumableAutoCastAttr>(S, D, Attr);
4924 case AttributeList::AT_ConsumableSetOnRead:
4925 handleSimpleAttribute<ConsumableSetOnReadAttr>(S, D, Attr);
4927 case AttributeList::AT_CallableWhen:
4928 handleCallableWhenAttr(S, D, Attr);
4930 case AttributeList::AT_ParamTypestate:
4931 handleParamTypestateAttr(S, D, Attr);
4933 case AttributeList::AT_ReturnTypestate:
4934 handleReturnTypestateAttr(S, D, Attr);
4936 case AttributeList::AT_SetTypestate:
4937 handleSetTypestateAttr(S, D, Attr);
4939 case AttributeList::AT_TestTypestate:
4940 handleTestTypestateAttr(S, D, Attr);
4943 // Type safety attributes.
4944 case AttributeList::AT_ArgumentWithTypeTag:
4945 handleArgumentWithTypeTagAttr(S, D, Attr);
4947 case AttributeList::AT_TypeTagForDatatype:
4948 handleTypeTagForDatatypeAttr(S, D, Attr);
4953 /// ProcessDeclAttributeList - Apply all the decl attributes in the specified
4954 /// attribute list to the specified decl, ignoring any type attributes.
4955 void Sema::ProcessDeclAttributeList(Scope *S, Decl *D,
4956 const AttributeList *AttrList,
4957 bool IncludeCXX11Attributes) {
4958 for (const AttributeList* l = AttrList; l; l = l->getNext())
4959 ProcessDeclAttribute(*this, S, D, *l, IncludeCXX11Attributes);
4961 // FIXME: We should be able to handle these cases in TableGen.
4963 // static int a9 __attribute__((weakref));
4964 // but that looks really pointless. We reject it.
4965 if (D->hasAttr<WeakRefAttr>() && !D->hasAttr<AliasAttr>()) {
4966 Diag(AttrList->getLoc(), diag::err_attribute_weakref_without_alias)
4967 << cast<NamedDecl>(D);
4968 D->dropAttr<WeakRefAttr>();
4972 // FIXME: We should be able to handle this in TableGen as well. It would be
4973 // good to have a way to specify "these attributes must appear as a group",
4974 // for these. Additionally, it would be good to have a way to specify "these
4975 // attribute must never appear as a group" for attributes like cold and hot.
4976 if (!D->hasAttr<OpenCLKernelAttr>()) {
4977 // These attributes cannot be applied to a non-kernel function.
4978 if (Attr *A = D->getAttr<ReqdWorkGroupSizeAttr>()) {
4979 // FIXME: This emits a different error message than
4980 // diag::err_attribute_wrong_decl_type + ExpectedKernelFunction.
4981 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
4982 D->setInvalidDecl();
4983 } else if (Attr *A = D->getAttr<WorkGroupSizeHintAttr>()) {
4984 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
4985 D->setInvalidDecl();
4986 } else if (Attr *A = D->getAttr<VecTypeHintAttr>()) {
4987 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
4988 D->setInvalidDecl();
4989 } else if (Attr *A = D->getAttr<AMDGPUNumVGPRAttr>()) {
4990 Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
4991 << A << ExpectedKernelFunction;
4992 D->setInvalidDecl();
4993 } else if (Attr *A = D->getAttr<AMDGPUNumSGPRAttr>()) {
4994 Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
4995 << A << ExpectedKernelFunction;
4996 D->setInvalidDecl();
5001 // Annotation attributes are the only attributes allowed after an access
5003 bool Sema::ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
5004 const AttributeList *AttrList) {
5005 for (const AttributeList* l = AttrList; l; l = l->getNext()) {
5006 if (l->getKind() == AttributeList::AT_Annotate) {
5007 ProcessDeclAttribute(*this, nullptr, ASDecl, *l, l->isCXX11Attribute());
5009 Diag(l->getLoc(), diag::err_only_annotate_after_access_spec);
5017 /// checkUnusedDeclAttributes - Check a list of attributes to see if it
5018 /// contains any decl attributes that we should warn about.
5019 static void checkUnusedDeclAttributes(Sema &S, const AttributeList *A) {
5020 for ( ; A; A = A->getNext()) {
5021 // Only warn if the attribute is an unignored, non-type attribute.
5022 if (A->isUsedAsTypeAttr() || A->isInvalid()) continue;
5023 if (A->getKind() == AttributeList::IgnoredAttribute) continue;
5025 if (A->getKind() == AttributeList::UnknownAttribute) {
5026 S.Diag(A->getLoc(), diag::warn_unknown_attribute_ignored)
5027 << A->getName() << A->getRange();
5029 S.Diag(A->getLoc(), diag::warn_attribute_not_on_decl)
5030 << A->getName() << A->getRange();
5035 /// checkUnusedDeclAttributes - Given a declarator which is not being
5036 /// used to build a declaration, complain about any decl attributes
5037 /// which might be lying around on it.
5038 void Sema::checkUnusedDeclAttributes(Declarator &D) {
5039 ::checkUnusedDeclAttributes(*this, D.getDeclSpec().getAttributes().getList());
5040 ::checkUnusedDeclAttributes(*this, D.getAttributes());
5041 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i)
5042 ::checkUnusedDeclAttributes(*this, D.getTypeObject(i).getAttrs());
5045 /// DeclClonePragmaWeak - clone existing decl (maybe definition),
5046 /// \#pragma weak needs a non-definition decl and source may not have one.
5047 NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
5048 SourceLocation Loc) {
5049 assert(isa<FunctionDecl>(ND) || isa<VarDecl>(ND));
5050 NamedDecl *NewD = nullptr;
5051 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
5052 FunctionDecl *NewFD;
5053 // FIXME: Missing call to CheckFunctionDeclaration().
5055 // FIXME: Is the qualifier info correct?
5056 // FIXME: Is the DeclContext correct?
5057 NewFD = FunctionDecl::Create(FD->getASTContext(), FD->getDeclContext(),
5058 Loc, Loc, DeclarationName(II),
5059 FD->getType(), FD->getTypeSourceInfo(),
5060 SC_None, false/*isInlineSpecified*/,
5062 false/*isConstexprSpecified*/);
5065 if (FD->getQualifier())
5066 NewFD->setQualifierInfo(FD->getQualifierLoc());
5068 // Fake up parameter variables; they are declared as if this were
5070 QualType FDTy = FD->getType();
5071 if (const FunctionProtoType *FT = FDTy->getAs<FunctionProtoType>()) {
5072 SmallVector<ParmVarDecl*, 16> Params;
5073 for (const auto &AI : FT->param_types()) {
5074 ParmVarDecl *Param = BuildParmVarDeclForTypedef(NewFD, Loc, AI);
5075 Param->setScopeInfo(0, Params.size());
5076 Params.push_back(Param);
5078 NewFD->setParams(Params);
5080 } else if (VarDecl *VD = dyn_cast<VarDecl>(ND)) {
5081 NewD = VarDecl::Create(VD->getASTContext(), VD->getDeclContext(),
5082 VD->getInnerLocStart(), VD->getLocation(), II,
5083 VD->getType(), VD->getTypeSourceInfo(),
5084 VD->getStorageClass());
5085 if (VD->getQualifier()) {
5086 VarDecl *NewVD = cast<VarDecl>(NewD);
5087 NewVD->setQualifierInfo(VD->getQualifierLoc());
5093 /// DeclApplyPragmaWeak - A declaration (maybe definition) needs \#pragma weak
5094 /// applied to it, possibly with an alias.
5095 void Sema::DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W) {
5096 if (W.getUsed()) return; // only do this once
5098 if (W.getAlias()) { // clone decl, impersonate __attribute(weak,alias(...))
5099 IdentifierInfo *NDId = ND->getIdentifier();
5100 NamedDecl *NewD = DeclClonePragmaWeak(ND, W.getAlias(), W.getLocation());
5101 NewD->addAttr(AliasAttr::CreateImplicit(Context, NDId->getName(),
5103 NewD->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
5104 WeakTopLevelDecl.push_back(NewD);
5105 // FIXME: "hideous" code from Sema::LazilyCreateBuiltin
5106 // to insert Decl at TU scope, sorry.
5107 DeclContext *SavedContext = CurContext;
5108 CurContext = Context.getTranslationUnitDecl();
5109 NewD->setDeclContext(CurContext);
5110 NewD->setLexicalDeclContext(CurContext);
5111 PushOnScopeChains(NewD, S);
5112 CurContext = SavedContext;
5113 } else { // just add weak to existing
5114 ND->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
5118 void Sema::ProcessPragmaWeak(Scope *S, Decl *D) {
5119 // It's valid to "forward-declare" #pragma weak, in which case we
5121 LoadExternalWeakUndeclaredIdentifiers();
5122 if (!WeakUndeclaredIdentifiers.empty()) {
5123 NamedDecl *ND = nullptr;
5124 if (VarDecl *VD = dyn_cast<VarDecl>(D))
5125 if (VD->isExternC())
5127 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
5128 if (FD->isExternC())
5131 if (IdentifierInfo *Id = ND->getIdentifier()) {
5132 auto I = WeakUndeclaredIdentifiers.find(Id);
5133 if (I != WeakUndeclaredIdentifiers.end()) {
5134 WeakInfo W = I->second;
5135 DeclApplyPragmaWeak(S, ND, W);
5136 WeakUndeclaredIdentifiers[Id] = W;
5143 /// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in
5144 /// it, apply them to D. This is a bit tricky because PD can have attributes
5145 /// specified in many different places, and we need to find and apply them all.
5146 void Sema::ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD) {
5147 // Apply decl attributes from the DeclSpec if present.
5148 if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes().getList())
5149 ProcessDeclAttributeList(S, D, Attrs);
5151 // Walk the declarator structure, applying decl attributes that were in a type
5152 // position to the decl itself. This handles cases like:
5153 // int *__attr__(x)** D;
5154 // when X is a decl attribute.
5155 for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i)
5156 if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs())
5157 ProcessDeclAttributeList(S, D, Attrs, /*IncludeCXX11Attributes=*/false);
5159 // Finally, apply any attributes on the decl itself.
5160 if (const AttributeList *Attrs = PD.getAttributes())
5161 ProcessDeclAttributeList(S, D, Attrs);
5164 /// Is the given declaration allowed to use a forbidden type?
5165 static bool isForbiddenTypeAllowed(Sema &S, Decl *decl) {
5166 // Private ivars are always okay. Unfortunately, people don't
5167 // always properly make their ivars private, even in system headers.
5168 // Plus we need to make fields okay, too.
5169 // Function declarations in sys headers will be marked unavailable.
5170 if (!isa<FieldDecl>(decl) && !isa<ObjCPropertyDecl>(decl) &&
5171 !isa<FunctionDecl>(decl))
5174 // Require it to be declared in a system header.
5175 return S.Context.getSourceManager().isInSystemHeader(decl->getLocation());
5178 /// Handle a delayed forbidden-type diagnostic.
5179 static void handleDelayedForbiddenType(Sema &S, DelayedDiagnostic &diag,
5181 if (decl && isForbiddenTypeAllowed(S, decl)) {
5182 decl->addAttr(UnavailableAttr::CreateImplicit(S.Context,
5183 "this system declaration uses an unsupported type",
5187 if (S.getLangOpts().ObjCAutoRefCount)
5188 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(decl)) {
5189 // FIXME: we may want to suppress diagnostics for all
5190 // kind of forbidden type messages on unavailable functions.
5191 if (FD->hasAttr<UnavailableAttr>() &&
5192 diag.getForbiddenTypeDiagnostic() ==
5193 diag::err_arc_array_param_no_ownership) {
5194 diag.Triggered = true;
5199 S.Diag(diag.Loc, diag.getForbiddenTypeDiagnostic())
5200 << diag.getForbiddenTypeOperand() << diag.getForbiddenTypeArgument();
5201 diag.Triggered = true;
5205 static bool isDeclDeprecated(Decl *D) {
5207 if (D->isDeprecated())
5209 // A category implicitly has the availability of the interface.
5210 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D))
5211 if (const ObjCInterfaceDecl *Interface = CatD->getClassInterface())
5212 return Interface->isDeprecated();
5213 } while ((D = cast_or_null<Decl>(D->getDeclContext())));
5217 static bool isDeclUnavailable(Decl *D) {
5219 if (D->isUnavailable())
5221 // A category implicitly has the availability of the interface.
5222 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D))
5223 if (const ObjCInterfaceDecl *Interface = CatD->getClassInterface())
5224 return Interface->isUnavailable();
5225 } while ((D = cast_or_null<Decl>(D->getDeclContext())));
5229 static void DoEmitAvailabilityWarning(Sema &S, Sema::AvailabilityDiagnostic K,
5230 Decl *Ctx, const NamedDecl *D,
5231 StringRef Message, SourceLocation Loc,
5232 const ObjCInterfaceDecl *UnknownObjCClass,
5233 const ObjCPropertyDecl *ObjCProperty,
5234 bool ObjCPropertyAccess) {
5235 // Diagnostics for deprecated or unavailable.
5236 unsigned diag, diag_message, diag_fwdclass_message;
5238 // Matches 'diag::note_property_attribute' options.
5239 unsigned property_note_select;
5241 // Matches diag::note_availability_specified_here.
5242 unsigned available_here_select_kind;
5244 // Don't warn if our current context is deprecated or unavailable.
5246 case Sema::AD_Deprecation:
5247 if (isDeclDeprecated(Ctx) || isDeclUnavailable(Ctx))
5249 diag = !ObjCPropertyAccess ? diag::warn_deprecated
5250 : diag::warn_property_method_deprecated;
5251 diag_message = diag::warn_deprecated_message;
5252 diag_fwdclass_message = diag::warn_deprecated_fwdclass_message;
5253 property_note_select = /* deprecated */ 0;
5254 available_here_select_kind = /* deprecated */ 2;
5257 case Sema::AD_Unavailable:
5258 if (isDeclUnavailable(Ctx))
5260 diag = !ObjCPropertyAccess ? diag::err_unavailable
5261 : diag::err_property_method_unavailable;
5262 diag_message = diag::err_unavailable_message;
5263 diag_fwdclass_message = diag::warn_unavailable_fwdclass_message;
5264 property_note_select = /* unavailable */ 1;
5265 available_here_select_kind = /* unavailable */ 0;
5268 case Sema::AD_Partial:
5269 diag = diag::warn_partial_availability;
5270 diag_message = diag::warn_partial_message;
5271 diag_fwdclass_message = diag::warn_partial_fwdclass_message;
5272 property_note_select = /* partial */ 2;
5273 available_here_select_kind = /* partial */ 3;
5277 if (!Message.empty()) {
5278 S.Diag(Loc, diag_message) << D << Message;
5280 S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute)
5281 << ObjCProperty->getDeclName() << property_note_select;
5282 } else if (!UnknownObjCClass) {
5283 S.Diag(Loc, diag) << D;
5285 S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute)
5286 << ObjCProperty->getDeclName() << property_note_select;
5288 S.Diag(Loc, diag_fwdclass_message) << D;
5289 S.Diag(UnknownObjCClass->getLocation(), diag::note_forward_class);
5292 S.Diag(D->getLocation(), diag::note_availability_specified_here)
5293 << D << available_here_select_kind;
5294 if (K == Sema::AD_Partial)
5295 S.Diag(Loc, diag::note_partial_availability_silence) << D;
5298 static void handleDelayedAvailabilityCheck(Sema &S, DelayedDiagnostic &DD,
5300 assert(DD.Kind == DelayedDiagnostic::Deprecation ||
5301 DD.Kind == DelayedDiagnostic::Unavailable);
5302 Sema::AvailabilityDiagnostic AD = DD.Kind == DelayedDiagnostic::Deprecation
5303 ? Sema::AD_Deprecation
5304 : Sema::AD_Unavailable;
5305 DD.Triggered = true;
5306 DoEmitAvailabilityWarning(
5307 S, AD, Ctx, DD.getDeprecationDecl(), DD.getDeprecationMessage(), DD.Loc,
5308 DD.getUnknownObjCClass(), DD.getObjCProperty(), false);
5311 void Sema::PopParsingDeclaration(ParsingDeclState state, Decl *decl) {
5312 assert(DelayedDiagnostics.getCurrentPool());
5313 DelayedDiagnosticPool &poppedPool = *DelayedDiagnostics.getCurrentPool();
5314 DelayedDiagnostics.popWithoutEmitting(state);
5316 // When delaying diagnostics to run in the context of a parsed
5317 // declaration, we only want to actually emit anything if parsing
5321 // We emit all the active diagnostics in this pool or any of its
5322 // parents. In general, we'll get one pool for the decl spec
5323 // and a child pool for each declarator; in a decl group like:
5324 // deprecated_typedef foo, *bar, baz();
5325 // only the declarator pops will be passed decls. This is correct;
5326 // we really do need to consider delayed diagnostics from the decl spec
5327 // for each of the different declarations.
5328 const DelayedDiagnosticPool *pool = &poppedPool;
5330 for (DelayedDiagnosticPool::pool_iterator
5331 i = pool->pool_begin(), e = pool->pool_end(); i != e; ++i) {
5332 // This const_cast is a bit lame. Really, Triggered should be mutable.
5333 DelayedDiagnostic &diag = const_cast<DelayedDiagnostic&>(*i);
5337 switch (diag.Kind) {
5338 case DelayedDiagnostic::Deprecation:
5339 case DelayedDiagnostic::Unavailable:
5340 // Don't bother giving deprecation/unavailable diagnostics if
5341 // the decl is invalid.
5342 if (!decl->isInvalidDecl())
5343 handleDelayedAvailabilityCheck(*this, diag, decl);
5346 case DelayedDiagnostic::Access:
5347 HandleDelayedAccessCheck(diag, decl);
5350 case DelayedDiagnostic::ForbiddenType:
5351 handleDelayedForbiddenType(*this, diag, decl);
5355 } while ((pool = pool->getParent()));
5358 /// Given a set of delayed diagnostics, re-emit them as if they had
5359 /// been delayed in the current context instead of in the given pool.
5360 /// Essentially, this just moves them to the current pool.
5361 void Sema::redelayDiagnostics(DelayedDiagnosticPool &pool) {
5362 DelayedDiagnosticPool *curPool = DelayedDiagnostics.getCurrentPool();
5363 assert(curPool && "re-emitting in undelayed context not supported");
5364 curPool->steal(pool);
5367 void Sema::EmitAvailabilityWarning(AvailabilityDiagnostic AD,
5368 NamedDecl *D, StringRef Message,
5370 const ObjCInterfaceDecl *UnknownObjCClass,
5371 const ObjCPropertyDecl *ObjCProperty,
5372 bool ObjCPropertyAccess) {
5373 // Delay if we're currently parsing a declaration.
5374 if (DelayedDiagnostics.shouldDelayDiagnostics() && AD != AD_Partial) {
5375 DelayedDiagnostics.add(DelayedDiagnostic::makeAvailability(
5376 AD, Loc, D, UnknownObjCClass, ObjCProperty, Message,
5377 ObjCPropertyAccess));
5381 Decl *Ctx = cast<Decl>(getCurLexicalContext());
5382 DoEmitAvailabilityWarning(*this, AD, Ctx, D, Message, Loc, UnknownObjCClass,
5383 ObjCProperty, ObjCPropertyAccess);