diff options
Diffstat (limited to 'lib/Sema/SemaDeclAttr.cpp')
| -rw-r--r-- | lib/Sema/SemaDeclAttr.cpp | 1803 |
1 files changed, 1803 insertions, 0 deletions
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp new file mode 100644 index 0000000..99b4d77 --- /dev/null +++ b/lib/Sema/SemaDeclAttr.cpp @@ -0,0 +1,1803 @@ +//===--- 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 "Sema.h" +#include "clang/AST/ASTContext.h" +#include "clang/AST/DeclObjC.h" +#include "clang/AST/Expr.h" +#include "clang/Basic/TargetInfo.h" +#include "clang/Parse/DeclSpec.h" +#include <llvm/ADT/StringExtras.h> +using namespace clang; + +//===----------------------------------------------------------------------===// +// Helper functions +//===----------------------------------------------------------------------===// + +static const FunctionType *getFunctionType(Decl *d, bool blocksToo = true) { + QualType Ty; + if (ValueDecl *decl = dyn_cast<ValueDecl>(d)) + Ty = decl->getType(); + else if (FieldDecl *decl = dyn_cast<FieldDecl>(d)) + Ty = decl->getType(); + else if (TypedefDecl* decl = dyn_cast<TypedefDecl>(d)) + Ty = decl->getUnderlyingType(); + else + return 0; + + if (Ty->isFunctionPointerType()) + Ty = Ty->getAsPointerType()->getPointeeType(); + else if (blocksToo && Ty->isBlockPointerType()) + Ty = Ty->getAsBlockPointerType()->getPointeeType(); + + return Ty->getAsFunctionType(); +} + +// FIXME: We should provide an abstraction around a method or function +// to provide the following bits of information. + +/// isFunctionOrMethod - Return true if the given decl has function +/// type (function or function-typed variable) or an Objective-C +/// method. +static bool isFunctionOrMethod(Decl *d) { + return getFunctionType(d, false) || 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(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); +} + +/// hasFunctionProto - Return true if the given decl has a argument +/// information. This decl should have already passed +/// isFunctionOrMethod or isFunctionOrMethodOrBlock. +static bool hasFunctionProto(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(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(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(Decl *d) { + if (const FunctionType *FnTy = getFunctionType(d)) + return cast<FunctionProtoType>(FnTy)->getResultType(); + return cast<ObjCMethodDecl>(d)->getResultType(); +} + +static bool isFunctionOrMethodVariadic(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 inline bool isNSStringType(QualType T, ASTContext &Ctx) { + const PointerType *PT = T->getAsPointerType(); + if (!PT) + return false; + + const ObjCInterfaceType *ClsT =PT->getPointeeType()->getAsObjCInterfaceType(); + if (!ClsT) + return false; + + IdentifierInfo* ClsName = ClsT->getDecl()->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->getAsPointerType(); + if (!PT) + return false; + + const RecordType *RT = PT->getPointeeType()->getAsRecordType(); + if (!RT) + return false; + + const RecordDecl *RD = RT->getDecl(); + if (RD->getTagKind() != TagDecl::TK_struct) + return false; + + return RD->getIdentifier() == &Ctx.Idents.get("__CFString"); +} + +//===----------------------------------------------------------------------===// +// Attribute Implementations +//===----------------------------------------------------------------------===// + +// FIXME: All this manual attribute parsing code is gross. At the +// least add some helper functions to check most argument patterns (# +// and types of args). + +static void HandleExtVectorTypeAttr(Decl *d, const AttributeList &Attr, + Sema &S) { + TypedefDecl *tDecl = dyn_cast<TypedefDecl>(d); + if (tDecl == 0) { + S.Diag(Attr.getLoc(), diag::err_typecheck_ext_vector_not_typedef); + return; + } + + QualType curType = tDecl->getUnderlyingType(); + // check the attribute arguments. + if (Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt vecSize(32); + if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) + << "ext_vector_type" << sizeExpr->getSourceRange(); + return; + } + // unlike gcc's vector_size attribute, we do not allow vectors to be defined + // in conjunction with complex types (pointers, arrays, functions, etc.). + if (!curType->isIntegerType() && !curType->isRealFloatingType()) { + S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << curType; + return; + } + // unlike gcc's vector_size attribute, the size is specified as the + // number of elements, not the number of bytes. + unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); + + if (vectorSize == 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) + << sizeExpr->getSourceRange(); + return; + } + // Instantiate/Install the vector type, the number of elements is > 0. + tDecl->setUnderlyingType(S.Context.getExtVectorType(curType, vectorSize)); + // Remember this typedef decl, we will need it later for diagnostics. + S.ExtVectorDecls.push_back(tDecl); +} + + +/// HandleVectorSizeAttribute - this attribute is only applicable to +/// integral and float scalars, although arrays, pointers, and function +/// return values are allowed in conjunction with this construct. Aggregates +/// with this attribute are invalid, even if they are of the same size as a +/// corresponding scalar. +/// The raw attribute should contain precisely 1 argument, the vector size +/// for the variable, measured in bytes. If curType and rawAttr are well +/// formed, this routine will return a new vector type. +static void HandleVectorSizeAttr(Decl *D, const AttributeList &Attr, Sema &S) { + QualType CurType; + if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) + CurType = VD->getType(); + else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) + CurType = TD->getUnderlyingType(); + else { + S.Diag(D->getLocation(), diag::err_attr_wrong_decl) + << "vector_size" << SourceRange(Attr.getLoc(), Attr.getLoc()); + return; + } + + // Check the attribute arugments. + if (Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt vecSize(32); + if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) + << "vector_size" << sizeExpr->getSourceRange(); + return; + } + // navigate to the base type - we need to provide for vector pointers, + // vector arrays, and functions returning vectors. + if (CurType->isPointerType() || CurType->isArrayType() || + CurType->isFunctionType()) { + S.Diag(Attr.getLoc(), diag::err_unsupported_vector_size) << CurType; + return; + /* FIXME: rebuild the type from the inside out, vectorizing the inner type. + do { + if (PointerType *PT = dyn_cast<PointerType>(canonType)) + canonType = PT->getPointeeType().getTypePtr(); + else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) + canonType = AT->getElementType().getTypePtr(); + else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) + canonType = FT->getResultType().getTypePtr(); + } while (canonType->isPointerType() || canonType->isArrayType() || + canonType->isFunctionType()); + */ + } + // the base type must be integer or float, and can't already be a vector. + if (CurType->isVectorType() || + (!CurType->isIntegerType() && !CurType->isRealFloatingType())) { + S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; + return; + } + unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); + // vecSize is specified in bytes - convert to bits. + unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); + + // the vector size needs to be an integral multiple of the type size. + if (vectorSize % typeSize) { + S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) + << sizeExpr->getSourceRange(); + return; + } + if (vectorSize == 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) + << sizeExpr->getSourceRange(); + return; + } + + // Success! Instantiate the vector type, the number of elements is > 0, and + // not required to be a power of 2, unlike GCC. + CurType = S.Context.getVectorType(CurType, vectorSize/typeSize); + + if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) + VD->setType(CurType); + else + cast<TypedefDecl>(D)->setUnderlyingType(CurType); +} + +static void HandlePackedAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() > 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + if (TagDecl *TD = dyn_cast<TagDecl>(d)) + TD->addAttr(::new (S.Context) PackedAttr(1)); + 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()->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(1)); + } else + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); +} + +static void HandleIBOutletAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() > 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + // The IBOutlet attribute only applies to instance variables of Objective-C + // classes. + if (isa<ObjCIvarDecl>(d) || isa<ObjCPropertyDecl>(d)) + d->addAttr(::new (S.Context) IBOutletAttr()); + else + S.Diag(Attr.getLoc(), diag::err_attribute_iboutlet); +} + +static void HandleNonNullAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // 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() << 0 /*function*/; + return; + } + + unsigned NumArgs = getFunctionOrMethodNumArgs(d); + + // The nonnull attribute only applies to pointers. + llvm::SmallVector<unsigned, 10> NonNullArgs; + + for (AttributeList::arg_iterator I=Attr.arg_begin(), + E=Attr.arg_end(); I!=E; ++I) { + + + // The argument must be an integer constant expression. + Expr *Ex = static_cast<Expr *>(*I); + llvm::APSInt ArgNum(32); + if (!Ex->isIntegerConstantExpr(ArgNum, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) + << "nonnull" << Ex->getSourceRange(); + return; + } + + unsigned x = (unsigned) ArgNum.getZExtValue(); + + if (x < 1 || x > NumArgs) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) + << "nonnull" << I.getArgNum() << Ex->getSourceRange(); + return; + } + + --x; + + // Is the function argument a pointer type? + QualType T = getFunctionOrMethodArgType(d, x); + if (!T->isPointerType() && !T->isBlockPointerType()) { + // FIXME: Should also highlight argument in decl. + S.Diag(Attr.getLoc(), diag::err_nonnull_pointers_only) + << "nonnull" << Ex->getSourceRange(); + continue; + } + + NonNullArgs.push_back(x); + } + + // 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); + if (T->isPointerType() || T->isBlockPointerType()) + NonNullArgs.push_back(I); + } + + if (NonNullArgs.empty()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers); + return; + } + } + + unsigned* start = &NonNullArgs[0]; + unsigned size = NonNullArgs.size(); + std::sort(start, start + size); + d->addAttr(::new (S.Context) NonNullAttr(start, size)); +} + +static void HandleAliasAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + Expr *Arg = static_cast<Expr*>(Attr.getArg(0)); + Arg = Arg->IgnoreParenCasts(); + StringLiteral *Str = dyn_cast<StringLiteral>(Arg); + + if (Str == 0 || Str->isWide()) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) + << "alias" << 1; + return; + } + + const char *Alias = Str->getStrData(); + unsigned AliasLen = Str->getByteLength(); + + // FIXME: check if target symbol exists in current file + + d->addAttr(::new (S.Context) AliasAttr(std::string(Alias, AliasLen))); +} + +static void HandleAlwaysInlineAttr(Decl *d, const AttributeList &Attr, + Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + if (!isa<FunctionDecl>(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + d->addAttr(::new (S.Context) AlwaysInlineAttr()); +} + +static bool HandleCommonNoReturnAttr(Decl *d, const AttributeList &Attr, + Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return false; + } + + if (!isFunctionOrMethod(d) && !isa<BlockDecl>(d)) { + ValueDecl *VD = dyn_cast<ValueDecl>(d); + if (VD == 0 || !VD->getType()->isBlockPointerType()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return false; + } + } + + return true; +} + +static void HandleNoReturnAttr(Decl *d, const AttributeList &Attr, Sema &S) { + if (HandleCommonNoReturnAttr(d, Attr, S)) + d->addAttr(::new (S.Context) NoReturnAttr()); +} + +static void HandleAnalyzerNoReturnAttr(Decl *d, const AttributeList &Attr, + Sema &S) { + if (HandleCommonNoReturnAttr(d, Attr, S)) + d->addAttr(::new (S.Context) AnalyzerNoReturnAttr()); +} + +static void HandleUnusedAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + if (!isa<VarDecl>(d) && !isFunctionOrMethod(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 2 /*variable and function*/; + return; + } + + d->addAttr(::new (S.Context) UnusedAttr()); +} + +static void HandleUsedAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + if (const VarDecl *VD = dyn_cast<VarDecl>(d)) { + if (VD->hasLocalStorage() || VD->hasExternalStorage()) { + 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() << 2 /*variable and function*/; + return; + } + + d->addAttr(::new (S.Context) UsedAttr()); +} + +static void HandleConstructorAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0 && Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << "0 or 1"; + return; + } + + int priority = 65535; // FIXME: Do not hardcode such constants. + if (Attr.getNumArgs() > 0) { + Expr *E = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt Idx(32); + if (!E->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) + << "constructor" << 1 << E->getSourceRange(); + return; + } + priority = Idx.getZExtValue(); + } + + if (!isa<FunctionDecl>(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + d->addAttr(::new (S.Context) ConstructorAttr(priority)); +} + +static void HandleDestructorAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0 && Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << "0 or 1"; + return; + } + + int priority = 65535; // FIXME: Do not hardcode such constants. + if (Attr.getNumArgs() > 0) { + Expr *E = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt Idx(32); + if (!E->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) + << "destructor" << 1 << E->getSourceRange(); + return; + } + priority = Idx.getZExtValue(); + } + + if (!isa<FunctionDecl>(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + d->addAttr(::new (S.Context) DestructorAttr(priority)); +} + +static void HandleDeprecatedAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + d->addAttr(::new (S.Context) DeprecatedAttr()); +} + +static void HandleUnavailableAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + d->addAttr(::new (S.Context) UnavailableAttr()); +} + +static void HandleVisibilityAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + Expr *Arg = static_cast<Expr*>(Attr.getArg(0)); + Arg = Arg->IgnoreParenCasts(); + StringLiteral *Str = dyn_cast<StringLiteral>(Arg); + + if (Str == 0 || Str->isWide()) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) + << "visibility" << 1; + return; + } + + const char *TypeStr = Str->getStrData(); + unsigned TypeLen = Str->getByteLength(); + VisibilityAttr::VisibilityTypes type; + + if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) + type = VisibilityAttr::DefaultVisibility; + else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) + type = VisibilityAttr::HiddenVisibility; + else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) + type = VisibilityAttr::HiddenVisibility; // FIXME + else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) + type = VisibilityAttr::ProtectedVisibility; + else { + S.Diag(Attr.getLoc(), diag::warn_attribute_unknown_visibility) << TypeStr; + return; + } + + d->addAttr(::new (S.Context) VisibilityAttr(type)); +} + +static void HandleObjCExceptionAttr(Decl *D, const AttributeList &Attr, + Sema &S) { + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + ObjCInterfaceDecl *OCI = dyn_cast<ObjCInterfaceDecl>(D); + if (OCI == 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_requires_objc_interface); + return; + } + + D->addAttr(::new (S.Context) ObjCExceptionAttr()); +} + +static void HandleObjCNSObject(Decl *D, const AttributeList &Attr, Sema &S) { + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) { + QualType T = TD->getUnderlyingType(); + if (!T->isPointerType() || + !T->getAsPointerType()->getPointeeType()->isRecordType()) { + S.Diag(TD->getLocation(), diag::err_nsobject_attribute); + return; + } + } + D->addAttr(::new (S.Context) ObjCNSObjectAttr()); +} + +static void +HandleOverloadableAttr(Decl *D, const AttributeList &Attr, Sema &S) { + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + if (!isa<FunctionDecl>(D)) { + S.Diag(Attr.getLoc(), diag::err_attribute_overloadable_not_function); + return; + } + + D->addAttr(::new (S.Context) OverloadableAttr()); +} + +static void HandleBlocksAttr(Decl *d, const AttributeList &Attr, Sema &S) { + if (!Attr.getParameterName()) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) + << "blocks" << 1; + return; + } + + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + BlocksAttr::BlocksAttrTypes type; + if (Attr.getParameterName()->isStr("byref")) + type = BlocksAttr::ByRef; + else { + S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) + << "blocks" << Attr.getParameterName(); + return; + } + + d->addAttr(::new (S.Context) BlocksAttr(type)); +} + +static void HandleSentinelAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() > 2) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) + << "0, 1 or 2"; + return; + } + + int sentinel = 0; + if (Attr.getNumArgs() > 0) { + Expr *E = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt Idx(32); + if (!E->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) + << "sentinel" << 1 << E->getSourceRange(); + return; + } + sentinel = Idx.getZExtValue(); + + if (sentinel < 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero) + << E->getSourceRange(); + return; + } + } + + int nullPos = 0; + if (Attr.getNumArgs() > 1) { + Expr *E = static_cast<Expr *>(Attr.getArg(1)); + llvm::APSInt Idx(32); + if (!E->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) + << "sentinel" << 2 << E->getSourceRange(); + return; + } + nullPos = Idx.getZExtValue(); + + if (nullPos > 1 || nullPos < 0) { + // 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()->getAsFunctionType(); + assert(FT && "FunctionDecl has non-function type?"); + + 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 (isa<BlockDecl>(d)) { + // Note! BlockDecl is typeless. Variadic diagnostics + // will be issued by the caller. + ; + } 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->getAsBlockPointerType()->getPointeeType()->getAsFunctionType(); + 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() << 6 /*function, method or block */; + return; + } + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 6 /*function, method or block */; + return; + } + d->addAttr(::new (S.Context) SentinelAttr(sentinel, nullPos)); +} + +static void HandleWarnUnusedResult(Decl *D, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + // TODO: could also be applied to methods? + FunctionDecl *Fn = dyn_cast<FunctionDecl>(D); + if (!Fn) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + Fn->addAttr(::new (S.Context) WarnUnusedResultAttr()); +} + +static void HandleWeakAttr(Decl *D, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + // TODO: could also be applied to methods? + if (!isa<FunctionDecl>(D) && !isa<VarDecl>(D)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 2 /*variable and function*/; + return; + } + + D->addAttr(::new (S.Context) WeakAttr()); +} + +static void HandleWeakImportAttr(Decl *D, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + // weak_import only applies to variable & function declarations. + bool isDef = false; + if (VarDecl *VD = dyn_cast<VarDecl>(D)) { + isDef = (!VD->hasExternalStorage() || VD->getInit()); + } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { + isDef = FD->getBody(S.Context); + } else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D)) { + // We ignore weak import on properties and methods + return; + } else { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 2 /*variable and function*/; + return; + } + + // Merge should handle any subsequent violations. + if (isDef) { + S.Diag(Attr.getLoc(), + diag::warn_attribute_weak_import_invalid_on_definition) + << "weak_import" << 2 /*variable and function*/; + return; + } + + D->addAttr(::new (S.Context) WeakImportAttr()); +} + +static void HandleDLLImportAttr(Decl *D, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + // Attribute can be applied only to functions or variables. + if (isa<VarDecl>(D)) { + D->addAttr(::new (S.Context) DLLImportAttr()); + return; + } + + FunctionDecl *FD = dyn_cast<FunctionDecl>(D); + if (!FD) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 2 /*variable and function*/; + return; + } + + // Currently, the dllimport attribute is ignored for inlined functions. + // Warning is emitted. + if (FD->isInline()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport"; + return; + } + + // The attribute is also overridden by a subsequent declaration as dllexport. + // Warning is emitted. + for (AttributeList *nextAttr = Attr.getNext(); nextAttr; + nextAttr = nextAttr->getNext()) { + if (nextAttr->getKind() == AttributeList::AT_dllexport) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport"; + return; + } + } + + if (D->getAttr<DLLExportAttr>()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport"; + return; + } + + D->addAttr(::new (S.Context) DLLImportAttr()); +} + +static void HandleDLLExportAttr(Decl *D, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + // Attribute can be applied only to functions or variables. + if (isa<VarDecl>(D)) { + D->addAttr(::new (S.Context) DLLExportAttr()); + return; + } + + FunctionDecl *FD = dyn_cast<FunctionDecl>(D); + if (!FD) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 2 /*variable and function*/; + return; + } + + // Currently, the dllexport attribute is ignored for inlined functions, + // unless the -fkeep-inline-functions flag has been used. Warning is emitted; + if (FD->isInline()) { + // FIXME: ... unless the -fkeep-inline-functions flag has been used. + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllexport"; + return; + } + + D->addAttr(::new (S.Context) DLLExportAttr()); +} + +static void HandleSectionAttr(Decl *D, const AttributeList &Attr, Sema &S) { + // Attribute has no arguments. + if (Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + // Make sure that there is a string literal as the sections's single + // argument. + StringLiteral *SE = + dyn_cast<StringLiteral>(static_cast<Expr *>(Attr.getArg(0))); + if (!SE) { + // FIXME + S.Diag(Attr.getLoc(), diag::err_attribute_annotate_no_string); + return; + } + D->addAttr(::new (S.Context) SectionAttr(std::string(SE->getStrData(), + SE->getByteLength()))); +} + +static void HandleStdCallAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // Attribute has no arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + // Attribute can be applied only to functions. + if (!isa<FunctionDecl>(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + // stdcall and fastcall attributes are mutually incompatible. + if (d->getAttr<FastCallAttr>()) { + S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) + << "stdcall" << "fastcall"; + return; + } + + d->addAttr(::new (S.Context) StdCallAttr()); +} + +static void HandleFastCallAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // Attribute has no arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + if (!isa<FunctionDecl>(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + // stdcall and fastcall attributes are mutually incompatible. + if (d->getAttr<StdCallAttr>()) { + S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) + << "fastcall" << "stdcall"; + return; + } + + d->addAttr(::new (S.Context) FastCallAttr()); +} + +static void HandleNothrowAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + d->addAttr(::new (S.Context) NoThrowAttr()); +} + +static void HandleConstAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + d->addAttr(::new (S.Context) ConstAttr()); +} + +static void HandlePureAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + d->addAttr(::new (S.Context) PureAttr()); +} + +static void HandleCleanupAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // Match gcc which ignores cleanup attrs when compiling C++. + if (S.getLangOptions().CPlusPlus) + return; + + if (!Attr.getParameterName()) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + VarDecl *VD = dyn_cast<VarDecl>(d); + + if (!VD || !VD->hasLocalStorage()) { + S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "cleanup"; + return; + } + + // Look up the function + NamedDecl *CleanupDecl = S.LookupName(S.TUScope, Attr.getParameterName(), + Sema::LookupOrdinaryName); + if (!CleanupDecl) { + S.Diag(Attr.getLoc(), diag::err_attribute_cleanup_arg_not_found) << + Attr.getParameterName(); + return; + } + + FunctionDecl *FD = dyn_cast<FunctionDecl>(CleanupDecl); + if (!FD) { + S.Diag(Attr.getLoc(), diag::err_attribute_cleanup_arg_not_function) << + Attr.getParameterName(); + return; + } + + if (FD->getNumParams() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_cleanup_func_must_take_one_arg) << + Attr.getParameterName(); + 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(ParamTy, Ty) != Sema::Compatible) { + S.Diag(Attr.getLoc(), + diag::err_attribute_cleanup_func_arg_incompatible_type) << + Attr.getParameterName() << ParamTy << Ty; + return; + } + + d->addAttr(::new (S.Context) CleanupAttr(FD)); +} + +/// Handle __attribute__((format_arg((idx)))) attribute +/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html +static void HandleFormatArgAttr(Decl *d, const AttributeList &Attr, Sema &S) { + if (Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + if (!isFunctionOrMethod(d) || !hasFunctionProto(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + // FIXME: in C++ the implicit 'this' function parameter also counts. + // this is needed in order to be compatible with GCC + // the index must start with 1. + unsigned NumArgs = getFunctionOrMethodNumArgs(d); + unsigned FirstIdx = 1; + // checks for the 2nd argument + Expr *IdxExpr = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt Idx(32); + if (!IdxExpr->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) + << "format" << 2 << 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; + } + + unsigned ArgIdx = Idx.getZExtValue() - 1; + + // 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->getAsPointerType()->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->getAsPointerType()->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; + } + + d->addAttr(::new (S.Context) FormatArgAttr(Idx.getZExtValue())); +} + +/// Handle __attribute__((format(type,idx,firstarg))) attributes +/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html +static void HandleFormatAttr(Decl *d, const AttributeList &Attr, Sema &S) { + + if (!Attr.getParameterName()) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) + << "format" << 1; + return; + } + + if (Attr.getNumArgs() != 2) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 3; + return; + } + + if (!isFunctionOrMethodOrBlock(d) || !hasFunctionProto(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + // FIXME: in C++ the implicit 'this' function parameter also counts. + // this is needed in order to be compatible with GCC + // the index must start in 1 and the limit is numargs+1 + unsigned NumArgs = getFunctionOrMethodNumArgs(d); + unsigned FirstIdx = 1; + + const char *Format = Attr.getParameterName()->getName(); + unsigned FormatLen = Attr.getParameterName()->getLength(); + + // Normalize the argument, __foo__ becomes foo. + if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && + Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { + Format += 2; + FormatLen -= 4; + } + + bool Supported = false; + bool is_NSString = false; + bool is_strftime = false; + bool is_CFString = false; + + switch (FormatLen) { + default: break; + case 5: Supported = !memcmp(Format, "scanf", 5); break; + case 6: Supported = !memcmp(Format, "printf", 6); break; + case 7: Supported = !memcmp(Format, "strfmon", 7); break; + case 8: + Supported = (is_strftime = !memcmp(Format, "strftime", 8)) || + (is_NSString = !memcmp(Format, "NSString", 8)) || + (is_CFString = !memcmp(Format, "CFString", 8)); + break; + } + + if (!Supported) { + S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) + << "format" << Attr.getParameterName()->getName(); + return; + } + + // checks for the 2nd argument + Expr *IdxExpr = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt Idx(32); + if (!IdxExpr->isIntegerConstantExpr(Idx, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) + << "format" << 2 << 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; + + // make sure the format string is really a string + QualType Ty = getFunctionOrMethodArgType(d, ArgIdx); + + if (is_CFString) { + if (!isCFStringType(Ty, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_format_attribute_not) + << "a CFString" << IdxExpr->getSourceRange(); + return; + } + } else if (is_NSString) { + // 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->getAsPointerType()->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 = static_cast<Expr *>(Attr.getArg(1)); + llvm::APSInt FirstArg(32); + if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) + << "format" << 3 << 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 (is_strftime) { + 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; + } + + d->addAttr(::new (S.Context) FormatAttr(std::string(Format, FormatLen), + Idx.getZExtValue(), FirstArg.getZExtValue())); +} + +static void HandleTransparentUnionAttr(Decl *d, const AttributeList &Attr, + Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + // Try to find the underlying union declaration. + RecordDecl *RD = 0; + TypedefDecl *TD = dyn_cast<TypedefDecl>(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() << 1 /*union*/; + return; + } + + if (!RD->isDefinition()) { + S.Diag(Attr.getLoc(), + diag::warn_transparent_union_attribute_not_definition); + return; + } + + RecordDecl::field_iterator Field = RD->field_begin(S.Context), + FieldEnd = RD->field_end(S.Context); + if (Field == FieldEnd) { + S.Diag(Attr.getLoc(), diag::warn_transparent_union_attribute_zero_fields); + return; + } + + FieldDecl *FirstField = *Field; + QualType FirstType = FirstField->getType(); + if (FirstType->isFloatingType() || FirstType->isVectorType()) { + S.Diag(FirstField->getLocation(), + diag::warn_transparent_union_attribute_floating); + 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()); +} + +static void HandleAnnotateAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + Expr *argExpr = static_cast<Expr *>(Attr.getArg(0)); + StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); + + // Make sure that there is a string literal as the annotation's single + // argument. + if (!SE) { + S.Diag(Attr.getLoc(), diag::err_attribute_annotate_no_string); + return; + } + d->addAttr(::new (S.Context) AnnotateAttr(std::string(SE->getStrData(), + SE->getByteLength()))); +} + +static void HandleAlignedAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() > 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + unsigned Align = 0; + if (Attr.getNumArgs() == 0) { + // FIXME: This should be the target specific maximum alignment. + // (For now we just use 128 bits which is the maximum on X86). + Align = 128; + d->addAttr(::new (S.Context) AlignedAttr(Align)); + return; + } + + Expr *alignmentExpr = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt Alignment(32); + if (!alignmentExpr->isIntegerConstantExpr(Alignment, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) + << "aligned" << alignmentExpr->getSourceRange(); + return; + } + if (!llvm::isPowerOf2_64(Alignment.getZExtValue())) { + S.Diag(Attr.getLoc(), diag::err_attribute_aligned_not_power_of_two) + << alignmentExpr->getSourceRange(); + return; + } + + d->addAttr(::new (S.Context) AlignedAttr(Alignment.getZExtValue() * 8)); +} + +/// 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(Decl *D, const AttributeList &Attr, Sema &S) { + // This attribute isn't documented, but glibc uses it. It changes + // the width of an int or unsigned int to the specified size. + + // Check that there aren't any arguments + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + IdentifierInfo *Name = Attr.getParameterName(); + if (!Name) { + S.Diag(Attr.getLoc(), diag::err_attribute_missing_parameter_name); + return; + } + const char *Str = Name->getName(); + unsigned Len = Name->getLength(); + + // Normalize the attribute name, __foo__ becomes foo. + if (Len > 4 && Str[0] == '_' && Str[1] == '_' && + Str[Len - 2] == '_' && Str[Len - 1] == '_') { + Str += 2; + Len -= 4; + } + + unsigned DestWidth = 0; + bool IntegerMode = true; + bool ComplexMode = false; + switch (Len) { + 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 (!memcmp(Str, "word", 4)) + DestWidth = S.Context.Target.getPointerWidth(0); + if (!memcmp(Str, "byte", 4)) + DestWidth = S.Context.Target.getCharWidth(); + break; + case 7: + if (!memcmp(Str, "pointer", 7)) + DestWidth = S.Context.Target.getPointerWidth(0); + break; + } + + QualType OldTy; + if (TypedefDecl *TD = dyn_cast<TypedefDecl>(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" << SourceRange(Attr.getLoc(), Attr.getLoc()); + return; + } + + if (!OldTy->getAsBuiltinType() && !OldTy->isComplexType()) + S.Diag(Attr.getLoc(), diag::err_mode_not_primitive); + else if (IntegerMode) { + if (!OldTy->isIntegralType()) + 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 32/64-bit integers don't get defined to types of the wrong + // width on unusual platforms. + // FIXME: Make sure floating-point mappings are accurate + // FIXME: Support XF and TF types + QualType NewTy; + switch (DestWidth) { + case 0: + S.Diag(Attr.getLoc(), diag::err_unknown_machine_mode) << Name; + return; + default: + S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; + return; + case 8: + if (!IntegerMode) { + S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; + return; + } + if (OldTy->isSignedIntegerType()) + NewTy = S.Context.SignedCharTy; + else + NewTy = S.Context.UnsignedCharTy; + break; + case 16: + if (!IntegerMode) { + S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; + return; + } + if (OldTy->isSignedIntegerType()) + NewTy = S.Context.ShortTy; + else + NewTy = S.Context.UnsignedShortTy; + break; + case 32: + if (!IntegerMode) + NewTy = S.Context.FloatTy; + else if (OldTy->isSignedIntegerType()) + NewTy = S.Context.IntTy; + else + NewTy = S.Context.UnsignedIntTy; + break; + case 64: + if (!IntegerMode) + NewTy = S.Context.DoubleTy; + else if (OldTy->isSignedIntegerType()) + NewTy = S.Context.LongLongTy; + else + NewTy = S.Context.UnsignedLongLongTy; + break; + case 96: + NewTy = S.Context.LongDoubleTy; + break; + case 128: + if (!IntegerMode) { + S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; + return; + } + NewTy = S.Context.getFixedWidthIntType(128, OldTy->isSignedIntegerType()); + break; + } + + if (ComplexMode) { + NewTy = S.Context.getComplexType(NewTy); + } + + // Install the new type. + if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) + TD->setUnderlyingType(NewTy); + else + cast<ValueDecl>(D)->setType(NewTy); +} + +static void HandleNodebugAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() > 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + if (!isFunctionOrMethod(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + d->addAttr(::new (S.Context) NodebugAttr()); +} + +static void HandleNoinlineAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + if (!isa<FunctionDecl>(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + d->addAttr(::new (S.Context) NoinlineAttr()); +} + +static void HandleGNUInlineAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; + return; + } + + FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); + if (Fn == 0) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + if (!Fn->isInline()) { + S.Diag(Attr.getLoc(), diag::warn_gnu_inline_attribute_requires_inline); + return; + } + + d->addAttr(::new (S.Context) GNUInlineAttr()); +} + +static void HandleRegparmAttr(Decl *d, const AttributeList &Attr, Sema &S) { + // check the attribute arguments. + if (Attr.getNumArgs() != 1) { + S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; + return; + } + + if (!isFunctionOrMethod(d)) { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 0 /*function*/; + return; + } + + Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0)); + llvm::APSInt NumParams(32); + if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) { + S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) + << "regparm" << NumParamsExpr->getSourceRange(); + return; + } + + if (S.Context.Target.getRegParmMax() == 0) { + S.Diag(Attr.getLoc(), diag::err_attribute_regparm_wrong_platform) + << NumParamsExpr->getSourceRange(); + return; + } + + if (NumParams.getLimitedValue(255) > S.Context.Target.getRegParmMax()) { + S.Diag(Attr.getLoc(), diag::err_attribute_regparm_invalid_number) + << S.Context.Target.getRegParmMax() << NumParamsExpr->getSourceRange(); + return; + } + + d->addAttr(::new (S.Context) RegparmAttr(NumParams.getZExtValue())); +} + +//===----------------------------------------------------------------------===// +// Checker-specific attribute handlers. +//===----------------------------------------------------------------------===// + +static void HandleNSReturnsRetainedAttr(Decl *d, const AttributeList &Attr, + Sema &S) { + + QualType RetTy; + + if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(d)) + RetTy = MD->getResultType(); + else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(d)) + RetTy = FD->getResultType(); + else { + S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) + << Attr.getName() << 3 /* function or method */; + return; + } + + if (!(S.Context.isObjCNSObjectType(RetTy) || RetTy->getAsPointerType())) { + S.Diag(Attr.getLoc(), diag::warn_ns_attribute_wrong_return_type) + << Attr.getName(); + return; + } + + switch (Attr.getKind()) { + default: + assert(0 && "invalid ownership attribute"); + return; + case AttributeList::AT_cf_returns_retained: + d->addAttr(::new (S.Context) CFReturnsRetainedAttr()); + return; + case AttributeList::AT_ns_returns_retained: + d->addAttr(::new (S.Context) NSReturnsRetainedAttr()); + return; + }; +} + +//===----------------------------------------------------------------------===// +// 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. +static void ProcessDeclAttribute(Decl *D, const AttributeList &Attr, Sema &S) { + switch (Attr.getKind()) { + case AttributeList::AT_IBOutlet: HandleIBOutletAttr (D, Attr, S); break; + case AttributeList::AT_address_space: + case AttributeList::AT_objc_gc: + // Ignore these, these are type attributes, handled by ProcessTypeAttributes. + break; + case AttributeList::AT_alias: HandleAliasAttr (D, Attr, S); break; + case AttributeList::AT_aligned: HandleAlignedAttr (D, Attr, S); break; + case AttributeList::AT_always_inline: + HandleAlwaysInlineAttr (D, Attr, S); break; + case AttributeList::AT_analyzer_noreturn: + HandleAnalyzerNoReturnAttr (D, Attr, S); break; + case AttributeList::AT_annotate: HandleAnnotateAttr (D, Attr, S); break; + case AttributeList::AT_constructor: HandleConstructorAttr(D, Attr, S); break; + case AttributeList::AT_deprecated: HandleDeprecatedAttr(D, Attr, S); break; + case AttributeList::AT_destructor: HandleDestructorAttr(D, Attr, S); break; + case AttributeList::AT_dllexport: HandleDLLExportAttr (D, Attr, S); break; + case AttributeList::AT_dllimport: HandleDLLImportAttr (D, Attr, S); break; + case AttributeList::AT_ext_vector_type: + HandleExtVectorTypeAttr(D, Attr, S); + break; + case AttributeList::AT_fastcall: HandleFastCallAttr (D, Attr, S); break; + case AttributeList::AT_format: HandleFormatAttr (D, Attr, S); break; + case AttributeList::AT_format_arg: HandleFormatArgAttr (D, Attr, S); break; + case AttributeList::AT_gnu_inline: HandleGNUInlineAttr(D, Attr, S); break; + case AttributeList::AT_mode: HandleModeAttr (D, Attr, S); break; + case AttributeList::AT_nonnull: HandleNonNullAttr (D, Attr, S); break; + case AttributeList::AT_noreturn: HandleNoReturnAttr (D, Attr, S); break; + case AttributeList::AT_nothrow: HandleNothrowAttr (D, Attr, S); break; + + // Checker-specific. + case AttributeList::AT_ns_returns_retained: + case AttributeList::AT_cf_returns_retained: + HandleNSReturnsRetainedAttr(D, Attr, S); break; + + case AttributeList::AT_packed: HandlePackedAttr (D, Attr, S); break; + case AttributeList::AT_section: HandleSectionAttr (D, Attr, S); break; + case AttributeList::AT_stdcall: HandleStdCallAttr (D, Attr, S); break; + case AttributeList::AT_unavailable: HandleUnavailableAttr(D, Attr, S); break; + case AttributeList::AT_unused: HandleUnusedAttr (D, Attr, S); break; + case AttributeList::AT_used: HandleUsedAttr (D, Attr, S); break; + case AttributeList::AT_vector_size: HandleVectorSizeAttr(D, Attr, S); break; + case AttributeList::AT_visibility: HandleVisibilityAttr(D, Attr, S); break; + case AttributeList::AT_warn_unused_result: HandleWarnUnusedResult(D,Attr,S); + break; + case AttributeList::AT_weak: HandleWeakAttr (D, Attr, S); break; + case AttributeList::AT_weak_import: HandleWeakImportAttr(D, Attr, S); break; + case AttributeList::AT_transparent_union: + HandleTransparentUnionAttr(D, Attr, S); + break; + case AttributeList::AT_objc_exception: + HandleObjCExceptionAttr(D, Attr, S); + break; + case AttributeList::AT_overloadable:HandleOverloadableAttr(D, Attr, S); break; + case AttributeList::AT_nsobject: HandleObjCNSObject (D, Attr, S); break; + case AttributeList::AT_blocks: HandleBlocksAttr (D, Attr, S); break; + case AttributeList::AT_sentinel: HandleSentinelAttr (D, Attr, S); break; + case AttributeList::AT_const: HandleConstAttr (D, Attr, S); break; + case AttributeList::AT_pure: HandlePureAttr (D, Attr, S); break; + case AttributeList::AT_cleanup: HandleCleanupAttr (D, Attr, S); break; + case AttributeList::AT_nodebug: HandleNodebugAttr (D, Attr, S); break; + case AttributeList::AT_noinline: HandleNoinlineAttr (D, Attr, S); break; + case AttributeList::AT_regparm: HandleRegparmAttr (D, Attr, S); break; + case AttributeList::IgnoredAttribute: + case AttributeList::AT_no_instrument_function: // Interacts with -pg. + // Just ignore + break; + default: + S.Diag(Attr.getLoc(), diag::warn_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(Decl *D, const AttributeList *AttrList) { + while (AttrList) { + ProcessDeclAttribute(D, *AttrList, *this); + AttrList = AttrList->getNext(); + } +} + +/// 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(Decl *D, const Declarator &PD) { + // Apply decl attributes from the DeclSpec if present. + if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes()) + ProcessDeclAttributeList(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(D, Attrs); + + // Finally, apply any attributes on the decl itself. + if (const AttributeList *Attrs = PD.getAttributes()) + ProcessDeclAttributeList(D, Attrs); +} |
