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 using namespace clang;
35 namespace AttributeLangSupport {
43 //===----------------------------------------------------------------------===//
45 //===----------------------------------------------------------------------===//
47 /// isFunctionOrMethod - Return true if the given decl has function
48 /// type (function or function-typed variable) or an Objective-C
50 static bool isFunctionOrMethod(const Decl *D) {
51 return (D->getFunctionType() != nullptr) || isa<ObjCMethodDecl>(D);
54 /// Return true if the given decl has a declarator that should have
55 /// been processed by Sema::GetTypeForDeclarator.
56 static bool hasDeclarator(const Decl *D) {
57 // In some sense, TypedefDecl really *ought* to be a DeclaratorDecl.
58 return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) ||
59 isa<ObjCPropertyDecl>(D);
62 /// hasFunctionProto - Return true if the given decl has a argument
63 /// information. This decl should have already passed
64 /// isFunctionOrMethod or isFunctionOrMethodOrBlock.
65 static bool hasFunctionProto(const Decl *D) {
66 if (const FunctionType *FnTy = D->getFunctionType())
67 return isa<FunctionProtoType>(FnTy);
68 return isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D);
71 /// getFunctionOrMethodNumParams - Return number of function or method
72 /// parameters. It is an error to call this on a K&R function (use
73 /// hasFunctionProto first).
74 static unsigned getFunctionOrMethodNumParams(const Decl *D) {
75 if (const FunctionType *FnTy = D->getFunctionType())
76 return cast<FunctionProtoType>(FnTy)->getNumParams();
77 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
78 return BD->getNumParams();
79 return cast<ObjCMethodDecl>(D)->param_size();
82 static QualType getFunctionOrMethodParamType(const Decl *D, unsigned Idx) {
83 if (const FunctionType *FnTy = D->getFunctionType())
84 return cast<FunctionProtoType>(FnTy)->getParamType(Idx);
85 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
86 return BD->getParamDecl(Idx)->getType();
88 return cast<ObjCMethodDecl>(D)->parameters()[Idx]->getType();
91 static QualType getFunctionOrMethodResultType(const Decl *D) {
92 if (const FunctionType *FnTy = D->getFunctionType())
93 return cast<FunctionType>(FnTy)->getReturnType();
94 return cast<ObjCMethodDecl>(D)->getReturnType();
97 static bool isFunctionOrMethodVariadic(const Decl *D) {
98 if (const FunctionType *FnTy = D->getFunctionType()) {
99 const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy);
100 return proto->isVariadic();
101 } else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
102 return BD->isVariadic();
104 return cast<ObjCMethodDecl>(D)->isVariadic();
108 static bool isInstanceMethod(const Decl *D) {
109 if (const CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D))
110 return MethodDecl->isInstance();
114 static inline bool isNSStringType(QualType T, ASTContext &Ctx) {
115 const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>();
119 ObjCInterfaceDecl *Cls = PT->getObjectType()->getInterface();
123 IdentifierInfo* ClsName = Cls->getIdentifier();
125 // FIXME: Should we walk the chain of classes?
126 return ClsName == &Ctx.Idents.get("NSString") ||
127 ClsName == &Ctx.Idents.get("NSMutableString");
130 static inline bool isCFStringType(QualType T, ASTContext &Ctx) {
131 const PointerType *PT = T->getAs<PointerType>();
135 const RecordType *RT = PT->getPointeeType()->getAs<RecordType>();
139 const RecordDecl *RD = RT->getDecl();
140 if (RD->getTagKind() != TTK_Struct)
143 return RD->getIdentifier() == &Ctx.Idents.get("__CFString");
146 static unsigned getNumAttributeArgs(const AttributeList &Attr) {
147 // FIXME: Include the type in the argument list.
148 return Attr.getNumArgs() + Attr.hasParsedType();
151 /// \brief Check if the attribute has exactly as many args as Num. May
153 static bool checkAttributeNumArgs(Sema &S, const AttributeList &Attr,
155 if (getNumAttributeArgs(Attr) != Num) {
156 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
157 << Attr.getName() << Num;
164 /// \brief Check if the attribute has at least as many args as Num. May
166 static bool checkAttributeAtLeastNumArgs(Sema &S, const AttributeList &Attr,
168 if (getNumAttributeArgs(Attr) < Num) {
169 S.Diag(Attr.getLoc(), diag::err_attribute_too_few_arguments)
170 << Attr.getName() << Num;
177 /// \brief If Expr is a valid integer constant, get the value of the integer
178 /// expression and return success or failure. May output an error.
179 static bool checkUInt32Argument(Sema &S, const AttributeList &Attr,
180 const Expr *Expr, uint32_t &Val,
181 unsigned Idx = UINT_MAX) {
183 if (Expr->isTypeDependent() || Expr->isValueDependent() ||
184 !Expr->isIntegerConstantExpr(I, S.Context)) {
186 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
187 << Attr.getName() << Idx << AANT_ArgumentIntegerConstant
188 << Expr->getSourceRange();
190 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
191 << Attr.getName() << AANT_ArgumentIntegerConstant
192 << Expr->getSourceRange();
195 Val = (uint32_t)I.getZExtValue();
199 /// \brief Diagnose mutually exclusive attributes when present on a given
200 /// declaration. Returns true if diagnosed.
201 template <typename AttrTy>
202 static bool checkAttrMutualExclusion(Sema &S, Decl *D,
203 const AttributeList &Attr) {
204 if (AttrTy *A = D->getAttr<AttrTy>()) {
205 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
206 << Attr.getName() << A;
212 /// \brief Check if IdxExpr is a valid parameter index for a function or
213 /// instance method D. May output an error.
215 /// \returns true if IdxExpr is a valid index.
216 static bool checkFunctionOrMethodParameterIndex(Sema &S, const Decl *D,
217 const AttributeList &Attr,
221 assert(isFunctionOrMethod(D));
223 // In C++ the implicit 'this' function parameter also counts.
224 // Parameters are counted from one.
225 bool HP = hasFunctionProto(D);
226 bool HasImplicitThisParam = isInstanceMethod(D);
227 bool IV = HP && isFunctionOrMethodVariadic(D);
229 (HP ? getFunctionOrMethodNumParams(D) : 0) + HasImplicitThisParam;
232 if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() ||
233 !IdxExpr->isIntegerConstantExpr(IdxInt, S.Context)) {
234 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
235 << Attr.getName() << AttrArgNum << AANT_ArgumentIntegerConstant
236 << IdxExpr->getSourceRange();
240 Idx = IdxInt.getLimitedValue();
241 if (Idx < 1 || (!IV && Idx > NumParams)) {
242 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
243 << Attr.getName() << AttrArgNum << IdxExpr->getSourceRange();
246 Idx--; // Convert to zero-based.
247 if (HasImplicitThisParam) {
249 S.Diag(Attr.getLoc(),
250 diag::err_attribute_invalid_implicit_this_argument)
251 << Attr.getName() << IdxExpr->getSourceRange();
260 /// \brief Check if the argument \p ArgNum of \p Attr is a ASCII string literal.
261 /// If not emit an error and return false. If the argument is an identifier it
262 /// will emit an error with a fixit hint and treat it as if it was a string
264 bool Sema::checkStringLiteralArgumentAttr(const AttributeList &Attr,
265 unsigned ArgNum, StringRef &Str,
266 SourceLocation *ArgLocation) {
267 // Look for identifiers. If we have one emit a hint to fix it to a literal.
268 if (Attr.isArgIdent(ArgNum)) {
269 IdentifierLoc *Loc = Attr.getArgAsIdent(ArgNum);
270 Diag(Loc->Loc, diag::err_attribute_argument_type)
271 << Attr.getName() << AANT_ArgumentString
272 << FixItHint::CreateInsertion(Loc->Loc, "\"")
273 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(Loc->Loc), "\"");
274 Str = Loc->Ident->getName();
276 *ArgLocation = Loc->Loc;
280 // Now check for an actual string literal.
281 Expr *ArgExpr = Attr.getArgAsExpr(ArgNum);
282 StringLiteral *Literal = dyn_cast<StringLiteral>(ArgExpr->IgnoreParenCasts());
284 *ArgLocation = ArgExpr->getLocStart();
286 if (!Literal || !Literal->isAscii()) {
287 Diag(ArgExpr->getLocStart(), diag::err_attribute_argument_type)
288 << Attr.getName() << AANT_ArgumentString;
292 Str = Literal->getString();
296 /// \brief Applies the given attribute to the Decl without performing any
297 /// additional semantic checking.
298 template <typename AttrType>
299 static void handleSimpleAttribute(Sema &S, Decl *D,
300 const AttributeList &Attr) {
301 D->addAttr(::new (S.Context) AttrType(Attr.getRange(), S.Context,
302 Attr.getAttributeSpellingListIndex()));
305 /// \brief Check if the passed-in expression is of type int or bool.
306 static bool isIntOrBool(Expr *Exp) {
307 QualType QT = Exp->getType();
308 return QT->isBooleanType() || QT->isIntegerType();
312 // Check to see if the type is a smart pointer of some kind. We assume
313 // it's a smart pointer if it defines both operator-> and operator*.
314 static bool threadSafetyCheckIsSmartPointer(Sema &S, const RecordType* RT) {
315 DeclContextLookupConstResult Res1 = RT->getDecl()->lookup(
316 S.Context.DeclarationNames.getCXXOperatorName(OO_Star));
320 DeclContextLookupConstResult Res2 = RT->getDecl()->lookup(
321 S.Context.DeclarationNames.getCXXOperatorName(OO_Arrow));
328 /// \brief Check if passed in Decl is a pointer type.
329 /// Note that this function may produce an error message.
330 /// \return true if the Decl is a pointer type; false otherwise
331 static bool threadSafetyCheckIsPointer(Sema &S, const Decl *D,
332 const AttributeList &Attr) {
333 const ValueDecl *vd = cast<ValueDecl>(D);
334 QualType QT = vd->getType();
335 if (QT->isAnyPointerType())
338 if (const RecordType *RT = QT->getAs<RecordType>()) {
339 // If it's an incomplete type, it could be a smart pointer; skip it.
340 // (We don't want to force template instantiation if we can avoid it,
341 // since that would alter the order in which templates are instantiated.)
342 if (RT->isIncompleteType())
345 if (threadSafetyCheckIsSmartPointer(S, RT))
349 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_pointer)
350 << Attr.getName() << QT;
354 /// \brief Checks that the passed in QualType either is of RecordType or points
355 /// to RecordType. Returns the relevant RecordType, null if it does not exit.
356 static const RecordType *getRecordType(QualType QT) {
357 if (const RecordType *RT = QT->getAs<RecordType>())
360 // Now check if we point to record type.
361 if (const PointerType *PT = QT->getAs<PointerType>())
362 return PT->getPointeeType()->getAs<RecordType>();
367 static bool checkRecordTypeForCapability(Sema &S, QualType Ty) {
368 const RecordType *RT = getRecordType(Ty);
373 // Don't check for the capability if the class hasn't been defined yet.
374 if (RT->isIncompleteType())
377 // Allow smart pointers to be used as capability objects.
378 // FIXME -- Check the type that the smart pointer points to.
379 if (threadSafetyCheckIsSmartPointer(S, RT))
382 // Check if the record itself has a capability.
383 RecordDecl *RD = RT->getDecl();
384 if (RD->hasAttr<CapabilityAttr>())
387 // Else check if any base classes have a capability.
388 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
389 CXXBasePaths BPaths(false, false);
390 if (CRD->lookupInBases([](const CXXBaseSpecifier *BS, CXXBasePath &P,
392 return BS->getType()->getAs<RecordType>()
393 ->getDecl()->hasAttr<CapabilityAttr>();
400 static bool checkTypedefTypeForCapability(QualType Ty) {
401 const auto *TD = Ty->getAs<TypedefType>();
405 TypedefNameDecl *TN = TD->getDecl();
409 return TN->hasAttr<CapabilityAttr>();
412 static bool typeHasCapability(Sema &S, QualType Ty) {
413 if (checkTypedefTypeForCapability(Ty))
416 if (checkRecordTypeForCapability(S, Ty))
422 static bool isCapabilityExpr(Sema &S, const Expr *Ex) {
423 // Capability expressions are simple expressions involving the boolean logic
424 // operators &&, || or !, a simple DeclRefExpr, CastExpr or a ParenExpr. Once
425 // a DeclRefExpr is found, its type should be checked to determine whether it
426 // is a capability or not.
428 if (const auto *E = dyn_cast<DeclRefExpr>(Ex))
429 return typeHasCapability(S, E->getType());
430 else if (const auto *E = dyn_cast<CastExpr>(Ex))
431 return isCapabilityExpr(S, E->getSubExpr());
432 else if (const auto *E = dyn_cast<ParenExpr>(Ex))
433 return isCapabilityExpr(S, E->getSubExpr());
434 else if (const auto *E = dyn_cast<UnaryOperator>(Ex)) {
435 if (E->getOpcode() == UO_LNot)
436 return isCapabilityExpr(S, E->getSubExpr());
438 } else if (const auto *E = dyn_cast<BinaryOperator>(Ex)) {
439 if (E->getOpcode() == BO_LAnd || E->getOpcode() == BO_LOr)
440 return isCapabilityExpr(S, E->getLHS()) &&
441 isCapabilityExpr(S, E->getRHS());
448 /// \brief Checks that all attribute arguments, starting from Sidx, resolve to
449 /// a capability object.
450 /// \param Sidx The attribute argument index to start checking with.
451 /// \param ParamIdxOk Whether an argument can be indexing into a function
453 static void checkAttrArgsAreCapabilityObjs(Sema &S, Decl *D,
454 const AttributeList &Attr,
455 SmallVectorImpl<Expr *> &Args,
457 bool ParamIdxOk = false) {
458 for (unsigned Idx = Sidx; Idx < Attr.getNumArgs(); ++Idx) {
459 Expr *ArgExp = Attr.getArgAsExpr(Idx);
461 if (ArgExp->isTypeDependent()) {
462 // FIXME -- need to check this again on template instantiation
463 Args.push_back(ArgExp);
467 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(ArgExp)) {
468 if (StrLit->getLength() == 0 ||
469 (StrLit->isAscii() && StrLit->getString() == StringRef("*"))) {
470 // Pass empty strings to the analyzer without warnings.
471 // Treat "*" as the universal lock.
472 Args.push_back(ArgExp);
476 // We allow constant strings to be used as a placeholder for expressions
477 // that are not valid C++ syntax, but warn that they are ignored.
478 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_ignored) <<
480 Args.push_back(ArgExp);
484 QualType ArgTy = ArgExp->getType();
486 // A pointer to member expression of the form &MyClass::mu is treated
487 // specially -- we need to look at the type of the member.
488 if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(ArgExp))
489 if (UOp->getOpcode() == UO_AddrOf)
490 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(UOp->getSubExpr()))
491 if (DRE->getDecl()->isCXXInstanceMember())
492 ArgTy = DRE->getDecl()->getType();
494 // First see if we can just cast to record type, or pointer to record type.
495 const RecordType *RT = getRecordType(ArgTy);
497 // Now check if we index into a record type function param.
498 if(!RT && ParamIdxOk) {
499 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
500 IntegerLiteral *IL = dyn_cast<IntegerLiteral>(ArgExp);
502 unsigned int NumParams = FD->getNumParams();
503 llvm::APInt ArgValue = IL->getValue();
504 uint64_t ParamIdxFromOne = ArgValue.getZExtValue();
505 uint64_t ParamIdxFromZero = ParamIdxFromOne - 1;
506 if(!ArgValue.isStrictlyPositive() || ParamIdxFromOne > NumParams) {
507 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_range)
508 << Attr.getName() << Idx + 1 << NumParams;
511 ArgTy = FD->getParamDecl(ParamIdxFromZero)->getType();
515 // If the type does not have a capability, see if the components of the
516 // expression have capabilities. This allows for writing C code where the
517 // capability may be on the type, and the expression is a capability
518 // boolean logic expression. Eg) requires_capability(A || B && !C)
519 if (!typeHasCapability(S, ArgTy) && !isCapabilityExpr(S, ArgExp))
520 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_argument_not_lockable)
521 << Attr.getName() << ArgTy;
523 Args.push_back(ArgExp);
527 //===----------------------------------------------------------------------===//
528 // Attribute Implementations
529 //===----------------------------------------------------------------------===//
531 // FIXME: All this manual attribute parsing code is gross. At the
532 // least add some helper functions to check most argument patterns (#
533 // and types of args).
535 static void handlePtGuardedVarAttr(Sema &S, Decl *D,
536 const AttributeList &Attr) {
537 if (!threadSafetyCheckIsPointer(S, D, Attr))
540 D->addAttr(::new (S.Context)
541 PtGuardedVarAttr(Attr.getRange(), S.Context,
542 Attr.getAttributeSpellingListIndex()));
545 static bool checkGuardedByAttrCommon(Sema &S, Decl *D,
546 const AttributeList &Attr,
548 SmallVector<Expr*, 1> Args;
549 // check that all arguments are lockable objects
550 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
551 unsigned Size = Args.size();
560 static void handleGuardedByAttr(Sema &S, Decl *D, const AttributeList &Attr) {
562 if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
565 D->addAttr(::new (S.Context) GuardedByAttr(Attr.getRange(), S.Context, Arg,
566 Attr.getAttributeSpellingListIndex()));
569 static void handlePtGuardedByAttr(Sema &S, Decl *D,
570 const AttributeList &Attr) {
572 if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
575 if (!threadSafetyCheckIsPointer(S, D, Attr))
578 D->addAttr(::new (S.Context) PtGuardedByAttr(Attr.getRange(),
580 Attr.getAttributeSpellingListIndex()));
583 static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D,
584 const AttributeList &Attr,
585 SmallVectorImpl<Expr *> &Args) {
586 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
589 // Check that this attribute only applies to lockable types.
590 QualType QT = cast<ValueDecl>(D)->getType();
591 if (!QT->isDependentType()) {
592 const RecordType *RT = getRecordType(QT);
593 if (!RT || !RT->getDecl()->hasAttr<CapabilityAttr>()) {
594 S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_lockable)
600 // Check that all arguments are lockable objects.
601 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
608 static void handleAcquiredAfterAttr(Sema &S, Decl *D,
609 const AttributeList &Attr) {
610 SmallVector<Expr*, 1> Args;
611 if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
614 Expr **StartArg = &Args[0];
615 D->addAttr(::new (S.Context)
616 AcquiredAfterAttr(Attr.getRange(), S.Context,
617 StartArg, Args.size(),
618 Attr.getAttributeSpellingListIndex()));
621 static void handleAcquiredBeforeAttr(Sema &S, Decl *D,
622 const AttributeList &Attr) {
623 SmallVector<Expr*, 1> Args;
624 if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
627 Expr **StartArg = &Args[0];
628 D->addAttr(::new (S.Context)
629 AcquiredBeforeAttr(Attr.getRange(), S.Context,
630 StartArg, Args.size(),
631 Attr.getAttributeSpellingListIndex()));
634 static bool checkLockFunAttrCommon(Sema &S, Decl *D,
635 const AttributeList &Attr,
636 SmallVectorImpl<Expr *> &Args) {
637 // zero or more arguments ok
638 // check that all arguments are lockable objects
639 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true);
644 static void handleAssertSharedLockAttr(Sema &S, Decl *D,
645 const AttributeList &Attr) {
646 SmallVector<Expr*, 1> Args;
647 if (!checkLockFunAttrCommon(S, D, Attr, Args))
650 unsigned Size = Args.size();
651 Expr **StartArg = Size == 0 ? nullptr : &Args[0];
652 D->addAttr(::new (S.Context)
653 AssertSharedLockAttr(Attr.getRange(), S.Context, StartArg, Size,
654 Attr.getAttributeSpellingListIndex()));
657 static void handleAssertExclusiveLockAttr(Sema &S, Decl *D,
658 const AttributeList &Attr) {
659 SmallVector<Expr*, 1> Args;
660 if (!checkLockFunAttrCommon(S, D, Attr, Args))
663 unsigned Size = Args.size();
664 Expr **StartArg = Size == 0 ? nullptr : &Args[0];
665 D->addAttr(::new (S.Context)
666 AssertExclusiveLockAttr(Attr.getRange(), S.Context,
668 Attr.getAttributeSpellingListIndex()));
672 static bool checkTryLockFunAttrCommon(Sema &S, Decl *D,
673 const AttributeList &Attr,
674 SmallVectorImpl<Expr *> &Args) {
675 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
678 if (!isIntOrBool(Attr.getArgAsExpr(0))) {
679 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
680 << Attr.getName() << 1 << AANT_ArgumentIntOrBool;
684 // check that all arguments are lockable objects
685 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 1);
690 static void handleSharedTrylockFunctionAttr(Sema &S, Decl *D,
691 const AttributeList &Attr) {
692 SmallVector<Expr*, 2> Args;
693 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
696 D->addAttr(::new (S.Context)
697 SharedTrylockFunctionAttr(Attr.getRange(), S.Context,
698 Attr.getArgAsExpr(0),
699 Args.data(), Args.size(),
700 Attr.getAttributeSpellingListIndex()));
703 static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D,
704 const AttributeList &Attr) {
705 SmallVector<Expr*, 2> Args;
706 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
709 D->addAttr(::new (S.Context)
710 ExclusiveTrylockFunctionAttr(Attr.getRange(), S.Context,
711 Attr.getArgAsExpr(0),
712 Args.data(), Args.size(),
713 Attr.getAttributeSpellingListIndex()));
716 static void handleLockReturnedAttr(Sema &S, Decl *D,
717 const AttributeList &Attr) {
718 // check that the argument is lockable object
719 SmallVector<Expr*, 1> Args;
720 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
721 unsigned Size = Args.size();
725 D->addAttr(::new (S.Context)
726 LockReturnedAttr(Attr.getRange(), S.Context, Args[0],
727 Attr.getAttributeSpellingListIndex()));
730 static void handleLocksExcludedAttr(Sema &S, Decl *D,
731 const AttributeList &Attr) {
732 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
735 // check that all arguments are lockable objects
736 SmallVector<Expr*, 1> Args;
737 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
738 unsigned Size = Args.size();
741 Expr **StartArg = &Args[0];
743 D->addAttr(::new (S.Context)
744 LocksExcludedAttr(Attr.getRange(), S.Context, StartArg, Size,
745 Attr.getAttributeSpellingListIndex()));
748 static void handleEnableIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
749 Expr *Cond = Attr.getArgAsExpr(0);
750 if (!Cond->isTypeDependent()) {
751 ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
752 if (Converted.isInvalid())
754 Cond = Converted.get();
758 if (!S.checkStringLiteralArgumentAttr(Attr, 1, Msg))
761 SmallVector<PartialDiagnosticAt, 8> Diags;
762 if (!Cond->isValueDependent() &&
763 !Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(D),
765 S.Diag(Attr.getLoc(), diag::err_enable_if_never_constant_expr);
766 for (int I = 0, N = Diags.size(); I != N; ++I)
767 S.Diag(Diags[I].first, Diags[I].second);
771 D->addAttr(::new (S.Context)
772 EnableIfAttr(Attr.getRange(), S.Context, Cond, Msg,
773 Attr.getAttributeSpellingListIndex()));
776 static void handleConsumableAttr(Sema &S, Decl *D, const AttributeList &Attr) {
777 ConsumableAttr::ConsumedState DefaultState;
779 if (Attr.isArgIdent(0)) {
780 IdentifierLoc *IL = Attr.getArgAsIdent(0);
781 if (!ConsumableAttr::ConvertStrToConsumedState(IL->Ident->getName(),
783 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
784 << Attr.getName() << IL->Ident;
788 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
789 << Attr.getName() << AANT_ArgumentIdentifier;
793 D->addAttr(::new (S.Context)
794 ConsumableAttr(Attr.getRange(), S.Context, DefaultState,
795 Attr.getAttributeSpellingListIndex()));
799 static bool checkForConsumableClass(Sema &S, const CXXMethodDecl *MD,
800 const AttributeList &Attr) {
801 ASTContext &CurrContext = S.getASTContext();
802 QualType ThisType = MD->getThisType(CurrContext)->getPointeeType();
804 if (const CXXRecordDecl *RD = ThisType->getAsCXXRecordDecl()) {
805 if (!RD->hasAttr<ConsumableAttr>()) {
806 S.Diag(Attr.getLoc(), diag::warn_attr_on_unconsumable_class) <<
807 RD->getNameAsString();
817 static void handleCallableWhenAttr(Sema &S, Decl *D,
818 const AttributeList &Attr) {
819 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
822 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
825 SmallVector<CallableWhenAttr::ConsumedState, 3> States;
826 for (unsigned ArgIndex = 0; ArgIndex < Attr.getNumArgs(); ++ArgIndex) {
827 CallableWhenAttr::ConsumedState CallableState;
829 StringRef StateString;
831 if (!S.checkStringLiteralArgumentAttr(Attr, ArgIndex, StateString, &Loc))
834 if (!CallableWhenAttr::ConvertStrToConsumedState(StateString,
836 S.Diag(Loc, diag::warn_attribute_type_not_supported)
837 << Attr.getName() << StateString;
841 States.push_back(CallableState);
844 D->addAttr(::new (S.Context)
845 CallableWhenAttr(Attr.getRange(), S.Context, States.data(),
846 States.size(), Attr.getAttributeSpellingListIndex()));
850 static void handleParamTypestateAttr(Sema &S, Decl *D,
851 const AttributeList &Attr) {
852 if (!checkAttributeNumArgs(S, Attr, 1)) return;
854 ParamTypestateAttr::ConsumedState ParamState;
856 if (Attr.isArgIdent(0)) {
857 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
858 StringRef StateString = Ident->Ident->getName();
860 if (!ParamTypestateAttr::ConvertStrToConsumedState(StateString,
862 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
863 << Attr.getName() << StateString;
867 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
868 Attr.getName() << AANT_ArgumentIdentifier;
872 // FIXME: This check is currently being done in the analysis. It can be
873 // enabled here only after the parser propagates attributes at
874 // template specialization definition, not declaration.
875 //QualType ReturnType = cast<ParmVarDecl>(D)->getType();
876 //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
878 //if (!RD || !RD->hasAttr<ConsumableAttr>()) {
879 // S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
880 // ReturnType.getAsString();
884 D->addAttr(::new (S.Context)
885 ParamTypestateAttr(Attr.getRange(), S.Context, ParamState,
886 Attr.getAttributeSpellingListIndex()));
890 static void handleReturnTypestateAttr(Sema &S, Decl *D,
891 const AttributeList &Attr) {
892 if (!checkAttributeNumArgs(S, Attr, 1)) return;
894 ReturnTypestateAttr::ConsumedState ReturnState;
896 if (Attr.isArgIdent(0)) {
897 IdentifierLoc *IL = Attr.getArgAsIdent(0);
898 if (!ReturnTypestateAttr::ConvertStrToConsumedState(IL->Ident->getName(),
900 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
901 << Attr.getName() << IL->Ident;
905 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
906 Attr.getName() << AANT_ArgumentIdentifier;
910 // FIXME: This check is currently being done in the analysis. It can be
911 // enabled here only after the parser propagates attributes at
912 // template specialization definition, not declaration.
913 //QualType ReturnType;
915 //if (const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D)) {
916 // ReturnType = Param->getType();
918 //} else if (const CXXConstructorDecl *Constructor =
919 // dyn_cast<CXXConstructorDecl>(D)) {
920 // ReturnType = Constructor->getThisType(S.getASTContext())->getPointeeType();
924 // ReturnType = cast<FunctionDecl>(D)->getCallResultType();
927 //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
929 //if (!RD || !RD->hasAttr<ConsumableAttr>()) {
930 // S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
931 // ReturnType.getAsString();
935 D->addAttr(::new (S.Context)
936 ReturnTypestateAttr(Attr.getRange(), S.Context, ReturnState,
937 Attr.getAttributeSpellingListIndex()));
941 static void handleSetTypestateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
942 if (!checkAttributeNumArgs(S, Attr, 1))
945 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
948 SetTypestateAttr::ConsumedState NewState;
949 if (Attr.isArgIdent(0)) {
950 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
951 StringRef Param = Ident->Ident->getName();
952 if (!SetTypestateAttr::ConvertStrToConsumedState(Param, NewState)) {
953 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
954 << Attr.getName() << Param;
958 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
959 Attr.getName() << AANT_ArgumentIdentifier;
963 D->addAttr(::new (S.Context)
964 SetTypestateAttr(Attr.getRange(), S.Context, NewState,
965 Attr.getAttributeSpellingListIndex()));
968 static void handleTestTypestateAttr(Sema &S, Decl *D,
969 const AttributeList &Attr) {
970 if (!checkAttributeNumArgs(S, Attr, 1))
973 if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
976 TestTypestateAttr::ConsumedState TestState;
977 if (Attr.isArgIdent(0)) {
978 IdentifierLoc *Ident = Attr.getArgAsIdent(0);
979 StringRef Param = Ident->Ident->getName();
980 if (!TestTypestateAttr::ConvertStrToConsumedState(Param, TestState)) {
981 S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
982 << Attr.getName() << Param;
986 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
987 Attr.getName() << AANT_ArgumentIdentifier;
991 D->addAttr(::new (S.Context)
992 TestTypestateAttr(Attr.getRange(), S.Context, TestState,
993 Attr.getAttributeSpellingListIndex()));
996 static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D,
997 const AttributeList &Attr) {
998 // Remember this typedef decl, we will need it later for diagnostics.
999 S.ExtVectorDecls.push_back(cast<TypedefNameDecl>(D));
1002 static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1003 if (TagDecl *TD = dyn_cast<TagDecl>(D))
1004 TD->addAttr(::new (S.Context) PackedAttr(Attr.getRange(), S.Context,
1005 Attr.getAttributeSpellingListIndex()));
1006 else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
1007 // If the alignment is less than or equal to 8 bits, the packed attribute
1009 if (!FD->getType()->isDependentType() &&
1010 !FD->getType()->isIncompleteType() &&
1011 S.Context.getTypeAlign(FD->getType()) <= 8)
1012 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored_for_field_of_type)
1013 << Attr.getName() << FD->getType();
1015 FD->addAttr(::new (S.Context)
1016 PackedAttr(Attr.getRange(), S.Context,
1017 Attr.getAttributeSpellingListIndex()));
1019 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1022 static bool checkIBOutletCommon(Sema &S, Decl *D, const AttributeList &Attr) {
1023 // The IBOutlet/IBOutletCollection attributes only apply to instance
1024 // variables or properties of Objective-C classes. The outlet must also
1025 // have an object reference type.
1026 if (const ObjCIvarDecl *VD = dyn_cast<ObjCIvarDecl>(D)) {
1027 if (!VD->getType()->getAs<ObjCObjectPointerType>()) {
1028 S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
1029 << Attr.getName() << VD->getType() << 0;
1033 else if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
1034 if (!PD->getType()->getAs<ObjCObjectPointerType>()) {
1035 S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
1036 << Attr.getName() << PD->getType() << 1;
1041 S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName();
1048 static void handleIBOutlet(Sema &S, Decl *D, const AttributeList &Attr) {
1049 if (!checkIBOutletCommon(S, D, Attr))
1052 D->addAttr(::new (S.Context)
1053 IBOutletAttr(Attr.getRange(), S.Context,
1054 Attr.getAttributeSpellingListIndex()));
1057 static void handleIBOutletCollection(Sema &S, Decl *D,
1058 const AttributeList &Attr) {
1060 // The iboutletcollection attribute can have zero or one arguments.
1061 if (Attr.getNumArgs() > 1) {
1062 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
1063 << Attr.getName() << 1;
1067 if (!checkIBOutletCommon(S, D, Attr))
1072 if (Attr.hasParsedType())
1073 PT = Attr.getTypeArg();
1075 PT = S.getTypeName(S.Context.Idents.get("NSObject"), Attr.getLoc(),
1076 S.getScopeForContext(D->getDeclContext()->getParent()));
1078 S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << "NSObject";
1083 TypeSourceInfo *QTLoc = nullptr;
1084 QualType QT = S.GetTypeFromParser(PT, &QTLoc);
1086 QTLoc = S.Context.getTrivialTypeSourceInfo(QT, Attr.getLoc());
1088 // Diagnose use of non-object type in iboutletcollection attribute.
1089 // FIXME. Gnu attribute extension ignores use of builtin types in
1090 // attributes. So, __attribute__((iboutletcollection(char))) will be
1091 // treated as __attribute__((iboutletcollection())).
1092 if (!QT->isObjCIdType() && !QT->isObjCObjectType()) {
1093 S.Diag(Attr.getLoc(),
1094 QT->isBuiltinType() ? diag::err_iboutletcollection_builtintype
1095 : diag::err_iboutletcollection_type) << QT;
1099 D->addAttr(::new (S.Context)
1100 IBOutletCollectionAttr(Attr.getRange(), S.Context, QTLoc,
1101 Attr.getAttributeSpellingListIndex()));
1104 static void possibleTransparentUnionPointerType(QualType &T) {
1105 if (const RecordType *UT = T->getAsUnionType())
1106 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) {
1107 RecordDecl *UD = UT->getDecl();
1108 for (const auto *I : UD->fields()) {
1109 QualType QT = I->getType();
1110 if (QT->isAnyPointerType() || QT->isBlockPointerType()) {
1118 static bool attrNonNullArgCheck(Sema &S, QualType T, const AttributeList &Attr,
1119 SourceRange R, bool isReturnValue = false) {
1120 T = T.getNonReferenceType();
1121 possibleTransparentUnionPointerType(T);
1123 if (!T->isAnyPointerType() && !T->isBlockPointerType()) {
1124 S.Diag(Attr.getLoc(),
1125 isReturnValue ? diag::warn_attribute_return_pointers_only
1126 : diag::warn_attribute_pointers_only)
1127 << Attr.getName() << R;
1133 static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1134 SmallVector<unsigned, 8> NonNullArgs;
1135 for (unsigned i = 0; i < Attr.getNumArgs(); ++i) {
1136 Expr *Ex = Attr.getArgAsExpr(i);
1138 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, i + 1, Ex, Idx))
1141 // Is the function argument a pointer type?
1142 // FIXME: Should also highlight argument in decl in the diagnostic.
1143 if (!attrNonNullArgCheck(S, getFunctionOrMethodParamType(D, Idx), Attr,
1144 Ex->getSourceRange()))
1147 NonNullArgs.push_back(Idx);
1150 // If no arguments were specified to __attribute__((nonnull)) then all pointer
1151 // arguments have a nonnull attribute.
1152 if (NonNullArgs.empty()) {
1153 for (unsigned i = 0, e = getFunctionOrMethodNumParams(D); i != e; ++i) {
1154 QualType T = getFunctionOrMethodParamType(D, i).getNonReferenceType();
1155 possibleTransparentUnionPointerType(T);
1156 if (T->isAnyPointerType() || T->isBlockPointerType())
1157 NonNullArgs.push_back(i);
1160 // No pointer arguments?
1161 if (NonNullArgs.empty()) {
1162 // Warn the trivial case only if attribute is not coming from a
1163 // macro instantiation.
1164 if (Attr.getLoc().isFileID())
1165 S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers);
1170 unsigned *start = &NonNullArgs[0];
1171 unsigned size = NonNullArgs.size();
1172 llvm::array_pod_sort(start, start + size);
1173 D->addAttr(::new (S.Context)
1174 NonNullAttr(Attr.getRange(), S.Context, start, size,
1175 Attr.getAttributeSpellingListIndex()));
1178 static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
1179 const AttributeList &Attr) {
1180 if (Attr.getNumArgs() > 0) {
1181 if (D->getFunctionType()) {
1182 handleNonNullAttr(S, D, Attr);
1184 S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_parm_no_args)
1185 << D->getSourceRange();
1190 // Is the argument a pointer type?
1191 if (!attrNonNullArgCheck(S, D->getType(), Attr, D->getSourceRange()))
1194 D->addAttr(::new (S.Context)
1195 NonNullAttr(Attr.getRange(), S.Context, nullptr, 0,
1196 Attr.getAttributeSpellingListIndex()));
1199 static void handleReturnsNonNullAttr(Sema &S, Decl *D,
1200 const AttributeList &Attr) {
1201 QualType ResultType = getFunctionOrMethodResultType(D);
1202 if (!attrNonNullArgCheck(S, ResultType, Attr, Attr.getRange(),
1203 /* isReturnValue */ true))
1206 D->addAttr(::new (S.Context)
1207 ReturnsNonNullAttr(Attr.getRange(), S.Context,
1208 Attr.getAttributeSpellingListIndex()));
1211 static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
1212 // This attribute must be applied to a function declaration. The first
1213 // argument to the attribute must be an identifier, the name of the resource,
1214 // for example: malloc. The following arguments must be argument indexes, the
1215 // arguments must be of integer type for Returns, otherwise of pointer type.
1216 // The difference between Holds and Takes is that a pointer may still be used
1217 // after being held. free() should be __attribute((ownership_takes)), whereas
1218 // a list append function may well be __attribute((ownership_holds)).
1220 if (!AL.isArgIdent(0)) {
1221 S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
1222 << AL.getName() << 1 << AANT_ArgumentIdentifier;
1226 // Figure out our Kind.
1227 OwnershipAttr::OwnershipKind K =
1228 OwnershipAttr(AL.getLoc(), S.Context, nullptr, nullptr, 0,
1229 AL.getAttributeSpellingListIndex()).getOwnKind();
1233 case OwnershipAttr::Takes:
1234 case OwnershipAttr::Holds:
1235 if (AL.getNumArgs() < 2) {
1236 S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments)
1237 << AL.getName() << 2;
1241 case OwnershipAttr::Returns:
1242 if (AL.getNumArgs() > 2) {
1243 S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments)
1244 << AL.getName() << 1;
1250 IdentifierInfo *Module = AL.getArgAsIdent(0)->Ident;
1252 // Normalize the argument, __foo__ becomes foo.
1253 StringRef ModuleName = Module->getName();
1254 if (ModuleName.startswith("__") && ModuleName.endswith("__") &&
1255 ModuleName.size() > 4) {
1256 ModuleName = ModuleName.drop_front(2).drop_back(2);
1257 Module = &S.PP.getIdentifierTable().get(ModuleName);
1260 SmallVector<unsigned, 8> OwnershipArgs;
1261 for (unsigned i = 1; i < AL.getNumArgs(); ++i) {
1262 Expr *Ex = AL.getArgAsExpr(i);
1264 if (!checkFunctionOrMethodParameterIndex(S, D, AL, i, Ex, Idx))
1267 // Is the function argument a pointer type?
1268 QualType T = getFunctionOrMethodParamType(D, Idx);
1269 int Err = -1; // No error
1271 case OwnershipAttr::Takes:
1272 case OwnershipAttr::Holds:
1273 if (!T->isAnyPointerType() && !T->isBlockPointerType())
1276 case OwnershipAttr::Returns:
1277 if (!T->isIntegerType())
1282 S.Diag(AL.getLoc(), diag::err_ownership_type) << AL.getName() << Err
1283 << Ex->getSourceRange();
1287 // Check we don't have a conflict with another ownership attribute.
1288 for (const auto *I : D->specific_attrs<OwnershipAttr>()) {
1289 // FIXME: A returns attribute should conflict with any returns attribute
1290 // with a different index too.
1291 if (I->getOwnKind() != K && I->args_end() !=
1292 std::find(I->args_begin(), I->args_end(), Idx)) {
1293 S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
1294 << AL.getName() << I;
1298 OwnershipArgs.push_back(Idx);
1301 unsigned* start = OwnershipArgs.data();
1302 unsigned size = OwnershipArgs.size();
1303 llvm::array_pod_sort(start, start + size);
1305 D->addAttr(::new (S.Context)
1306 OwnershipAttr(AL.getLoc(), S.Context, Module, start, size,
1307 AL.getAttributeSpellingListIndex()));
1310 static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1311 // Check the attribute arguments.
1312 if (Attr.getNumArgs() > 1) {
1313 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
1314 << Attr.getName() << 1;
1318 NamedDecl *nd = cast<NamedDecl>(D);
1322 // static int a __attribute__((weakref ("v2")));
1323 // static int b() __attribute__((weakref ("f3")));
1325 // and ignores the attributes of
1327 // static int a __attribute__((weakref ("v2")));
1330 const DeclContext *Ctx = D->getDeclContext()->getRedeclContext();
1331 if (!Ctx->isFileContext()) {
1332 S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_global_context)
1337 // The GCC manual says
1339 // At present, a declaration to which `weakref' is attached can only
1344 // Without a TARGET,
1345 // given as an argument to `weakref' or to `alias', `weakref' is
1346 // equivalent to `weak'.
1348 // gcc 4.4.1 will accept
1349 // int a7 __attribute__((weakref));
1351 // int a7 __attribute__((weak));
1352 // This looks like a bug in gcc. We reject that for now. We should revisit
1353 // it if this behaviour is actually used.
1356 // static ((alias ("y"), weakref)).
1357 // Should we? How to check that weakref is before or after alias?
1359 // FIXME: it would be good for us to keep the WeakRefAttr as-written instead
1360 // of transforming it into an AliasAttr. The WeakRefAttr never uses the
1361 // StringRef parameter it was given anyway.
1363 if (Attr.getNumArgs() && S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1364 // GCC will accept anything as the argument of weakref. Should we
1365 // check for an existing decl?
1366 D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
1367 Attr.getAttributeSpellingListIndex()));
1369 D->addAttr(::new (S.Context)
1370 WeakRefAttr(Attr.getRange(), S.Context,
1371 Attr.getAttributeSpellingListIndex()));
1374 static void handleAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1376 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1379 if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
1380 S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_darwin);
1384 // FIXME: check if target symbol exists in current file
1386 D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
1387 Attr.getAttributeSpellingListIndex()));
1390 static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1391 if (checkAttrMutualExclusion<HotAttr>(S, D, Attr))
1394 D->addAttr(::new (S.Context) ColdAttr(Attr.getRange(), S.Context,
1395 Attr.getAttributeSpellingListIndex()));
1398 static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1399 if (checkAttrMutualExclusion<ColdAttr>(S, D, Attr))
1402 D->addAttr(::new (S.Context) HotAttr(Attr.getRange(), S.Context,
1403 Attr.getAttributeSpellingListIndex()));
1406 static void handleTLSModelAttr(Sema &S, Decl *D,
1407 const AttributeList &Attr) {
1409 SourceLocation LiteralLoc;
1410 // Check that it is a string.
1411 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Model, &LiteralLoc))
1414 // Check that the value.
1415 if (Model != "global-dynamic" && Model != "local-dynamic"
1416 && Model != "initial-exec" && Model != "local-exec") {
1417 S.Diag(LiteralLoc, diag::err_attr_tlsmodel_arg);
1421 D->addAttr(::new (S.Context)
1422 TLSModelAttr(Attr.getRange(), S.Context, Model,
1423 Attr.getAttributeSpellingListIndex()));
1426 static void handleMallocAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1427 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1428 QualType RetTy = FD->getReturnType();
1429 if (RetTy->isAnyPointerType() || RetTy->isBlockPointerType()) {
1430 D->addAttr(::new (S.Context)
1431 MallocAttr(Attr.getRange(), S.Context,
1432 Attr.getAttributeSpellingListIndex()));
1437 S.Diag(Attr.getLoc(), diag::warn_attribute_malloc_pointer_only);
1440 static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1441 if (S.LangOpts.CPlusPlus) {
1442 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
1443 << Attr.getName() << AttributeLangSupport::Cpp;
1447 D->addAttr(::new (S.Context) CommonAttr(Attr.getRange(), S.Context,
1448 Attr.getAttributeSpellingListIndex()));
1451 static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &attr) {
1452 if (hasDeclarator(D)) return;
1454 if (S.CheckNoReturnAttr(attr)) return;
1456 if (!isa<ObjCMethodDecl>(D)) {
1457 S.Diag(attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1458 << attr.getName() << ExpectedFunctionOrMethod;
1462 D->addAttr(::new (S.Context)
1463 NoReturnAttr(attr.getRange(), S.Context,
1464 attr.getAttributeSpellingListIndex()));
1467 bool Sema::CheckNoReturnAttr(const AttributeList &attr) {
1468 if (!checkAttributeNumArgs(*this, attr, 0)) {
1476 static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D,
1477 const AttributeList &Attr) {
1479 // The checking path for 'noreturn' and 'analyzer_noreturn' are different
1480 // because 'analyzer_noreturn' does not impact the type.
1481 if (!isFunctionOrMethod(D) && !isa<BlockDecl>(D)) {
1482 ValueDecl *VD = dyn_cast<ValueDecl>(D);
1483 if (!VD || (!VD->getType()->isBlockPointerType() &&
1484 !VD->getType()->isFunctionPointerType())) {
1485 S.Diag(Attr.getLoc(),
1486 Attr.isCXX11Attribute() ? diag::err_attribute_wrong_decl_type
1487 : diag::warn_attribute_wrong_decl_type)
1488 << Attr.getName() << ExpectedFunctionMethodOrBlock;
1493 D->addAttr(::new (S.Context)
1494 AnalyzerNoReturnAttr(Attr.getRange(), S.Context,
1495 Attr.getAttributeSpellingListIndex()));
1498 // PS3 PPU-specific.
1499 static void handleVecReturnAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1501 Returning a Vector Class in Registers
1503 According to the PPU ABI specifications, a class with a single member of
1504 vector type is returned in memory when used as the return value of a function.
1505 This results in inefficient code when implementing vector classes. To return
1506 the value in a single vector register, add the vecreturn attribute to the
1507 class definition. This attribute is also applicable to struct types.
1513 __vector float xyzw;
1514 } __attribute__((vecreturn));
1516 Vector Add(Vector lhs, Vector rhs)
1519 result.xyzw = vec_add(lhs.xyzw, rhs.xyzw);
1520 return result; // This will be returned in a register
1523 if (VecReturnAttr *A = D->getAttr<VecReturnAttr>()) {
1524 S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << A;
1528 RecordDecl *record = cast<RecordDecl>(D);
1531 if (!isa<CXXRecordDecl>(record)) {
1532 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
1536 if (!cast<CXXRecordDecl>(record)->isPOD()) {
1537 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_pod_record);
1541 for (const auto *I : record->fields()) {
1542 if ((count == 1) || !I->getType()->isVectorType()) {
1543 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
1549 D->addAttr(::new (S.Context)
1550 VecReturnAttr(Attr.getRange(), S.Context,
1551 Attr.getAttributeSpellingListIndex()));
1554 static void handleDependencyAttr(Sema &S, Scope *Scope, Decl *D,
1555 const AttributeList &Attr) {
1556 if (isa<ParmVarDecl>(D)) {
1557 // [[carries_dependency]] can only be applied to a parameter if it is a
1558 // parameter of a function declaration or lambda.
1559 if (!(Scope->getFlags() & clang::Scope::FunctionDeclarationScope)) {
1560 S.Diag(Attr.getLoc(),
1561 diag::err_carries_dependency_param_not_function_decl);
1566 D->addAttr(::new (S.Context) CarriesDependencyAttr(
1567 Attr.getRange(), S.Context,
1568 Attr.getAttributeSpellingListIndex()));
1571 static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1572 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1573 if (VD->hasLocalStorage()) {
1574 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1577 } else if (!isFunctionOrMethod(D)) {
1578 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1579 << Attr.getName() << ExpectedVariableOrFunction;
1583 D->addAttr(::new (S.Context)
1584 UsedAttr(Attr.getRange(), S.Context,
1585 Attr.getAttributeSpellingListIndex()));
1588 static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1589 // check the attribute arguments.
1590 if (Attr.getNumArgs() > 1) {
1591 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
1592 << Attr.getName() << 1;
1596 uint32_t priority = ConstructorAttr::DefaultPriority;
1597 if (Attr.getNumArgs() > 0 &&
1598 !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
1601 D->addAttr(::new (S.Context)
1602 ConstructorAttr(Attr.getRange(), S.Context, priority,
1603 Attr.getAttributeSpellingListIndex()));
1606 static void handleDestructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1607 // check the attribute arguments.
1608 if (Attr.getNumArgs() > 1) {
1609 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
1610 << Attr.getName() << 1;
1614 uint32_t priority = DestructorAttr::DefaultPriority;
1615 if (Attr.getNumArgs() > 0 &&
1616 !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
1619 D->addAttr(::new (S.Context)
1620 DestructorAttr(Attr.getRange(), S.Context, priority,
1621 Attr.getAttributeSpellingListIndex()));
1624 template <typename AttrTy>
1625 static void handleAttrWithMessage(Sema &S, Decl *D,
1626 const AttributeList &Attr) {
1627 unsigned NumArgs = Attr.getNumArgs();
1629 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
1630 << Attr.getName() << 1;
1634 // Handle the case where the attribute has a text message.
1636 if (NumArgs == 1 && !S.checkStringLiteralArgumentAttr(Attr, 0, Str))
1639 D->addAttr(::new (S.Context) AttrTy(Attr.getRange(), S.Context, Str,
1640 Attr.getAttributeSpellingListIndex()));
1643 static void handleObjCSuppresProtocolAttr(Sema &S, Decl *D,
1644 const AttributeList &Attr) {
1645 if (!cast<ObjCProtocolDecl>(D)->isThisDeclarationADefinition()) {
1646 S.Diag(Attr.getLoc(), diag::err_objc_attr_protocol_requires_definition)
1647 << Attr.getName() << Attr.getRange();
1651 D->addAttr(::new (S.Context)
1652 ObjCExplicitProtocolImplAttr(Attr.getRange(), S.Context,
1653 Attr.getAttributeSpellingListIndex()));
1656 static bool checkAvailabilityAttr(Sema &S, SourceRange Range,
1657 IdentifierInfo *Platform,
1658 VersionTuple Introduced,
1659 VersionTuple Deprecated,
1660 VersionTuple Obsoleted) {
1661 StringRef PlatformName
1662 = AvailabilityAttr::getPrettyPlatformName(Platform->getName());
1663 if (PlatformName.empty())
1664 PlatformName = Platform->getName();
1666 // Ensure that Introduced <= Deprecated <= Obsoleted (although not all
1667 // of these steps are needed).
1668 if (!Introduced.empty() && !Deprecated.empty() &&
1669 !(Introduced <= Deprecated)) {
1670 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
1671 << 1 << PlatformName << Deprecated.getAsString()
1672 << 0 << Introduced.getAsString();
1676 if (!Introduced.empty() && !Obsoleted.empty() &&
1677 !(Introduced <= Obsoleted)) {
1678 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
1679 << 2 << PlatformName << Obsoleted.getAsString()
1680 << 0 << Introduced.getAsString();
1684 if (!Deprecated.empty() && !Obsoleted.empty() &&
1685 !(Deprecated <= Obsoleted)) {
1686 S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
1687 << 2 << PlatformName << Obsoleted.getAsString()
1688 << 1 << Deprecated.getAsString();
1695 /// \brief Check whether the two versions match.
1697 /// If either version tuple is empty, then they are assumed to match. If
1698 /// \p BeforeIsOkay is true, then \p X can be less than or equal to \p Y.
1699 static bool versionsMatch(const VersionTuple &X, const VersionTuple &Y,
1700 bool BeforeIsOkay) {
1701 if (X.empty() || Y.empty())
1707 if (BeforeIsOkay && X < Y)
1713 AvailabilityAttr *Sema::mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
1714 IdentifierInfo *Platform,
1715 VersionTuple Introduced,
1716 VersionTuple Deprecated,
1717 VersionTuple Obsoleted,
1721 unsigned AttrSpellingListIndex) {
1722 VersionTuple MergedIntroduced = Introduced;
1723 VersionTuple MergedDeprecated = Deprecated;
1724 VersionTuple MergedObsoleted = Obsoleted;
1725 bool FoundAny = false;
1727 if (D->hasAttrs()) {
1728 AttrVec &Attrs = D->getAttrs();
1729 for (unsigned i = 0, e = Attrs.size(); i != e;) {
1730 const AvailabilityAttr *OldAA = dyn_cast<AvailabilityAttr>(Attrs[i]);
1736 IdentifierInfo *OldPlatform = OldAA->getPlatform();
1737 if (OldPlatform != Platform) {
1743 VersionTuple OldIntroduced = OldAA->getIntroduced();
1744 VersionTuple OldDeprecated = OldAA->getDeprecated();
1745 VersionTuple OldObsoleted = OldAA->getObsoleted();
1746 bool OldIsUnavailable = OldAA->getUnavailable();
1748 if (!versionsMatch(OldIntroduced, Introduced, Override) ||
1749 !versionsMatch(Deprecated, OldDeprecated, Override) ||
1750 !versionsMatch(Obsoleted, OldObsoleted, Override) ||
1751 !(OldIsUnavailable == IsUnavailable ||
1752 (Override && !OldIsUnavailable && IsUnavailable))) {
1755 VersionTuple FirstVersion;
1756 VersionTuple SecondVersion;
1757 if (!versionsMatch(OldIntroduced, Introduced, Override)) {
1759 FirstVersion = OldIntroduced;
1760 SecondVersion = Introduced;
1761 } else if (!versionsMatch(Deprecated, OldDeprecated, Override)) {
1763 FirstVersion = Deprecated;
1764 SecondVersion = OldDeprecated;
1765 } else if (!versionsMatch(Obsoleted, OldObsoleted, Override)) {
1767 FirstVersion = Obsoleted;
1768 SecondVersion = OldObsoleted;
1772 Diag(OldAA->getLocation(),
1773 diag::warn_mismatched_availability_override_unavail)
1774 << AvailabilityAttr::getPrettyPlatformName(Platform->getName());
1776 Diag(OldAA->getLocation(),
1777 diag::warn_mismatched_availability_override)
1779 << AvailabilityAttr::getPrettyPlatformName(Platform->getName())
1780 << FirstVersion.getAsString() << SecondVersion.getAsString();
1782 Diag(Range.getBegin(), diag::note_overridden_method);
1784 Diag(OldAA->getLocation(), diag::warn_mismatched_availability);
1785 Diag(Range.getBegin(), diag::note_previous_attribute);
1788 Attrs.erase(Attrs.begin() + i);
1793 VersionTuple MergedIntroduced2 = MergedIntroduced;
1794 VersionTuple MergedDeprecated2 = MergedDeprecated;
1795 VersionTuple MergedObsoleted2 = MergedObsoleted;
1797 if (MergedIntroduced2.empty())
1798 MergedIntroduced2 = OldIntroduced;
1799 if (MergedDeprecated2.empty())
1800 MergedDeprecated2 = OldDeprecated;
1801 if (MergedObsoleted2.empty())
1802 MergedObsoleted2 = OldObsoleted;
1804 if (checkAvailabilityAttr(*this, OldAA->getRange(), Platform,
1805 MergedIntroduced2, MergedDeprecated2,
1806 MergedObsoleted2)) {
1807 Attrs.erase(Attrs.begin() + i);
1812 MergedIntroduced = MergedIntroduced2;
1813 MergedDeprecated = MergedDeprecated2;
1814 MergedObsoleted = MergedObsoleted2;
1820 MergedIntroduced == Introduced &&
1821 MergedDeprecated == Deprecated &&
1822 MergedObsoleted == Obsoleted)
1825 // Only create a new attribute if !Override, but we want to do
1827 if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
1828 MergedDeprecated, MergedObsoleted) &&
1830 return ::new (Context) AvailabilityAttr(Range, Context, Platform,
1831 Introduced, Deprecated,
1832 Obsoleted, IsUnavailable, Message,
1833 AttrSpellingListIndex);
1838 static void handleAvailabilityAttr(Sema &S, Decl *D,
1839 const AttributeList &Attr) {
1840 if (!checkAttributeNumArgs(S, Attr, 1))
1842 IdentifierLoc *Platform = Attr.getArgAsIdent(0);
1843 unsigned Index = Attr.getAttributeSpellingListIndex();
1845 IdentifierInfo *II = Platform->Ident;
1846 if (AvailabilityAttr::getPrettyPlatformName(II->getName()).empty())
1847 S.Diag(Platform->Loc, diag::warn_availability_unknown_platform)
1850 NamedDecl *ND = dyn_cast<NamedDecl>(D);
1852 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1856 AvailabilityChange Introduced = Attr.getAvailabilityIntroduced();
1857 AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated();
1858 AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted();
1859 bool IsUnavailable = Attr.getUnavailableLoc().isValid();
1861 if (const StringLiteral *SE =
1862 dyn_cast_or_null<StringLiteral>(Attr.getMessageExpr()))
1863 Str = SE->getString();
1865 AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND, Attr.getRange(), II,
1873 D->addAttr(NewAttr);
1877 static T *mergeVisibilityAttr(Sema &S, Decl *D, SourceRange range,
1878 typename T::VisibilityType value,
1879 unsigned attrSpellingListIndex) {
1880 T *existingAttr = D->getAttr<T>();
1882 typename T::VisibilityType existingValue = existingAttr->getVisibility();
1883 if (existingValue == value)
1885 S.Diag(existingAttr->getLocation(), diag::err_mismatched_visibility);
1886 S.Diag(range.getBegin(), diag::note_previous_attribute);
1889 return ::new (S.Context) T(range, S.Context, value, attrSpellingListIndex);
1892 VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range,
1893 VisibilityAttr::VisibilityType Vis,
1894 unsigned AttrSpellingListIndex) {
1895 return ::mergeVisibilityAttr<VisibilityAttr>(*this, D, Range, Vis,
1896 AttrSpellingListIndex);
1899 TypeVisibilityAttr *Sema::mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
1900 TypeVisibilityAttr::VisibilityType Vis,
1901 unsigned AttrSpellingListIndex) {
1902 return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, Range, Vis,
1903 AttrSpellingListIndex);
1906 static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr,
1907 bool isTypeVisibility) {
1908 // Visibility attributes don't mean anything on a typedef.
1909 if (isa<TypedefNameDecl>(D)) {
1910 S.Diag(Attr.getRange().getBegin(), diag::warn_attribute_ignored)
1915 // 'type_visibility' can only go on a type or namespace.
1916 if (isTypeVisibility &&
1917 !(isa<TagDecl>(D) ||
1918 isa<ObjCInterfaceDecl>(D) ||
1919 isa<NamespaceDecl>(D))) {
1920 S.Diag(Attr.getRange().getBegin(), diag::err_attribute_wrong_decl_type)
1921 << Attr.getName() << ExpectedTypeOrNamespace;
1925 // Check that the argument is a string literal.
1927 SourceLocation LiteralLoc;
1928 if (!S.checkStringLiteralArgumentAttr(Attr, 0, TypeStr, &LiteralLoc))
1931 VisibilityAttr::VisibilityType type;
1932 if (!VisibilityAttr::ConvertStrToVisibilityType(TypeStr, type)) {
1933 S.Diag(LiteralLoc, diag::warn_attribute_type_not_supported)
1934 << Attr.getName() << TypeStr;
1938 // Complain about attempts to use protected visibility on targets
1939 // (like Darwin) that don't support it.
1940 if (type == VisibilityAttr::Protected &&
1941 !S.Context.getTargetInfo().hasProtectedVisibility()) {
1942 S.Diag(Attr.getLoc(), diag::warn_attribute_protected_visibility);
1943 type = VisibilityAttr::Default;
1946 unsigned Index = Attr.getAttributeSpellingListIndex();
1947 clang::Attr *newAttr;
1948 if (isTypeVisibility) {
1949 newAttr = S.mergeTypeVisibilityAttr(D, Attr.getRange(),
1950 (TypeVisibilityAttr::VisibilityType) type,
1953 newAttr = S.mergeVisibilityAttr(D, Attr.getRange(), type, Index);
1956 D->addAttr(newAttr);
1959 static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl,
1960 const AttributeList &Attr) {
1961 ObjCMethodDecl *method = cast<ObjCMethodDecl>(decl);
1962 if (!Attr.isArgIdent(0)) {
1963 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
1964 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
1968 IdentifierLoc *IL = Attr.getArgAsIdent(0);
1969 ObjCMethodFamilyAttr::FamilyKind F;
1970 if (!ObjCMethodFamilyAttr::ConvertStrToFamilyKind(IL->Ident->getName(), F)) {
1971 S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << Attr.getName()
1976 if (F == ObjCMethodFamilyAttr::OMF_init &&
1977 !method->getReturnType()->isObjCObjectPointerType()) {
1978 S.Diag(method->getLocation(), diag::err_init_method_bad_return_type)
1979 << method->getReturnType();
1980 // Ignore the attribute.
1984 method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getRange(),
1986 Attr.getAttributeSpellingListIndex()));
1989 static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) {
1990 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
1991 QualType T = TD->getUnderlyingType();
1992 if (!T->isCARCBridgableType()) {
1993 S.Diag(TD->getLocation(), diag::err_nsobject_attribute);
1997 else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
1998 QualType T = PD->getType();
1999 if (!T->isCARCBridgableType()) {
2000 S.Diag(PD->getLocation(), diag::err_nsobject_attribute);
2005 // It is okay to include this attribute on properties, e.g.:
2007 // @property (retain, nonatomic) struct Bork *Q __attribute__((NSObject));
2009 // In this case it follows tradition and suppresses an error in the above
2011 S.Diag(D->getLocation(), diag::warn_nsobject_attribute);
2013 D->addAttr(::new (S.Context)
2014 ObjCNSObjectAttr(Attr.getRange(), S.Context,
2015 Attr.getAttributeSpellingListIndex()));
2018 static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2019 if (!Attr.isArgIdent(0)) {
2020 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2021 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
2025 IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
2026 BlocksAttr::BlockType type;
2027 if (!BlocksAttr::ConvertStrToBlockType(II->getName(), type)) {
2028 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
2029 << Attr.getName() << II;
2033 D->addAttr(::new (S.Context)
2034 BlocksAttr(Attr.getRange(), S.Context, type,
2035 Attr.getAttributeSpellingListIndex()));
2038 static void handleSentinelAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2039 // check the attribute arguments.
2040 if (Attr.getNumArgs() > 2) {
2041 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
2042 << Attr.getName() << 2;
2046 unsigned sentinel = (unsigned)SentinelAttr::DefaultSentinel;
2047 if (Attr.getNumArgs() > 0) {
2048 Expr *E = Attr.getArgAsExpr(0);
2049 llvm::APSInt Idx(32);
2050 if (E->isTypeDependent() || E->isValueDependent() ||
2051 !E->isIntegerConstantExpr(Idx, S.Context)) {
2052 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2053 << Attr.getName() << 1 << AANT_ArgumentIntegerConstant
2054 << E->getSourceRange();
2058 if (Idx.isSigned() && Idx.isNegative()) {
2059 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero)
2060 << E->getSourceRange();
2064 sentinel = Idx.getZExtValue();
2067 unsigned nullPos = (unsigned)SentinelAttr::DefaultNullPos;
2068 if (Attr.getNumArgs() > 1) {
2069 Expr *E = Attr.getArgAsExpr(1);
2070 llvm::APSInt Idx(32);
2071 if (E->isTypeDependent() || E->isValueDependent() ||
2072 !E->isIntegerConstantExpr(Idx, S.Context)) {
2073 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2074 << Attr.getName() << 2 << AANT_ArgumentIntegerConstant
2075 << E->getSourceRange();
2078 nullPos = Idx.getZExtValue();
2080 if ((Idx.isSigned() && Idx.isNegative()) || nullPos > 1) {
2081 // FIXME: This error message could be improved, it would be nice
2082 // to say what the bounds actually are.
2083 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one)
2084 << E->getSourceRange();
2089 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2090 const FunctionType *FT = FD->getType()->castAs<FunctionType>();
2091 if (isa<FunctionNoProtoType>(FT)) {
2092 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_named_arguments);
2096 if (!cast<FunctionProtoType>(FT)->isVariadic()) {
2097 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
2100 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
2101 if (!MD->isVariadic()) {
2102 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
2105 } else if (BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
2106 if (!BD->isVariadic()) {
2107 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 1;
2110 } else if (const VarDecl *V = dyn_cast<VarDecl>(D)) {
2111 QualType Ty = V->getType();
2112 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
2113 const FunctionType *FT = Ty->isFunctionPointerType()
2114 ? D->getFunctionType()
2115 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
2116 if (!cast<FunctionProtoType>(FT)->isVariadic()) {
2117 int m = Ty->isFunctionPointerType() ? 0 : 1;
2118 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m;
2122 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2123 << Attr.getName() << ExpectedFunctionMethodOrBlock;
2127 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2128 << Attr.getName() << ExpectedFunctionMethodOrBlock;
2131 D->addAttr(::new (S.Context)
2132 SentinelAttr(Attr.getRange(), S.Context, sentinel, nullPos,
2133 Attr.getAttributeSpellingListIndex()));
2136 static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) {
2137 if (D->getFunctionType() &&
2138 D->getFunctionType()->getReturnType()->isVoidType()) {
2139 S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
2140 << Attr.getName() << 0;
2143 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
2144 if (MD->getReturnType()->isVoidType()) {
2145 S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
2146 << Attr.getName() << 1;
2150 D->addAttr(::new (S.Context)
2151 WarnUnusedResultAttr(Attr.getRange(), S.Context,
2152 Attr.getAttributeSpellingListIndex()));
2155 static void handleWeakImportAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2156 // weak_import only applies to variable & function declarations.
2158 if (!D->canBeWeakImported(isDef)) {
2160 S.Diag(Attr.getLoc(), diag::warn_attribute_invalid_on_definition)
2162 else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) ||
2163 (S.Context.getTargetInfo().getTriple().isOSDarwin() &&
2164 (isa<ObjCInterfaceDecl>(D) || isa<EnumDecl>(D)))) {
2165 // Nothing to warn about here.
2167 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2168 << Attr.getName() << ExpectedVariableOrFunction;
2173 D->addAttr(::new (S.Context)
2174 WeakImportAttr(Attr.getRange(), S.Context,
2175 Attr.getAttributeSpellingListIndex()));
2178 // Handles reqd_work_group_size and work_group_size_hint.
2179 template <typename WorkGroupAttr>
2180 static void handleWorkGroupSize(Sema &S, Decl *D,
2181 const AttributeList &Attr) {
2183 for (unsigned i = 0; i < 3; ++i) {
2184 const Expr *E = Attr.getArgAsExpr(i);
2185 if (!checkUInt32Argument(S, Attr, E, WGSize[i], i))
2187 if (WGSize[i] == 0) {
2188 S.Diag(Attr.getLoc(), diag::err_attribute_argument_is_zero)
2189 << Attr.getName() << E->getSourceRange();
2194 WorkGroupAttr *Existing = D->getAttr<WorkGroupAttr>();
2195 if (Existing && !(Existing->getXDim() == WGSize[0] &&
2196 Existing->getYDim() == WGSize[1] &&
2197 Existing->getZDim() == WGSize[2]))
2198 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
2200 D->addAttr(::new (S.Context) WorkGroupAttr(Attr.getRange(), S.Context,
2201 WGSize[0], WGSize[1], WGSize[2],
2202 Attr.getAttributeSpellingListIndex()));
2205 static void handleVecTypeHint(Sema &S, Decl *D, const AttributeList &Attr) {
2206 if (!Attr.hasParsedType()) {
2207 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
2208 << Attr.getName() << 1;
2212 TypeSourceInfo *ParmTSI = nullptr;
2213 QualType ParmType = S.GetTypeFromParser(Attr.getTypeArg(), &ParmTSI);
2214 assert(ParmTSI && "no type source info for attribute argument");
2216 if (!ParmType->isExtVectorType() && !ParmType->isFloatingType() &&
2217 (ParmType->isBooleanType() ||
2218 !ParmType->isIntegralType(S.getASTContext()))) {
2219 S.Diag(Attr.getLoc(), diag::err_attribute_argument_vec_type_hint)
2224 if (VecTypeHintAttr *A = D->getAttr<VecTypeHintAttr>()) {
2225 if (!S.Context.hasSameType(A->getTypeHint(), ParmType)) {
2226 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
2231 D->addAttr(::new (S.Context) VecTypeHintAttr(Attr.getLoc(), S.Context,
2233 Attr.getAttributeSpellingListIndex()));
2236 SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range,
2238 unsigned AttrSpellingListIndex) {
2239 if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) {
2240 if (ExistingAttr->getName() == Name)
2242 Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section);
2243 Diag(Range.getBegin(), diag::note_previous_attribute);
2246 return ::new (Context) SectionAttr(Range, Context, Name,
2247 AttrSpellingListIndex);
2250 static void handleSectionAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2251 // Make sure that there is a string literal as the sections's single
2254 SourceLocation LiteralLoc;
2255 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &LiteralLoc))
2258 // If the target wants to validate the section specifier, make it happen.
2259 std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(Str);
2260 if (!Error.empty()) {
2261 S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target)
2266 unsigned Index = Attr.getAttributeSpellingListIndex();
2267 SectionAttr *NewAttr = S.mergeSectionAttr(D, Attr.getRange(), Str, Index);
2269 D->addAttr(NewAttr);
2273 static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2274 VarDecl *VD = cast<VarDecl>(D);
2275 if (!VD->hasLocalStorage()) {
2276 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
2280 Expr *E = Attr.getArgAsExpr(0);
2281 SourceLocation Loc = E->getExprLoc();
2282 FunctionDecl *FD = nullptr;
2283 DeclarationNameInfo NI;
2285 // gcc only allows for simple identifiers. Since we support more than gcc, we
2286 // will warn the user.
2287 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
2288 if (DRE->hasQualifier())
2289 S.Diag(Loc, diag::warn_cleanup_ext);
2290 FD = dyn_cast<FunctionDecl>(DRE->getDecl());
2291 NI = DRE->getNameInfo();
2293 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 1
2297 } else if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
2298 if (ULE->hasExplicitTemplateArgs())
2299 S.Diag(Loc, diag::warn_cleanup_ext);
2300 FD = S.ResolveSingleFunctionTemplateSpecialization(ULE, true);
2301 NI = ULE->getNameInfo();
2303 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 2
2305 if (ULE->getType() == S.Context.OverloadTy)
2306 S.NoteAllOverloadCandidates(ULE);
2310 S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 0;
2314 if (FD->getNumParams() != 1) {
2315 S.Diag(Loc, diag::err_attribute_cleanup_func_must_take_one_arg)
2320 // We're currently more strict than GCC about what function types we accept.
2321 // If this ever proves to be a problem it should be easy to fix.
2322 QualType Ty = S.Context.getPointerType(VD->getType());
2323 QualType ParamTy = FD->getParamDecl(0)->getType();
2324 if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(),
2325 ParamTy, Ty) != Sema::Compatible) {
2326 S.Diag(Loc, diag::err_attribute_cleanup_func_arg_incompatible_type)
2327 << NI.getName() << ParamTy << Ty;
2331 D->addAttr(::new (S.Context)
2332 CleanupAttr(Attr.getRange(), S.Context, FD,
2333 Attr.getAttributeSpellingListIndex()));
2336 /// Handle __attribute__((format_arg((idx)))) attribute based on
2337 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
2338 static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2339 Expr *IdxExpr = Attr.getArgAsExpr(0);
2341 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 1, IdxExpr, Idx))
2344 // make sure the format string is really a string
2345 QualType Ty = getFunctionOrMethodParamType(D, Idx);
2347 bool not_nsstring_type = !isNSStringType(Ty, S.Context);
2348 if (not_nsstring_type &&
2349 !isCFStringType(Ty, S.Context) &&
2350 (!Ty->isPointerType() ||
2351 !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
2352 // FIXME: Should highlight the actual expression that has the wrong type.
2353 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2354 << (not_nsstring_type ? "a string type" : "an NSString")
2355 << IdxExpr->getSourceRange();
2358 Ty = getFunctionOrMethodResultType(D);
2359 if (!isNSStringType(Ty, S.Context) &&
2360 !isCFStringType(Ty, S.Context) &&
2361 (!Ty->isPointerType() ||
2362 !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
2363 // FIXME: Should highlight the actual expression that has the wrong type.
2364 S.Diag(Attr.getLoc(), diag::err_format_attribute_result_not)
2365 << (not_nsstring_type ? "string type" : "NSString")
2366 << IdxExpr->getSourceRange();
2370 // We cannot use the Idx returned from checkFunctionOrMethodParameterIndex
2371 // because that has corrected for the implicit this parameter, and is zero-
2372 // based. The attribute expects what the user wrote explicitly.
2374 IdxExpr->EvaluateAsInt(Val, S.Context);
2376 D->addAttr(::new (S.Context)
2377 FormatArgAttr(Attr.getRange(), S.Context, Val.getZExtValue(),
2378 Attr.getAttributeSpellingListIndex()));
2381 enum FormatAttrKind {
2390 /// getFormatAttrKind - Map from format attribute names to supported format
2392 static FormatAttrKind getFormatAttrKind(StringRef Format) {
2393 return llvm::StringSwitch<FormatAttrKind>(Format)
2394 // Check for formats that get handled specially.
2395 .Case("NSString", NSStringFormat)
2396 .Case("CFString", CFStringFormat)
2397 .Case("strftime", StrftimeFormat)
2399 // Otherwise, check for supported formats.
2400 .Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
2401 .Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
2402 .Case("kprintf", SupportedFormat) // OpenBSD.
2404 .Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
2405 .Default(InvalidFormat);
2408 /// Handle __attribute__((init_priority(priority))) attributes based on
2409 /// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html
2410 static void handleInitPriorityAttr(Sema &S, Decl *D,
2411 const AttributeList &Attr) {
2412 if (!S.getLangOpts().CPlusPlus) {
2413 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
2417 if (S.getCurFunctionOrMethodDecl()) {
2418 S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
2422 QualType T = cast<VarDecl>(D)->getType();
2423 if (S.Context.getAsArrayType(T))
2424 T = S.Context.getBaseElementType(T);
2425 if (!T->getAs<RecordType>()) {
2426 S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
2431 Expr *E = Attr.getArgAsExpr(0);
2432 uint32_t prioritynum;
2433 if (!checkUInt32Argument(S, Attr, E, prioritynum)) {
2438 if (prioritynum < 101 || prioritynum > 65535) {
2439 S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range)
2440 << E->getSourceRange();
2444 D->addAttr(::new (S.Context)
2445 InitPriorityAttr(Attr.getRange(), S.Context, prioritynum,
2446 Attr.getAttributeSpellingListIndex()));
2449 FormatAttr *Sema::mergeFormatAttr(Decl *D, SourceRange Range,
2450 IdentifierInfo *Format, int FormatIdx,
2452 unsigned AttrSpellingListIndex) {
2453 // Check whether we already have an equivalent format attribute.
2454 for (auto *F : D->specific_attrs<FormatAttr>()) {
2455 if (F->getType() == Format &&
2456 F->getFormatIdx() == FormatIdx &&
2457 F->getFirstArg() == FirstArg) {
2458 // If we don't have a valid location for this attribute, adopt the
2460 if (F->getLocation().isInvalid())
2466 return ::new (Context) FormatAttr(Range, Context, Format, FormatIdx,
2467 FirstArg, AttrSpellingListIndex);
2470 /// Handle __attribute__((format(type,idx,firstarg))) attributes based on
2471 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
2472 static void handleFormatAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2473 if (!Attr.isArgIdent(0)) {
2474 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
2475 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
2479 // In C++ the implicit 'this' function parameter also counts, and they are
2480 // counted from one.
2481 bool HasImplicitThisParam = isInstanceMethod(D);
2482 unsigned NumArgs = getFunctionOrMethodNumParams(D) + HasImplicitThisParam;
2484 IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
2485 StringRef Format = II->getName();
2487 // Normalize the argument, __foo__ becomes foo.
2488 if (Format.startswith("__") && Format.endswith("__")) {
2489 Format = Format.substr(2, Format.size() - 4);
2490 // If we've modified the string name, we need a new identifier for it.
2491 II = &S.Context.Idents.get(Format);
2494 // Check for supported formats.
2495 FormatAttrKind Kind = getFormatAttrKind(Format);
2497 if (Kind == IgnoredFormat)
2500 if (Kind == InvalidFormat) {
2501 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
2502 << Attr.getName() << II->getName();
2506 // checks for the 2nd argument
2507 Expr *IdxExpr = Attr.getArgAsExpr(1);
2509 if (!checkUInt32Argument(S, Attr, IdxExpr, Idx, 2))
2512 if (Idx < 1 || Idx > NumArgs) {
2513 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
2514 << Attr.getName() << 2 << IdxExpr->getSourceRange();
2518 // FIXME: Do we need to bounds check?
2519 unsigned ArgIdx = Idx - 1;
2521 if (HasImplicitThisParam) {
2523 S.Diag(Attr.getLoc(),
2524 diag::err_format_attribute_implicit_this_format_string)
2525 << IdxExpr->getSourceRange();
2531 // make sure the format string is really a string
2532 QualType Ty = getFunctionOrMethodParamType(D, ArgIdx);
2534 if (Kind == CFStringFormat) {
2535 if (!isCFStringType(Ty, S.Context)) {
2536 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2537 << "a CFString" << IdxExpr->getSourceRange();
2540 } else if (Kind == NSStringFormat) {
2541 // FIXME: do we need to check if the type is NSString*? What are the
2543 if (!isNSStringType(Ty, S.Context)) {
2544 // FIXME: Should highlight the actual expression that has the wrong type.
2545 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2546 << "an NSString" << IdxExpr->getSourceRange();
2549 } else if (!Ty->isPointerType() ||
2550 !Ty->getAs<PointerType>()->getPointeeType()->isCharType()) {
2551 // FIXME: Should highlight the actual expression that has the wrong type.
2552 S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2553 << "a string type" << IdxExpr->getSourceRange();
2557 // check the 3rd argument
2558 Expr *FirstArgExpr = Attr.getArgAsExpr(2);
2560 if (!checkUInt32Argument(S, Attr, FirstArgExpr, FirstArg, 3))
2563 // check if the function is variadic if the 3rd argument non-zero
2564 if (FirstArg != 0) {
2565 if (isFunctionOrMethodVariadic(D)) {
2566 ++NumArgs; // +1 for ...
2568 S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic);
2573 // strftime requires FirstArg to be 0 because it doesn't read from any
2574 // variable the input is just the current time + the format string.
2575 if (Kind == StrftimeFormat) {
2576 if (FirstArg != 0) {
2577 S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter)
2578 << FirstArgExpr->getSourceRange();
2581 // if 0 it disables parameter checking (to use with e.g. va_list)
2582 } else if (FirstArg != 0 && FirstArg != NumArgs) {
2583 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
2584 << Attr.getName() << 3 << FirstArgExpr->getSourceRange();
2588 FormatAttr *NewAttr = S.mergeFormatAttr(D, Attr.getRange(), II,
2590 Attr.getAttributeSpellingListIndex());
2592 D->addAttr(NewAttr);
2595 static void handleTransparentUnionAttr(Sema &S, Decl *D,
2596 const AttributeList &Attr) {
2597 // Try to find the underlying union declaration.
2598 RecordDecl *RD = nullptr;
2599 TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
2600 if (TD && TD->getUnderlyingType()->isUnionType())
2601 RD = TD->getUnderlyingType()->getAsUnionType()->getDecl();
2603 RD = dyn_cast<RecordDecl>(D);
2605 if (!RD || !RD->isUnion()) {
2606 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2607 << Attr.getName() << ExpectedUnion;
2611 if (!RD->isCompleteDefinition()) {
2612 S.Diag(Attr.getLoc(),
2613 diag::warn_transparent_union_attribute_not_definition);
2617 RecordDecl::field_iterator Field = RD->field_begin(),
2618 FieldEnd = RD->field_end();
2619 if (Field == FieldEnd) {
2620 S.Diag(Attr.getLoc(), diag::warn_transparent_union_attribute_zero_fields);
2624 FieldDecl *FirstField = *Field;
2625 QualType FirstType = FirstField->getType();
2626 if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) {
2627 S.Diag(FirstField->getLocation(),
2628 diag::warn_transparent_union_attribute_floating)
2629 << FirstType->isVectorType() << FirstType;
2633 uint64_t FirstSize = S.Context.getTypeSize(FirstType);
2634 uint64_t FirstAlign = S.Context.getTypeAlign(FirstType);
2635 for (; Field != FieldEnd; ++Field) {
2636 QualType FieldType = Field->getType();
2637 // FIXME: this isn't fully correct; we also need to test whether the
2638 // members of the union would all have the same calling convention as the
2639 // first member of the union. Checking just the size and alignment isn't
2640 // sufficient (consider structs passed on the stack instead of in registers
2642 if (S.Context.getTypeSize(FieldType) != FirstSize ||
2643 S.Context.getTypeAlign(FieldType) > FirstAlign) {
2644 // Warn if we drop the attribute.
2645 bool isSize = S.Context.getTypeSize(FieldType) != FirstSize;
2646 unsigned FieldBits = isSize? S.Context.getTypeSize(FieldType)
2647 : S.Context.getTypeAlign(FieldType);
2648 S.Diag(Field->getLocation(),
2649 diag::warn_transparent_union_attribute_field_size_align)
2650 << isSize << Field->getDeclName() << FieldBits;
2651 unsigned FirstBits = isSize? FirstSize : FirstAlign;
2652 S.Diag(FirstField->getLocation(),
2653 diag::note_transparent_union_first_field_size_align)
2654 << isSize << FirstBits;
2659 RD->addAttr(::new (S.Context)
2660 TransparentUnionAttr(Attr.getRange(), S.Context,
2661 Attr.getAttributeSpellingListIndex()));
2664 static void handleAnnotateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2665 // Make sure that there is a string literal as the annotation's single
2668 if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
2671 // Don't duplicate annotations that are already set.
2672 for (const auto *I : D->specific_attrs<AnnotateAttr>()) {
2673 if (I->getAnnotation() == Str)
2677 D->addAttr(::new (S.Context)
2678 AnnotateAttr(Attr.getRange(), S.Context, Str,
2679 Attr.getAttributeSpellingListIndex()));
2682 static void handleAlignedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2683 // check the attribute arguments.
2684 if (Attr.getNumArgs() > 1) {
2685 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
2686 << Attr.getName() << 1;
2690 if (Attr.getNumArgs() == 0) {
2691 D->addAttr(::new (S.Context) AlignedAttr(Attr.getRange(), S.Context,
2692 true, nullptr, Attr.getAttributeSpellingListIndex()));
2696 Expr *E = Attr.getArgAsExpr(0);
2697 if (Attr.isPackExpansion() && !E->containsUnexpandedParameterPack()) {
2698 S.Diag(Attr.getEllipsisLoc(),
2699 diag::err_pack_expansion_without_parameter_packs);
2703 if (!Attr.isPackExpansion() && S.DiagnoseUnexpandedParameterPack(E))
2706 S.AddAlignedAttr(Attr.getRange(), D, E, Attr.getAttributeSpellingListIndex(),
2707 Attr.isPackExpansion());
2710 void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
2711 unsigned SpellingListIndex, bool IsPackExpansion) {
2712 AlignedAttr TmpAttr(AttrRange, Context, true, E, SpellingListIndex);
2713 SourceLocation AttrLoc = AttrRange.getBegin();
2715 // C++11 alignas(...) and C11 _Alignas(...) have additional requirements.
2716 if (TmpAttr.isAlignas()) {
2717 // C++11 [dcl.align]p1:
2718 // An alignment-specifier may be applied to a variable or to a class
2719 // data member, but it shall not be applied to a bit-field, a function
2720 // parameter, the formal parameter of a catch clause, or a variable
2721 // declared with the register storage class specifier. An
2722 // alignment-specifier may also be applied to the declaration of a class
2723 // or enumeration type.
2725 // An alignment attribute shall not be specified in a declaration of
2726 // a typedef, or a bit-field, or a function, or a parameter, or an
2727 // object declared with the register storage-class specifier.
2729 if (isa<ParmVarDecl>(D)) {
2731 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
2732 if (VD->getStorageClass() == SC_Register)
2734 if (VD->isExceptionVariable())
2736 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
2737 if (FD->isBitField())
2739 } else if (!isa<TagDecl>(D)) {
2740 Diag(AttrLoc, diag::err_attribute_wrong_decl_type) << &TmpAttr
2741 << (TmpAttr.isC11() ? ExpectedVariableOrField
2742 : ExpectedVariableFieldOrTag);
2745 if (DiagKind != -1) {
2746 Diag(AttrLoc, diag::err_alignas_attribute_wrong_decl_type)
2747 << &TmpAttr << DiagKind;
2752 if (E->isTypeDependent() || E->isValueDependent()) {
2753 // Save dependent expressions in the AST to be instantiated.
2754 AlignedAttr *AA = ::new (Context) AlignedAttr(TmpAttr);
2755 AA->setPackExpansion(IsPackExpansion);
2760 // FIXME: Cache the number on the Attr object?
2761 llvm::APSInt Alignment(32);
2763 = VerifyIntegerConstantExpression(E, &Alignment,
2764 diag::err_aligned_attribute_argument_not_int,
2765 /*AllowFold*/ false);
2766 if (ICE.isInvalid())
2769 // C++11 [dcl.align]p2:
2770 // -- if the constant expression evaluates to zero, the alignment
2771 // specifier shall have no effect
2773 // An alignment specification of zero has no effect.
2774 if (!(TmpAttr.isAlignas() && !Alignment) &&
2775 !llvm::isPowerOf2_64(Alignment.getZExtValue())) {
2776 Diag(AttrLoc, diag::err_attribute_aligned_not_power_of_two)
2777 << E->getSourceRange();
2781 // Alignment calculations can wrap around if it's greater than 2**28.
2782 unsigned MaxValidAlignment = TmpAttr.isDeclspec() ? 8192 : 268435456;
2783 if (Alignment.getZExtValue() > MaxValidAlignment) {
2784 Diag(AttrLoc, diag::err_attribute_aligned_too_great) << MaxValidAlignment
2785 << E->getSourceRange();
2789 AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, true,
2790 ICE.get(), SpellingListIndex);
2791 AA->setPackExpansion(IsPackExpansion);
2795 void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *TS,
2796 unsigned SpellingListIndex, bool IsPackExpansion) {
2797 // FIXME: Cache the number on the Attr object if non-dependent?
2798 // FIXME: Perform checking of type validity
2799 AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, false, TS,
2801 AA->setPackExpansion(IsPackExpansion);
2805 void Sema::CheckAlignasUnderalignment(Decl *D) {
2806 assert(D->hasAttrs() && "no attributes on decl");
2809 if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
2812 Ty = Context.getTagDeclType(cast<TagDecl>(D));
2813 if (Ty->isDependentType() || Ty->isIncompleteType())
2816 // C++11 [dcl.align]p5, C11 6.7.5/4:
2817 // The combined effect of all alignment attributes in a declaration shall
2818 // not specify an alignment that is less strict than the alignment that
2819 // would otherwise be required for the entity being declared.
2820 AlignedAttr *AlignasAttr = nullptr;
2822 for (auto *I : D->specific_attrs<AlignedAttr>()) {
2823 if (I->isAlignmentDependent())
2827 Align = std::max(Align, I->getAlignment(Context));
2830 if (AlignasAttr && Align) {
2831 CharUnits RequestedAlign = Context.toCharUnitsFromBits(Align);
2832 CharUnits NaturalAlign = Context.getTypeAlignInChars(Ty);
2833 if (NaturalAlign > RequestedAlign)
2834 Diag(AlignasAttr->getLocation(), diag::err_alignas_underaligned)
2835 << Ty << (unsigned)NaturalAlign.getQuantity();
2839 bool Sema::checkMSInheritanceAttrOnDefinition(
2840 CXXRecordDecl *RD, SourceRange Range, bool BestCase,
2841 MSInheritanceAttr::Spelling SemanticSpelling) {
2842 assert(RD->hasDefinition() && "RD has no definition!");
2844 // We may not have seen base specifiers or any virtual methods yet. We will
2845 // have to wait until the record is defined to catch any mismatches.
2846 if (!RD->getDefinition()->isCompleteDefinition())
2849 // The unspecified model never matches what a definition could need.
2850 if (SemanticSpelling == MSInheritanceAttr::Keyword_unspecified_inheritance)
2854 if (RD->calculateInheritanceModel() == SemanticSpelling)
2857 if (RD->calculateInheritanceModel() <= SemanticSpelling)
2861 Diag(Range.getBegin(), diag::err_mismatched_ms_inheritance)
2862 << 0 /*definition*/;
2863 Diag(RD->getDefinition()->getLocation(), diag::note_defined_here)
2864 << RD->getNameAsString();
2868 /// handleModeAttr - This attribute modifies the width of a decl with primitive
2871 /// Despite what would be logical, the mode attribute is a decl attribute, not a
2872 /// type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 'G' be
2873 /// HImode, not an intermediate pointer.
2874 static void handleModeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2875 // This attribute isn't documented, but glibc uses it. It changes
2876 // the width of an int or unsigned int to the specified size.
2877 if (!Attr.isArgIdent(0)) {
2878 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName()
2879 << AANT_ArgumentIdentifier;
2883 IdentifierInfo *Name = Attr.getArgAsIdent(0)->Ident;
2884 StringRef Str = Name->getName();
2886 // Normalize the attribute name, __foo__ becomes foo.
2887 if (Str.startswith("__") && Str.endswith("__"))
2888 Str = Str.substr(2, Str.size() - 4);
2890 unsigned DestWidth = 0;
2891 bool IntegerMode = true;
2892 bool ComplexMode = false;
2893 switch (Str.size()) {
2896 case 'Q': DestWidth = 8; break;
2897 case 'H': DestWidth = 16; break;
2898 case 'S': DestWidth = 32; break;
2899 case 'D': DestWidth = 64; break;
2900 case 'X': DestWidth = 96; break;
2901 case 'T': DestWidth = 128; break;
2903 if (Str[1] == 'F') {
2904 IntegerMode = false;
2905 } else if (Str[1] == 'C') {
2906 IntegerMode = false;
2908 } else if (Str[1] != 'I') {
2913 // FIXME: glibc uses 'word' to define register_t; this is narrower than a
2914 // pointer on PIC16 and other embedded platforms.
2916 DestWidth = S.Context.getTargetInfo().getPointerWidth(0);
2917 else if (Str == "byte")
2918 DestWidth = S.Context.getTargetInfo().getCharWidth();
2921 if (Str == "pointer")
2922 DestWidth = S.Context.getTargetInfo().getPointerWidth(0);
2925 if (Str == "unwind_word")
2926 DestWidth = S.Context.getTargetInfo().getUnwindWordWidth();
2931 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
2932 OldTy = TD->getUnderlyingType();
2933 else if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
2934 OldTy = VD->getType();
2936 S.Diag(D->getLocation(), diag::err_attr_wrong_decl)
2937 << Attr.getName() << Attr.getRange();
2941 if (!OldTy->getAs<BuiltinType>() && !OldTy->isComplexType())
2942 S.Diag(Attr.getLoc(), diag::err_mode_not_primitive);
2943 else if (IntegerMode) {
2944 if (!OldTy->isIntegralOrEnumerationType())
2945 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
2946 } else if (ComplexMode) {
2947 if (!OldTy->isComplexType())
2948 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
2950 if (!OldTy->isFloatingType())
2951 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
2954 // FIXME: Sync this with InitializePredefinedMacros; we need to match int8_t
2955 // and friends, at least with glibc.
2956 // FIXME: Make sure floating-point mappings are accurate
2957 // FIXME: Support XF and TF types
2959 S.Diag(Attr.getLoc(), diag::err_machine_mode) << 0 /*Unknown*/ << Name;
2966 NewTy = S.Context.getIntTypeForBitwidth(DestWidth,
2967 OldTy->isSignedIntegerType());
2969 NewTy = S.Context.getRealTypeForBitwidth(DestWidth);
2971 if (NewTy.isNull()) {
2972 S.Diag(Attr.getLoc(), diag::err_machine_mode) << 1 /*Unsupported*/ << Name;
2977 NewTy = S.Context.getComplexType(NewTy);
2980 // Install the new type.
2981 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
2982 TD->setModedTypeSourceInfo(TD->getTypeSourceInfo(), NewTy);
2984 cast<ValueDecl>(D)->setType(NewTy);
2986 D->addAttr(::new (S.Context)
2987 ModeAttr(Attr.getRange(), S.Context, Name,
2988 Attr.getAttributeSpellingListIndex()));
2991 static void handleNoDebugAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2992 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
2993 if (!VD->hasGlobalStorage())
2994 S.Diag(Attr.getLoc(),
2995 diag::warn_attribute_requires_functions_or_static_globals)
2997 } else if (!isFunctionOrMethod(D)) {
2998 S.Diag(Attr.getLoc(),
2999 diag::warn_attribute_requires_functions_or_static_globals)
3004 D->addAttr(::new (S.Context)
3005 NoDebugAttr(Attr.getRange(), S.Context,
3006 Attr.getAttributeSpellingListIndex()));
3009 static void handleAlwaysInlineAttr(Sema &S, Decl *D,
3010 const AttributeList &Attr) {
3011 if (checkAttrMutualExclusion<OptimizeNoneAttr>(S, D, Attr))
3014 D->addAttr(::new (S.Context)
3015 AlwaysInlineAttr(Attr.getRange(), S.Context,
3016 Attr.getAttributeSpellingListIndex()));
3019 static void handleOptimizeNoneAttr(Sema &S, Decl *D,
3020 const AttributeList &Attr) {
3021 if (checkAttrMutualExclusion<AlwaysInlineAttr>(S, D, Attr))
3024 D->addAttr(::new (S.Context)
3025 OptimizeNoneAttr(Attr.getRange(), S.Context,
3026 Attr.getAttributeSpellingListIndex()));
3029 static void handleGlobalAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3030 FunctionDecl *FD = cast<FunctionDecl>(D);
3031 if (!FD->getReturnType()->isVoidType()) {
3032 SourceRange RTRange = FD->getReturnTypeSourceRange();
3033 S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return)
3035 << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "void")
3040 D->addAttr(::new (S.Context)
3041 CUDAGlobalAttr(Attr.getRange(), S.Context,
3042 Attr.getAttributeSpellingListIndex()));
3045 static void handleGNUInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3046 FunctionDecl *Fn = cast<FunctionDecl>(D);
3047 if (!Fn->isInlineSpecified()) {
3048 S.Diag(Attr.getLoc(), diag::warn_gnu_inline_attribute_requires_inline);
3052 D->addAttr(::new (S.Context)
3053 GNUInlineAttr(Attr.getRange(), S.Context,
3054 Attr.getAttributeSpellingListIndex()));
3057 static void handleCallConvAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3058 if (hasDeclarator(D)) return;
3060 const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
3061 // Diagnostic is emitted elsewhere: here we store the (valid) Attr
3062 // in the Decl node for syntactic reasoning, e.g., pretty-printing.
3064 if (S.CheckCallingConvAttr(Attr, CC, FD))
3067 if (!isa<ObjCMethodDecl>(D)) {
3068 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
3069 << Attr.getName() << ExpectedFunctionOrMethod;
3073 switch (Attr.getKind()) {
3074 case AttributeList::AT_FastCall:
3075 D->addAttr(::new (S.Context)
3076 FastCallAttr(Attr.getRange(), S.Context,
3077 Attr.getAttributeSpellingListIndex()));
3079 case AttributeList::AT_StdCall:
3080 D->addAttr(::new (S.Context)
3081 StdCallAttr(Attr.getRange(), S.Context,
3082 Attr.getAttributeSpellingListIndex()));
3084 case AttributeList::AT_ThisCall:
3085 D->addAttr(::new (S.Context)
3086 ThisCallAttr(Attr.getRange(), S.Context,
3087 Attr.getAttributeSpellingListIndex()));
3089 case AttributeList::AT_CDecl:
3090 D->addAttr(::new (S.Context)
3091 CDeclAttr(Attr.getRange(), S.Context,
3092 Attr.getAttributeSpellingListIndex()));
3094 case AttributeList::AT_Pascal:
3095 D->addAttr(::new (S.Context)
3096 PascalAttr(Attr.getRange(), S.Context,
3097 Attr.getAttributeSpellingListIndex()));
3099 case AttributeList::AT_MSABI:
3100 D->addAttr(::new (S.Context)
3101 MSABIAttr(Attr.getRange(), S.Context,
3102 Attr.getAttributeSpellingListIndex()));
3104 case AttributeList::AT_SysVABI:
3105 D->addAttr(::new (S.Context)
3106 SysVABIAttr(Attr.getRange(), S.Context,
3107 Attr.getAttributeSpellingListIndex()));
3109 case AttributeList::AT_Pcs: {
3110 PcsAttr::PCSType PCS;
3113 PCS = PcsAttr::AAPCS;
3116 PCS = PcsAttr::AAPCS_VFP;
3119 llvm_unreachable("unexpected calling convention in pcs attribute");
3122 D->addAttr(::new (S.Context)
3123 PcsAttr(Attr.getRange(), S.Context, PCS,
3124 Attr.getAttributeSpellingListIndex()));
3127 case AttributeList::AT_PnaclCall:
3128 D->addAttr(::new (S.Context)
3129 PnaclCallAttr(Attr.getRange(), S.Context,
3130 Attr.getAttributeSpellingListIndex()));
3132 case AttributeList::AT_IntelOclBicc:
3133 D->addAttr(::new (S.Context)
3134 IntelOclBiccAttr(Attr.getRange(), S.Context,
3135 Attr.getAttributeSpellingListIndex()));
3139 llvm_unreachable("unexpected attribute kind");
3143 bool Sema::CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC,
3144 const FunctionDecl *FD) {
3145 if (attr.isInvalid())
3148 unsigned ReqArgs = attr.getKind() == AttributeList::AT_Pcs ? 1 : 0;
3149 if (!checkAttributeNumArgs(*this, attr, ReqArgs)) {
3154 // TODO: diagnose uses of these conventions on the wrong target.
3155 switch (attr.getKind()) {
3156 case AttributeList::AT_CDecl: CC = CC_C; break;
3157 case AttributeList::AT_FastCall: CC = CC_X86FastCall; break;
3158 case AttributeList::AT_StdCall: CC = CC_X86StdCall; break;
3159 case AttributeList::AT_ThisCall: CC = CC_X86ThisCall; break;
3160 case AttributeList::AT_Pascal: CC = CC_X86Pascal; break;
3161 case AttributeList::AT_MSABI:
3162 CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_C :
3165 case AttributeList::AT_SysVABI:
3166 CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_X86_64SysV :
3169 case AttributeList::AT_Pcs: {
3171 if (!checkStringLiteralArgumentAttr(attr, 0, StrRef)) {
3175 if (StrRef == "aapcs") {
3178 } else if (StrRef == "aapcs-vfp") {
3184 Diag(attr.getLoc(), diag::err_invalid_pcs);
3187 case AttributeList::AT_PnaclCall: CC = CC_PnaclCall; break;
3188 case AttributeList::AT_IntelOclBicc: CC = CC_IntelOclBicc; break;
3189 default: llvm_unreachable("unexpected attribute kind");
3192 const TargetInfo &TI = Context.getTargetInfo();
3193 TargetInfo::CallingConvCheckResult A = TI.checkCallingConvention(CC);
3194 if (A == TargetInfo::CCCR_Warning) {
3195 Diag(attr.getLoc(), diag::warn_cconv_ignored) << attr.getName();
3197 TargetInfo::CallingConvMethodType MT = TargetInfo::CCMT_Unknown;
3199 MT = FD->isCXXInstanceMember() ? TargetInfo::CCMT_Member :
3200 TargetInfo::CCMT_NonMember;
3201 CC = TI.getDefaultCallingConv(MT);
3207 /// Checks a regparm attribute, returning true if it is ill-formed and
3208 /// otherwise setting numParams to the appropriate value.
3209 bool Sema::CheckRegparmAttr(const AttributeList &Attr, unsigned &numParams) {
3210 if (Attr.isInvalid())
3213 if (!checkAttributeNumArgs(*this, Attr, 1)) {
3219 Expr *NumParamsExpr = Attr.getArgAsExpr(0);
3220 if (!checkUInt32Argument(*this, Attr, NumParamsExpr, NP)) {
3225 if (Context.getTargetInfo().getRegParmMax() == 0) {
3226 Diag(Attr.getLoc(), diag::err_attribute_regparm_wrong_platform)
3227 << NumParamsExpr->getSourceRange();
3233 if (numParams > Context.getTargetInfo().getRegParmMax()) {
3234 Diag(Attr.getLoc(), diag::err_attribute_regparm_invalid_number)
3235 << Context.getTargetInfo().getRegParmMax() << NumParamsExpr->getSourceRange();
3243 static void handleLaunchBoundsAttr(Sema &S, Decl *D,
3244 const AttributeList &Attr) {
3245 // check the attribute arguments.
3246 if (Attr.getNumArgs() != 1 && Attr.getNumArgs() != 2) {
3247 // FIXME: 0 is not okay.
3248 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
3249 << Attr.getName() << 2;
3253 uint32_t MaxThreads, MinBlocks = 0;
3254 if (!checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), MaxThreads, 1))
3256 if (Attr.getNumArgs() > 1 && !checkUInt32Argument(S, Attr,
3257 Attr.getArgAsExpr(1),
3261 D->addAttr(::new (S.Context)
3262 CUDALaunchBoundsAttr(Attr.getRange(), S.Context,
3263 MaxThreads, MinBlocks,
3264 Attr.getAttributeSpellingListIndex()));
3267 static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
3268 const AttributeList &Attr) {
3269 if (!Attr.isArgIdent(0)) {
3270 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
3271 << Attr.getName() << /* arg num = */ 1 << AANT_ArgumentIdentifier;
3275 if (!checkAttributeNumArgs(S, Attr, 3))
3278 IdentifierInfo *ArgumentKind = Attr.getArgAsIdent(0)->Ident;
3280 if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) {
3281 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
3282 << Attr.getName() << ExpectedFunctionOrMethod;
3286 uint64_t ArgumentIdx;
3287 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 2, Attr.getArgAsExpr(1),
3291 uint64_t TypeTagIdx;
3292 if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 3, Attr.getArgAsExpr(2),
3296 bool IsPointer = (Attr.getName()->getName() == "pointer_with_type_tag");
3298 // Ensure that buffer has a pointer type.
3299 QualType BufferTy = getFunctionOrMethodParamType(D, ArgumentIdx);
3300 if (!BufferTy->isPointerType()) {
3301 S.Diag(Attr.getLoc(), diag::err_attribute_pointers_only)
3306 D->addAttr(::new (S.Context)
3307 ArgumentWithTypeTagAttr(Attr.getRange(), S.Context, ArgumentKind,
3308 ArgumentIdx, TypeTagIdx, IsPointer,
3309 Attr.getAttributeSpellingListIndex()));
3312 static void handleTypeTagForDatatypeAttr(Sema &S, Decl *D,
3313 const AttributeList &Attr) {
3314 if (!Attr.isArgIdent(0)) {
3315 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
3316 << Attr.getName() << 1 << AANT_ArgumentIdentifier;
3320 if (!checkAttributeNumArgs(S, Attr, 1))
3323 if (!isa<VarDecl>(D)) {
3324 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
3325 << Attr.getName() << ExpectedVariable;
3329 IdentifierInfo *PointerKind = Attr.getArgAsIdent(0)->Ident;
3330 TypeSourceInfo *MatchingCTypeLoc = nullptr;
3331 S.GetTypeFromParser(Attr.getMatchingCType(), &MatchingCTypeLoc);
3332 assert(MatchingCTypeLoc && "no type source info for attribute argument");
3334 D->addAttr(::new (S.Context)
3335 TypeTagForDatatypeAttr(Attr.getRange(), S.Context, PointerKind,
3337 Attr.getLayoutCompatible(),
3338 Attr.getMustBeNull(),
3339 Attr.getAttributeSpellingListIndex()));
3342 //===----------------------------------------------------------------------===//
3343 // Checker-specific attribute handlers.
3344 //===----------------------------------------------------------------------===//
3346 static bool isValidSubjectOfNSReturnsRetainedAttribute(QualType type) {
3347 return type->isDependentType() ||
3348 type->isObjCRetainableType();
3351 static bool isValidSubjectOfNSAttribute(Sema &S, QualType type) {
3352 return type->isDependentType() ||
3353 type->isObjCObjectPointerType() ||
3354 S.Context.isObjCNSObjectType(type);
3356 static bool isValidSubjectOfCFAttribute(Sema &S, QualType type) {
3357 return type->isDependentType() ||
3358 type->isPointerType() ||
3359 isValidSubjectOfNSAttribute(S, type);
3362 static void handleNSConsumedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3363 ParmVarDecl *param = cast<ParmVarDecl>(D);
3366 if (Attr.getKind() == AttributeList::AT_NSConsumed) {
3367 typeOK = isValidSubjectOfNSAttribute(S, param->getType());
3370 typeOK = isValidSubjectOfCFAttribute(S, param->getType());
3375 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type)
3376 << Attr.getRange() << Attr.getName() << cf;
3381 param->addAttr(::new (S.Context)
3382 CFConsumedAttr(Attr.getRange(), S.Context,
3383 Attr.getAttributeSpellingListIndex()));
3385 param->addAttr(::new (S.Context)
3386 NSConsumedAttr(Attr.getRange(), S.Context,
3387 Attr.getAttributeSpellingListIndex()));
3390 static void handleNSReturnsRetainedAttr(Sema &S, Decl *D,
3391 const AttributeList &Attr) {
3393 QualType returnType;
3395 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
3396 returnType = MD->getReturnType();
3397 else if (S.getLangOpts().ObjCAutoRefCount && hasDeclarator(D) &&
3398 (Attr.getKind() == AttributeList::AT_NSReturnsRetained))
3399 return; // ignore: was handled as a type attribute
3400 else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D))
3401 returnType = PD->getType();
3402 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
3403 returnType = FD->getReturnType();
3405 S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type)
3406 << Attr.getRange() << Attr.getName()
3407 << ExpectedFunctionOrMethod;
3413 switch (Attr.getKind()) {
3414 default: llvm_unreachable("invalid ownership attribute");
3415 case AttributeList::AT_NSReturnsRetained:
3416 typeOK = isValidSubjectOfNSReturnsRetainedAttribute(returnType);
3420 case AttributeList::AT_NSReturnsAutoreleased:
3421 case AttributeList::AT_NSReturnsNotRetained:
3422 typeOK = isValidSubjectOfNSAttribute(S, returnType);
3426 case AttributeList::AT_CFReturnsRetained:
3427 case AttributeList::AT_CFReturnsNotRetained:
3428 typeOK = isValidSubjectOfCFAttribute(S, returnType);
3434 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
3435 << Attr.getRange() << Attr.getName() << isa<ObjCMethodDecl>(D) << cf;
3439 switch (Attr.getKind()) {
3441 llvm_unreachable("invalid ownership attribute");
3442 case AttributeList::AT_NSReturnsAutoreleased:
3443 D->addAttr(::new (S.Context)
3444 NSReturnsAutoreleasedAttr(Attr.getRange(), S.Context,
3445 Attr.getAttributeSpellingListIndex()));
3447 case AttributeList::AT_CFReturnsNotRetained:
3448 D->addAttr(::new (S.Context)
3449 CFReturnsNotRetainedAttr(Attr.getRange(), S.Context,
3450 Attr.getAttributeSpellingListIndex()));
3452 case AttributeList::AT_NSReturnsNotRetained:
3453 D->addAttr(::new (S.Context)
3454 NSReturnsNotRetainedAttr(Attr.getRange(), S.Context,
3455 Attr.getAttributeSpellingListIndex()));
3457 case AttributeList::AT_CFReturnsRetained:
3458 D->addAttr(::new (S.Context)
3459 CFReturnsRetainedAttr(Attr.getRange(), S.Context,
3460 Attr.getAttributeSpellingListIndex()));
3462 case AttributeList::AT_NSReturnsRetained:
3463 D->addAttr(::new (S.Context)
3464 NSReturnsRetainedAttr(Attr.getRange(), S.Context,
3465 Attr.getAttributeSpellingListIndex()));
3470 static void handleObjCReturnsInnerPointerAttr(Sema &S, Decl *D,
3471 const AttributeList &attr) {
3472 const int EP_ObjCMethod = 1;
3473 const int EP_ObjCProperty = 2;
3475 SourceLocation loc = attr.getLoc();
3476 QualType resultType;
3477 if (isa<ObjCMethodDecl>(D))
3478 resultType = cast<ObjCMethodDecl>(D)->getReturnType();
3480 resultType = cast<ObjCPropertyDecl>(D)->getType();
3482 if (!resultType->isReferenceType() &&
3483 (!resultType->isPointerType() || resultType->isObjCRetainableType())) {
3484 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
3487 << (isa<ObjCMethodDecl>(D) ? EP_ObjCMethod : EP_ObjCProperty)
3488 << /*non-retainable pointer*/ 2;
3490 // Drop the attribute.
3494 D->addAttr(::new (S.Context)
3495 ObjCReturnsInnerPointerAttr(attr.getRange(), S.Context,
3496 attr.getAttributeSpellingListIndex()));
3499 static void handleObjCRequiresSuperAttr(Sema &S, Decl *D,
3500 const AttributeList &attr) {
3501 ObjCMethodDecl *method = cast<ObjCMethodDecl>(D);
3503 DeclContext *DC = method->getDeclContext();
3504 if (const ObjCProtocolDecl *PDecl = dyn_cast_or_null<ObjCProtocolDecl>(DC)) {
3505 S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol)
3506 << attr.getName() << 0;
3507 S.Diag(PDecl->getLocation(), diag::note_protocol_decl);
3510 if (method->getMethodFamily() == OMF_dealloc) {
3511 S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol)
3512 << attr.getName() << 1;
3516 method->addAttr(::new (S.Context)
3517 ObjCRequiresSuperAttr(attr.getRange(), S.Context,
3518 attr.getAttributeSpellingListIndex()));
3521 static void handleCFAuditedTransferAttr(Sema &S, Decl *D,
3522 const AttributeList &Attr) {
3523 if (checkAttrMutualExclusion<CFUnknownTransferAttr>(S, D, Attr))
3526 D->addAttr(::new (S.Context)
3527 CFAuditedTransferAttr(Attr.getRange(), S.Context,
3528 Attr.getAttributeSpellingListIndex()));
3531 static void handleCFUnknownTransferAttr(Sema &S, Decl *D,
3532 const AttributeList &Attr) {
3533 if (checkAttrMutualExclusion<CFAuditedTransferAttr>(S, D, Attr))
3536 D->addAttr(::new (S.Context)
3537 CFUnknownTransferAttr(Attr.getRange(), S.Context,
3538 Attr.getAttributeSpellingListIndex()));
3541 static void handleObjCBridgeAttr(Sema &S, Scope *Sc, Decl *D,
3542 const AttributeList &Attr) {
3543 IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr;
3546 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
3550 D->addAttr(::new (S.Context)
3551 ObjCBridgeAttr(Attr.getRange(), S.Context, Parm->Ident,
3552 Attr.getAttributeSpellingListIndex()));
3555 static void handleObjCBridgeMutableAttr(Sema &S, Scope *Sc, Decl *D,
3556 const AttributeList &Attr) {
3557 IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr;
3560 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
3564 D->addAttr(::new (S.Context)
3565 ObjCBridgeMutableAttr(Attr.getRange(), S.Context, Parm->Ident,
3566 Attr.getAttributeSpellingListIndex()));
3569 static void handleObjCBridgeRelatedAttr(Sema &S, Scope *Sc, Decl *D,
3570 const AttributeList &Attr) {
3571 IdentifierInfo *RelatedClass =
3572 Attr.isArgIdent(0) ? Attr.getArgAsIdent(0)->Ident : nullptr;
3573 if (!RelatedClass) {
3574 S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
3577 IdentifierInfo *ClassMethod =
3578 Attr.getArgAsIdent(1) ? Attr.getArgAsIdent(1)->Ident : nullptr;
3579 IdentifierInfo *InstanceMethod =
3580 Attr.getArgAsIdent(2) ? Attr.getArgAsIdent(2)->Ident : nullptr;
3581 D->addAttr(::new (S.Context)
3582 ObjCBridgeRelatedAttr(Attr.getRange(), S.Context, RelatedClass,
3583 ClassMethod, InstanceMethod,
3584 Attr.getAttributeSpellingListIndex()));
3587 static void handleObjCDesignatedInitializer(Sema &S, Decl *D,
3588 const AttributeList &Attr) {
3589 ObjCInterfaceDecl *IFace;
3590 if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(D->getDeclContext()))
3591 IFace = CatDecl->getClassInterface();
3593 IFace = cast<ObjCInterfaceDecl>(D->getDeclContext());
3594 IFace->setHasDesignatedInitializers();
3595 D->addAttr(::new (S.Context)
3596 ObjCDesignatedInitializerAttr(Attr.getRange(), S.Context,
3597 Attr.getAttributeSpellingListIndex()));
3600 static void handleObjCRuntimeName(Sema &S, Decl *D,
3601 const AttributeList &Attr) {
3602 StringRef MetaDataName;
3603 if (!S.checkStringLiteralArgumentAttr(Attr, 0, MetaDataName))
3605 D->addAttr(::new (S.Context)
3606 ObjCRuntimeNameAttr(Attr.getRange(), S.Context,
3608 Attr.getAttributeSpellingListIndex()));
3611 static void handleObjCOwnershipAttr(Sema &S, Decl *D,
3612 const AttributeList &Attr) {
3613 if (hasDeclarator(D)) return;
3615 S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type)
3616 << Attr.getRange() << Attr.getName() << ExpectedVariable;
3619 static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D,
3620 const AttributeList &Attr) {
3621 ValueDecl *vd = cast<ValueDecl>(D);
3622 QualType type = vd->getType();
3624 if (!type->isDependentType() &&
3625 !type->isObjCLifetimeType()) {
3626 S.Diag(Attr.getLoc(), diag::err_objc_precise_lifetime_bad_type)
3631 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
3633 // If we have no lifetime yet, check the lifetime we're presumably
3635 if (lifetime == Qualifiers::OCL_None && !type->isDependentType())
3636 lifetime = type->getObjCARCImplicitLifetime();
3639 case Qualifiers::OCL_None:
3640 assert(type->isDependentType() &&
3641 "didn't infer lifetime for non-dependent type?");
3644 case Qualifiers::OCL_Weak: // meaningful
3645 case Qualifiers::OCL_Strong: // meaningful
3648 case Qualifiers::OCL_ExplicitNone:
3649 case Qualifiers::OCL_Autoreleasing:
3650 S.Diag(Attr.getLoc(), diag::warn_objc_precise_lifetime_meaningless)
3651 << (lifetime == Qualifiers::OCL_Autoreleasing);
3655 D->addAttr(::new (S.Context)
3656 ObjCPreciseLifetimeAttr(Attr.getRange(), S.Context,
3657 Attr.getAttributeSpellingListIndex()));
3660 //===----------------------------------------------------------------------===//
3661 // Microsoft specific attribute handlers.
3662 //===----------------------------------------------------------------------===//
3664 static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3665 if (!S.LangOpts.CPlusPlus) {
3666 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
3667 << Attr.getName() << AttributeLangSupport::C;
3671 if (!isa<CXXRecordDecl>(D)) {
3672 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
3673 << Attr.getName() << ExpectedClass;
3678 SourceLocation LiteralLoc;
3679 if (!S.checkStringLiteralArgumentAttr(Attr, 0, StrRef, &LiteralLoc))
3682 // GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or
3683 // "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}", normalize to the former.
3684 if (StrRef.size() == 38 && StrRef.front() == '{' && StrRef.back() == '}')
3685 StrRef = StrRef.drop_front().drop_back();
3687 // Validate GUID length.
3688 if (StrRef.size() != 36) {
3689 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
3693 for (unsigned i = 0; i < 36; ++i) {
3694 if (i == 8 || i == 13 || i == 18 || i == 23) {
3695 if (StrRef[i] != '-') {
3696 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
3699 } else if (!isHexDigit(StrRef[i])) {
3700 S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
3705 D->addAttr(::new (S.Context) UuidAttr(Attr.getRange(), S.Context, StrRef,
3706 Attr.getAttributeSpellingListIndex()));
3709 static void handleMSInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3710 if (!S.LangOpts.CPlusPlus) {
3711 S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
3712 << Attr.getName() << AttributeLangSupport::C;
3715 MSInheritanceAttr *IA = S.mergeMSInheritanceAttr(
3716 D, Attr.getRange(), /*BestCase=*/true,
3717 Attr.getAttributeSpellingListIndex(),
3718 (MSInheritanceAttr::Spelling)Attr.getSemanticSpelling());
3723 static void handleDeclspecThreadAttr(Sema &S, Decl *D,
3724 const AttributeList &Attr) {
3725 VarDecl *VD = cast<VarDecl>(D);
3726 if (!S.Context.getTargetInfo().isTLSSupported()) {
3727 S.Diag(Attr.getLoc(), diag::err_thread_unsupported);
3730 if (VD->getTSCSpec() != TSCS_unspecified) {
3731 S.Diag(Attr.getLoc(), diag::err_declspec_thread_on_thread_variable);
3734 if (VD->hasLocalStorage()) {
3735 S.Diag(Attr.getLoc(), diag::err_thread_non_global) << "__declspec(thread)";
3738 VD->addAttr(::new (S.Context) ThreadAttr(
3739 Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
3742 static void handleARMInterruptAttr(Sema &S, Decl *D,
3743 const AttributeList &Attr) {
3744 // Check the attribute arguments.
3745 if (Attr.getNumArgs() > 1) {
3746 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
3747 << Attr.getName() << 1;
3752 SourceLocation ArgLoc;
3754 if (Attr.getNumArgs() == 0)
3756 else if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &ArgLoc))
3759 ARMInterruptAttr::InterruptType Kind;
3760 if (!ARMInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
3761 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
3762 << Attr.getName() << Str << ArgLoc;
3766 unsigned Index = Attr.getAttributeSpellingListIndex();
3767 D->addAttr(::new (S.Context)
3768 ARMInterruptAttr(Attr.getLoc(), S.Context, Kind, Index));
3771 static void handleMSP430InterruptAttr(Sema &S, Decl *D,
3772 const AttributeList &Attr) {
3773 if (!checkAttributeNumArgs(S, Attr, 1))
3776 if (!Attr.isArgExpr(0)) {
3777 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName()
3778 << AANT_ArgumentIntegerConstant;
3782 // FIXME: Check for decl - it should be void ()(void).
3784 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
3785 llvm::APSInt NumParams(32);
3786 if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) {
3787 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
3788 << Attr.getName() << AANT_ArgumentIntegerConstant
3789 << NumParamsExpr->getSourceRange();
3793 unsigned Num = NumParams.getLimitedValue(255);
3794 if ((Num & 1) || Num > 30) {
3795 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
3796 << Attr.getName() << (int)NumParams.getSExtValue()
3797 << NumParamsExpr->getSourceRange();
3801 D->addAttr(::new (S.Context)
3802 MSP430InterruptAttr(Attr.getLoc(), S.Context, Num,
3803 Attr.getAttributeSpellingListIndex()));
3804 D->addAttr(UsedAttr::CreateImplicit(S.Context));
3807 static void handleInterruptAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3808 // Dispatch the interrupt attribute based on the current target.
3809 if (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::msp430)
3810 handleMSP430InterruptAttr(S, D, Attr);
3812 handleARMInterruptAttr(S, D, Attr);
3815 static void handleX86ForceAlignArgPointerAttr(Sema &S, Decl *D,
3816 const AttributeList& Attr) {
3817 // If we try to apply it to a function pointer, don't warn, but don't
3818 // do anything, either. It doesn't matter anyway, because there's nothing
3819 // special about calling a force_align_arg_pointer function.
3820 ValueDecl *VD = dyn_cast<ValueDecl>(D);
3821 if (VD && VD->getType()->isFunctionPointerType())
3823 // Also don't warn on function pointer typedefs.
3824 TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
3825 if (TD && (TD->getUnderlyingType()->isFunctionPointerType() ||
3826 TD->getUnderlyingType()->isFunctionType()))
3828 // Attribute can only be applied to function types.
3829 if (!isa<FunctionDecl>(D)) {
3830 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
3831 << Attr.getName() << /* function */0;
3835 D->addAttr(::new (S.Context)
3836 X86ForceAlignArgPointerAttr(Attr.getRange(), S.Context,
3837 Attr.getAttributeSpellingListIndex()));
3840 DLLImportAttr *Sema::mergeDLLImportAttr(Decl *D, SourceRange Range,
3841 unsigned AttrSpellingListIndex) {
3842 if (D->hasAttr<DLLExportAttr>()) {
3843 Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'dllimport'";
3847 if (D->hasAttr<DLLImportAttr>())
3850 return ::new (Context) DLLImportAttr(Range, Context, AttrSpellingListIndex);
3853 DLLExportAttr *Sema::mergeDLLExportAttr(Decl *D, SourceRange Range,
3854 unsigned AttrSpellingListIndex) {
3855 if (DLLImportAttr *Import = D->getAttr<DLLImportAttr>()) {
3856 Diag(Import->getLocation(), diag::warn_attribute_ignored) << Import;
3857 D->dropAttr<DLLImportAttr>();
3860 if (D->hasAttr<DLLExportAttr>())
3863 return ::new (Context) DLLExportAttr(Range, Context, AttrSpellingListIndex);
3866 static void handleDLLAttr(Sema &S, Decl *D, const AttributeList &A) {
3867 if (isa<ClassTemplatePartialSpecializationDecl>(D) &&
3868 S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
3869 S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored)
3874 unsigned Index = A.getAttributeSpellingListIndex();
3875 Attr *NewAttr = A.getKind() == AttributeList::AT_DLLExport
3876 ? (Attr *)S.mergeDLLExportAttr(D, A.getRange(), Index)
3877 : (Attr *)S.mergeDLLImportAttr(D, A.getRange(), Index);
3879 D->addAttr(NewAttr);
3883 Sema::mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
3884 unsigned AttrSpellingListIndex,
3885 MSInheritanceAttr::Spelling SemanticSpelling) {
3886 if (MSInheritanceAttr *IA = D->getAttr<MSInheritanceAttr>()) {
3887 if (IA->getSemanticSpelling() == SemanticSpelling)
3889 Diag(IA->getLocation(), diag::err_mismatched_ms_inheritance)
3890 << 1 /*previous declaration*/;
3891 Diag(Range.getBegin(), diag::note_previous_ms_inheritance);
3892 D->dropAttr<MSInheritanceAttr>();
3895 CXXRecordDecl *RD = cast<CXXRecordDecl>(D);
3896 if (RD->hasDefinition()) {
3897 if (checkMSInheritanceAttrOnDefinition(RD, Range, BestCase,
3898 SemanticSpelling)) {
3902 if (isa<ClassTemplatePartialSpecializationDecl>(RD)) {
3903 Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
3904 << 1 /*partial specialization*/;
3907 if (RD->getDescribedClassTemplate()) {
3908 Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
3909 << 0 /*primary template*/;
3914 return ::new (Context)
3915 MSInheritanceAttr(Range, Context, BestCase, AttrSpellingListIndex);
3918 static void handleCapabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3919 // The capability attributes take a single string parameter for the name of
3920 // the capability they represent. The lockable attribute does not take any
3921 // parameters. However, semantically, both attributes represent the same
3922 // concept, and so they use the same semantic attribute. Eventually, the
3923 // lockable attribute will be removed.
3925 // For backward compatibility, any capability which has no specified string
3926 // literal will be considered a "mutex."
3927 StringRef N("mutex");
3928 SourceLocation LiteralLoc;
3929 if (Attr.getKind() == AttributeList::AT_Capability &&
3930 !S.checkStringLiteralArgumentAttr(Attr, 0, N, &LiteralLoc))
3933 // Currently, there are only two names allowed for a capability: role and
3934 // mutex (case insensitive). Diagnose other capability names.
3935 if (!N.equals_lower("mutex") && !N.equals_lower("role"))
3936 S.Diag(LiteralLoc, diag::warn_invalid_capability_name) << N;
3938 D->addAttr(::new (S.Context) CapabilityAttr(Attr.getRange(), S.Context, N,
3939 Attr.getAttributeSpellingListIndex()));
3942 static void handleAssertCapabilityAttr(Sema &S, Decl *D,
3943 const AttributeList &Attr) {
3944 D->addAttr(::new (S.Context) AssertCapabilityAttr(Attr.getRange(), S.Context,
3945 Attr.getArgAsExpr(0),
3946 Attr.getAttributeSpellingListIndex()));
3949 static void handleAcquireCapabilityAttr(Sema &S, Decl *D,
3950 const AttributeList &Attr) {
3951 SmallVector<Expr*, 1> Args;
3952 if (!checkLockFunAttrCommon(S, D, Attr, Args))
3955 D->addAttr(::new (S.Context) AcquireCapabilityAttr(Attr.getRange(),
3957 Args.data(), Args.size(),
3958 Attr.getAttributeSpellingListIndex()));
3961 static void handleTryAcquireCapabilityAttr(Sema &S, Decl *D,
3962 const AttributeList &Attr) {
3963 SmallVector<Expr*, 2> Args;
3964 if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
3967 D->addAttr(::new (S.Context) TryAcquireCapabilityAttr(Attr.getRange(),
3969 Attr.getArgAsExpr(0),
3972 Attr.getAttributeSpellingListIndex()));
3975 static void handleReleaseCapabilityAttr(Sema &S, Decl *D,
3976 const AttributeList &Attr) {
3977 // Check that all arguments are lockable objects.
3978 SmallVector<Expr *, 1> Args;
3979 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, true);
3981 D->addAttr(::new (S.Context) ReleaseCapabilityAttr(
3982 Attr.getRange(), S.Context, Args.data(), Args.size(),
3983 Attr.getAttributeSpellingListIndex()));
3986 static void handleRequiresCapabilityAttr(Sema &S, Decl *D,
3987 const AttributeList &Attr) {
3988 if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
3991 // check that all arguments are lockable objects
3992 SmallVector<Expr*, 1> Args;
3993 checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
3997 RequiresCapabilityAttr *RCA = ::new (S.Context)
3998 RequiresCapabilityAttr(Attr.getRange(), S.Context, Args.data(),
3999 Args.size(), Attr.getAttributeSpellingListIndex());
4004 /// Handles semantic checking for features that are common to all attributes,
4005 /// such as checking whether a parameter was properly specified, or the correct
4006 /// number of arguments were passed, etc.
4007 static bool handleCommonAttributeFeatures(Sema &S, Scope *scope, Decl *D,
4008 const AttributeList &Attr) {
4009 // Several attributes carry different semantics than the parsing requires, so
4010 // those are opted out of the common handling.
4012 // We also bail on unknown and ignored attributes because those are handled
4013 // as part of the target-specific handling logic.
4014 if (Attr.hasCustomParsing() ||
4015 Attr.getKind() == AttributeList::UnknownAttribute)
4018 // Check whether the attribute requires specific language extensions to be
4020 if (!Attr.diagnoseLangOpts(S))
4023 // If there are no optional arguments, then checking for the argument count
4025 if (Attr.getMinArgs() == Attr.getMaxArgs() &&
4026 !checkAttributeNumArgs(S, Attr, Attr.getMinArgs()))
4029 // Check whether the attribute appertains to the given subject.
4030 if (!Attr.diagnoseAppertainsTo(S, D))
4036 //===----------------------------------------------------------------------===//
4037 // Top Level Sema Entry Points
4038 //===----------------------------------------------------------------------===//
4040 /// ProcessDeclAttribute - Apply the specific attribute to the specified decl if
4041 /// the attribute applies to decls. If the attribute is a type attribute, just
4042 /// silently ignore it if a GNU attribute.
4043 static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
4044 const AttributeList &Attr,
4045 bool IncludeCXX11Attributes) {
4046 if (Attr.isInvalid() || Attr.getKind() == AttributeList::IgnoredAttribute)
4049 // Ignore C++11 attributes on declarator chunks: they appertain to the type
4051 if (Attr.isCXX11Attribute() && !IncludeCXX11Attributes)
4054 // Unknown attributes are automatically warned on. Target-specific attributes
4055 // which do not apply to the current target architecture are treated as
4056 // though they were unknown attributes.
4057 if (Attr.getKind() == AttributeList::UnknownAttribute ||
4058 !Attr.existsInTarget(S.Context.getTargetInfo().getTriple())) {
4059 S.Diag(Attr.getLoc(), Attr.isDeclspecAttribute()
4060 ? diag::warn_unhandled_ms_attribute_ignored
4061 : diag::warn_unknown_attribute_ignored)
4066 if (handleCommonAttributeFeatures(S, scope, D, Attr))
4069 switch (Attr.getKind()) {
4071 // Type attributes are handled elsewhere; silently move on.
4072 assert(Attr.isTypeAttr() && "Non-type attribute not handled");
4074 case AttributeList::AT_Interrupt:
4075 handleInterruptAttr(S, D, Attr);
4077 case AttributeList::AT_X86ForceAlignArgPointer:
4078 handleX86ForceAlignArgPointerAttr(S, D, Attr);
4080 case AttributeList::AT_DLLExport:
4081 case AttributeList::AT_DLLImport:
4082 handleDLLAttr(S, D, Attr);
4084 case AttributeList::AT_Mips16:
4085 handleSimpleAttribute<Mips16Attr>(S, D, Attr);
4087 case AttributeList::AT_NoMips16:
4088 handleSimpleAttribute<NoMips16Attr>(S, D, Attr);
4090 case AttributeList::AT_IBAction:
4091 handleSimpleAttribute<IBActionAttr>(S, D, Attr);
4093 case AttributeList::AT_IBOutlet:
4094 handleIBOutlet(S, D, Attr);
4096 case AttributeList::AT_IBOutletCollection:
4097 handleIBOutletCollection(S, D, Attr);
4099 case AttributeList::AT_Alias:
4100 handleAliasAttr(S, D, Attr);
4102 case AttributeList::AT_Aligned:
4103 handleAlignedAttr(S, D, Attr);
4105 case AttributeList::AT_AlwaysInline:
4106 handleAlwaysInlineAttr(S, D, Attr);
4108 case AttributeList::AT_AnalyzerNoReturn:
4109 handleAnalyzerNoReturnAttr(S, D, Attr);
4111 case AttributeList::AT_TLSModel:
4112 handleTLSModelAttr(S, D, Attr);
4114 case AttributeList::AT_Annotate:
4115 handleAnnotateAttr(S, D, Attr);
4117 case AttributeList::AT_Availability:
4118 handleAvailabilityAttr(S, D, Attr);
4120 case AttributeList::AT_CarriesDependency:
4121 handleDependencyAttr(S, scope, D, Attr);
4123 case AttributeList::AT_Common:
4124 handleCommonAttr(S, D, Attr);
4126 case AttributeList::AT_CUDAConstant:
4127 handleSimpleAttribute<CUDAConstantAttr>(S, D, Attr);
4129 case AttributeList::AT_Constructor:
4130 handleConstructorAttr(S, D, Attr);
4132 case AttributeList::AT_CXX11NoReturn:
4133 handleSimpleAttribute<CXX11NoReturnAttr>(S, D, Attr);
4135 case AttributeList::AT_Deprecated:
4136 handleAttrWithMessage<DeprecatedAttr>(S, D, Attr);
4138 case AttributeList::AT_Destructor:
4139 handleDestructorAttr(S, D, Attr);
4141 case AttributeList::AT_EnableIf:
4142 handleEnableIfAttr(S, D, Attr);
4144 case AttributeList::AT_ExtVectorType:
4145 handleExtVectorTypeAttr(S, scope, D, Attr);
4147 case AttributeList::AT_MinSize:
4148 handleSimpleAttribute<MinSizeAttr>(S, D, Attr);
4150 case AttributeList::AT_OptimizeNone:
4151 handleOptimizeNoneAttr(S, D, Attr);
4153 case AttributeList::AT_Flatten:
4154 handleSimpleAttribute<FlattenAttr>(S, D, Attr);
4156 case AttributeList::AT_Format:
4157 handleFormatAttr(S, D, Attr);
4159 case AttributeList::AT_FormatArg:
4160 handleFormatArgAttr(S, D, Attr);
4162 case AttributeList::AT_CUDAGlobal:
4163 handleGlobalAttr(S, D, Attr);
4165 case AttributeList::AT_CUDADevice:
4166 handleSimpleAttribute<CUDADeviceAttr>(S, D, Attr);
4168 case AttributeList::AT_CUDAHost:
4169 handleSimpleAttribute<CUDAHostAttr>(S, D, Attr);
4171 case AttributeList::AT_GNUInline:
4172 handleGNUInlineAttr(S, D, Attr);
4174 case AttributeList::AT_CUDALaunchBounds:
4175 handleLaunchBoundsAttr(S, D, Attr);
4177 case AttributeList::AT_Malloc:
4178 handleMallocAttr(S, D, Attr);
4180 case AttributeList::AT_MayAlias:
4181 handleSimpleAttribute<MayAliasAttr>(S, D, Attr);
4183 case AttributeList::AT_Mode:
4184 handleModeAttr(S, D, Attr);
4186 case AttributeList::AT_NoCommon:
4187 handleSimpleAttribute<NoCommonAttr>(S, D, Attr);
4189 case AttributeList::AT_NoSplitStack:
4190 handleSimpleAttribute<NoSplitStackAttr>(S, D, Attr);
4192 case AttributeList::AT_NonNull:
4193 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(D))
4194 handleNonNullAttrParameter(S, PVD, Attr);
4196 handleNonNullAttr(S, D, Attr);
4198 case AttributeList::AT_ReturnsNonNull:
4199 handleReturnsNonNullAttr(S, D, Attr);
4201 case AttributeList::AT_Overloadable:
4202 handleSimpleAttribute<OverloadableAttr>(S, D, Attr);
4204 case AttributeList::AT_Ownership:
4205 handleOwnershipAttr(S, D, Attr);
4207 case AttributeList::AT_Cold:
4208 handleColdAttr(S, D, Attr);
4210 case AttributeList::AT_Hot:
4211 handleHotAttr(S, D, Attr);
4213 case AttributeList::AT_Naked:
4214 handleSimpleAttribute<NakedAttr>(S, D, Attr);
4216 case AttributeList::AT_NoReturn:
4217 handleNoReturnAttr(S, D, Attr);
4219 case AttributeList::AT_NoThrow:
4220 handleSimpleAttribute<NoThrowAttr>(S, D, Attr);
4222 case AttributeList::AT_CUDAShared:
4223 handleSimpleAttribute<CUDASharedAttr>(S, D, Attr);
4225 case AttributeList::AT_VecReturn:
4226 handleVecReturnAttr(S, D, Attr);
4229 case AttributeList::AT_ObjCOwnership:
4230 handleObjCOwnershipAttr(S, D, Attr);
4232 case AttributeList::AT_ObjCPreciseLifetime:
4233 handleObjCPreciseLifetimeAttr(S, D, Attr);
4236 case AttributeList::AT_ObjCReturnsInnerPointer:
4237 handleObjCReturnsInnerPointerAttr(S, D, Attr);
4240 case AttributeList::AT_ObjCRequiresSuper:
4241 handleObjCRequiresSuperAttr(S, D, Attr);
4244 case AttributeList::AT_ObjCBridge:
4245 handleObjCBridgeAttr(S, scope, D, Attr);
4248 case AttributeList::AT_ObjCBridgeMutable:
4249 handleObjCBridgeMutableAttr(S, scope, D, Attr);
4252 case AttributeList::AT_ObjCBridgeRelated:
4253 handleObjCBridgeRelatedAttr(S, scope, D, Attr);
4256 case AttributeList::AT_ObjCDesignatedInitializer:
4257 handleObjCDesignatedInitializer(S, D, Attr);
4260 case AttributeList::AT_ObjCRuntimeName:
4261 handleObjCRuntimeName(S, D, Attr);
4264 case AttributeList::AT_CFAuditedTransfer:
4265 handleCFAuditedTransferAttr(S, D, Attr);
4267 case AttributeList::AT_CFUnknownTransfer:
4268 handleCFUnknownTransferAttr(S, D, Attr);
4271 case AttributeList::AT_CFConsumed:
4272 case AttributeList::AT_NSConsumed:
4273 handleNSConsumedAttr(S, D, Attr);
4275 case AttributeList::AT_NSConsumesSelf:
4276 handleSimpleAttribute<NSConsumesSelfAttr>(S, D, Attr);
4279 case AttributeList::AT_NSReturnsAutoreleased:
4280 case AttributeList::AT_NSReturnsNotRetained:
4281 case AttributeList::AT_CFReturnsNotRetained:
4282 case AttributeList::AT_NSReturnsRetained:
4283 case AttributeList::AT_CFReturnsRetained:
4284 handleNSReturnsRetainedAttr(S, D, Attr);
4286 case AttributeList::AT_WorkGroupSizeHint:
4287 handleWorkGroupSize<WorkGroupSizeHintAttr>(S, D, Attr);
4289 case AttributeList::AT_ReqdWorkGroupSize:
4290 handleWorkGroupSize<ReqdWorkGroupSizeAttr>(S, D, Attr);
4292 case AttributeList::AT_VecTypeHint:
4293 handleVecTypeHint(S, D, Attr);
4296 case AttributeList::AT_InitPriority:
4297 handleInitPriorityAttr(S, D, Attr);
4300 case AttributeList::AT_Packed:
4301 handlePackedAttr(S, D, Attr);
4303 case AttributeList::AT_Section:
4304 handleSectionAttr(S, D, Attr);
4306 case AttributeList::AT_Unavailable:
4307 handleAttrWithMessage<UnavailableAttr>(S, D, Attr);
4309 case AttributeList::AT_ArcWeakrefUnavailable:
4310 handleSimpleAttribute<ArcWeakrefUnavailableAttr>(S, D, Attr);
4312 case AttributeList::AT_ObjCRootClass:
4313 handleSimpleAttribute<ObjCRootClassAttr>(S, D, Attr);
4315 case AttributeList::AT_ObjCExplicitProtocolImpl:
4316 handleObjCSuppresProtocolAttr(S, D, Attr);
4318 case AttributeList::AT_ObjCRequiresPropertyDefs:
4319 handleSimpleAttribute<ObjCRequiresPropertyDefsAttr>(S, D, Attr);
4321 case AttributeList::AT_Unused:
4322 handleSimpleAttribute<UnusedAttr>(S, D, Attr);
4324 case AttributeList::AT_ReturnsTwice:
4325 handleSimpleAttribute<ReturnsTwiceAttr>(S, D, Attr);
4327 case AttributeList::AT_Used:
4328 handleUsedAttr(S, D, Attr);
4330 case AttributeList::AT_Visibility:
4331 handleVisibilityAttr(S, D, Attr, false);
4333 case AttributeList::AT_TypeVisibility:
4334 handleVisibilityAttr(S, D, Attr, true);
4336 case AttributeList::AT_WarnUnused:
4337 handleSimpleAttribute<WarnUnusedAttr>(S, D, Attr);
4339 case AttributeList::AT_WarnUnusedResult:
4340 handleWarnUnusedResult(S, D, Attr);
4342 case AttributeList::AT_Weak:
4343 handleSimpleAttribute<WeakAttr>(S, D, Attr);
4345 case AttributeList::AT_WeakRef:
4346 handleWeakRefAttr(S, D, Attr);
4348 case AttributeList::AT_WeakImport:
4349 handleWeakImportAttr(S, D, Attr);
4351 case AttributeList::AT_TransparentUnion:
4352 handleTransparentUnionAttr(S, D, Attr);
4354 case AttributeList::AT_ObjCException:
4355 handleSimpleAttribute<ObjCExceptionAttr>(S, D, Attr);
4357 case AttributeList::AT_ObjCMethodFamily:
4358 handleObjCMethodFamilyAttr(S, D, Attr);
4360 case AttributeList::AT_ObjCNSObject:
4361 handleObjCNSObject(S, D, Attr);
4363 case AttributeList::AT_Blocks:
4364 handleBlocksAttr(S, D, Attr);
4366 case AttributeList::AT_Sentinel:
4367 handleSentinelAttr(S, D, Attr);
4369 case AttributeList::AT_Const:
4370 handleSimpleAttribute<ConstAttr>(S, D, Attr);
4372 case AttributeList::AT_Pure:
4373 handleSimpleAttribute<PureAttr>(S, D, Attr);
4375 case AttributeList::AT_Cleanup:
4376 handleCleanupAttr(S, D, Attr);
4378 case AttributeList::AT_NoDebug:
4379 handleNoDebugAttr(S, D, Attr);
4381 case AttributeList::AT_NoDuplicate:
4382 handleSimpleAttribute<NoDuplicateAttr>(S, D, Attr);
4384 case AttributeList::AT_NoInline:
4385 handleSimpleAttribute<NoInlineAttr>(S, D, Attr);
4387 case AttributeList::AT_NoInstrumentFunction: // Interacts with -pg.
4388 handleSimpleAttribute<NoInstrumentFunctionAttr>(S, D, Attr);
4390 case AttributeList::AT_StdCall:
4391 case AttributeList::AT_CDecl:
4392 case AttributeList::AT_FastCall:
4393 case AttributeList::AT_ThisCall:
4394 case AttributeList::AT_Pascal:
4395 case AttributeList::AT_MSABI:
4396 case AttributeList::AT_SysVABI:
4397 case AttributeList::AT_Pcs:
4398 case AttributeList::AT_PnaclCall:
4399 case AttributeList::AT_IntelOclBicc:
4400 handleCallConvAttr(S, D, Attr);
4402 case AttributeList::AT_OpenCLKernel:
4403 handleSimpleAttribute<OpenCLKernelAttr>(S, D, Attr);
4405 case AttributeList::AT_OpenCLImageAccess:
4406 handleSimpleAttribute<OpenCLImageAccessAttr>(S, D, Attr);
4409 // Microsoft attributes:
4410 case AttributeList::AT_MsStruct:
4411 handleSimpleAttribute<MsStructAttr>(S, D, Attr);
4413 case AttributeList::AT_Uuid:
4414 handleUuidAttr(S, D, Attr);
4416 case AttributeList::AT_MSInheritance:
4417 handleMSInheritanceAttr(S, D, Attr);
4419 case AttributeList::AT_SelectAny:
4420 handleSimpleAttribute<SelectAnyAttr>(S, D, Attr);
4422 case AttributeList::AT_Thread:
4423 handleDeclspecThreadAttr(S, D, Attr);
4426 // Thread safety attributes:
4427 case AttributeList::AT_AssertExclusiveLock:
4428 handleAssertExclusiveLockAttr(S, D, Attr);
4430 case AttributeList::AT_AssertSharedLock:
4431 handleAssertSharedLockAttr(S, D, Attr);
4433 case AttributeList::AT_GuardedVar:
4434 handleSimpleAttribute<GuardedVarAttr>(S, D, Attr);
4436 case AttributeList::AT_PtGuardedVar:
4437 handlePtGuardedVarAttr(S, D, Attr);
4439 case AttributeList::AT_ScopedLockable:
4440 handleSimpleAttribute<ScopedLockableAttr>(S, D, Attr);
4442 case AttributeList::AT_NoSanitizeAddress:
4443 handleSimpleAttribute<NoSanitizeAddressAttr>(S, D, Attr);
4445 case AttributeList::AT_NoThreadSafetyAnalysis:
4446 handleSimpleAttribute<NoThreadSafetyAnalysisAttr>(S, D, Attr);
4448 case AttributeList::AT_NoSanitizeThread:
4449 handleSimpleAttribute<NoSanitizeThreadAttr>(S, D, Attr);
4451 case AttributeList::AT_NoSanitizeMemory:
4452 handleSimpleAttribute<NoSanitizeMemoryAttr>(S, D, Attr);
4454 case AttributeList::AT_GuardedBy:
4455 handleGuardedByAttr(S, D, Attr);
4457 case AttributeList::AT_PtGuardedBy:
4458 handlePtGuardedByAttr(S, D, Attr);
4460 case AttributeList::AT_ExclusiveTrylockFunction:
4461 handleExclusiveTrylockFunctionAttr(S, D, Attr);
4463 case AttributeList::AT_LockReturned:
4464 handleLockReturnedAttr(S, D, Attr);
4466 case AttributeList::AT_LocksExcluded:
4467 handleLocksExcludedAttr(S, D, Attr);
4469 case AttributeList::AT_SharedTrylockFunction:
4470 handleSharedTrylockFunctionAttr(S, D, Attr);
4472 case AttributeList::AT_AcquiredBefore:
4473 handleAcquiredBeforeAttr(S, D, Attr);
4475 case AttributeList::AT_AcquiredAfter:
4476 handleAcquiredAfterAttr(S, D, Attr);
4479 // Capability analysis attributes.
4480 case AttributeList::AT_Capability:
4481 case AttributeList::AT_Lockable:
4482 handleCapabilityAttr(S, D, Attr);
4484 case AttributeList::AT_RequiresCapability:
4485 handleRequiresCapabilityAttr(S, D, Attr);
4488 case AttributeList::AT_AssertCapability:
4489 handleAssertCapabilityAttr(S, D, Attr);
4491 case AttributeList::AT_AcquireCapability:
4492 handleAcquireCapabilityAttr(S, D, Attr);
4494 case AttributeList::AT_ReleaseCapability:
4495 handleReleaseCapabilityAttr(S, D, Attr);
4497 case AttributeList::AT_TryAcquireCapability:
4498 handleTryAcquireCapabilityAttr(S, D, Attr);
4501 // Consumed analysis attributes.
4502 case AttributeList::AT_Consumable:
4503 handleConsumableAttr(S, D, Attr);
4505 case AttributeList::AT_ConsumableAutoCast:
4506 handleSimpleAttribute<ConsumableAutoCastAttr>(S, D, Attr);
4508 case AttributeList::AT_ConsumableSetOnRead:
4509 handleSimpleAttribute<ConsumableSetOnReadAttr>(S, D, Attr);
4511 case AttributeList::AT_CallableWhen:
4512 handleCallableWhenAttr(S, D, Attr);
4514 case AttributeList::AT_ParamTypestate:
4515 handleParamTypestateAttr(S, D, Attr);
4517 case AttributeList::AT_ReturnTypestate:
4518 handleReturnTypestateAttr(S, D, Attr);
4520 case AttributeList::AT_SetTypestate:
4521 handleSetTypestateAttr(S, D, Attr);
4523 case AttributeList::AT_TestTypestate:
4524 handleTestTypestateAttr(S, D, Attr);
4527 // Type safety attributes.
4528 case AttributeList::AT_ArgumentWithTypeTag:
4529 handleArgumentWithTypeTagAttr(S, D, Attr);
4531 case AttributeList::AT_TypeTagForDatatype:
4532 handleTypeTagForDatatypeAttr(S, D, Attr);
4537 /// ProcessDeclAttributeList - Apply all the decl attributes in the specified
4538 /// attribute list to the specified decl, ignoring any type attributes.
4539 void Sema::ProcessDeclAttributeList(Scope *S, Decl *D,
4540 const AttributeList *AttrList,
4541 bool IncludeCXX11Attributes) {
4542 for (const AttributeList* l = AttrList; l; l = l->getNext())
4543 ProcessDeclAttribute(*this, S, D, *l, IncludeCXX11Attributes);
4545 // FIXME: We should be able to handle these cases in TableGen.
4547 // static int a9 __attribute__((weakref));
4548 // but that looks really pointless. We reject it.
4549 if (D->hasAttr<WeakRefAttr>() && !D->hasAttr<AliasAttr>()) {
4550 Diag(AttrList->getLoc(), diag::err_attribute_weakref_without_alias)
4551 << cast<NamedDecl>(D);
4552 D->dropAttr<WeakRefAttr>();
4556 if (!D->hasAttr<OpenCLKernelAttr>()) {
4557 // These attributes cannot be applied to a non-kernel function.
4558 if (Attr *A = D->getAttr<ReqdWorkGroupSizeAttr>()) {
4559 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
4560 D->setInvalidDecl();
4562 if (Attr *A = D->getAttr<WorkGroupSizeHintAttr>()) {
4563 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
4564 D->setInvalidDecl();
4566 if (Attr *A = D->getAttr<VecTypeHintAttr>()) {
4567 Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
4568 D->setInvalidDecl();
4573 // Annotation attributes are the only attributes allowed after an access
4575 bool Sema::ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
4576 const AttributeList *AttrList) {
4577 for (const AttributeList* l = AttrList; l; l = l->getNext()) {
4578 if (l->getKind() == AttributeList::AT_Annotate) {
4579 handleAnnotateAttr(*this, ASDecl, *l);
4581 Diag(l->getLoc(), diag::err_only_annotate_after_access_spec);
4589 /// checkUnusedDeclAttributes - Check a list of attributes to see if it
4590 /// contains any decl attributes that we should warn about.
4591 static void checkUnusedDeclAttributes(Sema &S, const AttributeList *A) {
4592 for ( ; A; A = A->getNext()) {
4593 // Only warn if the attribute is an unignored, non-type attribute.
4594 if (A->isUsedAsTypeAttr() || A->isInvalid()) continue;
4595 if (A->getKind() == AttributeList::IgnoredAttribute) continue;
4597 if (A->getKind() == AttributeList::UnknownAttribute) {
4598 S.Diag(A->getLoc(), diag::warn_unknown_attribute_ignored)
4599 << A->getName() << A->getRange();
4601 S.Diag(A->getLoc(), diag::warn_attribute_not_on_decl)
4602 << A->getName() << A->getRange();
4607 /// checkUnusedDeclAttributes - Given a declarator which is not being
4608 /// used to build a declaration, complain about any decl attributes
4609 /// which might be lying around on it.
4610 void Sema::checkUnusedDeclAttributes(Declarator &D) {
4611 ::checkUnusedDeclAttributes(*this, D.getDeclSpec().getAttributes().getList());
4612 ::checkUnusedDeclAttributes(*this, D.getAttributes());
4613 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i)
4614 ::checkUnusedDeclAttributes(*this, D.getTypeObject(i).getAttrs());
4617 /// DeclClonePragmaWeak - clone existing decl (maybe definition),
4618 /// \#pragma weak needs a non-definition decl and source may not have one.
4619 NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
4620 SourceLocation Loc) {
4621 assert(isa<FunctionDecl>(ND) || isa<VarDecl>(ND));
4622 NamedDecl *NewD = nullptr;
4623 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
4624 FunctionDecl *NewFD;
4625 // FIXME: Missing call to CheckFunctionDeclaration().
4627 // FIXME: Is the qualifier info correct?
4628 // FIXME: Is the DeclContext correct?
4629 NewFD = FunctionDecl::Create(FD->getASTContext(), FD->getDeclContext(),
4630 Loc, Loc, DeclarationName(II),
4631 FD->getType(), FD->getTypeSourceInfo(),
4632 SC_None, false/*isInlineSpecified*/,
4634 false/*isConstexprSpecified*/);
4637 if (FD->getQualifier())
4638 NewFD->setQualifierInfo(FD->getQualifierLoc());
4640 // Fake up parameter variables; they are declared as if this were
4642 QualType FDTy = FD->getType();
4643 if (const FunctionProtoType *FT = FDTy->getAs<FunctionProtoType>()) {
4644 SmallVector<ParmVarDecl*, 16> Params;
4645 for (const auto &AI : FT->param_types()) {
4646 ParmVarDecl *Param = BuildParmVarDeclForTypedef(NewFD, Loc, AI);
4647 Param->setScopeInfo(0, Params.size());
4648 Params.push_back(Param);
4650 NewFD->setParams(Params);
4652 } else if (VarDecl *VD = dyn_cast<VarDecl>(ND)) {
4653 NewD = VarDecl::Create(VD->getASTContext(), VD->getDeclContext(),
4654 VD->getInnerLocStart(), VD->getLocation(), II,
4655 VD->getType(), VD->getTypeSourceInfo(),
4656 VD->getStorageClass());
4657 if (VD->getQualifier()) {
4658 VarDecl *NewVD = cast<VarDecl>(NewD);
4659 NewVD->setQualifierInfo(VD->getQualifierLoc());
4665 /// DeclApplyPragmaWeak - A declaration (maybe definition) needs \#pragma weak
4666 /// applied to it, possibly with an alias.
4667 void Sema::DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W) {
4668 if (W.getUsed()) return; // only do this once
4670 if (W.getAlias()) { // clone decl, impersonate __attribute(weak,alias(...))
4671 IdentifierInfo *NDId = ND->getIdentifier();
4672 NamedDecl *NewD = DeclClonePragmaWeak(ND, W.getAlias(), W.getLocation());
4673 NewD->addAttr(AliasAttr::CreateImplicit(Context, NDId->getName(),
4675 NewD->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
4676 WeakTopLevelDecl.push_back(NewD);
4677 // FIXME: "hideous" code from Sema::LazilyCreateBuiltin
4678 // to insert Decl at TU scope, sorry.
4679 DeclContext *SavedContext = CurContext;
4680 CurContext = Context.getTranslationUnitDecl();
4681 NewD->setDeclContext(CurContext);
4682 NewD->setLexicalDeclContext(CurContext);
4683 PushOnScopeChains(NewD, S);
4684 CurContext = SavedContext;
4685 } else { // just add weak to existing
4686 ND->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
4690 void Sema::ProcessPragmaWeak(Scope *S, Decl *D) {
4691 // It's valid to "forward-declare" #pragma weak, in which case we
4693 LoadExternalWeakUndeclaredIdentifiers();
4694 if (!WeakUndeclaredIdentifiers.empty()) {
4695 NamedDecl *ND = nullptr;
4696 if (VarDecl *VD = dyn_cast<VarDecl>(D))
4697 if (VD->isExternC())
4699 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
4700 if (FD->isExternC())
4703 if (IdentifierInfo *Id = ND->getIdentifier()) {
4704 llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator I
4705 = WeakUndeclaredIdentifiers.find(Id);
4706 if (I != WeakUndeclaredIdentifiers.end()) {
4707 WeakInfo W = I->second;
4708 DeclApplyPragmaWeak(S, ND, W);
4709 WeakUndeclaredIdentifiers[Id] = W;
4716 /// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in
4717 /// it, apply them to D. This is a bit tricky because PD can have attributes
4718 /// specified in many different places, and we need to find and apply them all.
4719 void Sema::ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD) {
4720 // Apply decl attributes from the DeclSpec if present.
4721 if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes().getList())
4722 ProcessDeclAttributeList(S, D, Attrs);
4724 // Walk the declarator structure, applying decl attributes that were in a type
4725 // position to the decl itself. This handles cases like:
4726 // int *__attr__(x)** D;
4727 // when X is a decl attribute.
4728 for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i)
4729 if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs())
4730 ProcessDeclAttributeList(S, D, Attrs, /*IncludeCXX11Attributes=*/false);
4732 // Finally, apply any attributes on the decl itself.
4733 if (const AttributeList *Attrs = PD.getAttributes())
4734 ProcessDeclAttributeList(S, D, Attrs);
4737 /// Is the given declaration allowed to use a forbidden type?
4738 static bool isForbiddenTypeAllowed(Sema &S, Decl *decl) {
4739 // Private ivars are always okay. Unfortunately, people don't
4740 // always properly make their ivars private, even in system headers.
4741 // Plus we need to make fields okay, too.
4742 // Function declarations in sys headers will be marked unavailable.
4743 if (!isa<FieldDecl>(decl) && !isa<ObjCPropertyDecl>(decl) &&
4744 !isa<FunctionDecl>(decl))
4747 // Require it to be declared in a system header.
4748 return S.Context.getSourceManager().isInSystemHeader(decl->getLocation());
4751 /// Handle a delayed forbidden-type diagnostic.
4752 static void handleDelayedForbiddenType(Sema &S, DelayedDiagnostic &diag,
4754 if (decl && isForbiddenTypeAllowed(S, decl)) {
4755 decl->addAttr(UnavailableAttr::CreateImplicit(S.Context,
4756 "this system declaration uses an unsupported type",
4760 if (S.getLangOpts().ObjCAutoRefCount)
4761 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(decl)) {
4762 // FIXME: we may want to suppress diagnostics for all
4763 // kind of forbidden type messages on unavailable functions.
4764 if (FD->hasAttr<UnavailableAttr>() &&
4765 diag.getForbiddenTypeDiagnostic() ==
4766 diag::err_arc_array_param_no_ownership) {
4767 diag.Triggered = true;
4772 S.Diag(diag.Loc, diag.getForbiddenTypeDiagnostic())
4773 << diag.getForbiddenTypeOperand() << diag.getForbiddenTypeArgument();
4774 diag.Triggered = true;
4777 void Sema::PopParsingDeclaration(ParsingDeclState state, Decl *decl) {
4778 assert(DelayedDiagnostics.getCurrentPool());
4779 DelayedDiagnosticPool &poppedPool = *DelayedDiagnostics.getCurrentPool();
4780 DelayedDiagnostics.popWithoutEmitting(state);
4782 // When delaying diagnostics to run in the context of a parsed
4783 // declaration, we only want to actually emit anything if parsing
4787 // We emit all the active diagnostics in this pool or any of its
4788 // parents. In general, we'll get one pool for the decl spec
4789 // and a child pool for each declarator; in a decl group like:
4790 // deprecated_typedef foo, *bar, baz();
4791 // only the declarator pops will be passed decls. This is correct;
4792 // we really do need to consider delayed diagnostics from the decl spec
4793 // for each of the different declarations.
4794 const DelayedDiagnosticPool *pool = &poppedPool;
4796 for (DelayedDiagnosticPool::pool_iterator
4797 i = pool->pool_begin(), e = pool->pool_end(); i != e; ++i) {
4798 // This const_cast is a bit lame. Really, Triggered should be mutable.
4799 DelayedDiagnostic &diag = const_cast<DelayedDiagnostic&>(*i);
4803 switch (diag.Kind) {
4804 case DelayedDiagnostic::Deprecation:
4805 case DelayedDiagnostic::Unavailable:
4806 // Don't bother giving deprecation/unavailable diagnostics if
4807 // the decl is invalid.
4808 if (!decl->isInvalidDecl())
4809 HandleDelayedAvailabilityCheck(diag, decl);
4812 case DelayedDiagnostic::Access:
4813 HandleDelayedAccessCheck(diag, decl);
4816 case DelayedDiagnostic::ForbiddenType:
4817 handleDelayedForbiddenType(*this, diag, decl);
4821 } while ((pool = pool->getParent()));
4824 /// Given a set of delayed diagnostics, re-emit them as if they had
4825 /// been delayed in the current context instead of in the given pool.
4826 /// Essentially, this just moves them to the current pool.
4827 void Sema::redelayDiagnostics(DelayedDiagnosticPool &pool) {
4828 DelayedDiagnosticPool *curPool = DelayedDiagnostics.getCurrentPool();
4829 assert(curPool && "re-emitting in undelayed context not supported");
4830 curPool->steal(pool);
4833 static bool isDeclDeprecated(Decl *D) {
4835 if (D->isDeprecated())
4837 // A category implicitly has the availability of the interface.
4838 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D))
4839 return CatD->getClassInterface()->isDeprecated();
4840 } while ((D = cast_or_null<Decl>(D->getDeclContext())));
4844 static bool isDeclUnavailable(Decl *D) {
4846 if (D->isUnavailable())
4848 // A category implicitly has the availability of the interface.
4849 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D))
4850 return CatD->getClassInterface()->isUnavailable();
4851 } while ((D = cast_or_null<Decl>(D->getDeclContext())));
4856 DoEmitAvailabilityWarning(Sema &S,
4857 DelayedDiagnostic::DDKind K,
4862 const ObjCInterfaceDecl *UnknownObjCClass,
4863 const ObjCPropertyDecl *ObjCProperty,
4864 bool ObjCPropertyAccess) {
4866 // Diagnostics for deprecated or unavailable.
4867 unsigned diag, diag_message, diag_fwdclass_message;
4869 // Matches 'diag::note_property_attribute' options.
4870 unsigned property_note_select;
4872 // Matches diag::note_availability_specified_here.
4873 unsigned available_here_select_kind;
4875 // Don't warn if our current context is deprecated or unavailable.
4877 case DelayedDiagnostic::Deprecation:
4878 if (isDeclDeprecated(Ctx))
4880 diag = !ObjCPropertyAccess ? diag::warn_deprecated
4881 : diag::warn_property_method_deprecated;
4882 diag_message = diag::warn_deprecated_message;
4883 diag_fwdclass_message = diag::warn_deprecated_fwdclass_message;
4884 property_note_select = /* deprecated */ 0;
4885 available_here_select_kind = /* deprecated */ 2;
4888 case DelayedDiagnostic::Unavailable:
4889 if (isDeclUnavailable(Ctx))
4891 diag = !ObjCPropertyAccess ? diag::err_unavailable
4892 : diag::err_property_method_unavailable;
4893 diag_message = diag::err_unavailable_message;
4894 diag_fwdclass_message = diag::warn_unavailable_fwdclass_message;
4895 property_note_select = /* unavailable */ 1;
4896 available_here_select_kind = /* unavailable */ 0;
4900 llvm_unreachable("Neither a deprecation or unavailable kind");
4903 DeclarationName Name = D->getDeclName();
4904 if (!Message.empty()) {
4905 S.Diag(Loc, diag_message) << Name << Message;
4907 S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute)
4908 << ObjCProperty->getDeclName() << property_note_select;
4909 } else if (!UnknownObjCClass) {
4910 S.Diag(Loc, diag) << Name;
4912 S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute)
4913 << ObjCProperty->getDeclName() << property_note_select;
4915 S.Diag(Loc, diag_fwdclass_message) << Name;
4916 S.Diag(UnknownObjCClass->getLocation(), diag::note_forward_class);
4919 S.Diag(D->getLocation(), diag::note_availability_specified_here)
4920 << D << available_here_select_kind;
4923 void Sema::HandleDelayedAvailabilityCheck(DelayedDiagnostic &DD,
4925 DD.Triggered = true;
4926 DoEmitAvailabilityWarning(*this,
4927 (DelayedDiagnostic::DDKind) DD.Kind,
4929 DD.getDeprecationDecl(),
4930 DD.getDeprecationMessage(),
4932 DD.getUnknownObjCClass(),
4933 DD.getObjCProperty(), false);
4936 void Sema::EmitAvailabilityWarning(AvailabilityDiagnostic AD,
4937 NamedDecl *D, StringRef Message,
4939 const ObjCInterfaceDecl *UnknownObjCClass,
4940 const ObjCPropertyDecl *ObjCProperty,
4941 bool ObjCPropertyAccess) {
4942 // Delay if we're currently parsing a declaration.
4943 if (DelayedDiagnostics.shouldDelayDiagnostics()) {
4944 DelayedDiagnostics.add(DelayedDiagnostic::makeAvailability(AD, Loc, D,
4948 ObjCPropertyAccess));
4952 Decl *Ctx = cast<Decl>(getCurLexicalContext());
4953 DelayedDiagnostic::DDKind K;
4955 case AD_Deprecation:
4956 K = DelayedDiagnostic::Deprecation;
4958 case AD_Unavailable:
4959 K = DelayedDiagnostic::Unavailable;
4963 DoEmitAvailabilityWarning(*this, K, Ctx, D, Message, Loc,
4964 UnknownObjCClass, ObjCProperty, ObjCPropertyAccess);