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Diffstat (limited to 'contrib/llvm/tools/clang/lib/Sema/SemaDeclAttr.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/Sema/SemaDeclAttr.cpp | 5287 |
1 files changed, 5287 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 000000000000..3e583862092c --- /dev/null +++ b/contrib/llvm/tools/clang/lib/Sema/SemaDeclAttr.cpp @@ -0,0 +1,5287 @@ +//===--- 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 "TargetAttributesSema.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/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; + +/// These constants match the enumerated choices of +/// warn_attribute_wrong_decl_type and err_attribute_wrong_decl_type. +enum AttributeDeclKind { + ExpectedFunction, + ExpectedUnion, + ExpectedVariableOrFunction, + ExpectedFunctionOrMethod, + ExpectedParameter, + ExpectedFunctionMethodOrBlock, + ExpectedFunctionMethodOrClass, + ExpectedFunctionMethodOrParameter, + ExpectedClass, + ExpectedVariable, + ExpectedMethod, + ExpectedVariableFunctionOrLabel, + ExpectedFieldOrGlobalVar, + ExpectedStruct, + ExpectedVariableFunctionOrTag, + ExpectedTLSVar, + ExpectedVariableOrField, + ExpectedVariableFieldOrTag, + ExpectedTypeOrNamespace, + ExpectedObjectiveCInterface, + ExpectedMethodOrProperty, + ExpectedStructOrUnion, + ExpectedStructOrUnionOrClass +}; + +//===----------------------------------------------------------------------===// +// Helper functions +//===----------------------------------------------------------------------===// + +static const FunctionType *getFunctionType(const Decl *D, + bool blocksToo = true) { + QualType Ty; + if (const ValueDecl *decl = dyn_cast<ValueDecl>(D)) + Ty = decl->getType(); + else if (const FieldDecl *decl = dyn_cast<FieldDecl>(D)) + Ty = decl->getType(); + else if (const TypedefNameDecl* decl = dyn_cast<TypedefNameDecl>(D)) + Ty = decl->getUnderlyingType(); + else + return 0; + + if (Ty->isFunctionPointerType()) + Ty = Ty->getAs<PointerType>()->getPointeeType(); + else if (blocksToo && Ty->isBlockPointerType()) + Ty = Ty->getAs<BlockPointerType>()->getPointeeType(); + + return Ty->getAs<FunctionType>(); +} + +// FIXME: We should provide an abstraction around a method or function +// to provide the following bits of information. + +/// isFunction - Return true if the given decl has function +/// type (function or function-typed variable). +static bool isFunction(const Decl *D) { + return getFunctionType(D, false) != NULL; +} + +/// 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 isFunction(D) || isa<ObjCMethodDecl>(D); +} + +/// isFunctionOrMethodOrBlock - Return true if the given decl has function +/// type (function or function-typed variable) or an Objective-C +/// method or a block. +static bool isFunctionOrMethodOrBlock(const Decl *D) { + if (isFunctionOrMethod(D)) + return true; + // check for block is more involved. + if (const VarDecl *V = dyn_cast<VarDecl>(D)) { + QualType Ty = V->getType(); + return Ty->isBlockPointerType(); + } + return isa<BlockDecl>(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 = getFunctionType(D)) + return isa<FunctionProtoType>(FnTy); + else { + assert(isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D)); + return true; + } +} + +/// getFunctionOrMethodNumArgs - Return number of function or method +/// arguments. It is an error to call this on a K&R function (use +/// hasFunctionProto first). +static unsigned getFunctionOrMethodNumArgs(const Decl *D) { + if (const FunctionType *FnTy = getFunctionType(D)) + return cast<FunctionProtoType>(FnTy)->getNumArgs(); + if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) + return BD->getNumParams(); + return cast<ObjCMethodDecl>(D)->param_size(); +} + +static QualType getFunctionOrMethodArgType(const Decl *D, unsigned Idx) { + if (const FunctionType *FnTy = getFunctionType(D)) + return cast<FunctionProtoType>(FnTy)->getArgType(Idx); + if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) + return BD->getParamDecl(Idx)->getType(); + + return cast<ObjCMethodDecl>(D)->param_begin()[Idx]->getType(); +} + +static QualType getFunctionOrMethodResultType(const Decl *D) { + if (const FunctionType *FnTy = getFunctionType(D)) + return cast<FunctionProtoType>(FnTy)->getResultType(); + return cast<ObjCMethodDecl>(D)->getResultType(); +} + +static bool isFunctionOrMethodVariadic(const Decl *D) { + if (const FunctionType *FnTy = getFunctionType(D)) { + 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) << Num; + return false; + } + + return true; +} + +/// \brief Check if IdxExpr is a valid argument index for a function or +/// instance method D. May output an error. +/// +/// \returns true if IdxExpr is a valid index. +static bool checkFunctionOrMethodArgumentIndex(Sema &S, const Decl *D, + StringRef AttrName, + SourceLocation AttrLoc, + 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 NumArgs = (HP ? getFunctionOrMethodNumArgs(D) : 0) + + HasImplicitThisParam; + + llvm::APSInt IdxInt; + if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() || + !IdxExpr->isIntegerConstantExpr(IdxInt, S.Context)) { + std::string Name = std::string("'") + AttrName.str() + std::string("'"); + S.Diag(AttrLoc, diag::err_attribute_argument_n_type) << Name.c_str() + << AttrArgNum << AANT_ArgumentIntegerConstant << IdxExpr->getSourceRange(); + return false; + } + + Idx = IdxInt.getLimitedValue(); + if (Idx < 1 || (!IV && Idx > NumArgs)) { + S.Diag(AttrLoc, diag::err_attribute_argument_out_of_bounds) + << AttrName << AttrArgNum << IdxExpr->getSourceRange(); + return false; + } + Idx--; // Convert to zero-based. + if (HasImplicitThisParam) { + if (Idx == 0) { + S.Diag(AttrLoc, + diag::err_attribute_invalid_implicit_this_argument) + << AttrName << 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 Check if passed in Decl is a field or potentially shared global var +/// \return true if the Decl is a field or potentially shared global variable +/// +static bool mayBeSharedVariable(const Decl *D) { + if (isa<FieldDecl>(D)) + return true; + if (const VarDecl *vd = dyn_cast<VarDecl>(D)) + return vd->hasGlobalStorage() && !vd->getTLSKind(); + + return false; +} + +/// \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) { + if (const ValueDecl *vd = dyn_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()->getName() << QT; + } else { + S.Diag(Attr.getLoc(), diag::err_attribute_can_be_applied_only_to_value_decl) + << Attr.getName(); + } + 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 0; +} + + +static bool checkBaseClassIsLockableCallback(const CXXBaseSpecifier *Specifier, + CXXBasePath &Path, void *Unused) { + const RecordType *RT = Specifier->getType()->getAs<RecordType>(); + if (RT->getDecl()->getAttr<LockableAttr>()) + return true; + return false; +} + + +/// \brief Thread Safety Analysis: Checks that the passed in RecordType +/// resolves to a lockable object. +static void checkForLockableRecord(Sema &S, Decl *D, const AttributeList &Attr, + QualType Ty) { + const RecordType *RT = getRecordType(Ty); + + // Warn if could not get record type for this argument. + if (!RT) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_argument_not_class) + << Attr.getName() << Ty.getAsString(); + return; + } + + // Don't check for lockable if the class hasn't been defined yet. + if (RT->isIncompleteType()) + return; + + // Allow smart pointers to be used as lockable objects. + // FIXME -- Check the type that the smart pointer points to. + if (threadSafetyCheckIsSmartPointer(S, RT)) + return; + + // Check if the type is lockable. + RecordDecl *RD = RT->getDecl(); + if (RD->getAttr<LockableAttr>()) + return; + + // Else check if any base classes are lockable. + if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { + CXXBasePaths BPaths(false, false); + if (CRD->lookupInBases(checkBaseClassIsLockableCallback, 0, BPaths)) + return; + } + + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_argument_not_lockable) + << Attr.getName() << Ty.getAsString(); +} + +/// \brief Thread Safety Analysis: Checks that all attribute arguments, starting +/// from Sidx, resolve to a lockable 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 checkAttrArgsAreLockableObjs(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 point 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(); + } + } + + checkForLockableRecord(S, D, Attr, 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). + +enum ThreadAttributeDeclKind { + ThreadExpectedFieldOrGlobalVar, + ThreadExpectedFunctionOrMethod, + ThreadExpectedClassOrStruct +}; + +static bool checkGuardedVarAttrCommon(Sema &S, Decl *D, + const AttributeList &Attr) { + // D must be either a member field or global (potentially shared) variable. + if (!mayBeSharedVariable(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFieldOrGlobalVar; + return false; + } + + return true; +} + +static void handleGuardedVarAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkGuardedVarAttrCommon(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) + GuardedVarAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handlePtGuardedVarAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkGuardedVarAttrCommon(S, D, Attr)) + return; + + 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) { + // D must be either a member field or global (potentially shared) variable. + if (!mayBeSharedVariable(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFieldOrGlobalVar; + return false; + } + + SmallVector<Expr*, 1> Args; + // check that all arguments are lockable objects + checkAttrArgsAreLockableObjs(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 = 0; + if (!checkGuardedByAttrCommon(S, D, Attr, Arg)) + return; + + D->addAttr(::new (S.Context) GuardedByAttr(Attr.getRange(), S.Context, Arg)); +} + +static void handlePtGuardedByAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + Expr *Arg = 0; + if (!checkGuardedByAttrCommon(S, D, Attr, Arg)) + return; + + if (!threadSafetyCheckIsPointer(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) PtGuardedByAttr(Attr.getRange(), + S.Context, Arg)); +} + +static bool checkLockableAttrCommon(Sema &S, Decl *D, + const AttributeList &Attr) { + // FIXME: Lockable structs for C code. + if (!isa<RecordDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedClassOrStruct; + return false; + } + + return true; +} + +static void handleLockableAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkLockableAttrCommon(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) LockableAttr(Attr.getRange(), S.Context)); +} + +static void handleScopedLockableAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!checkLockableAttrCommon(S, D, Attr)) + return; + + D->addAttr(::new (S.Context) + ScopedLockableAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNoThreadSafetyAnalysis(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFunctionOrMethod; + return; + } + + D->addAttr(::new (S.Context) NoThreadSafetyAnalysisAttr(Attr.getRange(), + S.Context)); +} + +static void handleNoSanitizeAddressAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + D->addAttr(::new (S.Context) + NoSanitizeAddressAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNoSanitizeMemory(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + D->addAttr(::new (S.Context) NoSanitizeMemoryAttr(Attr.getRange(), + S.Context)); +} + +static void handleNoSanitizeThread(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + D->addAttr(::new (S.Context) NoSanitizeThreadAttr(Attr.getRange(), + S.Context)); +} + +static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D, + const AttributeList &Attr, + SmallVectorImpl<Expr *> &Args) { + if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) + return false; + + // D must be either a member field or global (potentially shared) variable. + ValueDecl *VD = dyn_cast<ValueDecl>(D); + if (!VD || !mayBeSharedVariable(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFieldOrGlobalVar; + return false; + } + + // Check that this attribute only applies to lockable types. + QualType QT = VD->getType(); + if (!QT->isDependentType()) { + const RecordType *RT = getRecordType(QT); + if (!RT || !RT->getDecl()->getAttr<LockableAttr>()) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_lockable) + << Attr.getName(); + return false; + } + } + + // Check that all arguments are lockable objects. + checkAttrArgsAreLockableObjs(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 the attribute is applied to a function + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFunctionOrMethod; + return false; + } + + // check that all arguments are lockable objects + checkAttrArgsAreLockableObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true); + + return true; +} + +static void handleSharedLockFunctionAttr(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 ? 0 : &Args[0]; + D->addAttr(::new (S.Context) + SharedLockFunctionAttr(Attr.getRange(), S.Context, StartArg, Size, + Attr.getAttributeSpellingListIndex())); +} + +static void handleExclusiveLockFunctionAttr(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 ? 0 : &Args[0]; + D->addAttr(::new (S.Context) + ExclusiveLockFunctionAttr(Attr.getRange(), S.Context, + StartArg, Size, + Attr.getAttributeSpellingListIndex())); +} + +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 ? 0 : &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 ? 0 : &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 (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFunctionOrMethod; + 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 + checkAttrArgsAreLockableObjs(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 bool checkLocksRequiredCommon(Sema &S, Decl *D, + const AttributeList &Attr, + SmallVectorImpl<Expr *> &Args) { + if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) + return false; + + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFunctionOrMethod; + return false; + } + + // check that all arguments are lockable objects + checkAttrArgsAreLockableObjs(S, D, Attr, Args); + if (Args.empty()) + return false; + + return true; +} + +static void handleExclusiveLocksRequiredAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 1> Args; + if (!checkLocksRequiredCommon(S, D, Attr, Args)) + return; + + Expr **StartArg = &Args[0]; + D->addAttr(::new (S.Context) + ExclusiveLocksRequiredAttr(Attr.getRange(), S.Context, + StartArg, Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleSharedLocksRequiredAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + SmallVector<Expr*, 1> Args; + if (!checkLocksRequiredCommon(S, D, Attr, Args)) + return; + + Expr **StartArg = &Args[0]; + D->addAttr(::new (S.Context) + SharedLocksRequiredAttr(Attr.getRange(), S.Context, + StartArg, Args.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleUnlockFunAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + // zero or more arguments ok + + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFunctionOrMethod; + return; + } + + // check that all arguments are lockable objects + SmallVector<Expr*, 1> Args; + checkAttrArgsAreLockableObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true); + unsigned Size = Args.size(); + Expr **StartArg = Size == 0 ? 0 : &Args[0]; + + D->addAttr(::new (S.Context) + UnlockFunctionAttr(Attr.getRange(), S.Context, StartArg, Size, + Attr.getAttributeSpellingListIndex())); +} + +static void handleLockReturnedAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFunctionOrMethod; + return; + } + + // check that the argument is lockable object + SmallVector<Expr*, 1> Args; + checkAttrArgsAreLockableObjs(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; + + if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type) + << Attr.getName() << ThreadExpectedFunctionOrMethod; + return; + } + + // check that all arguments are lockable objects + SmallVector<Expr*, 1> Args; + checkAttrArgsAreLockableObjs(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 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; + } + + if (!isa<CXXRecordDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) << + Attr.getName() << ExpectedClass; + 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 (!isa<CXXMethodDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) << + Attr.getName() << ExpectedMethod; + 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; + + if (!isa<ParmVarDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) << + Attr.getName() << ExpectedParameter; + 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; + + if (!(isa<FunctionDecl>(D) || isa<ParmVarDecl>(D))) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) << + Attr.getName() << ExpectedFunctionMethodOrParameter; + 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 (!isa<CXXMethodDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) << + Attr.getName() << ExpectedMethod; + 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 (!isa<CXXMethodDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) << + Attr.getName() << ExpectedMethod; + 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) { + TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D); + if (TD == 0) { + // __attribute__((ext_vector_type(N))) can only be applied to typedefs + // and type-ids. + S.Diag(Attr.getLoc(), diag::err_typecheck_ext_vector_not_typedef); + return; + } + + // Remember this typedef decl, we will need it later for diagnostics. + S.ExtVectorDecls.push_back(TD); +} + +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)); + 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 void handleMsStructAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (RecordDecl *RD = dyn_cast<RecordDecl>(D)) + RD->addAttr(::new (S.Context) + MsStructAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + else + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); +} + +static void handleIBAction(Sema &S, Decl *D, const AttributeList &Attr) { + // The IBAction attributes only apply to instance methods. + if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) + if (MD->isInstanceMethod()) { + D->addAttr(::new (S.Context) + IBActionAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + return; + } + + S.Diag(Attr.getLoc(), diag::warn_attribute_ibaction) << 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 = 0; + 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 (RecordDecl::field_iterator it = UD->field_begin(), + itend = UD->field_end(); it != itend; ++it) { + QualType QT = it->getType(); + if (QT->isAnyPointerType() || QT->isBlockPointerType()) { + T = QT; + return; + } + } + } +} + +static void handleAllocSizeAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isFunctionOrMethod(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) + return; + + SmallVector<unsigned, 8> SizeArgs; + for (unsigned i = 0; i < Attr.getNumArgs(); ++i) { + Expr *Ex = Attr.getArgAsExpr(i); + uint64_t Idx; + if (!checkFunctionOrMethodArgumentIndex(S, D, Attr.getName()->getName(), + Attr.getLoc(), i + 1, Ex, Idx)) + return; + + // check if the function argument is of an integer type + QualType T = getFunctionOrMethodArgType(D, Idx).getNonReferenceType(); + if (!T->isIntegerType()) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentIntegerConstant + << Ex->getSourceRange(); + return; + } + SizeArgs.push_back(Idx); + } + + // check if the function returns a pointer + if (!getFunctionType(D)->getResultType()->isAnyPointerType()) { + S.Diag(Attr.getLoc(), diag::warn_ns_attribute_wrong_return_type) + << Attr.getName() << 0 /*function*/<< 1 /*pointer*/ << D->getSourceRange(); + } + + D->addAttr(::new (S.Context) + AllocSizeAttr(Attr.getRange(), S.Context, + SizeArgs.data(), SizeArgs.size(), + Attr.getAttributeSpellingListIndex())); +} + +static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) { + // GCC ignores the nonnull attribute on K&R style function prototypes, so we + // ignore it as well + if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + SmallVector<unsigned, 8> NonNullArgs; + for (unsigned i = 0; i < Attr.getNumArgs(); ++i) { + Expr *Ex = Attr.getArgAsExpr(i); + uint64_t Idx; + if (!checkFunctionOrMethodArgumentIndex(S, D, Attr.getName()->getName(), + Attr.getLoc(), i + 1, Ex, Idx)) + return; + + // Is the function argument a pointer type? + QualType T = getFunctionOrMethodArgType(D, Idx).getNonReferenceType(); + possibleTransparentUnionPointerType(T); + + if (!T->isAnyPointerType() && !T->isBlockPointerType()) { + // FIXME: Should also highlight argument in decl. + S.Diag(Attr.getLoc(), diag::warn_nonnull_pointers_only) + << "nonnull" << 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 = getFunctionOrMethodNumArgs(D); i != e; ++i) { + QualType T = getFunctionOrMethodArgType(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 const char *ownershipKindToDiagName(OwnershipAttr::OwnershipKind K) { + switch (K) { + case OwnershipAttr::Holds: return "'ownership_holds'"; + case OwnershipAttr::Takes: return "'ownership_takes'"; + case OwnershipAttr::Returns: return "'ownership_returns'"; + } + llvm_unreachable("unknown ownership"); +} + +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, and check arguments while we're at it. + OwnershipAttr::OwnershipKind K; + switch (AL.getKind()) { + case AttributeList::AT_ownership_takes: + K = OwnershipAttr::Takes; + if (AL.getNumArgs() < 2) { + S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments) << 2; + return; + } + break; + case AttributeList::AT_ownership_holds: + K = OwnershipAttr::Holds; + if (AL.getNumArgs() < 2) { + S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments) << 2; + return; + } + break; + case AttributeList::AT_ownership_returns: + K = OwnershipAttr::Returns; + + if (AL.getNumArgs() > 2) { + S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments) << 1; + return; + } + break; + default: + // This should never happen given how we are called. + llvm_unreachable("Unknown ownership attribute"); + } + + if (!isFunction(D) || !hasFunctionProto(D)) { + S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type) + << AL.getName() << ExpectedFunction; + return; + } + + StringRef Module = AL.getArgAsIdent(0)->Ident->getName(); + + // Normalize the argument, __foo__ becomes foo. + if (Module.startswith("__") && Module.endswith("__")) + Module = Module.substr(2, Module.size() - 4); + + SmallVector<unsigned, 8> OwnershipArgs; + for (unsigned i = 1; i < AL.getNumArgs(); ++i) { + Expr *Ex = AL.getArgAsExpr(i); + uint64_t Idx; + if (!checkFunctionOrMethodArgumentIndex(S, D, AL.getName()->getName(), + AL.getLoc(), i, Ex, Idx)) + return; + + // Is the function argument a pointer type? + QualType T = getFunctionOrMethodArgType(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 (specific_attr_iterator<OwnershipAttr> + i = D->specific_attr_begin<OwnershipAttr>(), + e = D->specific_attr_end<OwnershipAttr>(); i != e; ++i) { + 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() << ownershipKindToDiagName((*i)->getOwnKind()); + 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, K, 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; + } + + if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariableOrFunction; + 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->getNameAsString(); + 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 handleMinSizeAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isa<FunctionDecl>(D) && !isa<ObjCMethodDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + D->addAttr(::new (S.Context) + MinSizeAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + if (D->hasAttr<HotAttr>()) { + S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) + << Attr.getName() << "hot"; + return; + } + + D->addAttr(::new (S.Context) ColdAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + if (D->hasAttr<ColdAttr>()) { + S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) + << Attr.getName() << "cold"; + return; + } + + D->addAttr(::new (S.Context) HotAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNakedAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + D->addAttr(::new (S.Context) + NakedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleAlwaysInlineAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + D->addAttr(::new (S.Context) + AlwaysInlineAttr(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; + + if (!isa<VarDecl>(D) || !cast<VarDecl>(D)->getTLSKind()) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedTLSVar; + 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->getResultType(); + 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 handleMayAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) { + D->addAttr(::new (S.Context) + MayAliasAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNoCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (isa<VarDecl>(D)) + D->addAttr(::new (S.Context) + NoCommonAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + else + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariable; +} + +static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (S.LangOpts.CPlusPlus) { + S.Diag(Attr.getLoc(), diag::err_common_not_supported_cplusplus); + return; + } + + if (isa<VarDecl>(D)) + D->addAttr(::new (S.Context) + CommonAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + else + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariable; +} + +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 == 0 || (!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())); +} + +static void handleCXX11NoReturnAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + // C++11 [dcl.attr.noreturn]p1: + // The attribute may be applied to the declarator-id in a function + // declaration. + FunctionDecl *FD = dyn_cast<FunctionDecl>(D); + if (!FD) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + D->addAttr(::new (S.Context) + CXX11NoReturnAttr(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 (!isa<RecordDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedClass; + return; + } + + if (D->getAttr<VecReturnAttr>()) { + S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << "vecreturn"; + 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 (RecordDecl::field_iterator iter = record->field_begin(); + iter != record->field_end(); iter++) { + if ((count == 1) || !iter->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; + } + } else if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionMethodOrParameter; + return; + } + + D->addAttr(::new (S.Context) CarriesDependencyAttr( + Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleUnusedAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isa<VarDecl>(D) && !isa<ObjCIvarDecl>(D) && !isFunctionOrMethod(D) && + !isa<TypeDecl>(D) && !isa<LabelDecl>(D) && !isa<FieldDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariableFunctionOrLabel; + return; + } + + D->addAttr(::new (S.Context) + UnusedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleReturnsTwiceAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + D->addAttr(::new (S.Context) + ReturnsTwiceAttr(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) << "used"; + 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) << 1; + return; + } + + int priority = 65535; // FIXME: Do not hardcode such constants. + 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; + } + priority = Idx.getZExtValue(); + } + + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + 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) << 1; + return; + } + + int priority = 65535; // FIXME: Do not hardcode such constants. + 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; + } + priority = Idx.getZExtValue(); + } + + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + 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) << 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 handleArcWeakrefUnavailableAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + D->addAttr(::new (S.Context) + ArcWeakrefUnavailableAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCRootClassAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<ObjCInterfaceDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedObjectiveCInterface; + return; + } + + D->addAttr(::new (S.Context) + ObjCRootClassAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCRequiresPropertyDefsAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<ObjCInterfaceDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_suppress_autosynthesis); + return; + } + + D->addAttr(::new (S.Context) + ObjCRequiresPropertyDefsAttr(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 NULL; + + // 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 NULL; +} + +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 NULL; + 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 = dyn_cast<ObjCMethodDecl>(decl); + if (!method) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << ExpectedMethod; + return; + } + + 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->getResultType()->isObjCObjectPointerType()) { + S.Diag(method->getLocation(), diag::err_init_method_bad_return_type) + << method->getResultType(); + // Ignore the attribute. + return; + } + + method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getRange(), + S.Context, F)); +} + +static void handleObjCExceptionAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + ObjCInterfaceDecl *OCI = dyn_cast<ObjCInterfaceDecl>(D); + if (OCI == 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() << ExpectedObjectiveCInterface; + return; + } + + D->addAttr(::new (S.Context) + ObjCExceptionAttr(Attr.getRange(), S.Context, + 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 +handleOverloadableAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_overloadable_not_function); + return; + } + + D->addAttr(::new (S.Context) + OverloadableAttr(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) << 2; + return; + } + + unsigned sentinel = 0; + 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 = 0; + 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() ? getFunctionType(D) + : 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 handleWarnUnusedAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (RecordDecl *RD = dyn_cast<RecordDecl>(D)) + RD->addAttr(::new (S.Context) WarnUnusedAttr(Attr.getRange(), S.Context)); + else + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); +} + +static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isFunction(D) && !isa<ObjCMethodDecl>(D) && !isa<CXXRecordDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionMethodOrClass; + return; + } + + if (isFunction(D) && getFunctionType(D)->getResultType()->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->getResultType()->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 handleWeakAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D)) { + if (isa<CXXRecordDecl>(D)) { + D->addAttr(::new (S.Context) WeakAttr(Attr.getRange(), S.Context)); + return; + } + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariableOrFunction; + return; + } + + NamedDecl *nd = cast<NamedDecl>(D); + + nd->addAttr(::new (S.Context) + WeakAttr(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. +static void handleWorkGroupSize(Sema &S, Decl *D, + const AttributeList &Attr) { + unsigned WGSize[3]; + for (unsigned i = 0; i < 3; ++i) { + Expr *E = Attr.getArgAsExpr(i); + llvm::APSInt ArgNum(32); + if (E->isTypeDependent() || E->isValueDependent() || + !E->isIntegerConstantExpr(ArgNum, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentIntegerConstant + << E->getSourceRange(); + return; + } + WGSize[i] = (unsigned) ArgNum.getZExtValue(); + } + + if (Attr.getKind() == AttributeList::AT_ReqdWorkGroupSize + && D->hasAttr<ReqdWorkGroupSizeAttr>()) { + ReqdWorkGroupSizeAttr *A = D->getAttr<ReqdWorkGroupSizeAttr>(); + if (!(A->getXDim() == WGSize[0] && + A->getYDim() == WGSize[1] && + A->getZDim() == WGSize[2])) { + S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << + Attr.getName(); + } + } + + if (Attr.getKind() == AttributeList::AT_WorkGroupSizeHint + && D->hasAttr<WorkGroupSizeHintAttr>()) { + WorkGroupSizeHintAttr *A = D->getAttr<WorkGroupSizeHintAttr>(); + if (!(A->getXDim() == WGSize[0] && + A->getYDim() == WGSize[1] && + A->getZDim() == WGSize[2])) { + S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << + Attr.getName(); + } + } + + if (Attr.getKind() == AttributeList::AT_ReqdWorkGroupSize) + D->addAttr(::new (S.Context) + ReqdWorkGroupSizeAttr(Attr.getRange(), S.Context, + WGSize[0], WGSize[1], WGSize[2], + Attr.getAttributeSpellingListIndex())); + else + D->addAttr(::new (S.Context) + WorkGroupSizeHintAttr(Attr.getRange(), S.Context, + WGSize[0], WGSize[1], WGSize[2], + Attr.getAttributeSpellingListIndex())); +} + +static void handleVecTypeHint(Sema &S, Decl *D, const AttributeList &Attr) { + assert(Attr.getKind() == AttributeList::AT_VecTypeHint); + + if (!Attr.hasParsedType()) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << Attr.getName() << 1; + return; + } + + TypeSourceInfo *ParmTSI = 0; + 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 (Attr.getKind() == AttributeList::AT_VecTypeHint && + D->hasAttr<VecTypeHintAttr>()) { + 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)); +} + +SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range, + StringRef Name, + unsigned AttrSpellingListIndex) { + if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) { + if (ExistingAttr->getName() == Name) + return NULL; + Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section); + Diag(Range.getBegin(), diag::note_previous_attribute); + return NULL; + } + 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; + } + + // This attribute cannot be applied to local variables. + if (isa<VarDecl>(D) && cast<VarDecl>(D)->hasLocalStorage()) { + S.Diag(LiteralLoc, diag::err_attribute_section_local_variable); + return; + } + + unsigned Index = Attr.getAttributeSpellingListIndex(); + SectionAttr *NewAttr = S.mergeSectionAttr(D, Attr.getRange(), Str, Index); + if (NewAttr) + D->addAttr(NewAttr); +} + + +static void handleNothrowAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (NoThrowAttr *Existing = D->getAttr<NoThrowAttr>()) { + if (Existing->getLocation().isInvalid()) + Existing->setRange(Attr.getRange()); + } else { + D->addAttr(::new (S.Context) + NoThrowAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + } +} + +static void handleConstAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (ConstAttr *Existing = D->getAttr<ConstAttr>()) { + if (Existing->getLocation().isInvalid()) + Existing->setRange(Attr.getRange()); + } else { + D->addAttr(::new (S.Context) + ConstAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex() )); + } +} + +static void handlePureAttr(Sema &S, Decl *D, const AttributeList &Attr) { + D->addAttr(::new (S.Context) + PureAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) { + VarDecl *VD = dyn_cast<VarDecl>(D); + if (!VD || !VD->hasLocalStorage()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); + return; + } + + Expr *E = Attr.getArgAsExpr(0); + SourceLocation Loc = E->getExprLoc(); + FunctionDecl *FD = 0; + 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) { + if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + Expr *IdxExpr = Attr.getArgAsExpr(0); + uint64_t ArgIdx; + if (!checkFunctionOrMethodArgumentIndex(S, D, Attr.getName()->getName(), + Attr.getLoc(), 1, IdxExpr, ArgIdx)) + return; + + // make sure the format string is really a string + QualType Ty = getFunctionOrMethodArgType(D, ArgIdx); + + 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 ArgIdx returned from checkFunctionOrMethodArgumentIndex + // 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 (!isa<VarDecl>(D) || S.getCurFunctionOrMethodDecl()) { + S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr); + Attr.setInvalid(); + return; + } + QualType T = dyn_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 *priorityExpr = Attr.getArgAsExpr(0); + + llvm::APSInt priority(32); + if (priorityExpr->isTypeDependent() || priorityExpr->isValueDependent() || + !priorityExpr->isIntegerConstantExpr(priority, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentIntegerConstant + << priorityExpr->getSourceRange(); + Attr.setInvalid(); + return; + } + unsigned prioritynum = priority.getZExtValue(); + if (prioritynum < 101 || prioritynum > 65535) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range) + << priorityExpr->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 (specific_attr_iterator<FormatAttr> + i = D->specific_attr_begin<FormatAttr>(), + e = D->specific_attr_end<FormatAttr>(); + i != e ; ++i) { + FormatAttr *f = *i; + 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 NULL; + } + } + + 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; + } + + if (!isFunctionOrMethodOrBlock(D) || !hasFunctionProto(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + // In C++ the implicit 'this' function parameter also counts, and they are + // counted from one. + bool HasImplicitThisParam = isInstanceMethod(D); + unsigned NumArgs = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam; + unsigned FirstIdx = 1; + + 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) + << "format" << II->getName(); + return; + } + + // checks for the 2nd argument + Expr *IdxExpr = Attr.getArgAsExpr(1); + llvm::APSInt Idx(32); + if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() || + !IdxExpr->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 2 << AANT_ArgumentIntegerConstant + << IdxExpr->getSourceRange(); + return; + } + + if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) + << "format" << 2 << IdxExpr->getSourceRange(); + return; + } + + // FIXME: Do we need to bounds check? + unsigned ArgIdx = Idx.getZExtValue() - 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 = getFunctionOrMethodArgType(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); + llvm::APSInt FirstArg(32); + if (FirstArgExpr->isTypeDependent() || FirstArgExpr->isValueDependent() || + !FirstArgExpr->isIntegerConstantExpr(FirstArg, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 3 << AANT_ArgumentIntegerConstant + << FirstArgExpr->getSourceRange(); + 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) + << "format" << 3 << FirstArgExpr->getSourceRange(); + return; + } + + FormatAttr *NewAttr = S.mergeFormatAttr(D, Attr.getRange(), II, + Idx.getZExtValue(), + FirstArg.getZExtValue(), + 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 = 0; + 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(); + 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 (specific_attr_iterator<AnnotateAttr> + i = D->specific_attr_begin<AnnotateAttr>(), + e = D->specific_attr_end<AnnotateAttr>(); i != e; ++i) { + 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, 0, 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.isC11() ? "'_Alignas'" : "'alignas'") + << (TmpAttr.isC11() ? ExpectedVariableOrField + : ExpectedVariableFieldOrTag); + return; + } + if (DiagKind != -1) { + Diag(AttrLoc, diag::err_alignas_attribute_wrong_decl_type) + << TmpAttr.isC11() << 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; + } + + if (TmpAttr.isDeclspec()) { + // We've already verified it's a power of 2, now let's make sure it's + // 8192 or less. + if (Alignment.getZExtValue() > 8192) { + Diag(AttrLoc, diag::err_attribute_aligned_greater_than_8192) + << E->getSourceRange(); + return; + } + } + + AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, true, + ICE.take(), 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 = 0; + unsigned Align = 0; + for (specific_attr_iterator<AlignedAttr> + I = D->specific_attr_begin<AlignedAttr>(), + E = D->specific_attr_end<AlignedAttr>(); I != E; ++I) { + 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(); + } +} + +/// 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) + << "mode" << 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_unknown_machine_mode) << 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_unsupported_machine_mode) << 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 handleNoInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + D->addAttr(::new (S.Context) + NoInlineAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleNoInstrumentFunctionAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + D->addAttr(::new (S.Context) + NoInstrumentFunctionAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleConstantAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (S.LangOpts.CUDA) { + if (!isa<VarDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariable; + return; + } + + D->addAttr(::new (S.Context) + CUDAConstantAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "constant"; + } +} + +static void handleDeviceAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (S.LangOpts.CUDA) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << Attr.getName() << 0; + return; + } + + if (!isa<FunctionDecl>(D) && !isa<VarDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariableOrFunction; + return; + } + + D->addAttr(::new (S.Context) + CUDADeviceAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "device"; + } +} + +static void handleGlobalAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (S.LangOpts.CUDA) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + FunctionDecl *FD = cast<FunctionDecl>(D); + if (!FD->getResultType()->isVoidType()) { + TypeLoc TL = FD->getTypeSourceInfo()->getTypeLoc().IgnoreParens(); + if (FunctionTypeLoc FTL = TL.getAs<FunctionTypeLoc>()) { + S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return) + << FD->getType() + << FixItHint::CreateReplacement(FTL.getResultLoc().getSourceRange(), + "void"); + } else { + S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return) + << FD->getType(); + } + return; + } + + D->addAttr(::new (S.Context) + CUDAGlobalAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "global"; + } +} + +static void handleHostAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (S.LangOpts.CUDA) { + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + D->addAttr(::new (S.Context) + CUDAHostAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "host"; + } +} + +static void handleSharedAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (S.LangOpts.CUDA) { + if (!isa<VarDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedVariable; + return; + } + + D->addAttr(::new (S.Context) + CUDASharedAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "shared"; + } +} + +static void handleGNUInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) { + FunctionDecl *Fn = dyn_cast<FunctionDecl>(D); + if (Fn == 0) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunction; + return; + } + + 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"); + } +} + +static void handleOpenCLKernelAttr(Sema &S, Decl *D, const AttributeList &Attr){ + D->addAttr(::new (S.Context) OpenCLKernelAttr(Attr.getRange(), S.Context)); +} + +static void handleOpenCLImageAccessAttr(Sema &S, Decl *D, const AttributeList &Attr){ + Expr *E = Attr.getArgAsExpr(0); + llvm::APSInt ArgNum(32); + if (E->isTypeDependent() || E->isValueDependent() || + !E->isIntegerConstantExpr(ArgNum, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentIntegerConstant + << E->getSourceRange(); + return; + } + + D->addAttr(::new (S.Context) OpenCLImageAccessAttr( + Attr.getRange(), S.Context, ArgNum.getZExtValue())); +} + +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. Or, better + // move to TargetAttributesSema one day. + 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; +} + +static void handleRegparmAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (hasDeclarator(D)) return; + + unsigned numParams; + if (S.CheckRegparmAttr(Attr, numParams)) + return; + + if (!isa<ObjCMethodDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + D->addAttr(::new (S.Context) + RegparmAttr(Attr.getRange(), S.Context, numParams, + Attr.getAttributeSpellingListIndex())); +} + +/// 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; + } + + Expr *NumParamsExpr = Attr.getArgAsExpr(0); + llvm::APSInt NumParams(32); + if (NumParamsExpr->isTypeDependent() || NumParamsExpr->isValueDependent() || + !NumParamsExpr->isIntegerConstantExpr(NumParams, Context)) { + Diag(Attr.getLoc(), diag::err_attribute_argument_type) + << Attr.getName() << AANT_ArgumentIntegerConstant + << NumParamsExpr->getSourceRange(); + 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 = NumParams.getZExtValue(); + 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){ + if (S.LangOpts.CUDA) { + // 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) << 2; + return; + } + + if (!isFunctionOrMethod(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << ExpectedFunctionOrMethod; + return; + } + + Expr *MaxThreadsExpr = Attr.getArgAsExpr(0); + llvm::APSInt MaxThreads(32); + if (MaxThreadsExpr->isTypeDependent() || + MaxThreadsExpr->isValueDependent() || + !MaxThreadsExpr->isIntegerConstantExpr(MaxThreads, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 1 << AANT_ArgumentIntegerConstant + << MaxThreadsExpr->getSourceRange(); + return; + } + + llvm::APSInt MinBlocks(32); + if (Attr.getNumArgs() > 1) { + Expr *MinBlocksExpr = Attr.getArgAsExpr(1); + if (MinBlocksExpr->isTypeDependent() || + MinBlocksExpr->isValueDependent() || + !MinBlocksExpr->isIntegerConstantExpr(MinBlocks, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type) + << Attr.getName() << 2 << AANT_ArgumentIntegerConstant + << MinBlocksExpr->getSourceRange(); + return; + } + } + + D->addAttr(::new (S.Context) + CUDALaunchBoundsAttr(Attr.getRange(), S.Context, + MaxThreads.getZExtValue(), + MinBlocks.getZExtValue(), + Attr.getAttributeSpellingListIndex())); + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "launch_bounds"; + } +} + +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; + + StringRef AttrName = Attr.getName()->getName(); + 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 (!checkFunctionOrMethodArgumentIndex(S, D, AttrName, + Attr.getLoc(), 2, + Attr.getArgAsExpr(1), ArgumentIdx)) + return; + + uint64_t TypeTagIdx; + if (!checkFunctionOrMethodArgumentIndex(S, D, AttrName, + Attr.getLoc(), 3, + Attr.getArgAsExpr(2), TypeTagIdx)) + return; + + bool IsPointer = (AttrName == "pointer_with_type_tag"); + if (IsPointer) { + // Ensure that buffer has a pointer type. + QualType BufferTy = getFunctionOrMethodArgType(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; + + IdentifierInfo *PointerKind = Attr.getArgAsIdent(0)->Ident; + TypeSourceInfo *MatchingCTypeLoc = 0; + 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 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 = dyn_cast<ParmVarDecl>(D); + if (!param) { + S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type) + << Attr.getRange() << Attr.getName() << ExpectedParameter; + return; + } + + 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 handleNSConsumesSelfAttr(Sema &S, Decl *D, + const AttributeList &Attr) { + if (!isa<ObjCMethodDecl>(D)) { + S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type) + << Attr.getRange() << Attr.getName() << ExpectedMethod; + return; + } + + D->addAttr(::new (S.Context) + NSConsumesSelfAttr(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->getResultType(); + 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->getResultType(); + 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_NSReturnsAutoreleased: + case AttributeList::AT_NSReturnsRetained: + 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; + + ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(D); + + if (!method) { + ObjCPropertyDecl *property = dyn_cast<ObjCPropertyDecl>(D); + if (!property) { + S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) + << SourceRange(loc, loc) << attr.getName() << ExpectedMethodOrProperty; + return; + } + resultType = property->getType(); + } + else + // Check that the method returns a normal pointer. + resultType = method->getResultType(); + + if (!resultType->isReferenceType() && + (!resultType->isPointerType() || resultType->isObjCRetainableType())) { + S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type) + << SourceRange(loc) + << attr.getName() << (method ? 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) { + SourceLocation loc = attr.getLoc(); + ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(D); + + if (!method) { + S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) + << SourceRange(loc, loc) << attr.getName() << ExpectedMethod; + return; + } + 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())); +} + +/// Handle cf_audited_transfer and cf_unknown_transfer. +static void handleCFTransferAttr(Sema &S, Decl *D, const AttributeList &A) { + if (!isa<FunctionDecl>(D)) { + S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) + << A.getRange() << A.getName() << ExpectedFunction; + return; + } + + bool IsAudited = (A.getKind() == AttributeList::AT_CFAuditedTransfer); + + // Check whether there's a conflicting attribute already present. + Attr *Existing; + if (IsAudited) { + Existing = D->getAttr<CFUnknownTransferAttr>(); + } else { + Existing = D->getAttr<CFAuditedTransferAttr>(); + } + if (Existing) { + S.Diag(D->getLocStart(), diag::err_attributes_are_not_compatible) + << A.getName() + << (IsAudited ? "cf_unknown_transfer" : "cf_audited_transfer") + << A.getRange() << Existing->getRange(); + return; + } + + // All clear; add the attribute. + if (IsAudited) { + D->addAttr(::new (S.Context) + CFAuditedTransferAttr(A.getRange(), S.Context, + A.getAttributeSpellingListIndex())); + } else { + D->addAttr(::new (S.Context) + CFUnknownTransferAttr(A.getRange(), S.Context, + A.getAttributeSpellingListIndex())); + } +} + +static void handleNSBridgedAttr(Sema &S, Scope *Sc, Decl *D, + const AttributeList &Attr) { + RecordDecl *RD = dyn_cast<RecordDecl>(D); + if (!RD || RD->isUnion()) { + S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) + << Attr.getRange() << Attr.getName() << ExpectedStruct; + } + + IdentifierLoc *Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : 0; + + // In Objective-C, verify that the type names an Objective-C type. + // We don't want to check this outside of ObjC because people sometimes + // do crazy C declarations of Objective-C types. + if (Parm && S.getLangOpts().ObjC1) { + // Check for an existing type with this name. + LookupResult R(S, DeclarationName(Parm->Ident), Parm->Loc, + Sema::LookupOrdinaryName); + if (S.LookupName(R, Sc)) { + NamedDecl *Target = R.getFoundDecl(); + if (Target && !isa<ObjCInterfaceDecl>(Target)) { + S.Diag(D->getLocStart(), diag::err_ns_bridged_not_interface); + S.Diag(Target->getLocStart(), diag::note_declared_at); + } + } + } + + D->addAttr(::new (S.Context) + NSBridgedAttr(Attr.getRange(), S.Context, Parm ? Parm->Ident : 0, + Attr.getAttributeSpellingListIndex())); +} + +static void handleObjCBridgeAttr(Sema &S, Scope *Sc, Decl *D, + const AttributeList &Attr) { + if (!isa<RecordDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) + << Attr.getName() + << (S.getLangOpts().CPlusPlus ? ExpectedStructOrUnionOrClass + : ExpectedStructOrUnion); + return; + } + + if (Attr.getNumArgs() != 1) { + S.Diag(D->getLocStart(), diag::err_objc_bridge_not_id); + return; + } + IdentifierLoc *Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : 0; + if (!Parm) { + S.Diag(D->getLocStart(), diag::err_objc_bridge_not_id); + return; + } + + D->addAttr(::new (S.Context) + ObjCBridgeAttr(Attr.getRange(), S.Context, Parm ? Parm->Ident : 0, + 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) { + if (!isa<VarDecl>(D) && !isa<FieldDecl>(D)) { + S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) + << Attr.getRange() << Attr.getName() << ExpectedVariable; + return; + } + + 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. +//===----------------------------------------------------------------------===// + +// Check if MS extensions or some other language extensions are enabled. If +// not, issue a diagnostic that the given attribute is unused. +static bool checkMicrosoftExt(Sema &S, const AttributeList &Attr, + bool OtherExtension = false) { + if (S.LangOpts.MicrosoftExt || OtherExtension) + return true; + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); + return false; +} + +static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkMicrosoftExt(S, Attr, S.LangOpts.Borland)) + 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 handleInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkMicrosoftExt(S, Attr)) + return; + + AttributeList::Kind Kind = Attr.getKind(); + if (Kind == AttributeList::AT_SingleInheritance) + D->addAttr( + ::new (S.Context) + SingleInheritanceAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + else if (Kind == AttributeList::AT_MultipleInheritance) + D->addAttr( + ::new (S.Context) + MultipleInheritanceAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); + else if (Kind == AttributeList::AT_VirtualInheritance) + D->addAttr( + ::new (S.Context) + VirtualInheritanceAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handlePortabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkMicrosoftExt(S, Attr)) + return; + + AttributeList::Kind Kind = Attr.getKind(); + if (Kind == AttributeList::AT_Win64) + D->addAttr( + ::new (S.Context) Win64Attr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleForceInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkMicrosoftExt(S, Attr)) + return; + D->addAttr(::new (S.Context) + ForceInlineAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +static void handleSelectAnyAttr(Sema &S, Decl *D, const AttributeList &Attr) { + if (!checkMicrosoftExt(S, Attr)) + return; + // Check linkage after possibly merging declaratinos. See + // checkAttributesAfterMerging(). + D->addAttr(::new (S.Context) + SelectAnyAttr(Attr.getRange(), S.Context, + Attr.getAttributeSpellingListIndex())); +} + +/// 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 || + Attr.getKind() == AttributeList::IgnoredAttribute) + return false; + + // 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; + 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()) + return; + + // Ignore C++11 attributes on declarator chunks: they appertain to the type + // instead. + if (Attr.isCXX11Attribute() && !IncludeCXX11Attributes) + return; + + if (handleCommonAttributeFeatures(S, scope, D, Attr)) + return; + + switch (Attr.getKind()) { + case AttributeList::AT_IBAction: handleIBAction(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_AddressSpace: + case AttributeList::AT_ObjCGC: + case AttributeList::AT_VectorSize: + case AttributeList::AT_NeonVectorType: + case AttributeList::AT_NeonPolyVectorType: + case AttributeList::AT_Ptr32: + case AttributeList::AT_Ptr64: + case AttributeList::AT_SPtr: + case AttributeList::AT_UPtr: + // Ignore these, these are type attributes, handled by + // ProcessTypeAttributes. + break; + case AttributeList::AT_Alias: handleAliasAttr (S, D, Attr); break; + case AttributeList::AT_Aligned: handleAlignedAttr (S, D, Attr); break; + case AttributeList::AT_AllocSize: handleAllocSizeAttr (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:handleConstantAttr (S, D, Attr); break; + case AttributeList::AT_Constructor: handleConstructorAttr (S, D, Attr); break; + case AttributeList::AT_CXX11NoReturn: + handleCXX11NoReturnAttr(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_ExtVectorType: + handleExtVectorTypeAttr(S, scope, D, Attr); + break; + case AttributeList::AT_MinSize: + handleMinSizeAttr(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: handleDeviceAttr (S, D, Attr); break; + case AttributeList::AT_CUDAHost: handleHostAttr (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: handleMayAliasAttr (S, D, Attr); break; + case AttributeList::AT_Mode: handleModeAttr (S, D, Attr); break; + case AttributeList::AT_NoCommon: handleNoCommonAttr (S, D, Attr); break; + case AttributeList::AT_NonNull: handleNonNullAttr (S, D, Attr); break; + case AttributeList::AT_Overloadable:handleOverloadableAttr(S, D, Attr); break; + case AttributeList::AT_ownership_returns: + case AttributeList::AT_ownership_takes: + case AttributeList::AT_ownership_holds: + 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: handleNakedAttr (S, D, Attr); break; + case AttributeList::AT_NoReturn: handleNoReturnAttr (S, D, Attr); break; + case AttributeList::AT_NoThrow: handleNothrowAttr (S, D, Attr); break; + case AttributeList::AT_CUDAShared: handleSharedAttr (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_NSBridged: + handleNSBridgedAttr(S, scope, D, Attr); break; + + case AttributeList::AT_ObjCBridge: + handleObjCBridgeAttr(S, scope, D, Attr); break; + + case AttributeList::AT_CFAuditedTransfer: + case AttributeList::AT_CFUnknownTransfer: + handleCFTransferAttr(S, D, Attr); break; + + // Checker-specific. + case AttributeList::AT_CFConsumed: + case AttributeList::AT_NSConsumed: handleNSConsumedAttr (S, D, Attr); break; + case AttributeList::AT_NSConsumesSelf: + handleNSConsumesSelfAttr(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: + case AttributeList::AT_ReqdWorkGroupSize: + handleWorkGroupSize(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: + handleArcWeakrefUnavailableAttr (S, D, Attr); + break; + case AttributeList::AT_ObjCRootClass: + handleObjCRootClassAttr(S, D, Attr); + break; + case AttributeList::AT_ObjCRequiresPropertyDefs: + handleObjCRequiresPropertyDefsAttr (S, D, Attr); + break; + case AttributeList::AT_Unused: handleUnusedAttr (S, D, Attr); break; + case AttributeList::AT_ReturnsTwice: + handleReturnsTwiceAttr(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: + handleWarnUnusedAttr(S, D, Attr); + break; + case AttributeList::AT_WarnUnusedResult: handleWarnUnusedResult(S, D, Attr); + break; + case AttributeList::AT_Weak: handleWeakAttr (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: + handleObjCExceptionAttr(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: handleConstAttr (S, D, Attr); break; + case AttributeList::AT_Pure: handlePureAttr (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_NoInline: handleNoInlineAttr (S, D, Attr); break; + case AttributeList::AT_Regparm: handleRegparmAttr (S, D, Attr); break; + case AttributeList::IgnoredAttribute: + // Just ignore + break; + case AttributeList::AT_NoInstrumentFunction: // Interacts with -pg. + handleNoInstrumentFunctionAttr(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: + handleOpenCLKernelAttr(S, D, Attr); + break; + case AttributeList::AT_OpenCLImageAccess: + handleOpenCLImageAccessAttr(S, D, Attr); + break; + + // Microsoft attributes: + case AttributeList::AT_MsStruct: + handleMsStructAttr(S, D, Attr); + break; + case AttributeList::AT_Uuid: + handleUuidAttr(S, D, Attr); + break; + case AttributeList::AT_SingleInheritance: + case AttributeList::AT_MultipleInheritance: + case AttributeList::AT_VirtualInheritance: + handleInheritanceAttr(S, D, Attr); + break; + case AttributeList::AT_Win64: + handlePortabilityAttr(S, D, Attr); + break; + case AttributeList::AT_ForceInline: + handleForceInlineAttr(S, D, Attr); + break; + case AttributeList::AT_SelectAny: + handleSelectAnyAttr(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: + handleGuardedVarAttr(S, D, Attr); + break; + case AttributeList::AT_PtGuardedVar: + handlePtGuardedVarAttr(S, D, Attr); + break; + case AttributeList::AT_ScopedLockable: + handleScopedLockableAttr(S, D, Attr); + break; + case AttributeList::AT_NoSanitizeAddress: + handleNoSanitizeAddressAttr(S, D, Attr); + break; + case AttributeList::AT_NoThreadSafetyAnalysis: + handleNoThreadSafetyAnalysis(S, D, Attr); + break; + case AttributeList::AT_NoSanitizeThread: + handleNoSanitizeThread(S, D, Attr); + break; + case AttributeList::AT_NoSanitizeMemory: + handleNoSanitizeMemory(S, D, Attr); + break; + case AttributeList::AT_Lockable: + handleLockableAttr(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_ExclusiveLockFunction: + handleExclusiveLockFunctionAttr(S, D, Attr); + break; + case AttributeList::AT_ExclusiveLocksRequired: + handleExclusiveLocksRequiredAttr(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_SharedLockFunction: + handleSharedLockFunctionAttr(S, D, Attr); + break; + case AttributeList::AT_SharedLocksRequired: + handleSharedLocksRequiredAttr(S, D, Attr); + break; + case AttributeList::AT_SharedTrylockFunction: + handleSharedTrylockFunctionAttr(S, D, Attr); + break; + case AttributeList::AT_UnlockFunction: + handleUnlockFunAttr(S, D, Attr); + break; + case AttributeList::AT_AcquiredBefore: + handleAcquiredBeforeAttr(S, D, Attr); + break; + case AttributeList::AT_AcquiredAfter: + handleAcquiredAfterAttr(S, D, Attr); + break; + + // Consumed analysis attributes. + case AttributeList::AT_Consumable: + handleConsumableAttr(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; + + default: + // Ask target about the attribute. + const TargetAttributesSema &TargetAttrs = S.getTargetAttributesSema(); + if (!TargetAttrs.ProcessDeclAttribute(scope, D, Attr, S)) + S.Diag(Attr.getLoc(), Attr.isDeclspecAttribute() ? + diag::warn_unhandled_ms_attribute_ignored : + diag::warn_unknown_attribute_ignored) << Attr.getName(); + 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); + + // 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)->getNameAsString(); + D->dropAttr<WeakRefAttr>(); + return; + } +} + +// 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 = 0; + 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 (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), + AE = FT->arg_type_end(); AI != AE; ++AI) { + 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(::new (Context) AliasAttr(W.getLocation(), Context, + NDId->getName())); + NewD->addAttr(::new (Context) WeakAttr(W.getLocation(), Context)); + WeakTopLevelDecl.push_back(NewD); + // FIXME: "hideous" code from Sema::LazilyCreateBuiltin + // to insert Decl at TU scope, sorry. + DeclContext *SavedContext = CurContext; + CurContext = Context.getTranslationUnitDecl(); + PushOnScopeChains(NewD, S); + CurContext = SavedContext; + } else { // just add weak to existing + ND->addAttr(::new (Context) WeakAttr(W.getLocation(), Context)); + } +} + +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 = NULL; + 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(new (S.Context) UnavailableAttr(diag.Loc, S.Context, + "this system declaration uses an unsupported type")); + 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: + // Don't bother giving deprecation diagnostics if the decl is invalid. + if (!decl->isInvalidDecl()) + HandleDelayedDeprecationCheck(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 void +DoEmitDeprecationWarning(Sema &S, const NamedDecl *D, StringRef Message, + SourceLocation Loc, + const ObjCInterfaceDecl *UnknownObjCClass, + const ObjCPropertyDecl *ObjCPropery) { + DeclarationName Name = D->getDeclName(); + if (!Message.empty()) { + S.Diag(Loc, diag::warn_deprecated_message) << Name << Message; + S.Diag(D->getLocation(), + isa<ObjCMethodDecl>(D) ? diag::note_method_declared_at + : diag::note_previous_decl) << Name; + if (ObjCPropery) + S.Diag(ObjCPropery->getLocation(), diag::note_property_attribute) + << ObjCPropery->getDeclName() << 0; + } else if (!UnknownObjCClass) { + S.Diag(Loc, diag::warn_deprecated) << D->getDeclName(); + S.Diag(D->getLocation(), + isa<ObjCMethodDecl>(D) ? diag::note_method_declared_at + : diag::note_previous_decl) << Name; + if (ObjCPropery) + S.Diag(ObjCPropery->getLocation(), diag::note_property_attribute) + << ObjCPropery->getDeclName() << 0; + } else { + S.Diag(Loc, diag::warn_deprecated_fwdclass_message) << Name; + S.Diag(UnknownObjCClass->getLocation(), diag::note_forward_class); + } +} + +void Sema::HandleDelayedDeprecationCheck(DelayedDiagnostic &DD, + Decl *Ctx) { + if (isDeclDeprecated(Ctx)) + return; + + DD.Triggered = true; + DoEmitDeprecationWarning(*this, DD.getDeprecationDecl(), + DD.getDeprecationMessage(), DD.Loc, + DD.getUnknownObjCClass(), + DD.getObjCProperty()); +} + +void Sema::EmitDeprecationWarning(NamedDecl *D, StringRef Message, + SourceLocation Loc, + const ObjCInterfaceDecl *UnknownObjCClass, + const ObjCPropertyDecl *ObjCProperty) { + // Delay if we're currently parsing a declaration. + if (DelayedDiagnostics.shouldDelayDiagnostics()) { + DelayedDiagnostics.add(DelayedDiagnostic::makeDeprecation(Loc, D, + UnknownObjCClass, + ObjCProperty, + Message)); + return; + } + + // Otherwise, don't warn if our current context is deprecated. + if (isDeclDeprecated(cast<Decl>(getCurLexicalContext()))) + return; + DoEmitDeprecationWarning(*this, D, Message, Loc, UnknownObjCClass, ObjCProperty); +} |