diff options
Diffstat (limited to 'contrib/llvm/tools/clang/lib/Sema/SemaDeclAttr.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/Sema/SemaDeclAttr.cpp | 4965 |
1 files changed, 4965 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/Sema/SemaDeclAttr.cpp b/contrib/llvm/tools/clang/lib/Sema/SemaDeclAttr.cpp new file mode 100644 index 0000000..61683cd --- /dev/null +++ b/contrib/llvm/tools/clang/lib/Sema/SemaDeclAttr.cpp @@ -0,0 +1,4965 @@ +//===--- SemaDeclAttr.cpp - Declaration Attribute Handling ----------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements decl-related attribute processing. +// +//===----------------------------------------------------------------------===// + +#include "clang/Sema/SemaInternal.h" +#include "clang/AST/ASTContext.h" +#include "clang/AST/CXXInheritance.h" +#include "clang/AST/DeclCXX.h" +#include "clang/AST/DeclObjC.h" +#include "clang/AST/DeclTemplate.h" +#include "clang/AST/Expr.h" +#include "clang/AST/ExprCXX.h" +#include "clang/AST/Mangle.h" +#include "clang/Basic/CharInfo.h" +#include "clang/Basic/SourceManager.h" +#include "clang/Basic/TargetInfo.h" +#include "clang/Lex/Preprocessor.h" +#include "clang/Sema/DeclSpec.h" +#include "clang/Sema/DelayedDiagnostic.h" +#include "clang/Sema/Lookup.h" +#include "clang/Sema/Scope.h" +#include "llvm/ADT/StringExtras.h" +using namespace clang; +using namespace sema; + +namespace AttributeLangSupport { + enum LANG { + C, + Cpp, + ObjC + }; +} + +//===----------------------------------------------------------------------===// +// Helper functions +//===----------------------------------------------------------------------===// + +/// isFunctionOrMethod - Return true if the given decl has function +/// type (function or function-typed variable) or an Objective-C +/// method. +static bool isFunctionOrMethod(const Decl *D) { + return (D->getFunctionType() != nullptr) || isa<ObjCMethodDecl>(D); +} + +/// Return true if the given decl has a declarator that should have +/// been processed by Sema::GetTypeForDeclarator. +static bool hasDeclarator(const Decl *D) { + // In some sense, TypedefDecl really *ought* to be a DeclaratorDecl. + return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) || + isa<ObjCPropertyDecl>(D); +} + +/// hasFunctionProto - Return true if the given decl has a argument +/// information. This decl should have already passed +/// isFunctionOrMethod or isFunctionOrMethodOrBlock. +static bool hasFunctionProto(const Decl *D) { + if (const FunctionType *FnTy = D->getFunctionType()) + return isa<FunctionProtoType>(FnTy); + return isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D); +} + +/// getFunctionOrMethodNumParams - Return number of function or method +/// parameters. It is an error to call this on a K&R function (use +/// hasFunctionProto first). +static unsigned getFunctionOrMethodNumParams(const Decl *D) { + if (const FunctionType *FnTy = D->getFunctionType()) + return cast<FunctionProtoType>(FnTy)->getNumParams(); + if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) + return BD->getNumParams(); + return cast<ObjCMethodDecl>(D)->param_size(); +} + +static QualType getFunctionOrMethodParamType(const Decl *D, unsigned Idx) { + if (const FunctionType *FnTy = D->getFunctionType()) + return cast<FunctionProtoType>(FnTy)->getParamType(Idx); + if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) + return BD->getParamDecl(Idx)->getType(); + + return cast<ObjCMethodDecl>(D)->parameters()[Idx]->getType(); +} + +static QualType getFunctionOrMethodResultType(const Decl *D) { + if (const FunctionType *FnTy = D->getFunctionType()) + return cast<FunctionType>(FnTy)->getReturnType(); + return cast<ObjCMethodDecl>(D)->getReturnType(); +} + +static bool isFunctionOrMethodVariadic(const Decl *D) { + if (const FunctionType *FnTy = D->getFunctionType()) { + const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy); + return proto->isVariadic(); + } else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) + return BD->isVariadic(); + else { + return cast<ObjCMethodDecl>(D)->isVariadic(); + } +} + +static bool isInstanceMethod(const Decl *D) { + if (const CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) + return MethodDecl->isInstance(); + return false; +} + +static inline bool isNSStringType(QualType T, ASTContext &Ctx) { + const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>(); + if (!PT) + return false; + + ObjCInterfaceDecl *Cls = PT->getObjectType()->getInterface(); + if (!Cls) + return false; + + IdentifierInfo* ClsName = Cls->getIdentifier(); + + // FIXME: Should we walk the chain of classes? + return ClsName == &Ctx.Idents.get("NSString") || + ClsName == &Ctx.Idents.get("NSMutableString"); +} + +static inline bool isCFStringType(QualType T, ASTContext &Ctx) { + const PointerType *PT = T->getAs<PointerType>(); + if (!PT) + return false; + + const RecordType *RT = PT->getPointeeType()->getAs<RecordType>(); + if (!RT) + return false; + + const RecordDecl *RD = RT->getDecl(); + if (RD->getTagKind() != TTK_Struct) + return false; + + return RD->getIdentifier() == &Ctx.Idents.get("__CFString"); +} + +static unsigned getNumAttributeArgs(const AttributeList &Attr) { + // FIXME: Include the type in the argument list. + return Attr.getNumArgs() + Attr.hasParsedType(); +} + +/// \brief Check if the attribute has exactly as many args as Num. May +/// output an error. +static bool checkAttributeNumArgs(Sema &S, const AttributeList &Attr, + unsigned Num) { + if (getNumAttributeArgs(Attr) != Num) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << Attr.getName() << Num; + return false; + } + + return true; +} + +/// \brief Check if the attribute has at least as many args as Num. May +/// output an error. +static bool checkAttributeAtLeastNumArgs(Sema &S, const AttributeList &Attr, + unsigned Num) { + if (getNumAttributeArgs(Attr) < Num) { + S.Diag(Attr.getLoc(), diag::err_attribute_too_few_arguments) + << Attr.getName() << Num; + return false; + } + + return true; +} + +/// \brief If Expr is a valid integer constant, get the value of the integer +/// expression and return success or failure. May output an error. +static bool checkUInt32Argument(Sema &S, const AttributeList &Attr, + const Expr *Expr, uint32_t &Val, + unsigned Idx = UINT_MAX) { + llvm::APSInt I(32); + if (Expr->isTypeDependent() || Expr->isValueDependent() || + !Expr->isIntegerConstantExpr(I, S.Context)) { + if (Idx != UINT_MAX) + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << Idx << AANT_ArgumentIntegerConstant + << Expr->getSourceRange(); + else + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentIntegerConstant + << Expr->getSourceRange(); + return false; + } + Val = (uint32_t)I.getZExtValue(); + return true; +} + +/// \brief Diagnose mutually exclusive attributes when present on a given +/// declaration. Returns true if diagnosed. +template <typename AttrTy> +static bool checkAttrMutualExclusion(Sema &S, Decl *D, + const AttributeList &Attr) { + if (AttrTy *A = D->getAttr<AttrTy>()) { + S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) + << Attr.getName() << A; + return true; + } + return false; +} + +/// \brief Check if IdxExpr is a valid parameter index for a function or +/// instance method D. May output an error. +/// +/// \returns true if IdxExpr is a valid index. +static bool checkFunctionOrMethodParameterIndex(Sema &S, const Decl *D, + const AttributeList &Attr, + unsigned AttrArgNum, + const Expr *IdxExpr, + uint64_t &Idx) { + assert(isFunctionOrMethod(D)); + + // In C++ the implicit 'this' function parameter also counts. + // Parameters are counted from one. + bool HP = hasFunctionProto(D); + bool HasImplicitThisParam = isInstanceMethod(D); + bool IV = HP && isFunctionOrMethodVariadic(D); + unsigned NumParams = + (HP ? getFunctionOrMethodNumParams(D) : 0) + HasImplicitThisParam; + + llvm::APSInt IdxInt; + if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() || + !IdxExpr->isIntegerConstantExpr(IdxInt, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << AttrArgNum << AANT_ArgumentIntegerConstant + << IdxExpr->getSourceRange(); + return false; + } + + Idx = IdxInt.getLimitedValue(); + if (Idx < 1 || (!IV && Idx > NumParams)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) + << Attr.getName() << AttrArgNum << IdxExpr->getSourceRange(); + return false; + } + Idx--; // Convert to zero-based. + if (HasImplicitThisParam) { + if (Idx == 0) { + S.Diag(Attr.getLoc(), + diag::err_attribute_invalid_implicit_this_argument) + << Attr.getName() << IdxExpr->getSourceRange(); + return false; + } + --Idx; + } + + return true; +} + +/// \brief Check if the argument \p ArgNum of \p Attr is a ASCII string literal. +/// If not emit an error and return false. If the argument is an identifier it +/// will emit an error with a fixit hint and treat it as if it was a string +/// literal. +bool Sema::checkStringLiteralArgumentAttr(const AttributeList &Attr, + unsigned ArgNum, StringRef &Str, + SourceLocation *ArgLocation) { + // Look for identifiers. If we have one emit a hint to fix it to a literal. + if (Attr.isArgIdent(ArgNum)) { + IdentifierLoc *Loc = Attr.getArgAsIdent(ArgNum); + Diag(Loc->Loc, diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentString + << FixItHint::CreateInsertion(Loc->Loc, "\"") + << FixItHint::CreateInsertion(PP.getLocForEndOfToken(Loc->Loc), "\""); + Str = Loc->Ident->getName(); + if (ArgLocation) + *ArgLocation = Loc->Loc; + return true; + } + + // Now check for an actual string literal. + Expr *ArgExpr = Attr.getArgAsExpr(ArgNum); + StringLiteral *Literal = dyn_cast<StringLiteral>(ArgExpr->IgnoreParenCasts()); + if (ArgLocation) + *ArgLocation = ArgExpr->getLocStart(); + + if (!Literal || !Literal->isAscii()) { + Diag(ArgExpr->getLocStart(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentString; + return false; + } + + Str = Literal->getString(); + return true; +} + +/// \brief Applies the given attribute to the Decl without performing any +/// additional semantic checking. +template <typename AttrType> +static void handleSimpleAttribute(Sema &S, Decl *D, + const AttributeList &Attr) { + D->addAttr(::new (S.Context) AttrType(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +/// \brief Check if the passed-in expression is of type int or bool. +static bool isIntOrBool(Expr *Exp) { + QualType QT = Exp->getType(); + return QT->isBooleanType() || QT->isIntegerType(); +} + + +// Check to see if the type is a smart pointer of some kind. We assume +// it's a smart pointer if it defines both operator-> and operator*. +static bool threadSafetyCheckIsSmartPointer(Sema &S, const RecordType* RT) { + DeclContextLookupConstResult Res1 = RT->getDecl()->lookup( + S.Context.DeclarationNames.getCXXOperatorName(OO_Star)); + if (Res1.empty()) + return false; + + DeclContextLookupConstResult Res2 = RT->getDecl()->lookup( + S.Context.DeclarationNames.getCXXOperatorName(OO_Arrow)); + if (Res2.empty()) + return false; + + return true; +} + +/// \brief Check if passed in Decl is a pointer type. +/// Note that this function may produce an error message. +/// \return true if the Decl is a pointer type; false otherwise +static bool threadSafetyCheckIsPointer(Sema &S, const Decl *D, + const AttributeList &Attr) { + const ValueDecl *vd = cast<ValueDecl>(D); + QualType QT = vd->getType(); + if (QT->isAnyPointerType()) + return true; + + if (const RecordType *RT = QT->getAs<RecordType>()) { + // If it's an incomplete type, it could be a smart pointer; skip it. + // (We don't want to force template instantiation if we can avoid it, + // since that would alter the order in which templates are instantiated.) + if (RT->isIncompleteType()) + return true; + + if (threadSafetyCheckIsSmartPointer(S, RT)) + return true; + } + + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_pointer) + << Attr.getName() << QT; + return false; +} + +/// \brief Checks that the passed in QualType either is of RecordType or points +/// to RecordType. Returns the relevant RecordType, null if it does not exit. +static const RecordType *getRecordType(QualType QT) { + if (const RecordType *RT = QT->getAs<RecordType>()) + return RT; + + // Now check if we point to record type. + if (const PointerType *PT = QT->getAs<PointerType>()) + return PT->getPointeeType()->getAs<RecordType>(); + + return nullptr; +} + +static bool checkRecordTypeForCapability(Sema &S, QualType Ty) { + const RecordType *RT = getRecordType(Ty); + + if (!RT) + return false; + + // Don't check for the capability if the class hasn't been defined yet. + if (RT->isIncompleteType()) + return true; + + // Allow smart pointers to be used as capability objects. + // FIXME -- Check the type that the smart pointer points to. + if (threadSafetyCheckIsSmartPointer(S, RT)) + return true; + + // Check if the record itself has a capability. + RecordDecl *RD = RT->getDecl(); + if (RD->hasAttr<CapabilityAttr>()) + return true; + + // Else check if any base classes have a capability. + if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { + CXXBasePaths BPaths(false, false); + if (CRD->lookupInBases([](const CXXBaseSpecifier *BS, CXXBasePath &P, + void *) { + return BS->getType()->getAs<RecordType>() + ->getDecl()->hasAttr<CapabilityAttr>(); + }, nullptr, BPaths)) + return true; + } + return false; +} + +static bool checkTypedefTypeForCapability(QualType Ty) { + const auto *TD = Ty->getAs<TypedefType>(); + if (!TD) + return false; + + TypedefNameDecl *TN = TD->getDecl(); + if (!TN) + return false; + + return TN->hasAttr<CapabilityAttr>(); +} + +static bool typeHasCapability(Sema &S, QualType Ty) { + if (checkTypedefTypeForCapability(Ty)) + return true; + + if (checkRecordTypeForCapability(S, Ty)) + return true; + + return false; +} + +static bool isCapabilityExpr(Sema &S, const Expr *Ex) { + // Capability expressions are simple expressions involving the boolean logic + // operators &&, || or !, a simple DeclRefExpr, CastExpr or a ParenExpr. Once + // a DeclRefExpr is found, its type should be checked to determine whether it + // is a capability or not. + + if (const auto *E = dyn_cast<DeclRefExpr>(Ex)) + return typeHasCapability(S, E->getType()); + else if (const auto *E = dyn_cast<CastExpr>(Ex)) + return isCapabilityExpr(S, E->getSubExpr()); + else if (const auto *E = dyn_cast<ParenExpr>(Ex)) + return isCapabilityExpr(S, E->getSubExpr()); + else if (const auto *E = dyn_cast<UnaryOperator>(Ex)) { + if (E->getOpcode() == UO_LNot) + return isCapabilityExpr(S, E->getSubExpr()); + return false; + } else if (const auto *E = dyn_cast<BinaryOperator>(Ex)) { + if (E->getOpcode() == BO_LAnd || E->getOpcode() == BO_LOr) + return isCapabilityExpr(S, E->getLHS()) && + isCapabilityExpr(S, E->getRHS()); + return false; + } + + return false; +} + +/// \brief Checks that all attribute arguments, starting from Sidx, resolve to +/// a capability object. +/// \param Sidx The attribute argument index to start checking with. +/// \param ParamIdxOk Whether an argument can be indexing into a function +/// parameter list. +static void checkAttrArgsAreCapabilityObjs(Sema &S, Decl *D, + const AttributeList &Attr, + SmallVectorImpl<Expr *> &Args, + int Sidx = 0, + bool ParamIdxOk = false) { + for (unsigned Idx = Sidx; Idx < Attr.getNumArgs(); ++Idx) { + Expr *ArgExp = Attr.getArgAsExpr(Idx); + + if (ArgExp->isTypeDependent()) { + // FIXME -- need to check this again on template instantiation + Args.push_back(ArgExp); + continue; + } + + if (StringLiteral *StrLit = dyn_cast<StringLiteral>(ArgExp)) { + if (StrLit->getLength() == 0 || + (StrLit->isAscii() && StrLit->getString() == StringRef("*"))) { + // Pass empty strings to the analyzer without warnings. + // Treat "*" as the universal lock. + Args.push_back(ArgExp); + continue; + } + + // We allow constant strings to be used as a placeholder for expressions + // that are not valid C++ syntax, but warn that they are ignored. + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_ignored) << + Attr.getName(); + Args.push_back(ArgExp); + continue; + } + + QualType ArgTy = ArgExp->getType(); + + // A pointer to member expression of the form &MyClass::mu is treated + // specially -- we need to look at the type of the member. + if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(ArgExp)) + if (UOp->getOpcode() == UO_AddrOf) + if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(UOp->getSubExpr())) + if (DRE->getDecl()->isCXXInstanceMember()) + ArgTy = DRE->getDecl()->getType(); + + // First see if we can just cast to record type, or pointer to record type. + const RecordType *RT = getRecordType(ArgTy); + + // Now check if we index into a record type function param. + if(!RT && ParamIdxOk) { + FunctionDecl *FD = dyn_cast<FunctionDecl>(D); + IntegerLiteral *IL = dyn_cast<IntegerLiteral>(ArgExp); + if(FD && IL) { + unsigned int NumParams = FD->getNumParams(); + llvm::APInt ArgValue = IL->getValue(); + uint64_t ParamIdxFromOne = ArgValue.getZExtValue(); + uint64_t ParamIdxFromZero = ParamIdxFromOne - 1; + if(!ArgValue.isStrictlyPositive() || ParamIdxFromOne > NumParams) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_range) + << Attr.getName() << Idx + 1 << NumParams; + continue; + } + ArgTy = FD->getParamDecl(ParamIdxFromZero)->getType(); + } + } + + // If the type does not have a capability, see if the components of the + // expression have capabilities. This allows for writing C code where the + // capability may be on the type, and the expression is a capability + // boolean logic expression. Eg) requires_capability(A || B && !C) + if (!typeHasCapability(S, ArgTy) && !isCapabilityExpr(S, ArgExp)) + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_argument_not_lockable) + << Attr.getName() << ArgTy; + + Args.push_back(ArgExp); + } +} + +//===----------------------------------------------------------------------===// +// Attribute Implementations +//===----------------------------------------------------------------------===// + +// FIXME: All this manual attribute parsing code is gross. At the +// least add some helper functions to check most argument patterns (# +// and types of args). + +static void handlePtGuardedVarAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!threadSafetyCheckIsPointer(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) + PtGuardedVarAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static bool checkGuardedByAttrCommon(Sema &S, Decl *D, + const AttributeList &Attr, + Expr* &Arg) { + SmallVector<Expr*, 1> Args; + // check that all arguments are lockable objects + checkAttrArgsAreCapabilityObjs(S, D, Attr, Args); + unsigned Size = Args.size(); + if (Size != 1) + return false; + + Arg = Args[0]; + + return true; +} + +static void handleGuardedByAttr(Sema &S, Decl *D, const AttributeList &Attr) { + Expr *Arg = nullptr; + if (!checkGuardedByAttrCommon(S, D, Attr, Arg)) + return; + + D->addAttr(::new (S.Context) GuardedByAttr(Attr.getRange(), S.Context, Arg, + Attr.getAttributeSpellingListIndex())); +} + +static void handlePtGuardedByAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + Expr *Arg = nullptr; + if (!checkGuardedByAttrCommon(S, D, Attr, Arg)) + return; + + if (!threadSafetyCheckIsPointer(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) PtGuardedByAttr(Attr.getRange(), + S.Context, Arg, + Attr.getAttributeSpellingListIndex())); +} + +static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D, + const AttributeList &Attr, + SmallVectorImpl<Expr *> &Args) { + if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) + return false; + + // Check that this attribute only applies to lockable types. + QualType QT = cast<ValueDecl>(D)->getType(); + if (!QT->isDependentType()) { + const RecordType *RT = getRecordType(QT); + if (!RT || !RT->getDecl()->hasAttr<CapabilityAttr>()) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_lockable) + << Attr.getName(); + return false; + } + } + + // Check that all arguments are lockable objects. + checkAttrArgsAreCapabilityObjs(S, D, Attr, Args); + if (Args.empty()) + return false; + + return true; +} + +static void handleAcquiredAfterAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 1> Args; + if (!checkAcquireOrderAttrCommon(S, D, Attr, Args)) + return; + + Expr **StartArg = &Args[0]; + D->addAttr(::new (S.Context) + AcquiredAfterAttr(Attr.getRange(), S.Context, + StartArg, Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleAcquiredBeforeAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 1> Args; + if (!checkAcquireOrderAttrCommon(S, D, Attr, Args)) + return; + + Expr **StartArg = &Args[0]; + D->addAttr(::new (S.Context) + AcquiredBeforeAttr(Attr.getRange(), S.Context, + StartArg, Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static bool checkLockFunAttrCommon(Sema &S, Decl *D, + const AttributeList &Attr, + SmallVectorImpl<Expr *> &Args) { + // zero or more arguments ok + // check that all arguments are lockable objects + checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true); + + return true; +} + +static void handleAssertSharedLockAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 1> Args; + if (!checkLockFunAttrCommon(S, D, Attr, Args)) + return; + + unsigned Size = Args.size(); + Expr **StartArg = Size == 0 ? nullptr : &Args[0]; + D->addAttr(::new (S.Context) + AssertSharedLockAttr(Attr.getRange(), S.Context, StartArg, Size, + Attr.getAttributeSpellingListIndex())); +} + +static void handleAssertExclusiveLockAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 1> Args; + if (!checkLockFunAttrCommon(S, D, Attr, Args)) + return; + + unsigned Size = Args.size(); + Expr **StartArg = Size == 0 ? nullptr : &Args[0]; + D->addAttr(::new (S.Context) + AssertExclusiveLockAttr(Attr.getRange(), S.Context, + StartArg, Size, + Attr.getAttributeSpellingListIndex())); +} + + +static bool checkTryLockFunAttrCommon(Sema &S, Decl *D, + const AttributeList &Attr, + SmallVectorImpl<Expr *> &Args) { + if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) + return false; + + if (!isIntOrBool(Attr.getArgAsExpr(0))) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 1 << AANT_ArgumentIntOrBool; + return false; + } + + // check that all arguments are lockable objects + checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 1); + + return true; +} + +static void handleSharedTrylockFunctionAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 2> Args; + if (!checkTryLockFunAttrCommon(S, D, Attr, Args)) + return; + + D->addAttr(::new (S.Context) + SharedTrylockFunctionAttr(Attr.getRange(), S.Context, + Attr.getArgAsExpr(0), + Args.data(), Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 2> Args; + if (!checkTryLockFunAttrCommon(S, D, Attr, Args)) + return; + + D->addAttr(::new (S.Context) + ExclusiveTrylockFunctionAttr(Attr.getRange(), S.Context, + Attr.getArgAsExpr(0), + Args.data(), Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleLockReturnedAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + // check that the argument is lockable object + SmallVector<Expr*, 1> Args; + checkAttrArgsAreCapabilityObjs(S, D, Attr, Args); + unsigned Size = Args.size(); + if (Size == 0) + return; + + D->addAttr(::new (S.Context) + LockReturnedAttr(Attr.getRange(), S.Context, Args[0], + Attr.getAttributeSpellingListIndex())); +} + +static void handleLocksExcludedAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) + return; + + // check that all arguments are lockable objects + SmallVector<Expr*, 1> Args; + checkAttrArgsAreCapabilityObjs(S, D, Attr, Args); + unsigned Size = Args.size(); + if (Size == 0) + return; + Expr **StartArg = &Args[0]; + + D->addAttr(::new (S.Context) + LocksExcludedAttr(Attr.getRange(), S.Context, StartArg, Size, + Attr.getAttributeSpellingListIndex())); +} + +static void handleEnableIfAttr(Sema &S, Decl *D, const AttributeList &Attr) { + Expr *Cond = Attr.getArgAsExpr(0); + if (!Cond->isTypeDependent()) { + ExprResult Converted = S.PerformContextuallyConvertToBool(Cond); + if (Converted.isInvalid()) + return; + Cond = Converted.get(); + } + + StringRef Msg; + if (!S.checkStringLiteralArgumentAttr(Attr, 1, Msg)) + return; + + SmallVector<PartialDiagnosticAt, 8> Diags; + if (!Cond->isValueDependent() && + !Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(D), + Diags)) { + S.Diag(Attr.getLoc(), diag::err_enable_if_never_constant_expr); + for (int I = 0, N = Diags.size(); I != N; ++I) + S.Diag(Diags[I].first, Diags[I].second); + return; + } + + D->addAttr(::new (S.Context) + EnableIfAttr(Attr.getRange(), S.Context, Cond, Msg, + Attr.getAttributeSpellingListIndex())); +} + +static void handleConsumableAttr(Sema &S, Decl *D, const AttributeList &Attr) { + ConsumableAttr::ConsumedState DefaultState; + + if (Attr.isArgIdent(0)) { + IdentifierLoc *IL = Attr.getArgAsIdent(0); + if (!ConsumableAttr::ConvertStrToConsumedState(IL->Ident->getName(), + DefaultState)) { + S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) + << Attr.getName() << IL->Ident; + return; + } + } else { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentIdentifier; + return; + } + + D->addAttr(::new (S.Context) + ConsumableAttr(Attr.getRange(), S.Context, DefaultState, + Attr.getAttributeSpellingListIndex())); +} + + +static bool checkForConsumableClass(Sema &S, const CXXMethodDecl *MD, + const AttributeList &Attr) { + ASTContext &CurrContext = S.getASTContext(); + QualType ThisType = MD->getThisType(CurrContext)->getPointeeType(); + + if (const CXXRecordDecl *RD = ThisType->getAsCXXRecordDecl()) { + if (!RD->hasAttr<ConsumableAttr>()) { + S.Diag(Attr.getLoc(), diag::warn_attr_on_unconsumable_class) << + RD->getNameAsString(); + + return false; + } + } + + return true; +} + + +static void handleCallableWhenAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) + return; + + if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr)) + return; + + SmallVector<CallableWhenAttr::ConsumedState, 3> States; + for (unsigned ArgIndex = 0; ArgIndex < Attr.getNumArgs(); ++ArgIndex) { + CallableWhenAttr::ConsumedState CallableState; + + StringRef StateString; + SourceLocation Loc; + if (!S.checkStringLiteralArgumentAttr(Attr, ArgIndex, StateString, &Loc)) + return; + + if (!CallableWhenAttr::ConvertStrToConsumedState(StateString, + CallableState)) { + S.Diag(Loc, diag::warn_attribute_type_not_supported) + << Attr.getName() << StateString; + return; + } + + States.push_back(CallableState); + } + + D->addAttr(::new (S.Context) + CallableWhenAttr(Attr.getRange(), S.Context, States.data(), + States.size(), Attr.getAttributeSpellingListIndex())); +} + + +static void handleParamTypestateAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkAttributeNumArgs(S, Attr, 1)) return; + + ParamTypestateAttr::ConsumedState ParamState; + + if (Attr.isArgIdent(0)) { + IdentifierLoc *Ident = Attr.getArgAsIdent(0); + StringRef StateString = Ident->Ident->getName(); + + if (!ParamTypestateAttr::ConvertStrToConsumedState(StateString, + ParamState)) { + S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported) + << Attr.getName() << StateString; + return; + } + } else { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << + Attr.getName() << AANT_ArgumentIdentifier; + return; + } + + // FIXME: This check is currently being done in the analysis. It can be + // enabled here only after the parser propagates attributes at + // template specialization definition, not declaration. + //QualType ReturnType = cast<ParmVarDecl>(D)->getType(); + //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl(); + // + //if (!RD || !RD->hasAttr<ConsumableAttr>()) { + // S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) << + // ReturnType.getAsString(); + // return; + //} + + D->addAttr(::new (S.Context) + ParamTypestateAttr(Attr.getRange(), S.Context, ParamState, + Attr.getAttributeSpellingListIndex())); +} + + +static void handleReturnTypestateAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkAttributeNumArgs(S, Attr, 1)) return; + + ReturnTypestateAttr::ConsumedState ReturnState; + + if (Attr.isArgIdent(0)) { + IdentifierLoc *IL = Attr.getArgAsIdent(0); + if (!ReturnTypestateAttr::ConvertStrToConsumedState(IL->Ident->getName(), + ReturnState)) { + S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) + << Attr.getName() << IL->Ident; + return; + } + } else { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << + Attr.getName() << AANT_ArgumentIdentifier; + return; + } + + // FIXME: This check is currently being done in the analysis. It can be + // enabled here only after the parser propagates attributes at + // template specialization definition, not declaration. + //QualType ReturnType; + // + //if (const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D)) { + // ReturnType = Param->getType(); + // + //} else if (const CXXConstructorDecl *Constructor = + // dyn_cast<CXXConstructorDecl>(D)) { + // ReturnType = Constructor->getThisType(S.getASTContext())->getPointeeType(); + // + //} else { + // + // ReturnType = cast<FunctionDecl>(D)->getCallResultType(); + //} + // + //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl(); + // + //if (!RD || !RD->hasAttr<ConsumableAttr>()) { + // S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) << + // ReturnType.getAsString(); + // return; + //} + + D->addAttr(::new (S.Context) + ReturnTypestateAttr(Attr.getRange(), S.Context, ReturnState, + Attr.getAttributeSpellingListIndex())); +} + + +static void handleSetTypestateAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkAttributeNumArgs(S, Attr, 1)) + return; + + if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr)) + return; + + SetTypestateAttr::ConsumedState NewState; + if (Attr.isArgIdent(0)) { + IdentifierLoc *Ident = Attr.getArgAsIdent(0); + StringRef Param = Ident->Ident->getName(); + if (!SetTypestateAttr::ConvertStrToConsumedState(Param, NewState)) { + S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported) + << Attr.getName() << Param; + return; + } + } else { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << + Attr.getName() << AANT_ArgumentIdentifier; + return; + } + + D->addAttr(::new (S.Context) + SetTypestateAttr(Attr.getRange(), S.Context, NewState, + Attr.getAttributeSpellingListIndex())); +} + +static void handleTestTypestateAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkAttributeNumArgs(S, Attr, 1)) + return; + + if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr)) + return; + + TestTypestateAttr::ConsumedState TestState; + if (Attr.isArgIdent(0)) { + IdentifierLoc *Ident = Attr.getArgAsIdent(0); + StringRef Param = Ident->Ident->getName(); + if (!TestTypestateAttr::ConvertStrToConsumedState(Param, TestState)) { + S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported) + << Attr.getName() << Param; + return; + } + } else { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << + Attr.getName() << AANT_ArgumentIdentifier; + return; + } + + D->addAttr(::new (S.Context) + TestTypestateAttr(Attr.getRange(), S.Context, TestState, + Attr.getAttributeSpellingListIndex())); +} + +static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D, + const AttributeList &Attr) { + // Remember this typedef decl, we will need it later for diagnostics. + S.ExtVectorDecls.push_back(cast<TypedefNameDecl>(D)); +} + +static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (TagDecl *TD = dyn_cast<TagDecl>(D)) + TD->addAttr(::new (S.Context) PackedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { + // If the alignment is less than or equal to 8 bits, the packed attribute + // has no effect. + if (!FD->getType()->isDependentType() && + !FD->getType()->isIncompleteType() && + S.Context.getTypeAlign(FD->getType()) <= 8) + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored_for_field_of_type) + << Attr.getName() << FD->getType(); + else + FD->addAttr(::new (S.Context) + PackedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + } else + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); +} + +static bool checkIBOutletCommon(Sema &S, Decl *D, const AttributeList &Attr) { + // The IBOutlet/IBOutletCollection attributes only apply to instance + // variables or properties of Objective-C classes. The outlet must also + // have an object reference type. + if (const ObjCIvarDecl *VD = dyn_cast<ObjCIvarDecl>(D)) { + if (!VD->getType()->getAs<ObjCObjectPointerType>()) { + S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type) + << Attr.getName() << VD->getType() << 0; + return false; + } + } + else if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) { + if (!PD->getType()->getAs<ObjCObjectPointerType>()) { + S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type) + << Attr.getName() << PD->getType() << 1; + return false; + } + } + else { + S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName(); + return false; + } + + return true; +} + +static void handleIBOutlet(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkIBOutletCommon(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) + IBOutletAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleIBOutletCollection(Sema &S, Decl *D, + const AttributeList &Attr) { + + // The iboutletcollection attribute can have zero or one arguments. + if (Attr.getNumArgs() > 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << Attr.getName() << 1; + return; + } + + if (!checkIBOutletCommon(S, D, Attr)) + return; + + ParsedType PT; + + if (Attr.hasParsedType()) + PT = Attr.getTypeArg(); + else { + PT = S.getTypeName(S.Context.Idents.get("NSObject"), Attr.getLoc(), + S.getScopeForContext(D->getDeclContext()->getParent())); + if (!PT) { + S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << "NSObject"; + return; + } + } + + TypeSourceInfo *QTLoc = nullptr; + QualType QT = S.GetTypeFromParser(PT, &QTLoc); + if (!QTLoc) + QTLoc = S.Context.getTrivialTypeSourceInfo(QT, Attr.getLoc()); + + // Diagnose use of non-object type in iboutletcollection attribute. + // FIXME. Gnu attribute extension ignores use of builtin types in + // attributes. So, __attribute__((iboutletcollection(char))) will be + // treated as __attribute__((iboutletcollection())). + if (!QT->isObjCIdType() && !QT->isObjCObjectType()) { + S.Diag(Attr.getLoc(), + QT->isBuiltinType() ? diag::err_iboutletcollection_builtintype + : diag::err_iboutletcollection_type) << QT; + return; + } + + D->addAttr(::new (S.Context) + IBOutletCollectionAttr(Attr.getRange(), S.Context, QTLoc, + Attr.getAttributeSpellingListIndex())); +} + +static void possibleTransparentUnionPointerType(QualType &T) { + if (const RecordType *UT = T->getAsUnionType()) + if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) { + RecordDecl *UD = UT->getDecl(); + for (const auto *I : UD->fields()) { + QualType QT = I->getType(); + if (QT->isAnyPointerType() || QT->isBlockPointerType()) { + T = QT; + return; + } + } + } +} + +static bool attrNonNullArgCheck(Sema &S, QualType T, const AttributeList &Attr, + SourceRange R, bool isReturnValue = false) { + T = T.getNonReferenceType(); + possibleTransparentUnionPointerType(T); + + if (!T->isAnyPointerType() && !T->isBlockPointerType()) { + S.Diag(Attr.getLoc(), + isReturnValue ? diag::warn_attribute_return_pointers_only + : diag::warn_attribute_pointers_only) + << Attr.getName() << R; + return false; + } + return true; +} + +static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) { + SmallVector<unsigned, 8> NonNullArgs; + for (unsigned i = 0; i < Attr.getNumArgs(); ++i) { + Expr *Ex = Attr.getArgAsExpr(i); + uint64_t Idx; + if (!checkFunctionOrMethodParameterIndex(S, D, Attr, i + 1, Ex, Idx)) + return; + + // Is the function argument a pointer type? + // FIXME: Should also highlight argument in decl in the diagnostic. + if (!attrNonNullArgCheck(S, getFunctionOrMethodParamType(D, Idx), Attr, + Ex->getSourceRange())) + continue; + + NonNullArgs.push_back(Idx); + } + + // If no arguments were specified to __attribute__((nonnull)) then all pointer + // arguments have a nonnull attribute. + if (NonNullArgs.empty()) { + for (unsigned i = 0, e = getFunctionOrMethodNumParams(D); i != e; ++i) { + QualType T = getFunctionOrMethodParamType(D, i).getNonReferenceType(); + possibleTransparentUnionPointerType(T); + if (T->isAnyPointerType() || T->isBlockPointerType()) + NonNullArgs.push_back(i); + } + + // No pointer arguments? + if (NonNullArgs.empty()) { + // Warn the trivial case only if attribute is not coming from a + // macro instantiation. + if (Attr.getLoc().isFileID()) + S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers); + return; + } + } + + unsigned *start = &NonNullArgs[0]; + unsigned size = NonNullArgs.size(); + llvm::array_pod_sort(start, start + size); + D->addAttr(::new (S.Context) + NonNullAttr(Attr.getRange(), S.Context, start, size, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D, + const AttributeList &Attr) { + if (Attr.getNumArgs() > 0) { + if (D->getFunctionType()) { + handleNonNullAttr(S, D, Attr); + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_parm_no_args) + << D->getSourceRange(); + } + return; + } + + // Is the argument a pointer type? + if (!attrNonNullArgCheck(S, D->getType(), Attr, D->getSourceRange())) + return; + + D->addAttr(::new (S.Context) + NonNullAttr(Attr.getRange(), S.Context, nullptr, 0, + Attr.getAttributeSpellingListIndex())); +} + +static void handleReturnsNonNullAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + QualType ResultType = getFunctionOrMethodResultType(D); + if (!attrNonNullArgCheck(S, ResultType, Attr, Attr.getRange(), + /* isReturnValue */ true)) + return; + + D->addAttr(::new (S.Context) + ReturnsNonNullAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) { + // This attribute must be applied to a function declaration. The first + // argument to the attribute must be an identifier, the name of the resource, + // for example: malloc. The following arguments must be argument indexes, the + // arguments must be of integer type for Returns, otherwise of pointer type. + // The difference between Holds and Takes is that a pointer may still be used + // after being held. free() should be __attribute((ownership_takes)), whereas + // a list append function may well be __attribute((ownership_holds)). + + if (!AL.isArgIdent(0)) { + S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type) + << AL.getName() << 1 << AANT_ArgumentIdentifier; + return; + } + + // Figure out our Kind. + OwnershipAttr::OwnershipKind K = + OwnershipAttr(AL.getLoc(), S.Context, nullptr, nullptr, 0, + AL.getAttributeSpellingListIndex()).getOwnKind(); + + // Check arguments. + switch (K) { + case OwnershipAttr::Takes: + case OwnershipAttr::Holds: + if (AL.getNumArgs() < 2) { + S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments) + << AL.getName() << 2; + return; + } + break; + case OwnershipAttr::Returns: + if (AL.getNumArgs() > 2) { + S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments) + << AL.getName() << 1; + return; + } + break; + } + + IdentifierInfo *Module = AL.getArgAsIdent(0)->Ident; + + // Normalize the argument, __foo__ becomes foo. + StringRef ModuleName = Module->getName(); + if (ModuleName.startswith("__") && ModuleName.endswith("__") && + ModuleName.size() > 4) { + ModuleName = ModuleName.drop_front(2).drop_back(2); + Module = &S.PP.getIdentifierTable().get(ModuleName); + } + + SmallVector<unsigned, 8> OwnershipArgs; + for (unsigned i = 1; i < AL.getNumArgs(); ++i) { + Expr *Ex = AL.getArgAsExpr(i); + uint64_t Idx; + if (!checkFunctionOrMethodParameterIndex(S, D, AL, i, Ex, Idx)) + return; + + // Is the function argument a pointer type? + QualType T = getFunctionOrMethodParamType(D, Idx); + int Err = -1; // No error + switch (K) { + case OwnershipAttr::Takes: + case OwnershipAttr::Holds: + if (!T->isAnyPointerType() && !T->isBlockPointerType()) + Err = 0; + break; + case OwnershipAttr::Returns: + if (!T->isIntegerType()) + Err = 1; + break; + } + if (-1 != Err) { + S.Diag(AL.getLoc(), diag::err_ownership_type) << AL.getName() << Err + << Ex->getSourceRange(); + return; + } + + // Check we don't have a conflict with another ownership attribute. + for (const auto *I : D->specific_attrs<OwnershipAttr>()) { + // FIXME: A returns attribute should conflict with any returns attribute + // with a different index too. + if (I->getOwnKind() != K && I->args_end() != + std::find(I->args_begin(), I->args_end(), Idx)) { + S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible) + << AL.getName() << I; + return; + } + } + OwnershipArgs.push_back(Idx); + } + + unsigned* start = OwnershipArgs.data(); + unsigned size = OwnershipArgs.size(); + llvm::array_pod_sort(start, start + size); + + D->addAttr(::new (S.Context) + OwnershipAttr(AL.getLoc(), S.Context, Module, start, size, + AL.getAttributeSpellingListIndex())); +} + +static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // Check the attribute arguments. + if (Attr.getNumArgs() > 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << Attr.getName() << 1; + return; + } + + NamedDecl *nd = cast<NamedDecl>(D); + + // gcc rejects + // class c { + // static int a __attribute__((weakref ("v2"))); + // static int b() __attribute__((weakref ("f3"))); + // }; + // and ignores the attributes of + // void f(void) { + // static int a __attribute__((weakref ("v2"))); + // } + // we reject them + const DeclContext *Ctx = D->getDeclContext()->getRedeclContext(); + if (!Ctx->isFileContext()) { + S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_global_context) + << nd; + return; + } + + // The GCC manual says + // + // At present, a declaration to which `weakref' is attached can only + // be `static'. + // + // It also says + // + // Without a TARGET, + // given as an argument to `weakref' or to `alias', `weakref' is + // equivalent to `weak'. + // + // gcc 4.4.1 will accept + // int a7 __attribute__((weakref)); + // as + // int a7 __attribute__((weak)); + // This looks like a bug in gcc. We reject that for now. We should revisit + // it if this behaviour is actually used. + + // GCC rejects + // static ((alias ("y"), weakref)). + // Should we? How to check that weakref is before or after alias? + + // FIXME: it would be good for us to keep the WeakRefAttr as-written instead + // of transforming it into an AliasAttr. The WeakRefAttr never uses the + // StringRef parameter it was given anyway. + StringRef Str; + if (Attr.getNumArgs() && S.checkStringLiteralArgumentAttr(Attr, 0, Str)) + // GCC will accept anything as the argument of weakref. Should we + // check for an existing decl? + D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str, + Attr.getAttributeSpellingListIndex())); + + D->addAttr(::new (S.Context) + WeakRefAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) { + StringRef Str; + if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str)) + return; + + if (S.Context.getTargetInfo().getTriple().isOSDarwin()) { + S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_darwin); + return; + } + + // FIXME: check if target symbol exists in current file + + D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str, + Attr.getAttributeSpellingListIndex())); +} + +static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (checkAttrMutualExclusion<HotAttr>(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) ColdAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (checkAttrMutualExclusion<ColdAttr>(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) HotAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleTLSModelAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + StringRef Model; + SourceLocation LiteralLoc; + // Check that it is a string. + if (!S.checkStringLiteralArgumentAttr(Attr, 0, Model, &LiteralLoc)) + return; + + // Check that the value. + if (Model != "global-dynamic" && Model != "local-dynamic" + && Model != "initial-exec" && Model != "local-exec") { + S.Diag(LiteralLoc, diag::err_attr_tlsmodel_arg); + return; + } + + D->addAttr(::new (S.Context) + TLSModelAttr(Attr.getRange(), S.Context, Model, + Attr.getAttributeSpellingListIndex())); +} + +static void handleMallocAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { + QualType RetTy = FD->getReturnType(); + if (RetTy->isAnyPointerType() || RetTy->isBlockPointerType()) { + D->addAttr(::new (S.Context) + MallocAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + } + } + + S.Diag(Attr.getLoc(), diag::warn_attribute_malloc_pointer_only); +} + +static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (S.LangOpts.CPlusPlus) { + S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang) + << Attr.getName() << AttributeLangSupport::Cpp; + return; + } + + D->addAttr(::new (S.Context) CommonAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &attr) { + if (hasDeclarator(D)) return; + + if (S.CheckNoReturnAttr(attr)) return; + + if (!isa<ObjCMethodDecl>(D)) { + S.Diag(attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << attr.getName() << ExpectedFunctionOrMethod; + return; + } + + D->addAttr(::new (S.Context) + NoReturnAttr(attr.getRange(), S.Context, + attr.getAttributeSpellingListIndex())); +} + +bool Sema::CheckNoReturnAttr(const AttributeList &attr) { + if (!checkAttributeNumArgs(*this, attr, 0)) { + attr.setInvalid(); + return true; + } + + return false; +} + +static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + + // The checking path for 'noreturn' and 'analyzer_noreturn' are different + // because 'analyzer_noreturn' does not impact the type. + if (!isFunctionOrMethod(D) && !isa<BlockDecl>(D)) { + ValueDecl *VD = dyn_cast<ValueDecl>(D); + if (!VD || (!VD->getType()->isBlockPointerType() && + !VD->getType()->isFunctionPointerType())) { + S.Diag(Attr.getLoc(), + Attr.isCXX11Attribute() ? diag::err_attribute_wrong_decl_type + : diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionMethodOrBlock; + return; + } + } + + D->addAttr(::new (S.Context) + AnalyzerNoReturnAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +// PS3 PPU-specific. +static void handleVecReturnAttr(Sema &S, Decl *D, const AttributeList &Attr) { +/* + Returning a Vector Class in Registers + + According to the PPU ABI specifications, a class with a single member of + vector type is returned in memory when used as the return value of a function. + This results in inefficient code when implementing vector classes. To return + the value in a single vector register, add the vecreturn attribute to the + class definition. This attribute is also applicable to struct types. + + Example: + + struct Vector + { + __vector float xyzw; + } __attribute__((vecreturn)); + + Vector Add(Vector lhs, Vector rhs) + { + Vector result; + result.xyzw = vec_add(lhs.xyzw, rhs.xyzw); + return result; // This will be returned in a register + } +*/ + if (VecReturnAttr *A = D->getAttr<VecReturnAttr>()) { + S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << A; + return; + } + + RecordDecl *record = cast<RecordDecl>(D); + int count = 0; + + if (!isa<CXXRecordDecl>(record)) { + S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member); + return; + } + + if (!cast<CXXRecordDecl>(record)->isPOD()) { + S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_pod_record); + return; + } + + for (const auto *I : record->fields()) { + if ((count == 1) || !I->getType()->isVectorType()) { + S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member); + return; + } + count++; + } + + D->addAttr(::new (S.Context) + VecReturnAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleDependencyAttr(Sema &S, Scope *Scope, Decl *D, + const AttributeList &Attr) { + if (isa<ParmVarDecl>(D)) { + // [[carries_dependency]] can only be applied to a parameter if it is a + // parameter of a function declaration or lambda. + if (!(Scope->getFlags() & clang::Scope::FunctionDeclarationScope)) { + S.Diag(Attr.getLoc(), + diag::err_carries_dependency_param_not_function_decl); + return; + } + } + + D->addAttr(::new (S.Context) CarriesDependencyAttr( + Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { + if (VD->hasLocalStorage()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); + return; + } + } else if (!isFunctionOrMethod(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariableOrFunction; + return; + } + + D->addAttr(::new (S.Context) + UsedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // check the attribute arguments. + if (Attr.getNumArgs() > 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) + << Attr.getName() << 1; + return; + } + + uint32_t priority = ConstructorAttr::DefaultPriority; + if (Attr.getNumArgs() > 0 && + !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority)) + return; + + D->addAttr(::new (S.Context) + ConstructorAttr(Attr.getRange(), S.Context, priority, + Attr.getAttributeSpellingListIndex())); +} + +static void handleDestructorAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // check the attribute arguments. + if (Attr.getNumArgs() > 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) + << Attr.getName() << 1; + return; + } + + uint32_t priority = DestructorAttr::DefaultPriority; + if (Attr.getNumArgs() > 0 && + !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority)) + return; + + D->addAttr(::new (S.Context) + DestructorAttr(Attr.getRange(), S.Context, priority, + Attr.getAttributeSpellingListIndex())); +} + +template <typename AttrTy> +static void handleAttrWithMessage(Sema &S, Decl *D, + const AttributeList &Attr) { + unsigned NumArgs = Attr.getNumArgs(); + if (NumArgs > 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) + << Attr.getName() << 1; + return; + } + + // Handle the case where the attribute has a text message. + StringRef Str; + if (NumArgs == 1 && !S.checkStringLiteralArgumentAttr(Attr, 0, Str)) + return; + + D->addAttr(::new (S.Context) AttrTy(Attr.getRange(), S.Context, Str, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCSuppresProtocolAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!cast<ObjCProtocolDecl>(D)->isThisDeclarationADefinition()) { + S.Diag(Attr.getLoc(), diag::err_objc_attr_protocol_requires_definition) + << Attr.getName() << Attr.getRange(); + return; + } + + D->addAttr(::new (S.Context) + ObjCExplicitProtocolImplAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static bool checkAvailabilityAttr(Sema &S, SourceRange Range, + IdentifierInfo *Platform, + VersionTuple Introduced, + VersionTuple Deprecated, + VersionTuple Obsoleted) { + StringRef PlatformName + = AvailabilityAttr::getPrettyPlatformName(Platform->getName()); + if (PlatformName.empty()) + PlatformName = Platform->getName(); + + // Ensure that Introduced <= Deprecated <= Obsoleted (although not all + // of these steps are needed). + if (!Introduced.empty() && !Deprecated.empty() && + !(Introduced <= Deprecated)) { + S.Diag(Range.getBegin(), diag::warn_availability_version_ordering) + << 1 << PlatformName << Deprecated.getAsString() + << 0 << Introduced.getAsString(); + return true; + } + + if (!Introduced.empty() && !Obsoleted.empty() && + !(Introduced <= Obsoleted)) { + S.Diag(Range.getBegin(), diag::warn_availability_version_ordering) + << 2 << PlatformName << Obsoleted.getAsString() + << 0 << Introduced.getAsString(); + return true; + } + + if (!Deprecated.empty() && !Obsoleted.empty() && + !(Deprecated <= Obsoleted)) { + S.Diag(Range.getBegin(), diag::warn_availability_version_ordering) + << 2 << PlatformName << Obsoleted.getAsString() + << 1 << Deprecated.getAsString(); + return true; + } + + return false; +} + +/// \brief Check whether the two versions match. +/// +/// If either version tuple is empty, then they are assumed to match. If +/// \p BeforeIsOkay is true, then \p X can be less than or equal to \p Y. +static bool versionsMatch(const VersionTuple &X, const VersionTuple &Y, + bool BeforeIsOkay) { + if (X.empty() || Y.empty()) + return true; + + if (X == Y) + return true; + + if (BeforeIsOkay && X < Y) + return true; + + return false; +} + +AvailabilityAttr *Sema::mergeAvailabilityAttr(NamedDecl *D, SourceRange Range, + IdentifierInfo *Platform, + VersionTuple Introduced, + VersionTuple Deprecated, + VersionTuple Obsoleted, + bool IsUnavailable, + StringRef Message, + bool Override, + unsigned AttrSpellingListIndex) { + VersionTuple MergedIntroduced = Introduced; + VersionTuple MergedDeprecated = Deprecated; + VersionTuple MergedObsoleted = Obsoleted; + bool FoundAny = false; + + if (D->hasAttrs()) { + AttrVec &Attrs = D->getAttrs(); + for (unsigned i = 0, e = Attrs.size(); i != e;) { + const AvailabilityAttr *OldAA = dyn_cast<AvailabilityAttr>(Attrs[i]); + if (!OldAA) { + ++i; + continue; + } + + IdentifierInfo *OldPlatform = OldAA->getPlatform(); + if (OldPlatform != Platform) { + ++i; + continue; + } + + FoundAny = true; + VersionTuple OldIntroduced = OldAA->getIntroduced(); + VersionTuple OldDeprecated = OldAA->getDeprecated(); + VersionTuple OldObsoleted = OldAA->getObsoleted(); + bool OldIsUnavailable = OldAA->getUnavailable(); + + if (!versionsMatch(OldIntroduced, Introduced, Override) || + !versionsMatch(Deprecated, OldDeprecated, Override) || + !versionsMatch(Obsoleted, OldObsoleted, Override) || + !(OldIsUnavailable == IsUnavailable || + (Override && !OldIsUnavailable && IsUnavailable))) { + if (Override) { + int Which = -1; + VersionTuple FirstVersion; + VersionTuple SecondVersion; + if (!versionsMatch(OldIntroduced, Introduced, Override)) { + Which = 0; + FirstVersion = OldIntroduced; + SecondVersion = Introduced; + } else if (!versionsMatch(Deprecated, OldDeprecated, Override)) { + Which = 1; + FirstVersion = Deprecated; + SecondVersion = OldDeprecated; + } else if (!versionsMatch(Obsoleted, OldObsoleted, Override)) { + Which = 2; + FirstVersion = Obsoleted; + SecondVersion = OldObsoleted; + } + + if (Which == -1) { + Diag(OldAA->getLocation(), + diag::warn_mismatched_availability_override_unavail) + << AvailabilityAttr::getPrettyPlatformName(Platform->getName()); + } else { + Diag(OldAA->getLocation(), + diag::warn_mismatched_availability_override) + << Which + << AvailabilityAttr::getPrettyPlatformName(Platform->getName()) + << FirstVersion.getAsString() << SecondVersion.getAsString(); + } + Diag(Range.getBegin(), diag::note_overridden_method); + } else { + Diag(OldAA->getLocation(), diag::warn_mismatched_availability); + Diag(Range.getBegin(), diag::note_previous_attribute); + } + + Attrs.erase(Attrs.begin() + i); + --e; + continue; + } + + VersionTuple MergedIntroduced2 = MergedIntroduced; + VersionTuple MergedDeprecated2 = MergedDeprecated; + VersionTuple MergedObsoleted2 = MergedObsoleted; + + if (MergedIntroduced2.empty()) + MergedIntroduced2 = OldIntroduced; + if (MergedDeprecated2.empty()) + MergedDeprecated2 = OldDeprecated; + if (MergedObsoleted2.empty()) + MergedObsoleted2 = OldObsoleted; + + if (checkAvailabilityAttr(*this, OldAA->getRange(), Platform, + MergedIntroduced2, MergedDeprecated2, + MergedObsoleted2)) { + Attrs.erase(Attrs.begin() + i); + --e; + continue; + } + + MergedIntroduced = MergedIntroduced2; + MergedDeprecated = MergedDeprecated2; + MergedObsoleted = MergedObsoleted2; + ++i; + } + } + + if (FoundAny && + MergedIntroduced == Introduced && + MergedDeprecated == Deprecated && + MergedObsoleted == Obsoleted) + return nullptr; + + // Only create a new attribute if !Override, but we want to do + // the checking. + if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced, + MergedDeprecated, MergedObsoleted) && + !Override) { + return ::new (Context) AvailabilityAttr(Range, Context, Platform, + Introduced, Deprecated, + Obsoleted, IsUnavailable, Message, + AttrSpellingListIndex); + } + return nullptr; +} + +static void handleAvailabilityAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkAttributeNumArgs(S, Attr, 1)) + return; + IdentifierLoc *Platform = Attr.getArgAsIdent(0); + unsigned Index = Attr.getAttributeSpellingListIndex(); + + IdentifierInfo *II = Platform->Ident; + if (AvailabilityAttr::getPrettyPlatformName(II->getName()).empty()) + S.Diag(Platform->Loc, diag::warn_availability_unknown_platform) + << Platform->Ident; + + NamedDecl *ND = dyn_cast<NamedDecl>(D); + if (!ND) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); + return; + } + + AvailabilityChange Introduced = Attr.getAvailabilityIntroduced(); + AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated(); + AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted(); + bool IsUnavailable = Attr.getUnavailableLoc().isValid(); + StringRef Str; + if (const StringLiteral *SE = + dyn_cast_or_null<StringLiteral>(Attr.getMessageExpr())) + Str = SE->getString(); + + AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND, Attr.getRange(), II, + Introduced.Version, + Deprecated.Version, + Obsoleted.Version, + IsUnavailable, Str, + /*Override=*/false, + Index); + if (NewAttr) + D->addAttr(NewAttr); +} + +template <class T> +static T *mergeVisibilityAttr(Sema &S, Decl *D, SourceRange range, + typename T::VisibilityType value, + unsigned attrSpellingListIndex) { + T *existingAttr = D->getAttr<T>(); + if (existingAttr) { + typename T::VisibilityType existingValue = existingAttr->getVisibility(); + if (existingValue == value) + return nullptr; + S.Diag(existingAttr->getLocation(), diag::err_mismatched_visibility); + S.Diag(range.getBegin(), diag::note_previous_attribute); + D->dropAttr<T>(); + } + return ::new (S.Context) T(range, S.Context, value, attrSpellingListIndex); +} + +VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range, + VisibilityAttr::VisibilityType Vis, + unsigned AttrSpellingListIndex) { + return ::mergeVisibilityAttr<VisibilityAttr>(*this, D, Range, Vis, + AttrSpellingListIndex); +} + +TypeVisibilityAttr *Sema::mergeTypeVisibilityAttr(Decl *D, SourceRange Range, + TypeVisibilityAttr::VisibilityType Vis, + unsigned AttrSpellingListIndex) { + return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, Range, Vis, + AttrSpellingListIndex); +} + +static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr, + bool isTypeVisibility) { + // Visibility attributes don't mean anything on a typedef. + if (isa<TypedefNameDecl>(D)) { + S.Diag(Attr.getRange().getBegin(), diag::warn_attribute_ignored) + << Attr.getName(); + return; + } + + // 'type_visibility' can only go on a type or namespace. + if (isTypeVisibility && + !(isa<TagDecl>(D) || + isa<ObjCInterfaceDecl>(D) || + isa<NamespaceDecl>(D))) { + S.Diag(Attr.getRange().getBegin(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedTypeOrNamespace; + return; + } + + // Check that the argument is a string literal. + StringRef TypeStr; + SourceLocation LiteralLoc; + if (!S.checkStringLiteralArgumentAttr(Attr, 0, TypeStr, &LiteralLoc)) + return; + + VisibilityAttr::VisibilityType type; + if (!VisibilityAttr::ConvertStrToVisibilityType(TypeStr, type)) { + S.Diag(LiteralLoc, diag::warn_attribute_type_not_supported) + << Attr.getName() << TypeStr; + return; + } + + // Complain about attempts to use protected visibility on targets + // (like Darwin) that don't support it. + if (type == VisibilityAttr::Protected && + !S.Context.getTargetInfo().hasProtectedVisibility()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_protected_visibility); + type = VisibilityAttr::Default; + } + + unsigned Index = Attr.getAttributeSpellingListIndex(); + clang::Attr *newAttr; + if (isTypeVisibility) { + newAttr = S.mergeTypeVisibilityAttr(D, Attr.getRange(), + (TypeVisibilityAttr::VisibilityType) type, + Index); + } else { + newAttr = S.mergeVisibilityAttr(D, Attr.getRange(), type, Index); + } + if (newAttr) + D->addAttr(newAttr); +} + +static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl, + const AttributeList &Attr) { + ObjCMethodDecl *method = cast<ObjCMethodDecl>(decl); + if (!Attr.isArgIdent(0)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 1 << AANT_ArgumentIdentifier; + return; + } + + IdentifierLoc *IL = Attr.getArgAsIdent(0); + ObjCMethodFamilyAttr::FamilyKind F; + if (!ObjCMethodFamilyAttr::ConvertStrToFamilyKind(IL->Ident->getName(), F)) { + S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << Attr.getName() + << IL->Ident; + return; + } + + if (F == ObjCMethodFamilyAttr::OMF_init && + !method->getReturnType()->isObjCObjectPointerType()) { + S.Diag(method->getLocation(), diag::err_init_method_bad_return_type) + << method->getReturnType(); + // Ignore the attribute. + return; + } + + method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getRange(), + S.Context, F, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) { + if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) { + QualType T = TD->getUnderlyingType(); + if (!T->isCARCBridgableType()) { + S.Diag(TD->getLocation(), diag::err_nsobject_attribute); + return; + } + } + else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) { + QualType T = PD->getType(); + if (!T->isCARCBridgableType()) { + S.Diag(PD->getLocation(), diag::err_nsobject_attribute); + return; + } + } + else { + // It is okay to include this attribute on properties, e.g.: + // + // @property (retain, nonatomic) struct Bork *Q __attribute__((NSObject)); + // + // In this case it follows tradition and suppresses an error in the above + // case. + S.Diag(D->getLocation(), diag::warn_nsobject_attribute); + } + D->addAttr(::new (S.Context) + ObjCNSObjectAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!Attr.isArgIdent(0)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 1 << AANT_ArgumentIdentifier; + return; + } + + IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident; + BlocksAttr::BlockType type; + if (!BlocksAttr::ConvertStrToBlockType(II->getName(), type)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) + << Attr.getName() << II; + return; + } + + D->addAttr(::new (S.Context) + BlocksAttr(Attr.getRange(), S.Context, type, + Attr.getAttributeSpellingListIndex())); +} + +static void handleSentinelAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // check the attribute arguments. + if (Attr.getNumArgs() > 2) { + S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) + << Attr.getName() << 2; + return; + } + + unsigned sentinel = (unsigned)SentinelAttr::DefaultSentinel; + if (Attr.getNumArgs() > 0) { + Expr *E = Attr.getArgAsExpr(0); + llvm::APSInt Idx(32); + if (E->isTypeDependent() || E->isValueDependent() || + !E->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 1 << AANT_ArgumentIntegerConstant + << E->getSourceRange(); + return; + } + + if (Idx.isSigned() && Idx.isNegative()) { + S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero) + << E->getSourceRange(); + return; + } + + sentinel = Idx.getZExtValue(); + } + + unsigned nullPos = (unsigned)SentinelAttr::DefaultNullPos; + if (Attr.getNumArgs() > 1) { + Expr *E = Attr.getArgAsExpr(1); + llvm::APSInt Idx(32); + if (E->isTypeDependent() || E->isValueDependent() || + !E->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 2 << AANT_ArgumentIntegerConstant + << E->getSourceRange(); + return; + } + nullPos = Idx.getZExtValue(); + + if ((Idx.isSigned() && Idx.isNegative()) || nullPos > 1) { + // FIXME: This error message could be improved, it would be nice + // to say what the bounds actually are. + S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one) + << E->getSourceRange(); + return; + } + } + + if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { + const FunctionType *FT = FD->getType()->castAs<FunctionType>(); + if (isa<FunctionNoProtoType>(FT)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_named_arguments); + return; + } + + if (!cast<FunctionProtoType>(FT)->isVariadic()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0; + return; + } + } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { + if (!MD->isVariadic()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0; + return; + } + } else if (BlockDecl *BD = dyn_cast<BlockDecl>(D)) { + if (!BD->isVariadic()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 1; + return; + } + } else if (const VarDecl *V = dyn_cast<VarDecl>(D)) { + QualType Ty = V->getType(); + if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { + const FunctionType *FT = Ty->isFunctionPointerType() + ? D->getFunctionType() + : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>(); + if (!cast<FunctionProtoType>(FT)->isVariadic()) { + int m = Ty->isFunctionPointerType() ? 0 : 1; + S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m; + return; + } + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionMethodOrBlock; + return; + } + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionMethodOrBlock; + return; + } + D->addAttr(::new (S.Context) + SentinelAttr(Attr.getRange(), S.Context, sentinel, nullPos, + Attr.getAttributeSpellingListIndex())); +} + +static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) { + if (D->getFunctionType() && + D->getFunctionType()->getReturnType()->isVoidType()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method) + << Attr.getName() << 0; + return; + } + if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) + if (MD->getReturnType()->isVoidType()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method) + << Attr.getName() << 1; + return; + } + + D->addAttr(::new (S.Context) + WarnUnusedResultAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleWeakImportAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // weak_import only applies to variable & function declarations. + bool isDef = false; + if (!D->canBeWeakImported(isDef)) { + if (isDef) + S.Diag(Attr.getLoc(), diag::warn_attribute_invalid_on_definition) + << "weak_import"; + else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) || + (S.Context.getTargetInfo().getTriple().isOSDarwin() && + (isa<ObjCInterfaceDecl>(D) || isa<EnumDecl>(D)))) { + // Nothing to warn about here. + } else + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariableOrFunction; + + return; + } + + D->addAttr(::new (S.Context) + WeakImportAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +// Handles reqd_work_group_size and work_group_size_hint. +template <typename WorkGroupAttr> +static void handleWorkGroupSize(Sema &S, Decl *D, + const AttributeList &Attr) { + uint32_t WGSize[3]; + for (unsigned i = 0; i < 3; ++i) { + const Expr *E = Attr.getArgAsExpr(i); + if (!checkUInt32Argument(S, Attr, E, WGSize[i], i)) + return; + if (WGSize[i] == 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_is_zero) + << Attr.getName() << E->getSourceRange(); + return; + } + } + + WorkGroupAttr *Existing = D->getAttr<WorkGroupAttr>(); + if (Existing && !(Existing->getXDim() == WGSize[0] && + Existing->getYDim() == WGSize[1] && + Existing->getZDim() == WGSize[2])) + S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName(); + + D->addAttr(::new (S.Context) WorkGroupAttr(Attr.getRange(), S.Context, + WGSize[0], WGSize[1], WGSize[2], + Attr.getAttributeSpellingListIndex())); +} + +static void handleVecTypeHint(Sema &S, Decl *D, const AttributeList &Attr) { + if (!Attr.hasParsedType()) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << Attr.getName() << 1; + return; + } + + TypeSourceInfo *ParmTSI = nullptr; + QualType ParmType = S.GetTypeFromParser(Attr.getTypeArg(), &ParmTSI); + assert(ParmTSI && "no type source info for attribute argument"); + + if (!ParmType->isExtVectorType() && !ParmType->isFloatingType() && + (ParmType->isBooleanType() || + !ParmType->isIntegralType(S.getASTContext()))) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_vec_type_hint) + << ParmType; + return; + } + + if (VecTypeHintAttr *A = D->getAttr<VecTypeHintAttr>()) { + if (!S.Context.hasSameType(A->getTypeHint(), ParmType)) { + S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName(); + return; + } + } + + D->addAttr(::new (S.Context) VecTypeHintAttr(Attr.getLoc(), S.Context, + ParmTSI, + Attr.getAttributeSpellingListIndex())); +} + +SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range, + StringRef Name, + unsigned AttrSpellingListIndex) { + if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) { + if (ExistingAttr->getName() == Name) + return nullptr; + Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section); + Diag(Range.getBegin(), diag::note_previous_attribute); + return nullptr; + } + return ::new (Context) SectionAttr(Range, Context, Name, + AttrSpellingListIndex); +} + +static void handleSectionAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // Make sure that there is a string literal as the sections's single + // argument. + StringRef Str; + SourceLocation LiteralLoc; + if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &LiteralLoc)) + return; + + // If the target wants to validate the section specifier, make it happen. + std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(Str); + if (!Error.empty()) { + S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target) + << Error; + return; + } + + unsigned Index = Attr.getAttributeSpellingListIndex(); + SectionAttr *NewAttr = S.mergeSectionAttr(D, Attr.getRange(), Str, Index); + if (NewAttr) + D->addAttr(NewAttr); +} + + +static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) { + VarDecl *VD = cast<VarDecl>(D); + if (!VD->hasLocalStorage()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); + return; + } + + Expr *E = Attr.getArgAsExpr(0); + SourceLocation Loc = E->getExprLoc(); + FunctionDecl *FD = nullptr; + DeclarationNameInfo NI; + + // gcc only allows for simple identifiers. Since we support more than gcc, we + // will warn the user. + if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { + if (DRE->hasQualifier()) + S.Diag(Loc, diag::warn_cleanup_ext); + FD = dyn_cast<FunctionDecl>(DRE->getDecl()); + NI = DRE->getNameInfo(); + if (!FD) { + S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 1 + << NI.getName(); + return; + } + } else if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) { + if (ULE->hasExplicitTemplateArgs()) + S.Diag(Loc, diag::warn_cleanup_ext); + FD = S.ResolveSingleFunctionTemplateSpecialization(ULE, true); + NI = ULE->getNameInfo(); + if (!FD) { + S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 2 + << NI.getName(); + if (ULE->getType() == S.Context.OverloadTy) + S.NoteAllOverloadCandidates(ULE); + return; + } + } else { + S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 0; + return; + } + + if (FD->getNumParams() != 1) { + S.Diag(Loc, diag::err_attribute_cleanup_func_must_take_one_arg) + << NI.getName(); + return; + } + + // We're currently more strict than GCC about what function types we accept. + // If this ever proves to be a problem it should be easy to fix. + QualType Ty = S.Context.getPointerType(VD->getType()); + QualType ParamTy = FD->getParamDecl(0)->getType(); + if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(), + ParamTy, Ty) != Sema::Compatible) { + S.Diag(Loc, diag::err_attribute_cleanup_func_arg_incompatible_type) + << NI.getName() << ParamTy << Ty; + return; + } + + D->addAttr(::new (S.Context) + CleanupAttr(Attr.getRange(), S.Context, FD, + Attr.getAttributeSpellingListIndex())); +} + +/// Handle __attribute__((format_arg((idx)))) attribute based on +/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html +static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &Attr) { + Expr *IdxExpr = Attr.getArgAsExpr(0); + uint64_t Idx; + if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 1, IdxExpr, Idx)) + return; + + // make sure the format string is really a string + QualType Ty = getFunctionOrMethodParamType(D, Idx); + + bool not_nsstring_type = !isNSStringType(Ty, S.Context); + if (not_nsstring_type && + !isCFStringType(Ty, S.Context) && + (!Ty->isPointerType() || + !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) { + // FIXME: Should highlight the actual expression that has the wrong type. + S.Diag(Attr.getLoc(), diag::err_format_attribute_not) + << (not_nsstring_type ? "a string type" : "an NSString") + << IdxExpr->getSourceRange(); + return; + } + Ty = getFunctionOrMethodResultType(D); + if (!isNSStringType(Ty, S.Context) && + !isCFStringType(Ty, S.Context) && + (!Ty->isPointerType() || + !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) { + // FIXME: Should highlight the actual expression that has the wrong type. + S.Diag(Attr.getLoc(), diag::err_format_attribute_result_not) + << (not_nsstring_type ? "string type" : "NSString") + << IdxExpr->getSourceRange(); + return; + } + + // We cannot use the Idx returned from checkFunctionOrMethodParameterIndex + // because that has corrected for the implicit this parameter, and is zero- + // based. The attribute expects what the user wrote explicitly. + llvm::APSInt Val; + IdxExpr->EvaluateAsInt(Val, S.Context); + + D->addAttr(::new (S.Context) + FormatArgAttr(Attr.getRange(), S.Context, Val.getZExtValue(), + Attr.getAttributeSpellingListIndex())); +} + +enum FormatAttrKind { + CFStringFormat, + NSStringFormat, + StrftimeFormat, + SupportedFormat, + IgnoredFormat, + InvalidFormat +}; + +/// getFormatAttrKind - Map from format attribute names to supported format +/// types. +static FormatAttrKind getFormatAttrKind(StringRef Format) { + return llvm::StringSwitch<FormatAttrKind>(Format) + // Check for formats that get handled specially. + .Case("NSString", NSStringFormat) + .Case("CFString", CFStringFormat) + .Case("strftime", StrftimeFormat) + + // Otherwise, check for supported formats. + .Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat) + .Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat) + .Case("kprintf", SupportedFormat) // OpenBSD. + + .Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat) + .Default(InvalidFormat); +} + +/// Handle __attribute__((init_priority(priority))) attributes based on +/// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html +static void handleInitPriorityAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!S.getLangOpts().CPlusPlus) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); + return; + } + + if (S.getCurFunctionOrMethodDecl()) { + S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr); + Attr.setInvalid(); + return; + } + QualType T = cast<VarDecl>(D)->getType(); + if (S.Context.getAsArrayType(T)) + T = S.Context.getBaseElementType(T); + if (!T->getAs<RecordType>()) { + S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr); + Attr.setInvalid(); + return; + } + + Expr *E = Attr.getArgAsExpr(0); + uint32_t prioritynum; + if (!checkUInt32Argument(S, Attr, E, prioritynum)) { + Attr.setInvalid(); + return; + } + + if (prioritynum < 101 || prioritynum > 65535) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range) + << E->getSourceRange(); + Attr.setInvalid(); + return; + } + D->addAttr(::new (S.Context) + InitPriorityAttr(Attr.getRange(), S.Context, prioritynum, + Attr.getAttributeSpellingListIndex())); +} + +FormatAttr *Sema::mergeFormatAttr(Decl *D, SourceRange Range, + IdentifierInfo *Format, int FormatIdx, + int FirstArg, + unsigned AttrSpellingListIndex) { + // Check whether we already have an equivalent format attribute. + for (auto *F : D->specific_attrs<FormatAttr>()) { + if (F->getType() == Format && + F->getFormatIdx() == FormatIdx && + F->getFirstArg() == FirstArg) { + // If we don't have a valid location for this attribute, adopt the + // location. + if (F->getLocation().isInvalid()) + F->setRange(Range); + return nullptr; + } + } + + return ::new (Context) FormatAttr(Range, Context, Format, FormatIdx, + FirstArg, AttrSpellingListIndex); +} + +/// Handle __attribute__((format(type,idx,firstarg))) attributes based on +/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html +static void handleFormatAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!Attr.isArgIdent(0)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 1 << AANT_ArgumentIdentifier; + return; + } + + // In C++ the implicit 'this' function parameter also counts, and they are + // counted from one. + bool HasImplicitThisParam = isInstanceMethod(D); + unsigned NumArgs = getFunctionOrMethodNumParams(D) + HasImplicitThisParam; + + IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident; + StringRef Format = II->getName(); + + // Normalize the argument, __foo__ becomes foo. + if (Format.startswith("__") && Format.endswith("__")) { + Format = Format.substr(2, Format.size() - 4); + // If we've modified the string name, we need a new identifier for it. + II = &S.Context.Idents.get(Format); + } + + // Check for supported formats. + FormatAttrKind Kind = getFormatAttrKind(Format); + + if (Kind == IgnoredFormat) + return; + + if (Kind == InvalidFormat) { + S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) + << Attr.getName() << II->getName(); + return; + } + + // checks for the 2nd argument + Expr *IdxExpr = Attr.getArgAsExpr(1); + uint32_t Idx; + if (!checkUInt32Argument(S, Attr, IdxExpr, Idx, 2)) + return; + + if (Idx < 1 || Idx > NumArgs) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) + << Attr.getName() << 2 << IdxExpr->getSourceRange(); + return; + } + + // FIXME: Do we need to bounds check? + unsigned ArgIdx = Idx - 1; + + if (HasImplicitThisParam) { + if (ArgIdx == 0) { + S.Diag(Attr.getLoc(), + diag::err_format_attribute_implicit_this_format_string) + << IdxExpr->getSourceRange(); + return; + } + ArgIdx--; + } + + // make sure the format string is really a string + QualType Ty = getFunctionOrMethodParamType(D, ArgIdx); + + if (Kind == CFStringFormat) { + if (!isCFStringType(Ty, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_format_attribute_not) + << "a CFString" << IdxExpr->getSourceRange(); + return; + } + } else if (Kind == NSStringFormat) { + // FIXME: do we need to check if the type is NSString*? What are the + // semantics? + if (!isNSStringType(Ty, S.Context)) { + // FIXME: Should highlight the actual expression that has the wrong type. + S.Diag(Attr.getLoc(), diag::err_format_attribute_not) + << "an NSString" << IdxExpr->getSourceRange(); + return; + } + } else if (!Ty->isPointerType() || + !Ty->getAs<PointerType>()->getPointeeType()->isCharType()) { + // FIXME: Should highlight the actual expression that has the wrong type. + S.Diag(Attr.getLoc(), diag::err_format_attribute_not) + << "a string type" << IdxExpr->getSourceRange(); + return; + } + + // check the 3rd argument + Expr *FirstArgExpr = Attr.getArgAsExpr(2); + uint32_t FirstArg; + if (!checkUInt32Argument(S, Attr, FirstArgExpr, FirstArg, 3)) + return; + + // check if the function is variadic if the 3rd argument non-zero + if (FirstArg != 0) { + if (isFunctionOrMethodVariadic(D)) { + ++NumArgs; // +1 for ... + } else { + S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic); + return; + } + } + + // strftime requires FirstArg to be 0 because it doesn't read from any + // variable the input is just the current time + the format string. + if (Kind == StrftimeFormat) { + if (FirstArg != 0) { + S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter) + << FirstArgExpr->getSourceRange(); + return; + } + // if 0 it disables parameter checking (to use with e.g. va_list) + } else if (FirstArg != 0 && FirstArg != NumArgs) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) + << Attr.getName() << 3 << FirstArgExpr->getSourceRange(); + return; + } + + FormatAttr *NewAttr = S.mergeFormatAttr(D, Attr.getRange(), II, + Idx, FirstArg, + Attr.getAttributeSpellingListIndex()); + if (NewAttr) + D->addAttr(NewAttr); +} + +static void handleTransparentUnionAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + // Try to find the underlying union declaration. + RecordDecl *RD = nullptr; + TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D); + if (TD && TD->getUnderlyingType()->isUnionType()) + RD = TD->getUnderlyingType()->getAsUnionType()->getDecl(); + else + RD = dyn_cast<RecordDecl>(D); + + if (!RD || !RD->isUnion()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedUnion; + return; + } + + if (!RD->isCompleteDefinition()) { + S.Diag(Attr.getLoc(), + diag::warn_transparent_union_attribute_not_definition); + return; + } + + RecordDecl::field_iterator Field = RD->field_begin(), + FieldEnd = RD->field_end(); + if (Field == FieldEnd) { + S.Diag(Attr.getLoc(), diag::warn_transparent_union_attribute_zero_fields); + return; + } + + FieldDecl *FirstField = *Field; + QualType FirstType = FirstField->getType(); + if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) { + S.Diag(FirstField->getLocation(), + diag::warn_transparent_union_attribute_floating) + << FirstType->isVectorType() << FirstType; + return; + } + + uint64_t FirstSize = S.Context.getTypeSize(FirstType); + uint64_t FirstAlign = S.Context.getTypeAlign(FirstType); + for (; Field != FieldEnd; ++Field) { + QualType FieldType = Field->getType(); + // FIXME: this isn't fully correct; we also need to test whether the + // members of the union would all have the same calling convention as the + // first member of the union. Checking just the size and alignment isn't + // sufficient (consider structs passed on the stack instead of in registers + // as an example). + if (S.Context.getTypeSize(FieldType) != FirstSize || + S.Context.getTypeAlign(FieldType) > FirstAlign) { + // Warn if we drop the attribute. + bool isSize = S.Context.getTypeSize(FieldType) != FirstSize; + unsigned FieldBits = isSize? S.Context.getTypeSize(FieldType) + : S.Context.getTypeAlign(FieldType); + S.Diag(Field->getLocation(), + diag::warn_transparent_union_attribute_field_size_align) + << isSize << Field->getDeclName() << FieldBits; + unsigned FirstBits = isSize? FirstSize : FirstAlign; + S.Diag(FirstField->getLocation(), + diag::note_transparent_union_first_field_size_align) + << isSize << FirstBits; + return; + } + } + + RD->addAttr(::new (S.Context) + TransparentUnionAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleAnnotateAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // Make sure that there is a string literal as the annotation's single + // argument. + StringRef Str; + if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str)) + return; + + // Don't duplicate annotations that are already set. + for (const auto *I : D->specific_attrs<AnnotateAttr>()) { + if (I->getAnnotation() == Str) + return; + } + + D->addAttr(::new (S.Context) + AnnotateAttr(Attr.getRange(), S.Context, Str, + Attr.getAttributeSpellingListIndex())); +} + +static void handleAlignedAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // check the attribute arguments. + if (Attr.getNumArgs() > 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << Attr.getName() << 1; + return; + } + + if (Attr.getNumArgs() == 0) { + D->addAttr(::new (S.Context) AlignedAttr(Attr.getRange(), S.Context, + true, nullptr, Attr.getAttributeSpellingListIndex())); + return; + } + + Expr *E = Attr.getArgAsExpr(0); + if (Attr.isPackExpansion() && !E->containsUnexpandedParameterPack()) { + S.Diag(Attr.getEllipsisLoc(), + diag::err_pack_expansion_without_parameter_packs); + return; + } + + if (!Attr.isPackExpansion() && S.DiagnoseUnexpandedParameterPack(E)) + return; + + S.AddAlignedAttr(Attr.getRange(), D, E, Attr.getAttributeSpellingListIndex(), + Attr.isPackExpansion()); +} + +void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E, + unsigned SpellingListIndex, bool IsPackExpansion) { + AlignedAttr TmpAttr(AttrRange, Context, true, E, SpellingListIndex); + SourceLocation AttrLoc = AttrRange.getBegin(); + + // C++11 alignas(...) and C11 _Alignas(...) have additional requirements. + if (TmpAttr.isAlignas()) { + // C++11 [dcl.align]p1: + // An alignment-specifier may be applied to a variable or to a class + // data member, but it shall not be applied to a bit-field, a function + // parameter, the formal parameter of a catch clause, or a variable + // declared with the register storage class specifier. An + // alignment-specifier may also be applied to the declaration of a class + // or enumeration type. + // C11 6.7.5/2: + // An alignment attribute shall not be specified in a declaration of + // a typedef, or a bit-field, or a function, or a parameter, or an + // object declared with the register storage-class specifier. + int DiagKind = -1; + if (isa<ParmVarDecl>(D)) { + DiagKind = 0; + } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) { + if (VD->getStorageClass() == SC_Register) + DiagKind = 1; + if (VD->isExceptionVariable()) + DiagKind = 2; + } else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { + if (FD->isBitField()) + DiagKind = 3; + } else if (!isa<TagDecl>(D)) { + Diag(AttrLoc, diag::err_attribute_wrong_decl_type) << &TmpAttr + << (TmpAttr.isC11() ? ExpectedVariableOrField + : ExpectedVariableFieldOrTag); + return; + } + if (DiagKind != -1) { + Diag(AttrLoc, diag::err_alignas_attribute_wrong_decl_type) + << &TmpAttr << DiagKind; + return; + } + } + + if (E->isTypeDependent() || E->isValueDependent()) { + // Save dependent expressions in the AST to be instantiated. + AlignedAttr *AA = ::new (Context) AlignedAttr(TmpAttr); + AA->setPackExpansion(IsPackExpansion); + D->addAttr(AA); + return; + } + + // FIXME: Cache the number on the Attr object? + llvm::APSInt Alignment(32); + ExprResult ICE + = VerifyIntegerConstantExpression(E, &Alignment, + diag::err_aligned_attribute_argument_not_int, + /*AllowFold*/ false); + if (ICE.isInvalid()) + return; + + // C++11 [dcl.align]p2: + // -- if the constant expression evaluates to zero, the alignment + // specifier shall have no effect + // C11 6.7.5p6: + // An alignment specification of zero has no effect. + if (!(TmpAttr.isAlignas() && !Alignment) && + !llvm::isPowerOf2_64(Alignment.getZExtValue())) { + Diag(AttrLoc, diag::err_attribute_aligned_not_power_of_two) + << E->getSourceRange(); + return; + } + + // Alignment calculations can wrap around if it's greater than 2**28. + unsigned MaxValidAlignment = TmpAttr.isDeclspec() ? 8192 : 268435456; + if (Alignment.getZExtValue() > MaxValidAlignment) { + Diag(AttrLoc, diag::err_attribute_aligned_too_great) << MaxValidAlignment + << E->getSourceRange(); + return; + } + + AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, true, + ICE.get(), SpellingListIndex); + AA->setPackExpansion(IsPackExpansion); + D->addAttr(AA); +} + +void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *TS, + unsigned SpellingListIndex, bool IsPackExpansion) { + // FIXME: Cache the number on the Attr object if non-dependent? + // FIXME: Perform checking of type validity + AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, false, TS, + SpellingListIndex); + AA->setPackExpansion(IsPackExpansion); + D->addAttr(AA); +} + +void Sema::CheckAlignasUnderalignment(Decl *D) { + assert(D->hasAttrs() && "no attributes on decl"); + + QualType Ty; + if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) + Ty = VD->getType(); + else + Ty = Context.getTagDeclType(cast<TagDecl>(D)); + if (Ty->isDependentType() || Ty->isIncompleteType()) + return; + + // C++11 [dcl.align]p5, C11 6.7.5/4: + // The combined effect of all alignment attributes in a declaration shall + // not specify an alignment that is less strict than the alignment that + // would otherwise be required for the entity being declared. + AlignedAttr *AlignasAttr = nullptr; + unsigned Align = 0; + for (auto *I : D->specific_attrs<AlignedAttr>()) { + if (I->isAlignmentDependent()) + return; + if (I->isAlignas()) + AlignasAttr = I; + Align = std::max(Align, I->getAlignment(Context)); + } + + if (AlignasAttr && Align) { + CharUnits RequestedAlign = Context.toCharUnitsFromBits(Align); + CharUnits NaturalAlign = Context.getTypeAlignInChars(Ty); + if (NaturalAlign > RequestedAlign) + Diag(AlignasAttr->getLocation(), diag::err_alignas_underaligned) + << Ty << (unsigned)NaturalAlign.getQuantity(); + } +} + +bool Sema::checkMSInheritanceAttrOnDefinition( + CXXRecordDecl *RD, SourceRange Range, bool BestCase, + MSInheritanceAttr::Spelling SemanticSpelling) { + assert(RD->hasDefinition() && "RD has no definition!"); + + // We may not have seen base specifiers or any virtual methods yet. We will + // have to wait until the record is defined to catch any mismatches. + if (!RD->getDefinition()->isCompleteDefinition()) + return false; + + // The unspecified model never matches what a definition could need. + if (SemanticSpelling == MSInheritanceAttr::Keyword_unspecified_inheritance) + return false; + + if (BestCase) { + if (RD->calculateInheritanceModel() == SemanticSpelling) + return false; + } else { + if (RD->calculateInheritanceModel() <= SemanticSpelling) + return false; + } + + Diag(Range.getBegin(), diag::err_mismatched_ms_inheritance) + << 0 /*definition*/; + Diag(RD->getDefinition()->getLocation(), diag::note_defined_here) + << RD->getNameAsString(); + return true; +} + +/// handleModeAttr - This attribute modifies the width of a decl with primitive +/// type. +/// +/// Despite what would be logical, the mode attribute is a decl attribute, not a +/// type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 'G' be +/// HImode, not an intermediate pointer. +static void handleModeAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // This attribute isn't documented, but glibc uses it. It changes + // the width of an int or unsigned int to the specified size. + if (!Attr.isArgIdent(0)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName() + << AANT_ArgumentIdentifier; + return; + } + + IdentifierInfo *Name = Attr.getArgAsIdent(0)->Ident; + StringRef Str = Name->getName(); + + // Normalize the attribute name, __foo__ becomes foo. + if (Str.startswith("__") && Str.endswith("__")) + Str = Str.substr(2, Str.size() - 4); + + unsigned DestWidth = 0; + bool IntegerMode = true; + bool ComplexMode = false; + switch (Str.size()) { + case 2: + switch (Str[0]) { + case 'Q': DestWidth = 8; break; + case 'H': DestWidth = 16; break; + case 'S': DestWidth = 32; break; + case 'D': DestWidth = 64; break; + case 'X': DestWidth = 96; break; + case 'T': DestWidth = 128; break; + } + if (Str[1] == 'F') { + IntegerMode = false; + } else if (Str[1] == 'C') { + IntegerMode = false; + ComplexMode = true; + } else if (Str[1] != 'I') { + DestWidth = 0; + } + break; + case 4: + // FIXME: glibc uses 'word' to define register_t; this is narrower than a + // pointer on PIC16 and other embedded platforms. + if (Str == "word") + DestWidth = S.Context.getTargetInfo().getPointerWidth(0); + else if (Str == "byte") + DestWidth = S.Context.getTargetInfo().getCharWidth(); + break; + case 7: + if (Str == "pointer") + DestWidth = S.Context.getTargetInfo().getPointerWidth(0); + break; + case 11: + if (Str == "unwind_word") + DestWidth = S.Context.getTargetInfo().getUnwindWordWidth(); + break; + } + + QualType OldTy; + if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) + OldTy = TD->getUnderlyingType(); + else if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) + OldTy = VD->getType(); + else { + S.Diag(D->getLocation(), diag::err_attr_wrong_decl) + << Attr.getName() << Attr.getRange(); + return; + } + + if (!OldTy->getAs<BuiltinType>() && !OldTy->isComplexType()) + S.Diag(Attr.getLoc(), diag::err_mode_not_primitive); + else if (IntegerMode) { + if (!OldTy->isIntegralOrEnumerationType()) + S.Diag(Attr.getLoc(), diag::err_mode_wrong_type); + } else if (ComplexMode) { + if (!OldTy->isComplexType()) + S.Diag(Attr.getLoc(), diag::err_mode_wrong_type); + } else { + if (!OldTy->isFloatingType()) + S.Diag(Attr.getLoc(), diag::err_mode_wrong_type); + } + + // FIXME: Sync this with InitializePredefinedMacros; we need to match int8_t + // and friends, at least with glibc. + // FIXME: Make sure floating-point mappings are accurate + // FIXME: Support XF and TF types + if (!DestWidth) { + S.Diag(Attr.getLoc(), diag::err_machine_mode) << 0 /*Unknown*/ << Name; + return; + } + + QualType NewTy; + + if (IntegerMode) + NewTy = S.Context.getIntTypeForBitwidth(DestWidth, + OldTy->isSignedIntegerType()); + else + NewTy = S.Context.getRealTypeForBitwidth(DestWidth); + + if (NewTy.isNull()) { + S.Diag(Attr.getLoc(), diag::err_machine_mode) << 1 /*Unsupported*/ << Name; + return; + } + + if (ComplexMode) { + NewTy = S.Context.getComplexType(NewTy); + } + + // Install the new type. + if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) + TD->setModedTypeSourceInfo(TD->getTypeSourceInfo(), NewTy); + else + cast<ValueDecl>(D)->setType(NewTy); + + D->addAttr(::new (S.Context) + ModeAttr(Attr.getRange(), S.Context, Name, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNoDebugAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { + if (!VD->hasGlobalStorage()) + S.Diag(Attr.getLoc(), + diag::warn_attribute_requires_functions_or_static_globals) + << Attr.getName(); + } else if (!isFunctionOrMethod(D)) { + S.Diag(Attr.getLoc(), + diag::warn_attribute_requires_functions_or_static_globals) + << Attr.getName(); + return; + } + + D->addAttr(::new (S.Context) + NoDebugAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleAlwaysInlineAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (checkAttrMutualExclusion<OptimizeNoneAttr>(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) + AlwaysInlineAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleOptimizeNoneAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (checkAttrMutualExclusion<AlwaysInlineAttr>(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) + OptimizeNoneAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleGlobalAttr(Sema &S, Decl *D, const AttributeList &Attr) { + FunctionDecl *FD = cast<FunctionDecl>(D); + if (!FD->getReturnType()->isVoidType()) { + SourceRange RTRange = FD->getReturnTypeSourceRange(); + S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return) + << FD->getType() + << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "void") + : FixItHint()); + return; + } + + D->addAttr(::new (S.Context) + CUDAGlobalAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleGNUInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) { + FunctionDecl *Fn = cast<FunctionDecl>(D); + if (!Fn->isInlineSpecified()) { + S.Diag(Attr.getLoc(), diag::warn_gnu_inline_attribute_requires_inline); + return; + } + + D->addAttr(::new (S.Context) + GNUInlineAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleCallConvAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (hasDeclarator(D)) return; + + const FunctionDecl *FD = dyn_cast<FunctionDecl>(D); + // Diagnostic is emitted elsewhere: here we store the (valid) Attr + // in the Decl node for syntactic reasoning, e.g., pretty-printing. + CallingConv CC; + if (S.CheckCallingConvAttr(Attr, CC, FD)) + return; + + if (!isa<ObjCMethodDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + switch (Attr.getKind()) { + case AttributeList::AT_FastCall: + D->addAttr(::new (S.Context) + FastCallAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_StdCall: + D->addAttr(::new (S.Context) + StdCallAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_ThisCall: + D->addAttr(::new (S.Context) + ThisCallAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_CDecl: + D->addAttr(::new (S.Context) + CDeclAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_Pascal: + D->addAttr(::new (S.Context) + PascalAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_MSABI: + D->addAttr(::new (S.Context) + MSABIAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_SysVABI: + D->addAttr(::new (S.Context) + SysVABIAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_Pcs: { + PcsAttr::PCSType PCS; + switch (CC) { + case CC_AAPCS: + PCS = PcsAttr::AAPCS; + break; + case CC_AAPCS_VFP: + PCS = PcsAttr::AAPCS_VFP; + break; + default: + llvm_unreachable("unexpected calling convention in pcs attribute"); + } + + D->addAttr(::new (S.Context) + PcsAttr(Attr.getRange(), S.Context, PCS, + Attr.getAttributeSpellingListIndex())); + return; + } + case AttributeList::AT_PnaclCall: + D->addAttr(::new (S.Context) + PnaclCallAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_IntelOclBicc: + D->addAttr(::new (S.Context) + IntelOclBiccAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + + default: + llvm_unreachable("unexpected attribute kind"); + } +} + +bool Sema::CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC, + const FunctionDecl *FD) { + if (attr.isInvalid()) + return true; + + unsigned ReqArgs = attr.getKind() == AttributeList::AT_Pcs ? 1 : 0; + if (!checkAttributeNumArgs(*this, attr, ReqArgs)) { + attr.setInvalid(); + return true; + } + + // TODO: diagnose uses of these conventions on the wrong target. + switch (attr.getKind()) { + case AttributeList::AT_CDecl: CC = CC_C; break; + case AttributeList::AT_FastCall: CC = CC_X86FastCall; break; + case AttributeList::AT_StdCall: CC = CC_X86StdCall; break; + case AttributeList::AT_ThisCall: CC = CC_X86ThisCall; break; + case AttributeList::AT_Pascal: CC = CC_X86Pascal; break; + case AttributeList::AT_MSABI: + CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_C : + CC_X86_64Win64; + break; + case AttributeList::AT_SysVABI: + CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_X86_64SysV : + CC_C; + break; + case AttributeList::AT_Pcs: { + StringRef StrRef; + if (!checkStringLiteralArgumentAttr(attr, 0, StrRef)) { + attr.setInvalid(); + return true; + } + if (StrRef == "aapcs") { + CC = CC_AAPCS; + break; + } else if (StrRef == "aapcs-vfp") { + CC = CC_AAPCS_VFP; + break; + } + + attr.setInvalid(); + Diag(attr.getLoc(), diag::err_invalid_pcs); + return true; + } + case AttributeList::AT_PnaclCall: CC = CC_PnaclCall; break; + case AttributeList::AT_IntelOclBicc: CC = CC_IntelOclBicc; break; + default: llvm_unreachable("unexpected attribute kind"); + } + + const TargetInfo &TI = Context.getTargetInfo(); + TargetInfo::CallingConvCheckResult A = TI.checkCallingConvention(CC); + if (A == TargetInfo::CCCR_Warning) { + Diag(attr.getLoc(), diag::warn_cconv_ignored) << attr.getName(); + + TargetInfo::CallingConvMethodType MT = TargetInfo::CCMT_Unknown; + if (FD) + MT = FD->isCXXInstanceMember() ? TargetInfo::CCMT_Member : + TargetInfo::CCMT_NonMember; + CC = TI.getDefaultCallingConv(MT); + } + + return false; +} + +/// Checks a regparm attribute, returning true if it is ill-formed and +/// otherwise setting numParams to the appropriate value. +bool Sema::CheckRegparmAttr(const AttributeList &Attr, unsigned &numParams) { + if (Attr.isInvalid()) + return true; + + if (!checkAttributeNumArgs(*this, Attr, 1)) { + Attr.setInvalid(); + return true; + } + + uint32_t NP; + Expr *NumParamsExpr = Attr.getArgAsExpr(0); + if (!checkUInt32Argument(*this, Attr, NumParamsExpr, NP)) { + Attr.setInvalid(); + return true; + } + + if (Context.getTargetInfo().getRegParmMax() == 0) { + Diag(Attr.getLoc(), diag::err_attribute_regparm_wrong_platform) + << NumParamsExpr->getSourceRange(); + Attr.setInvalid(); + return true; + } + + numParams = NP; + if (numParams > Context.getTargetInfo().getRegParmMax()) { + Diag(Attr.getLoc(), diag::err_attribute_regparm_invalid_number) + << Context.getTargetInfo().getRegParmMax() << NumParamsExpr->getSourceRange(); + Attr.setInvalid(); + return true; + } + + return false; +} + +static void handleLaunchBoundsAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + // check the attribute arguments. + if (Attr.getNumArgs() != 1 && Attr.getNumArgs() != 2) { + // FIXME: 0 is not okay. + S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) + << Attr.getName() << 2; + return; + } + + uint32_t MaxThreads, MinBlocks = 0; + if (!checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), MaxThreads, 1)) + return; + if (Attr.getNumArgs() > 1 && !checkUInt32Argument(S, Attr, + Attr.getArgAsExpr(1), + MinBlocks, 2)) + return; + + D->addAttr(::new (S.Context) + CUDALaunchBoundsAttr(Attr.getRange(), S.Context, + MaxThreads, MinBlocks, + Attr.getAttributeSpellingListIndex())); +} + +static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!Attr.isArgIdent(0)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << /* arg num = */ 1 << AANT_ArgumentIdentifier; + return; + } + + if (!checkAttributeNumArgs(S, Attr, 3)) + return; + + IdentifierInfo *ArgumentKind = Attr.getArgAsIdent(0)->Ident; + + if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + uint64_t ArgumentIdx; + if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 2, Attr.getArgAsExpr(1), + ArgumentIdx)) + return; + + uint64_t TypeTagIdx; + if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 3, Attr.getArgAsExpr(2), + TypeTagIdx)) + return; + + bool IsPointer = (Attr.getName()->getName() == "pointer_with_type_tag"); + if (IsPointer) { + // Ensure that buffer has a pointer type. + QualType BufferTy = getFunctionOrMethodParamType(D, ArgumentIdx); + if (!BufferTy->isPointerType()) { + S.Diag(Attr.getLoc(), diag::err_attribute_pointers_only) + << Attr.getName(); + } + } + + D->addAttr(::new (S.Context) + ArgumentWithTypeTagAttr(Attr.getRange(), S.Context, ArgumentKind, + ArgumentIdx, TypeTagIdx, IsPointer, + Attr.getAttributeSpellingListIndex())); +} + +static void handleTypeTagForDatatypeAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!Attr.isArgIdent(0)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 1 << AANT_ArgumentIdentifier; + return; + } + + if (!checkAttributeNumArgs(S, Attr, 1)) + return; + + if (!isa<VarDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariable; + return; + } + + IdentifierInfo *PointerKind = Attr.getArgAsIdent(0)->Ident; + TypeSourceInfo *MatchingCTypeLoc = nullptr; + S.GetTypeFromParser(Attr.getMatchingCType(), &MatchingCTypeLoc); + assert(MatchingCTypeLoc && "no type source info for attribute argument"); + + D->addAttr(::new (S.Context) + TypeTagForDatatypeAttr(Attr.getRange(), S.Context, PointerKind, + MatchingCTypeLoc, + Attr.getLayoutCompatible(), + Attr.getMustBeNull(), + Attr.getAttributeSpellingListIndex())); +} + +//===----------------------------------------------------------------------===// +// Checker-specific attribute handlers. +//===----------------------------------------------------------------------===// + +static bool isValidSubjectOfNSReturnsRetainedAttribute(QualType type) { + return type->isDependentType() || + type->isObjCRetainableType(); +} + +static bool isValidSubjectOfNSAttribute(Sema &S, QualType type) { + return type->isDependentType() || + type->isObjCObjectPointerType() || + S.Context.isObjCNSObjectType(type); +} +static bool isValidSubjectOfCFAttribute(Sema &S, QualType type) { + return type->isDependentType() || + type->isPointerType() || + isValidSubjectOfNSAttribute(S, type); +} + +static void handleNSConsumedAttr(Sema &S, Decl *D, const AttributeList &Attr) { + ParmVarDecl *param = cast<ParmVarDecl>(D); + bool typeOK, cf; + + if (Attr.getKind() == AttributeList::AT_NSConsumed) { + typeOK = isValidSubjectOfNSAttribute(S, param->getType()); + cf = false; + } else { + typeOK = isValidSubjectOfCFAttribute(S, param->getType()); + cf = true; + } + + if (!typeOK) { + S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type) + << Attr.getRange() << Attr.getName() << cf; + return; + } + + if (cf) + param->addAttr(::new (S.Context) + CFConsumedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + else + param->addAttr(::new (S.Context) + NSConsumedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNSReturnsRetainedAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + + QualType returnType; + + if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) + returnType = MD->getReturnType(); + else if (S.getLangOpts().ObjCAutoRefCount && hasDeclarator(D) && + (Attr.getKind() == AttributeList::AT_NSReturnsRetained)) + return; // ignore: was handled as a type attribute + else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) + returnType = PD->getType(); + else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) + returnType = FD->getReturnType(); + else { + S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type) + << Attr.getRange() << Attr.getName() + << ExpectedFunctionOrMethod; + return; + } + + bool typeOK; + bool cf; + switch (Attr.getKind()) { + default: llvm_unreachable("invalid ownership attribute"); + case AttributeList::AT_NSReturnsRetained: + typeOK = isValidSubjectOfNSReturnsRetainedAttribute(returnType); + cf = false; + break; + + case AttributeList::AT_NSReturnsAutoreleased: + case AttributeList::AT_NSReturnsNotRetained: + typeOK = isValidSubjectOfNSAttribute(S, returnType); + cf = false; + break; + + case AttributeList::AT_CFReturnsRetained: + case AttributeList::AT_CFReturnsNotRetained: + typeOK = isValidSubjectOfCFAttribute(S, returnType); + cf = true; + break; + } + + if (!typeOK) { + S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type) + << Attr.getRange() << Attr.getName() << isa<ObjCMethodDecl>(D) << cf; + return; + } + + switch (Attr.getKind()) { + default: + llvm_unreachable("invalid ownership attribute"); + case AttributeList::AT_NSReturnsAutoreleased: + D->addAttr(::new (S.Context) + NSReturnsAutoreleasedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_CFReturnsNotRetained: + D->addAttr(::new (S.Context) + CFReturnsNotRetainedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_NSReturnsNotRetained: + D->addAttr(::new (S.Context) + NSReturnsNotRetainedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_CFReturnsRetained: + D->addAttr(::new (S.Context) + CFReturnsRetainedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + case AttributeList::AT_NSReturnsRetained: + D->addAttr(::new (S.Context) + NSReturnsRetainedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + }; +} + +static void handleObjCReturnsInnerPointerAttr(Sema &S, Decl *D, + const AttributeList &attr) { + const int EP_ObjCMethod = 1; + const int EP_ObjCProperty = 2; + + SourceLocation loc = attr.getLoc(); + QualType resultType; + if (isa<ObjCMethodDecl>(D)) + resultType = cast<ObjCMethodDecl>(D)->getReturnType(); + else + resultType = cast<ObjCPropertyDecl>(D)->getType(); + + if (!resultType->isReferenceType() && + (!resultType->isPointerType() || resultType->isObjCRetainableType())) { + S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type) + << SourceRange(loc) + << attr.getName() + << (isa<ObjCMethodDecl>(D) ? EP_ObjCMethod : EP_ObjCProperty) + << /*non-retainable pointer*/ 2; + + // Drop the attribute. + return; + } + + D->addAttr(::new (S.Context) + ObjCReturnsInnerPointerAttr(attr.getRange(), S.Context, + attr.getAttributeSpellingListIndex())); +} + +static void handleObjCRequiresSuperAttr(Sema &S, Decl *D, + const AttributeList &attr) { + ObjCMethodDecl *method = cast<ObjCMethodDecl>(D); + + DeclContext *DC = method->getDeclContext(); + if (const ObjCProtocolDecl *PDecl = dyn_cast_or_null<ObjCProtocolDecl>(DC)) { + S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol) + << attr.getName() << 0; + S.Diag(PDecl->getLocation(), diag::note_protocol_decl); + return; + } + if (method->getMethodFamily() == OMF_dealloc) { + S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol) + << attr.getName() << 1; + return; + } + + method->addAttr(::new (S.Context) + ObjCRequiresSuperAttr(attr.getRange(), S.Context, + attr.getAttributeSpellingListIndex())); +} + +static void handleCFAuditedTransferAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (checkAttrMutualExclusion<CFUnknownTransferAttr>(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) + CFAuditedTransferAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleCFUnknownTransferAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (checkAttrMutualExclusion<CFAuditedTransferAttr>(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) + CFUnknownTransferAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCBridgeAttr(Sema &S, Scope *Sc, Decl *D, + const AttributeList &Attr) { + IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr; + + if (!Parm) { + S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0; + return; + } + + D->addAttr(::new (S.Context) + ObjCBridgeAttr(Attr.getRange(), S.Context, Parm->Ident, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCBridgeMutableAttr(Sema &S, Scope *Sc, Decl *D, + const AttributeList &Attr) { + IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr; + + if (!Parm) { + S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0; + return; + } + + D->addAttr(::new (S.Context) + ObjCBridgeMutableAttr(Attr.getRange(), S.Context, Parm->Ident, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCBridgeRelatedAttr(Sema &S, Scope *Sc, Decl *D, + const AttributeList &Attr) { + IdentifierInfo *RelatedClass = + Attr.isArgIdent(0) ? Attr.getArgAsIdent(0)->Ident : nullptr; + if (!RelatedClass) { + S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0; + return; + } + IdentifierInfo *ClassMethod = + Attr.getArgAsIdent(1) ? Attr.getArgAsIdent(1)->Ident : nullptr; + IdentifierInfo *InstanceMethod = + Attr.getArgAsIdent(2) ? Attr.getArgAsIdent(2)->Ident : nullptr; + D->addAttr(::new (S.Context) + ObjCBridgeRelatedAttr(Attr.getRange(), S.Context, RelatedClass, + ClassMethod, InstanceMethod, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCDesignatedInitializer(Sema &S, Decl *D, + const AttributeList &Attr) { + ObjCInterfaceDecl *IFace; + if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(D->getDeclContext())) + IFace = CatDecl->getClassInterface(); + else + IFace = cast<ObjCInterfaceDecl>(D->getDeclContext()); + IFace->setHasDesignatedInitializers(); + D->addAttr(::new (S.Context) + ObjCDesignatedInitializerAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCRuntimeName(Sema &S, Decl *D, + const AttributeList &Attr) { + StringRef MetaDataName; + if (!S.checkStringLiteralArgumentAttr(Attr, 0, MetaDataName)) + return; + D->addAttr(::new (S.Context) + ObjCRuntimeNameAttr(Attr.getRange(), S.Context, + MetaDataName, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCOwnershipAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (hasDeclarator(D)) return; + + S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) + << Attr.getRange() << Attr.getName() << ExpectedVariable; +} + +static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + ValueDecl *vd = cast<ValueDecl>(D); + QualType type = vd->getType(); + + if (!type->isDependentType() && + !type->isObjCLifetimeType()) { + S.Diag(Attr.getLoc(), diag::err_objc_precise_lifetime_bad_type) + << type; + return; + } + + Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); + + // If we have no lifetime yet, check the lifetime we're presumably + // going to infer. + if (lifetime == Qualifiers::OCL_None && !type->isDependentType()) + lifetime = type->getObjCARCImplicitLifetime(); + + switch (lifetime) { + case Qualifiers::OCL_None: + assert(type->isDependentType() && + "didn't infer lifetime for non-dependent type?"); + break; + + case Qualifiers::OCL_Weak: // meaningful + case Qualifiers::OCL_Strong: // meaningful + break; + + case Qualifiers::OCL_ExplicitNone: + case Qualifiers::OCL_Autoreleasing: + S.Diag(Attr.getLoc(), diag::warn_objc_precise_lifetime_meaningless) + << (lifetime == Qualifiers::OCL_Autoreleasing); + break; + } + + D->addAttr(::new (S.Context) + ObjCPreciseLifetimeAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +//===----------------------------------------------------------------------===// +// Microsoft specific attribute handlers. +//===----------------------------------------------------------------------===// + +static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!S.LangOpts.CPlusPlus) { + S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang) + << Attr.getName() << AttributeLangSupport::C; + return; + } + + if (!isa<CXXRecordDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedClass; + return; + } + + StringRef StrRef; + SourceLocation LiteralLoc; + if (!S.checkStringLiteralArgumentAttr(Attr, 0, StrRef, &LiteralLoc)) + return; + + // GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or + // "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}", normalize to the former. + if (StrRef.size() == 38 && StrRef.front() == '{' && StrRef.back() == '}') + StrRef = StrRef.drop_front().drop_back(); + + // Validate GUID length. + if (StrRef.size() != 36) { + S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid); + return; + } + + for (unsigned i = 0; i < 36; ++i) { + if (i == 8 || i == 13 || i == 18 || i == 23) { + if (StrRef[i] != '-') { + S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid); + return; + } + } else if (!isHexDigit(StrRef[i])) { + S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid); + return; + } + } + + D->addAttr(::new (S.Context) UuidAttr(Attr.getRange(), S.Context, StrRef, + Attr.getAttributeSpellingListIndex())); +} + +static void handleMSInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!S.LangOpts.CPlusPlus) { + S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang) + << Attr.getName() << AttributeLangSupport::C; + return; + } + MSInheritanceAttr *IA = S.mergeMSInheritanceAttr( + D, Attr.getRange(), /*BestCase=*/true, + Attr.getAttributeSpellingListIndex(), + (MSInheritanceAttr::Spelling)Attr.getSemanticSpelling()); + if (IA) + D->addAttr(IA); +} + +static void handleDeclspecThreadAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + VarDecl *VD = cast<VarDecl>(D); + if (!S.Context.getTargetInfo().isTLSSupported()) { + S.Diag(Attr.getLoc(), diag::err_thread_unsupported); + return; + } + if (VD->getTSCSpec() != TSCS_unspecified) { + S.Diag(Attr.getLoc(), diag::err_declspec_thread_on_thread_variable); + return; + } + if (VD->hasLocalStorage()) { + S.Diag(Attr.getLoc(), diag::err_thread_non_global) << "__declspec(thread)"; + return; + } + VD->addAttr(::new (S.Context) ThreadAttr( + Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex())); +} + +static void handleARMInterruptAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + // Check the attribute arguments. + if (Attr.getNumArgs() > 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) + << Attr.getName() << 1; + return; + } + + StringRef Str; + SourceLocation ArgLoc; + + if (Attr.getNumArgs() == 0) + Str = ""; + else if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &ArgLoc)) + return; + + ARMInterruptAttr::InterruptType Kind; + if (!ARMInterruptAttr::ConvertStrToInterruptType(Str, Kind)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) + << Attr.getName() << Str << ArgLoc; + return; + } + + unsigned Index = Attr.getAttributeSpellingListIndex(); + D->addAttr(::new (S.Context) + ARMInterruptAttr(Attr.getLoc(), S.Context, Kind, Index)); +} + +static void handleMSP430InterruptAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkAttributeNumArgs(S, Attr, 1)) + return; + + if (!Attr.isArgExpr(0)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName() + << AANT_ArgumentIntegerConstant; + return; + } + + // FIXME: Check for decl - it should be void ()(void). + + Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0)); + llvm::APSInt NumParams(32); + if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentIntegerConstant + << NumParamsExpr->getSourceRange(); + return; + } + + unsigned Num = NumParams.getLimitedValue(255); + if ((Num & 1) || Num > 30) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) + << Attr.getName() << (int)NumParams.getSExtValue() + << NumParamsExpr->getSourceRange(); + return; + } + + D->addAttr(::new (S.Context) + MSP430InterruptAttr(Attr.getLoc(), S.Context, Num, + Attr.getAttributeSpellingListIndex())); + D->addAttr(UsedAttr::CreateImplicit(S.Context)); +} + +static void handleInterruptAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // Dispatch the interrupt attribute based on the current target. + if (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::msp430) + handleMSP430InterruptAttr(S, D, Attr); + else + handleARMInterruptAttr(S, D, Attr); +} + +static void handleX86ForceAlignArgPointerAttr(Sema &S, Decl *D, + const AttributeList& Attr) { + // If we try to apply it to a function pointer, don't warn, but don't + // do anything, either. It doesn't matter anyway, because there's nothing + // special about calling a force_align_arg_pointer function. + ValueDecl *VD = dyn_cast<ValueDecl>(D); + if (VD && VD->getType()->isFunctionPointerType()) + return; + // Also don't warn on function pointer typedefs. + TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D); + if (TD && (TD->getUnderlyingType()->isFunctionPointerType() || + TD->getUnderlyingType()->isFunctionType())) + return; + // Attribute can only be applied to function types. + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << /* function */0; + return; + } + + D->addAttr(::new (S.Context) + X86ForceAlignArgPointerAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +DLLImportAttr *Sema::mergeDLLImportAttr(Decl *D, SourceRange Range, + unsigned AttrSpellingListIndex) { + if (D->hasAttr<DLLExportAttr>()) { + Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'dllimport'"; + return nullptr; + } + + if (D->hasAttr<DLLImportAttr>()) + return nullptr; + + return ::new (Context) DLLImportAttr(Range, Context, AttrSpellingListIndex); +} + +DLLExportAttr *Sema::mergeDLLExportAttr(Decl *D, SourceRange Range, + unsigned AttrSpellingListIndex) { + if (DLLImportAttr *Import = D->getAttr<DLLImportAttr>()) { + Diag(Import->getLocation(), diag::warn_attribute_ignored) << Import; + D->dropAttr<DLLImportAttr>(); + } + + if (D->hasAttr<DLLExportAttr>()) + return nullptr; + + return ::new (Context) DLLExportAttr(Range, Context, AttrSpellingListIndex); +} + +static void handleDLLAttr(Sema &S, Decl *D, const AttributeList &A) { + if (isa<ClassTemplatePartialSpecializationDecl>(D) && + S.Context.getTargetInfo().getCXXABI().isMicrosoft()) { + S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored) + << A.getName(); + return; + } + + unsigned Index = A.getAttributeSpellingListIndex(); + Attr *NewAttr = A.getKind() == AttributeList::AT_DLLExport + ? (Attr *)S.mergeDLLExportAttr(D, A.getRange(), Index) + : (Attr *)S.mergeDLLImportAttr(D, A.getRange(), Index); + if (NewAttr) + D->addAttr(NewAttr); +} + +MSInheritanceAttr * +Sema::mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase, + unsigned AttrSpellingListIndex, + MSInheritanceAttr::Spelling SemanticSpelling) { + if (MSInheritanceAttr *IA = D->getAttr<MSInheritanceAttr>()) { + if (IA->getSemanticSpelling() == SemanticSpelling) + return nullptr; + Diag(IA->getLocation(), diag::err_mismatched_ms_inheritance) + << 1 /*previous declaration*/; + Diag(Range.getBegin(), diag::note_previous_ms_inheritance); + D->dropAttr<MSInheritanceAttr>(); + } + + CXXRecordDecl *RD = cast<CXXRecordDecl>(D); + if (RD->hasDefinition()) { + if (checkMSInheritanceAttrOnDefinition(RD, Range, BestCase, + SemanticSpelling)) { + return nullptr; + } + } else { + if (isa<ClassTemplatePartialSpecializationDecl>(RD)) { + Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance) + << 1 /*partial specialization*/; + return nullptr; + } + if (RD->getDescribedClassTemplate()) { + Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance) + << 0 /*primary template*/; + return nullptr; + } + } + + return ::new (Context) + MSInheritanceAttr(Range, Context, BestCase, AttrSpellingListIndex); +} + +static void handleCapabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // The capability attributes take a single string parameter for the name of + // the capability they represent. The lockable attribute does not take any + // parameters. However, semantically, both attributes represent the same + // concept, and so they use the same semantic attribute. Eventually, the + // lockable attribute will be removed. + // + // For backward compatibility, any capability which has no specified string + // literal will be considered a "mutex." + StringRef N("mutex"); + SourceLocation LiteralLoc; + if (Attr.getKind() == AttributeList::AT_Capability && + !S.checkStringLiteralArgumentAttr(Attr, 0, N, &LiteralLoc)) + return; + + // Currently, there are only two names allowed for a capability: role and + // mutex (case insensitive). Diagnose other capability names. + if (!N.equals_lower("mutex") && !N.equals_lower("role")) + S.Diag(LiteralLoc, diag::warn_invalid_capability_name) << N; + + D->addAttr(::new (S.Context) CapabilityAttr(Attr.getRange(), S.Context, N, + Attr.getAttributeSpellingListIndex())); +} + +static void handleAssertCapabilityAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + D->addAttr(::new (S.Context) AssertCapabilityAttr(Attr.getRange(), S.Context, + Attr.getArgAsExpr(0), + Attr.getAttributeSpellingListIndex())); +} + +static void handleAcquireCapabilityAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 1> Args; + if (!checkLockFunAttrCommon(S, D, Attr, Args)) + return; + + D->addAttr(::new (S.Context) AcquireCapabilityAttr(Attr.getRange(), + S.Context, + Args.data(), Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleTryAcquireCapabilityAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 2> Args; + if (!checkTryLockFunAttrCommon(S, D, Attr, Args)) + return; + + D->addAttr(::new (S.Context) TryAcquireCapabilityAttr(Attr.getRange(), + S.Context, + Attr.getArgAsExpr(0), + Args.data(), + Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleReleaseCapabilityAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + // Check that all arguments are lockable objects. + SmallVector<Expr *, 1> Args; + checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, true); + + D->addAttr(::new (S.Context) ReleaseCapabilityAttr( + Attr.getRange(), S.Context, Args.data(), Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleRequiresCapabilityAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) + return; + + // check that all arguments are lockable objects + SmallVector<Expr*, 1> Args; + checkAttrArgsAreCapabilityObjs(S, D, Attr, Args); + if (Args.empty()) + return; + + RequiresCapabilityAttr *RCA = ::new (S.Context) + RequiresCapabilityAttr(Attr.getRange(), S.Context, Args.data(), + Args.size(), Attr.getAttributeSpellingListIndex()); + + D->addAttr(RCA); +} + +/// Handles semantic checking for features that are common to all attributes, +/// such as checking whether a parameter was properly specified, or the correct +/// number of arguments were passed, etc. +static bool handleCommonAttributeFeatures(Sema &S, Scope *scope, Decl *D, + const AttributeList &Attr) { + // Several attributes carry different semantics than the parsing requires, so + // those are opted out of the common handling. + // + // We also bail on unknown and ignored attributes because those are handled + // as part of the target-specific handling logic. + if (Attr.hasCustomParsing() || + Attr.getKind() == AttributeList::UnknownAttribute) + return false; + + // Check whether the attribute requires specific language extensions to be + // enabled. + if (!Attr.diagnoseLangOpts(S)) + return true; + + // If there are no optional arguments, then checking for the argument count + // is trivial. + if (Attr.getMinArgs() == Attr.getMaxArgs() && + !checkAttributeNumArgs(S, Attr, Attr.getMinArgs())) + return true; + + // Check whether the attribute appertains to the given subject. + if (!Attr.diagnoseAppertainsTo(S, D)) + return true; + + return false; +} + +//===----------------------------------------------------------------------===// +// Top Level Sema Entry Points +//===----------------------------------------------------------------------===// + +/// ProcessDeclAttribute - Apply the specific attribute to the specified decl if +/// the attribute applies to decls. If the attribute is a type attribute, just +/// silently ignore it if a GNU attribute. +static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D, + const AttributeList &Attr, + bool IncludeCXX11Attributes) { + if (Attr.isInvalid() || Attr.getKind() == AttributeList::IgnoredAttribute) + return; + + // Ignore C++11 attributes on declarator chunks: they appertain to the type + // instead. + if (Attr.isCXX11Attribute() && !IncludeCXX11Attributes) + return; + + // Unknown attributes are automatically warned on. Target-specific attributes + // which do not apply to the current target architecture are treated as + // though they were unknown attributes. + if (Attr.getKind() == AttributeList::UnknownAttribute || + !Attr.existsInTarget(S.Context.getTargetInfo().getTriple())) { + S.Diag(Attr.getLoc(), Attr.isDeclspecAttribute() + ? diag::warn_unhandled_ms_attribute_ignored + : diag::warn_unknown_attribute_ignored) + << Attr.getName(); + return; + } + + if (handleCommonAttributeFeatures(S, scope, D, Attr)) + return; + + switch (Attr.getKind()) { + default: + // Type attributes are handled elsewhere; silently move on. + assert(Attr.isTypeAttr() && "Non-type attribute not handled"); + break; + case AttributeList::AT_Interrupt: + handleInterruptAttr(S, D, Attr); + break; + case AttributeList::AT_X86ForceAlignArgPointer: + handleX86ForceAlignArgPointerAttr(S, D, Attr); + break; + case AttributeList::AT_DLLExport: + case AttributeList::AT_DLLImport: + handleDLLAttr(S, D, Attr); + break; + case AttributeList::AT_Mips16: + handleSimpleAttribute<Mips16Attr>(S, D, Attr); + break; + case AttributeList::AT_NoMips16: + handleSimpleAttribute<NoMips16Attr>(S, D, Attr); + break; + case AttributeList::AT_IBAction: + handleSimpleAttribute<IBActionAttr>(S, D, Attr); + break; + case AttributeList::AT_IBOutlet: + handleIBOutlet(S, D, Attr); + break; + case AttributeList::AT_IBOutletCollection: + handleIBOutletCollection(S, D, Attr); + break; + case AttributeList::AT_Alias: + handleAliasAttr(S, D, Attr); + break; + case AttributeList::AT_Aligned: + handleAlignedAttr(S, D, Attr); + break; + case AttributeList::AT_AlwaysInline: + handleAlwaysInlineAttr(S, D, Attr); + break; + case AttributeList::AT_AnalyzerNoReturn: + handleAnalyzerNoReturnAttr(S, D, Attr); + break; + case AttributeList::AT_TLSModel: + handleTLSModelAttr(S, D, Attr); + break; + case AttributeList::AT_Annotate: + handleAnnotateAttr(S, D, Attr); + break; + case AttributeList::AT_Availability: + handleAvailabilityAttr(S, D, Attr); + break; + case AttributeList::AT_CarriesDependency: + handleDependencyAttr(S, scope, D, Attr); + break; + case AttributeList::AT_Common: + handleCommonAttr(S, D, Attr); + break; + case AttributeList::AT_CUDAConstant: + handleSimpleAttribute<CUDAConstantAttr>(S, D, Attr); + break; + case AttributeList::AT_Constructor: + handleConstructorAttr(S, D, Attr); + break; + case AttributeList::AT_CXX11NoReturn: + handleSimpleAttribute<CXX11NoReturnAttr>(S, D, Attr); + break; + case AttributeList::AT_Deprecated: + handleAttrWithMessage<DeprecatedAttr>(S, D, Attr); + break; + case AttributeList::AT_Destructor: + handleDestructorAttr(S, D, Attr); + break; + case AttributeList::AT_EnableIf: + handleEnableIfAttr(S, D, Attr); + break; + case AttributeList::AT_ExtVectorType: + handleExtVectorTypeAttr(S, scope, D, Attr); + break; + case AttributeList::AT_MinSize: + handleSimpleAttribute<MinSizeAttr>(S, D, Attr); + break; + case AttributeList::AT_OptimizeNone: + handleOptimizeNoneAttr(S, D, Attr); + break; + case AttributeList::AT_Flatten: + handleSimpleAttribute<FlattenAttr>(S, D, Attr); + break; + case AttributeList::AT_Format: + handleFormatAttr(S, D, Attr); + break; + case AttributeList::AT_FormatArg: + handleFormatArgAttr(S, D, Attr); + break; + case AttributeList::AT_CUDAGlobal: + handleGlobalAttr(S, D, Attr); + break; + case AttributeList::AT_CUDADevice: + handleSimpleAttribute<CUDADeviceAttr>(S, D, Attr); + break; + case AttributeList::AT_CUDAHost: + handleSimpleAttribute<CUDAHostAttr>(S, D, Attr); + break; + case AttributeList::AT_GNUInline: + handleGNUInlineAttr(S, D, Attr); + break; + case AttributeList::AT_CUDALaunchBounds: + handleLaunchBoundsAttr(S, D, Attr); + break; + case AttributeList::AT_Malloc: + handleMallocAttr(S, D, Attr); + break; + case AttributeList::AT_MayAlias: + handleSimpleAttribute<MayAliasAttr>(S, D, Attr); + break; + case AttributeList::AT_Mode: + handleModeAttr(S, D, Attr); + break; + case AttributeList::AT_NoCommon: + handleSimpleAttribute<NoCommonAttr>(S, D, Attr); + break; + case AttributeList::AT_NoSplitStack: + handleSimpleAttribute<NoSplitStackAttr>(S, D, Attr); + break; + case AttributeList::AT_NonNull: + if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(D)) + handleNonNullAttrParameter(S, PVD, Attr); + else + handleNonNullAttr(S, D, Attr); + break; + case AttributeList::AT_ReturnsNonNull: + handleReturnsNonNullAttr(S, D, Attr); + break; + case AttributeList::AT_Overloadable: + handleSimpleAttribute<OverloadableAttr>(S, D, Attr); + break; + case AttributeList::AT_Ownership: + handleOwnershipAttr(S, D, Attr); + break; + case AttributeList::AT_Cold: + handleColdAttr(S, D, Attr); + break; + case AttributeList::AT_Hot: + handleHotAttr(S, D, Attr); + break; + case AttributeList::AT_Naked: + handleSimpleAttribute<NakedAttr>(S, D, Attr); + break; + case AttributeList::AT_NoReturn: + handleNoReturnAttr(S, D, Attr); + break; + case AttributeList::AT_NoThrow: + handleSimpleAttribute<NoThrowAttr>(S, D, Attr); + break; + case AttributeList::AT_CUDAShared: + handleSimpleAttribute<CUDASharedAttr>(S, D, Attr); + break; + case AttributeList::AT_VecReturn: + handleVecReturnAttr(S, D, Attr); + break; + + case AttributeList::AT_ObjCOwnership: + handleObjCOwnershipAttr(S, D, Attr); + break; + case AttributeList::AT_ObjCPreciseLifetime: + handleObjCPreciseLifetimeAttr(S, D, Attr); + break; + + case AttributeList::AT_ObjCReturnsInnerPointer: + handleObjCReturnsInnerPointerAttr(S, D, Attr); + break; + + case AttributeList::AT_ObjCRequiresSuper: + handleObjCRequiresSuperAttr(S, D, Attr); + break; + + case AttributeList::AT_ObjCBridge: + handleObjCBridgeAttr(S, scope, D, Attr); + break; + + case AttributeList::AT_ObjCBridgeMutable: + handleObjCBridgeMutableAttr(S, scope, D, Attr); + break; + + case AttributeList::AT_ObjCBridgeRelated: + handleObjCBridgeRelatedAttr(S, scope, D, Attr); + break; + + case AttributeList::AT_ObjCDesignatedInitializer: + handleObjCDesignatedInitializer(S, D, Attr); + break; + + case AttributeList::AT_ObjCRuntimeName: + handleObjCRuntimeName(S, D, Attr); + break; + + case AttributeList::AT_CFAuditedTransfer: + handleCFAuditedTransferAttr(S, D, Attr); + break; + case AttributeList::AT_CFUnknownTransfer: + handleCFUnknownTransferAttr(S, D, Attr); + break; + + case AttributeList::AT_CFConsumed: + case AttributeList::AT_NSConsumed: + handleNSConsumedAttr(S, D, Attr); + break; + case AttributeList::AT_NSConsumesSelf: + handleSimpleAttribute<NSConsumesSelfAttr>(S, D, Attr); + break; + + case AttributeList::AT_NSReturnsAutoreleased: + case AttributeList::AT_NSReturnsNotRetained: + case AttributeList::AT_CFReturnsNotRetained: + case AttributeList::AT_NSReturnsRetained: + case AttributeList::AT_CFReturnsRetained: + handleNSReturnsRetainedAttr(S, D, Attr); + break; + case AttributeList::AT_WorkGroupSizeHint: + handleWorkGroupSize<WorkGroupSizeHintAttr>(S, D, Attr); + break; + case AttributeList::AT_ReqdWorkGroupSize: + handleWorkGroupSize<ReqdWorkGroupSizeAttr>(S, D, Attr); + break; + case AttributeList::AT_VecTypeHint: + handleVecTypeHint(S, D, Attr); + break; + + case AttributeList::AT_InitPriority: + handleInitPriorityAttr(S, D, Attr); + break; + + case AttributeList::AT_Packed: + handlePackedAttr(S, D, Attr); + break; + case AttributeList::AT_Section: + handleSectionAttr(S, D, Attr); + break; + case AttributeList::AT_Unavailable: + handleAttrWithMessage<UnavailableAttr>(S, D, Attr); + break; + case AttributeList::AT_ArcWeakrefUnavailable: + handleSimpleAttribute<ArcWeakrefUnavailableAttr>(S, D, Attr); + break; + case AttributeList::AT_ObjCRootClass: + handleSimpleAttribute<ObjCRootClassAttr>(S, D, Attr); + break; + case AttributeList::AT_ObjCExplicitProtocolImpl: + handleObjCSuppresProtocolAttr(S, D, Attr); + break; + case AttributeList::AT_ObjCRequiresPropertyDefs: + handleSimpleAttribute<ObjCRequiresPropertyDefsAttr>(S, D, Attr); + break; + case AttributeList::AT_Unused: + handleSimpleAttribute<UnusedAttr>(S, D, Attr); + break; + case AttributeList::AT_ReturnsTwice: + handleSimpleAttribute<ReturnsTwiceAttr>(S, D, Attr); + break; + case AttributeList::AT_Used: + handleUsedAttr(S, D, Attr); + break; + case AttributeList::AT_Visibility: + handleVisibilityAttr(S, D, Attr, false); + break; + case AttributeList::AT_TypeVisibility: + handleVisibilityAttr(S, D, Attr, true); + break; + case AttributeList::AT_WarnUnused: + handleSimpleAttribute<WarnUnusedAttr>(S, D, Attr); + break; + case AttributeList::AT_WarnUnusedResult: + handleWarnUnusedResult(S, D, Attr); + break; + case AttributeList::AT_Weak: + handleSimpleAttribute<WeakAttr>(S, D, Attr); + break; + case AttributeList::AT_WeakRef: + handleWeakRefAttr(S, D, Attr); + break; + case AttributeList::AT_WeakImport: + handleWeakImportAttr(S, D, Attr); + break; + case AttributeList::AT_TransparentUnion: + handleTransparentUnionAttr(S, D, Attr); + break; + case AttributeList::AT_ObjCException: + handleSimpleAttribute<ObjCExceptionAttr>(S, D, Attr); + break; + case AttributeList::AT_ObjCMethodFamily: + handleObjCMethodFamilyAttr(S, D, Attr); + break; + case AttributeList::AT_ObjCNSObject: + handleObjCNSObject(S, D, Attr); + break; + case AttributeList::AT_Blocks: + handleBlocksAttr(S, D, Attr); + break; + case AttributeList::AT_Sentinel: + handleSentinelAttr(S, D, Attr); + break; + case AttributeList::AT_Const: + handleSimpleAttribute<ConstAttr>(S, D, Attr); + break; + case AttributeList::AT_Pure: + handleSimpleAttribute<PureAttr>(S, D, Attr); + break; + case AttributeList::AT_Cleanup: + handleCleanupAttr(S, D, Attr); + break; + case AttributeList::AT_NoDebug: + handleNoDebugAttr(S, D, Attr); + break; + case AttributeList::AT_NoDuplicate: + handleSimpleAttribute<NoDuplicateAttr>(S, D, Attr); + break; + case AttributeList::AT_NoInline: + handleSimpleAttribute<NoInlineAttr>(S, D, Attr); + break; + case AttributeList::AT_NoInstrumentFunction: // Interacts with -pg. + handleSimpleAttribute<NoInstrumentFunctionAttr>(S, D, Attr); + break; + case AttributeList::AT_StdCall: + case AttributeList::AT_CDecl: + case AttributeList::AT_FastCall: + case AttributeList::AT_ThisCall: + case AttributeList::AT_Pascal: + case AttributeList::AT_MSABI: + case AttributeList::AT_SysVABI: + case AttributeList::AT_Pcs: + case AttributeList::AT_PnaclCall: + case AttributeList::AT_IntelOclBicc: + handleCallConvAttr(S, D, Attr); + break; + case AttributeList::AT_OpenCLKernel: + handleSimpleAttribute<OpenCLKernelAttr>(S, D, Attr); + break; + case AttributeList::AT_OpenCLImageAccess: + handleSimpleAttribute<OpenCLImageAccessAttr>(S, D, Attr); + break; + + // Microsoft attributes: + case AttributeList::AT_MsStruct: + handleSimpleAttribute<MsStructAttr>(S, D, Attr); + break; + case AttributeList::AT_Uuid: + handleUuidAttr(S, D, Attr); + break; + case AttributeList::AT_MSInheritance: + handleMSInheritanceAttr(S, D, Attr); + break; + case AttributeList::AT_SelectAny: + handleSimpleAttribute<SelectAnyAttr>(S, D, Attr); + break; + case AttributeList::AT_Thread: + handleDeclspecThreadAttr(S, D, Attr); + break; + + // Thread safety attributes: + case AttributeList::AT_AssertExclusiveLock: + handleAssertExclusiveLockAttr(S, D, Attr); + break; + case AttributeList::AT_AssertSharedLock: + handleAssertSharedLockAttr(S, D, Attr); + break; + case AttributeList::AT_GuardedVar: + handleSimpleAttribute<GuardedVarAttr>(S, D, Attr); + break; + case AttributeList::AT_PtGuardedVar: + handlePtGuardedVarAttr(S, D, Attr); + break; + case AttributeList::AT_ScopedLockable: + handleSimpleAttribute<ScopedLockableAttr>(S, D, Attr); + break; + case AttributeList::AT_NoSanitizeAddress: + handleSimpleAttribute<NoSanitizeAddressAttr>(S, D, Attr); + break; + case AttributeList::AT_NoThreadSafetyAnalysis: + handleSimpleAttribute<NoThreadSafetyAnalysisAttr>(S, D, Attr); + break; + case AttributeList::AT_NoSanitizeThread: + handleSimpleAttribute<NoSanitizeThreadAttr>(S, D, Attr); + break; + case AttributeList::AT_NoSanitizeMemory: + handleSimpleAttribute<NoSanitizeMemoryAttr>(S, D, Attr); + break; + case AttributeList::AT_GuardedBy: + handleGuardedByAttr(S, D, Attr); + break; + case AttributeList::AT_PtGuardedBy: + handlePtGuardedByAttr(S, D, Attr); + break; + case AttributeList::AT_ExclusiveTrylockFunction: + handleExclusiveTrylockFunctionAttr(S, D, Attr); + break; + case AttributeList::AT_LockReturned: + handleLockReturnedAttr(S, D, Attr); + break; + case AttributeList::AT_LocksExcluded: + handleLocksExcludedAttr(S, D, Attr); + break; + case AttributeList::AT_SharedTrylockFunction: + handleSharedTrylockFunctionAttr(S, D, Attr); + break; + case AttributeList::AT_AcquiredBefore: + handleAcquiredBeforeAttr(S, D, Attr); + break; + case AttributeList::AT_AcquiredAfter: + handleAcquiredAfterAttr(S, D, Attr); + break; + + // Capability analysis attributes. + case AttributeList::AT_Capability: + case AttributeList::AT_Lockable: + handleCapabilityAttr(S, D, Attr); + break; + case AttributeList::AT_RequiresCapability: + handleRequiresCapabilityAttr(S, D, Attr); + break; + + case AttributeList::AT_AssertCapability: + handleAssertCapabilityAttr(S, D, Attr); + break; + case AttributeList::AT_AcquireCapability: + handleAcquireCapabilityAttr(S, D, Attr); + break; + case AttributeList::AT_ReleaseCapability: + handleReleaseCapabilityAttr(S, D, Attr); + break; + case AttributeList::AT_TryAcquireCapability: + handleTryAcquireCapabilityAttr(S, D, Attr); + break; + + // Consumed analysis attributes. + case AttributeList::AT_Consumable: + handleConsumableAttr(S, D, Attr); + break; + case AttributeList::AT_ConsumableAutoCast: + handleSimpleAttribute<ConsumableAutoCastAttr>(S, D, Attr); + break; + case AttributeList::AT_ConsumableSetOnRead: + handleSimpleAttribute<ConsumableSetOnReadAttr>(S, D, Attr); + break; + case AttributeList::AT_CallableWhen: + handleCallableWhenAttr(S, D, Attr); + break; + case AttributeList::AT_ParamTypestate: + handleParamTypestateAttr(S, D, Attr); + break; + case AttributeList::AT_ReturnTypestate: + handleReturnTypestateAttr(S, D, Attr); + break; + case AttributeList::AT_SetTypestate: + handleSetTypestateAttr(S, D, Attr); + break; + case AttributeList::AT_TestTypestate: + handleTestTypestateAttr(S, D, Attr); + break; + + // Type safety attributes. + case AttributeList::AT_ArgumentWithTypeTag: + handleArgumentWithTypeTagAttr(S, D, Attr); + break; + case AttributeList::AT_TypeTagForDatatype: + handleTypeTagForDatatypeAttr(S, D, Attr); + break; + } +} + +/// ProcessDeclAttributeList - Apply all the decl attributes in the specified +/// attribute list to the specified decl, ignoring any type attributes. +void Sema::ProcessDeclAttributeList(Scope *S, Decl *D, + const AttributeList *AttrList, + bool IncludeCXX11Attributes) { + for (const AttributeList* l = AttrList; l; l = l->getNext()) + ProcessDeclAttribute(*this, S, D, *l, IncludeCXX11Attributes); + + // FIXME: We should be able to handle these cases in TableGen. + // GCC accepts + // static int a9 __attribute__((weakref)); + // but that looks really pointless. We reject it. + if (D->hasAttr<WeakRefAttr>() && !D->hasAttr<AliasAttr>()) { + Diag(AttrList->getLoc(), diag::err_attribute_weakref_without_alias) + << cast<NamedDecl>(D); + D->dropAttr<WeakRefAttr>(); + return; + } + + if (!D->hasAttr<OpenCLKernelAttr>()) { + // These attributes cannot be applied to a non-kernel function. + if (Attr *A = D->getAttr<ReqdWorkGroupSizeAttr>()) { + Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A; + D->setInvalidDecl(); + } + if (Attr *A = D->getAttr<WorkGroupSizeHintAttr>()) { + Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A; + D->setInvalidDecl(); + } + if (Attr *A = D->getAttr<VecTypeHintAttr>()) { + Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A; + D->setInvalidDecl(); + } + } +} + +// Annotation attributes are the only attributes allowed after an access +// specifier. +bool Sema::ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl, + const AttributeList *AttrList) { + for (const AttributeList* l = AttrList; l; l = l->getNext()) { + if (l->getKind() == AttributeList::AT_Annotate) { + handleAnnotateAttr(*this, ASDecl, *l); + } else { + Diag(l->getLoc(), diag::err_only_annotate_after_access_spec); + return true; + } + } + + return false; +} + +/// checkUnusedDeclAttributes - Check a list of attributes to see if it +/// contains any decl attributes that we should warn about. +static void checkUnusedDeclAttributes(Sema &S, const AttributeList *A) { + for ( ; A; A = A->getNext()) { + // Only warn if the attribute is an unignored, non-type attribute. + if (A->isUsedAsTypeAttr() || A->isInvalid()) continue; + if (A->getKind() == AttributeList::IgnoredAttribute) continue; + + if (A->getKind() == AttributeList::UnknownAttribute) { + S.Diag(A->getLoc(), diag::warn_unknown_attribute_ignored) + << A->getName() << A->getRange(); + } else { + S.Diag(A->getLoc(), diag::warn_attribute_not_on_decl) + << A->getName() << A->getRange(); + } + } +} + +/// checkUnusedDeclAttributes - Given a declarator which is not being +/// used to build a declaration, complain about any decl attributes +/// which might be lying around on it. +void Sema::checkUnusedDeclAttributes(Declarator &D) { + ::checkUnusedDeclAttributes(*this, D.getDeclSpec().getAttributes().getList()); + ::checkUnusedDeclAttributes(*this, D.getAttributes()); + for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) + ::checkUnusedDeclAttributes(*this, D.getTypeObject(i).getAttrs()); +} + +/// DeclClonePragmaWeak - clone existing decl (maybe definition), +/// \#pragma weak needs a non-definition decl and source may not have one. +NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II, + SourceLocation Loc) { + assert(isa<FunctionDecl>(ND) || isa<VarDecl>(ND)); + NamedDecl *NewD = nullptr; + if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) { + FunctionDecl *NewFD; + // FIXME: Missing call to CheckFunctionDeclaration(). + // FIXME: Mangling? + // FIXME: Is the qualifier info correct? + // FIXME: Is the DeclContext correct? + NewFD = FunctionDecl::Create(FD->getASTContext(), FD->getDeclContext(), + Loc, Loc, DeclarationName(II), + FD->getType(), FD->getTypeSourceInfo(), + SC_None, false/*isInlineSpecified*/, + FD->hasPrototype(), + false/*isConstexprSpecified*/); + NewD = NewFD; + + if (FD->getQualifier()) + NewFD->setQualifierInfo(FD->getQualifierLoc()); + + // Fake up parameter variables; they are declared as if this were + // a typedef. + QualType FDTy = FD->getType(); + if (const FunctionProtoType *FT = FDTy->getAs<FunctionProtoType>()) { + SmallVector<ParmVarDecl*, 16> Params; + for (const auto &AI : FT->param_types()) { + ParmVarDecl *Param = BuildParmVarDeclForTypedef(NewFD, Loc, AI); + Param->setScopeInfo(0, Params.size()); + Params.push_back(Param); + } + NewFD->setParams(Params); + } + } else if (VarDecl *VD = dyn_cast<VarDecl>(ND)) { + NewD = VarDecl::Create(VD->getASTContext(), VD->getDeclContext(), + VD->getInnerLocStart(), VD->getLocation(), II, + VD->getType(), VD->getTypeSourceInfo(), + VD->getStorageClass()); + if (VD->getQualifier()) { + VarDecl *NewVD = cast<VarDecl>(NewD); + NewVD->setQualifierInfo(VD->getQualifierLoc()); + } + } + return NewD; +} + +/// DeclApplyPragmaWeak - A declaration (maybe definition) needs \#pragma weak +/// applied to it, possibly with an alias. +void Sema::DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W) { + if (W.getUsed()) return; // only do this once + W.setUsed(true); + if (W.getAlias()) { // clone decl, impersonate __attribute(weak,alias(...)) + IdentifierInfo *NDId = ND->getIdentifier(); + NamedDecl *NewD = DeclClonePragmaWeak(ND, W.getAlias(), W.getLocation()); + NewD->addAttr(AliasAttr::CreateImplicit(Context, NDId->getName(), + W.getLocation())); + NewD->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation())); + WeakTopLevelDecl.push_back(NewD); + // FIXME: "hideous" code from Sema::LazilyCreateBuiltin + // to insert Decl at TU scope, sorry. + DeclContext *SavedContext = CurContext; + CurContext = Context.getTranslationUnitDecl(); + NewD->setDeclContext(CurContext); + NewD->setLexicalDeclContext(CurContext); + PushOnScopeChains(NewD, S); + CurContext = SavedContext; + } else { // just add weak to existing + ND->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation())); + } +} + +void Sema::ProcessPragmaWeak(Scope *S, Decl *D) { + // It's valid to "forward-declare" #pragma weak, in which case we + // have to do this. + LoadExternalWeakUndeclaredIdentifiers(); + if (!WeakUndeclaredIdentifiers.empty()) { + NamedDecl *ND = nullptr; + if (VarDecl *VD = dyn_cast<VarDecl>(D)) + if (VD->isExternC()) + ND = VD; + if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) + if (FD->isExternC()) + ND = FD; + if (ND) { + if (IdentifierInfo *Id = ND->getIdentifier()) { + llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator I + = WeakUndeclaredIdentifiers.find(Id); + if (I != WeakUndeclaredIdentifiers.end()) { + WeakInfo W = I->second; + DeclApplyPragmaWeak(S, ND, W); + WeakUndeclaredIdentifiers[Id] = W; + } + } + } + } +} + +/// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in +/// it, apply them to D. This is a bit tricky because PD can have attributes +/// specified in many different places, and we need to find and apply them all. +void Sema::ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD) { + // Apply decl attributes from the DeclSpec if present. + if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes().getList()) + ProcessDeclAttributeList(S, D, Attrs); + + // Walk the declarator structure, applying decl attributes that were in a type + // position to the decl itself. This handles cases like: + // int *__attr__(x)** D; + // when X is a decl attribute. + for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i) + if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs()) + ProcessDeclAttributeList(S, D, Attrs, /*IncludeCXX11Attributes=*/false); + + // Finally, apply any attributes on the decl itself. + if (const AttributeList *Attrs = PD.getAttributes()) + ProcessDeclAttributeList(S, D, Attrs); +} + +/// Is the given declaration allowed to use a forbidden type? +static bool isForbiddenTypeAllowed(Sema &S, Decl *decl) { + // Private ivars are always okay. Unfortunately, people don't + // always properly make their ivars private, even in system headers. + // Plus we need to make fields okay, too. + // Function declarations in sys headers will be marked unavailable. + if (!isa<FieldDecl>(decl) && !isa<ObjCPropertyDecl>(decl) && + !isa<FunctionDecl>(decl)) + return false; + + // Require it to be declared in a system header. + return S.Context.getSourceManager().isInSystemHeader(decl->getLocation()); +} + +/// Handle a delayed forbidden-type diagnostic. +static void handleDelayedForbiddenType(Sema &S, DelayedDiagnostic &diag, + Decl *decl) { + if (decl && isForbiddenTypeAllowed(S, decl)) { + decl->addAttr(UnavailableAttr::CreateImplicit(S.Context, + "this system declaration uses an unsupported type", + diag.Loc)); + return; + } + if (S.getLangOpts().ObjCAutoRefCount) + if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(decl)) { + // FIXME: we may want to suppress diagnostics for all + // kind of forbidden type messages on unavailable functions. + if (FD->hasAttr<UnavailableAttr>() && + diag.getForbiddenTypeDiagnostic() == + diag::err_arc_array_param_no_ownership) { + diag.Triggered = true; + return; + } + } + + S.Diag(diag.Loc, diag.getForbiddenTypeDiagnostic()) + << diag.getForbiddenTypeOperand() << diag.getForbiddenTypeArgument(); + diag.Triggered = true; +} + +void Sema::PopParsingDeclaration(ParsingDeclState state, Decl *decl) { + assert(DelayedDiagnostics.getCurrentPool()); + DelayedDiagnosticPool &poppedPool = *DelayedDiagnostics.getCurrentPool(); + DelayedDiagnostics.popWithoutEmitting(state); + + // When delaying diagnostics to run in the context of a parsed + // declaration, we only want to actually emit anything if parsing + // succeeds. + if (!decl) return; + + // We emit all the active diagnostics in this pool or any of its + // parents. In general, we'll get one pool for the decl spec + // and a child pool for each declarator; in a decl group like: + // deprecated_typedef foo, *bar, baz(); + // only the declarator pops will be passed decls. This is correct; + // we really do need to consider delayed diagnostics from the decl spec + // for each of the different declarations. + const DelayedDiagnosticPool *pool = &poppedPool; + do { + for (DelayedDiagnosticPool::pool_iterator + i = pool->pool_begin(), e = pool->pool_end(); i != e; ++i) { + // This const_cast is a bit lame. Really, Triggered should be mutable. + DelayedDiagnostic &diag = const_cast<DelayedDiagnostic&>(*i); + if (diag.Triggered) + continue; + + switch (diag.Kind) { + case DelayedDiagnostic::Deprecation: + case DelayedDiagnostic::Unavailable: + // Don't bother giving deprecation/unavailable diagnostics if + // the decl is invalid. + if (!decl->isInvalidDecl()) + HandleDelayedAvailabilityCheck(diag, decl); + break; + + case DelayedDiagnostic::Access: + HandleDelayedAccessCheck(diag, decl); + break; + + case DelayedDiagnostic::ForbiddenType: + handleDelayedForbiddenType(*this, diag, decl); + break; + } + } + } while ((pool = pool->getParent())); +} + +/// Given a set of delayed diagnostics, re-emit them as if they had +/// been delayed in the current context instead of in the given pool. +/// Essentially, this just moves them to the current pool. +void Sema::redelayDiagnostics(DelayedDiagnosticPool &pool) { + DelayedDiagnosticPool *curPool = DelayedDiagnostics.getCurrentPool(); + assert(curPool && "re-emitting in undelayed context not supported"); + curPool->steal(pool); +} + +static bool isDeclDeprecated(Decl *D) { + do { + if (D->isDeprecated()) + return true; + // A category implicitly has the availability of the interface. + if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) + return CatD->getClassInterface()->isDeprecated(); + } while ((D = cast_or_null<Decl>(D->getDeclContext()))); + return false; +} + +static bool isDeclUnavailable(Decl *D) { + do { + if (D->isUnavailable()) + return true; + // A category implicitly has the availability of the interface. + if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) + return CatD->getClassInterface()->isUnavailable(); + } while ((D = cast_or_null<Decl>(D->getDeclContext()))); + return false; +} + +static void +DoEmitAvailabilityWarning(Sema &S, + DelayedDiagnostic::DDKind K, + Decl *Ctx, + const NamedDecl *D, + StringRef Message, + SourceLocation Loc, + const ObjCInterfaceDecl *UnknownObjCClass, + const ObjCPropertyDecl *ObjCProperty, + bool ObjCPropertyAccess) { + + // Diagnostics for deprecated or unavailable. + unsigned diag, diag_message, diag_fwdclass_message; + + // Matches 'diag::note_property_attribute' options. + unsigned property_note_select; + + // Matches diag::note_availability_specified_here. + unsigned available_here_select_kind; + + // Don't warn if our current context is deprecated or unavailable. + switch (K) { + case DelayedDiagnostic::Deprecation: + if (isDeclDeprecated(Ctx)) + return; + diag = !ObjCPropertyAccess ? diag::warn_deprecated + : diag::warn_property_method_deprecated; + diag_message = diag::warn_deprecated_message; + diag_fwdclass_message = diag::warn_deprecated_fwdclass_message; + property_note_select = /* deprecated */ 0; + available_here_select_kind = /* deprecated */ 2; + break; + + case DelayedDiagnostic::Unavailable: + if (isDeclUnavailable(Ctx)) + return; + diag = !ObjCPropertyAccess ? diag::err_unavailable + : diag::err_property_method_unavailable; + diag_message = diag::err_unavailable_message; + diag_fwdclass_message = diag::warn_unavailable_fwdclass_message; + property_note_select = /* unavailable */ 1; + available_here_select_kind = /* unavailable */ 0; + break; + + default: + llvm_unreachable("Neither a deprecation or unavailable kind"); + } + + DeclarationName Name = D->getDeclName(); + if (!Message.empty()) { + S.Diag(Loc, diag_message) << Name << Message; + if (ObjCProperty) + S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute) + << ObjCProperty->getDeclName() << property_note_select; + } else if (!UnknownObjCClass) { + S.Diag(Loc, diag) << Name; + if (ObjCProperty) + S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute) + << ObjCProperty->getDeclName() << property_note_select; + } else { + S.Diag(Loc, diag_fwdclass_message) << Name; + S.Diag(UnknownObjCClass->getLocation(), diag::note_forward_class); + } + + S.Diag(D->getLocation(), diag::note_availability_specified_here) + << D << available_here_select_kind; +} + +void Sema::HandleDelayedAvailabilityCheck(DelayedDiagnostic &DD, + Decl *Ctx) { + DD.Triggered = true; + DoEmitAvailabilityWarning(*this, + (DelayedDiagnostic::DDKind) DD.Kind, + Ctx, + DD.getDeprecationDecl(), + DD.getDeprecationMessage(), + DD.Loc, + DD.getUnknownObjCClass(), + DD.getObjCProperty(), false); +} + +void Sema::EmitAvailabilityWarning(AvailabilityDiagnostic AD, + NamedDecl *D, StringRef Message, + SourceLocation Loc, + const ObjCInterfaceDecl *UnknownObjCClass, + const ObjCPropertyDecl *ObjCProperty, + bool ObjCPropertyAccess) { + // Delay if we're currently parsing a declaration. + if (DelayedDiagnostics.shouldDelayDiagnostics()) { + DelayedDiagnostics.add(DelayedDiagnostic::makeAvailability(AD, Loc, D, + UnknownObjCClass, + ObjCProperty, + Message, + ObjCPropertyAccess)); + return; + } + + Decl *Ctx = cast<Decl>(getCurLexicalContext()); + DelayedDiagnostic::DDKind K; + switch (AD) { + case AD_Deprecation: + K = DelayedDiagnostic::Deprecation; + break; + case AD_Unavailable: + K = DelayedDiagnostic::Unavailable; + break; + } + + DoEmitAvailabilityWarning(*this, K, Ctx, D, Message, Loc, + UnknownObjCClass, ObjCProperty, ObjCPropertyAccess); +} |
