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//===--- 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/DeclTemplate.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/DelayedDiagnostic.h"
#include "clang/Sema/Lookup.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,
ExpectedFunctionMethodOrParameter,
ExpectedClass,
ExpectedVariable,
ExpectedMethod,
ExpectedVariableFunctionOrLabel,
ExpectedFieldOrGlobalVar,
ExpectedStruct,
ExpectedTLSVar
};
//===----------------------------------------------------------------------===//
// 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");
}
/// \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 int Num) {
if (Attr.getNumArgs() != Num) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 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 int Num) {
if (Attr.getNumArgs() < 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) && hasFunctionProto(D));
// In C++ the implicit 'this' function parameter also counts.
// Parameters are counted from one.
const bool HasImplicitThisParam = isInstanceMethod(D);
const unsigned NumArgs = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam;
const unsigned FirstIdx = 1;
llvm::APSInt IdxInt;
if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() ||
!IdxExpr->isIntegerConstantExpr(IdxInt, S.Context)) {
S.Diag(AttrLoc, diag::err_attribute_argument_n_not_int)
<< AttrName << AttrArgNum << IdxExpr->getSourceRange();
return false;
}
Idx = IdxInt.getLimitedValue();
if (Idx < FirstIdx || (!isFunctionOrMethodVariadic(D) && 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 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->isThreadSpecified()));
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.first == Res1.second)
return false;
DeclContextLookupConstResult Res2 = RT->getDecl()->lookup(
S.Context.DeclarationNames.getCXXOperatorName(OO_Arrow));
if (Res2.first == Res2.second)
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.getArg(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->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) {
assert(!Attr.isInvalid());
if (!checkAttributeNumArgs(S, Attr, 0))
return false;
// 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));
}
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));
}
static bool checkGuardedByAttrCommon(Sema &S, Decl *D,
const AttributeList &Attr,
Expr* &Arg) {
assert(!Attr.isInvalid());
if (!checkAttributeNumArgs(S, Attr, 1))
return false;
// 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) {
assert(!Attr.isInvalid());
if (!checkAttributeNumArgs(S, Attr, 0))
return false;
// FIXME: Lockable structs for C code.
if (!isa<CXXRecordDecl>(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));
}
static void handleNoThreadSafetyAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
assert(!Attr.isInvalid());
if (!checkAttributeNumArgs(S, Attr, 0))
return;
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 handleNoAddressSafetyAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
assert(!Attr.isInvalid());
if (!checkAttributeNumArgs(S, Attr, 0))
return;
if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedFunctionOrMethod;
return;
}
D->addAttr(::new (S.Context) NoAddressSafetyAnalysisAttr(Attr.getRange(),
S.Context));
}
static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D,
const AttributeList &Attr,
SmallVector<Expr*, 1> &Args) {
assert(!Attr.isInvalid());
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.size() == 0)
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()));
}
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()));
}
static bool checkLockFunAttrCommon(Sema &S, Decl *D,
const AttributeList &Attr,
SmallVector<Expr*, 1> &Args) {
assert(!Attr.isInvalid());
// 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));
}
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));
}
static bool checkTryLockFunAttrCommon(Sema &S, Decl *D,
const AttributeList &Attr,
SmallVector<Expr*, 2> &Args) {
assert(!Attr.isInvalid());
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.getArg(0))) {
S.Diag(Attr.getLoc(), diag::err_attribute_first_argument_not_int_or_bool)
<< Attr.getName();
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;
unsigned Size = Args.size();
Expr **StartArg = Size == 0 ? 0 : &Args[0];
D->addAttr(::new (S.Context) SharedTrylockFunctionAttr(Attr.getRange(),
S.Context,
Attr.getArg(0),
StartArg, Size));
}
static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
SmallVector<Expr*, 2> Args;
if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
return;
unsigned Size = Args.size();
Expr **StartArg = Size == 0 ? 0 : &Args[0];
D->addAttr(::new (S.Context) ExclusiveTrylockFunctionAttr(Attr.getRange(),
S.Context,
Attr.getArg(0),
StartArg, Size));
}
static bool checkLocksRequiredCommon(Sema &S, Decl *D,
const AttributeList &Attr,
SmallVector<Expr*, 1> &Args) {
assert(!Attr.isInvalid());
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.size() == 0)
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()));
}
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()));
}
static void handleUnlockFunAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
assert(!Attr.isInvalid());
// 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));
}
static void handleLockReturnedAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
assert(!Attr.isInvalid());
if (!checkAttributeNumArgs(S, Attr, 1))
return;
Expr *Arg = Attr.getArg(0);
if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type)
<< Attr.getName() << ThreadExpectedFunctionOrMethod;
return;
}
if (Arg->isTypeDependent())
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]));
}
static void handleLocksExcludedAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
assert(!Attr.isInvalid());
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));
}
static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D,
const AttributeList &Attr) {
TypedefNameDecl *tDecl = dyn_cast<TypedefNameDecl>(D);
if (tDecl == 0) {
S.Diag(Attr.getLoc(), diag::err_typecheck_ext_vector_not_typedef);
return;
}
QualType curType = tDecl->getUnderlyingType();
Expr *sizeExpr;
// Special case where the argument is a template id.
if (Attr.getParameterName()) {
CXXScopeSpec SS;
SourceLocation TemplateKWLoc;
UnqualifiedId id;
id.setIdentifier(Attr.getParameterName(), Attr.getLoc());
ExprResult Size = S.ActOnIdExpression(scope, SS, TemplateKWLoc, id,
false, false);
if (Size.isInvalid())
return;
sizeExpr = Size.get();
} else {
// check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 1))
return;
sizeExpr = Attr.getArg(0);
}
// Instantiate/Install the vector type, and let Sema build the type for us.
// This will run the reguired checks.
QualType T = S.BuildExtVectorType(curType, sizeExpr, Attr.getLoc());
if (!T.isNull()) {
// FIXME: preserve the old source info.
tDecl->setTypeSourceInfo(S.Context.getTrivialTypeSourceInfo(T));
// Remember this typedef decl, we will need it later for diagnostics.
S.ExtVectorDecls.push_back(tDecl);
}
}
static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 0))
return;
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()->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));
} else
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
}
static void handleMsStructAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (TagDecl *TD = dyn_cast<TagDecl>(D))
TD->addAttr(::new (S.Context) MsStructAttr(Attr.getRange(), S.Context));
else
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
}
static void handleIBAction(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 0))
return;
// 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));
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) {
// check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 0))
return;
if (!checkIBOutletCommon(S, D, Attr))
return;
D->addAttr(::new (S.Context) IBOutletAttr(Attr.getRange(), S.Context));
}
static void handleIBOutletCollection(Sema &S, Decl *D,
const AttributeList &Attr) {
// The iboutletcollection attribute can have zero or one arguments.
if (Attr.getParameterName() && Attr.getNumArgs() > 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
return;
}
if (!checkIBOutletCommon(S, D, Attr))
return;
IdentifierInfo *II = Attr.getParameterName();
if (!II)
II = &S.Context.Idents.get("NSObject");
ParsedType TypeRep = S.getTypeName(*II, Attr.getLoc(),
S.getScopeForContext(D->getDeclContext()->getParent()));
if (!TypeRep) {
S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << II;
return;
}
QualType QT = TypeRep.get();
// 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(), diag::err_iboutletcollection_type) << II;
return;
}
D->addAttr(::new (S.Context) IBOutletCollectionAttr(Attr.getRange(),S.Context,
QT, Attr.getParameterLoc()));
}
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)
<< "alloc_size" << ExpectedFunctionOrMethod;
return;
}
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
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;
SmallVector<unsigned, 8> SizeArgs;
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 = *I;
llvm::APSInt ArgNum;
if (Ex->isTypeDependent() || Ex->isValueDependent() ||
!Ex->isIntegerConstantExpr(ArgNum, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
<< "alloc_size" << Ex->getSourceRange();
return;
}
uint64_t x = ArgNum.getZExtValue();
if (x < 1 || x > NumArgs) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< "alloc_size" << I.getArgNum() << Ex->getSourceRange();
return;
}
--x;
if (HasImplicitThisParam) {
if (x == 0) {
S.Diag(Attr.getLoc(),
diag::err_attribute_invalid_implicit_this_argument)
<< "alloc_size" << Ex->getSourceRange();
return;
}
--x;
}
// check if the function argument is of an integer type
QualType T = getFunctionOrMethodArgType(D, x).getNonReferenceType();
if (!T->isIntegerType()) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
<< "alloc_size" << Ex->getSourceRange();
return;
}
SizeArgs.push_back(x);
}
// check if the function returns a pointer
if (!getFunctionType(D)->getResultType()->isAnyPointerType()) {
S.Diag(Attr.getLoc(), diag::warn_ns_attribute_wrong_return_type)
<< "alloc_size" << 0 /*function*/<< 1 /*pointer*/ << D->getSourceRange();
}
D->addAttr(::new (S.Context) AllocSizeAttr(Attr.getRange(), S.Context,
SizeArgs.data(), SizeArgs.size()));
}
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;
}
// In C++ the implicit 'this' function parameter also counts, and they are
// counted from one.
bool HasImplicitThisParam = isInstanceMethod(D);
unsigned NumArgs = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam;
// The nonnull attribute only applies to pointers.
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 = *I;
llvm::APSInt ArgNum(32);
if (Ex->isTypeDependent() || Ex->isValueDependent() ||
!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;
if (HasImplicitThisParam) {
if (x == 0) {
S.Diag(Attr.getLoc(),
diag::err_attribute_invalid_implicit_this_argument)
<< "nonnull" << Ex->getSourceRange();
return;
}
--x;
}
// Is the function argument a pointer type?
QualType T = getFunctionOrMethodArgType(D, x).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(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).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));
}
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 a string,
// 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.getParameterName()) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_not_string)
<< AL.getName()->getName() << 1;
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() < 1) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2;
return;
}
break;
case AttributeList::AT_ownership_holds:
K = OwnershipAttr::Holds;
if (AL.getNumArgs() < 1) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2;
return;
}
break;
case AttributeList::AT_ownership_returns:
K = OwnershipAttr::Returns;
if (AL.getNumArgs() > 1) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments)
<< AL.getNumArgs() + 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;
}
// In C++ the implicit 'this' function parameter also counts, and they are
// counted from one.
bool HasImplicitThisParam = isInstanceMethod(D);
unsigned NumArgs = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam;
StringRef Module = AL.getParameterName()->getName();
// Normalize the argument, __foo__ becomes foo.
if (Module.startswith("__") && Module.endswith("__"))
Module = Module.substr(2, Module.size() - 4);
SmallVector<unsigned, 10> OwnershipArgs;
for (AttributeList::arg_iterator I = AL.arg_begin(), E = AL.arg_end(); I != E;
++I) {
Expr *IdxExpr = *I;
llvm::APSInt ArgNum(32);
if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent()
|| !IdxExpr->isIntegerConstantExpr(ArgNum, S.Context)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_not_int)
<< AL.getName()->getName() << IdxExpr->getSourceRange();
continue;
}
unsigned x = (unsigned) ArgNum.getZExtValue();
if (x > NumArgs || x < 1) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< AL.getName()->getName() << x << IdxExpr->getSourceRange();
continue;
}
--x;
if (HasImplicitThisParam) {
if (x == 0) {
S.Diag(AL.getLoc(), diag::err_attribute_invalid_implicit_this_argument)
<< "ownership" << IdxExpr->getSourceRange();
return;
}
--x;
}
switch (K) {
case OwnershipAttr::Takes:
case OwnershipAttr::Holds: {
// Is the function argument a pointer type?
QualType T = getFunctionOrMethodArgType(D, x);
if (!T->isAnyPointerType() && !T->isBlockPointerType()) {
// FIXME: Should also highlight argument in decl.
S.Diag(AL.getLoc(), diag::err_ownership_type)
<< ((K==OwnershipAttr::Takes)?"ownership_takes":"ownership_holds")
<< "pointer"
<< IdxExpr->getSourceRange();
continue;
}
break;
}
case OwnershipAttr::Returns: {
if (AL.getNumArgs() > 1) {
// Is the function argument an integer type?
Expr *IdxExpr = AL.getArg(0);
llvm::APSInt ArgNum(32);
if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent()
|| !IdxExpr->isIntegerConstantExpr(ArgNum, S.Context)) {
S.Diag(AL.getLoc(), diag::err_ownership_type)
<< "ownership_returns" << "integer"
<< IdxExpr->getSourceRange();
return;
}
}
break;
}
} // switch
// 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) {
for (const unsigned *I = (*i)->args_begin(), *E = (*i)->args_end();
I!=E; ++I) {
if (x == *I) {
S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
<< AL.getName()->getName() << "ownership_*";
}
}
}
}
OwnershipArgs.push_back(x);
}
unsigned* start = OwnershipArgs.data();
unsigned size = OwnershipArgs.size();
llvm::array_pod_sort(start, start + size);
if (K != OwnershipAttr::Returns && OwnershipArgs.empty()) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2;
return;
}
D->addAttr(::new (S.Context) OwnershipAttr(AL.getLoc(), S.Context, K, Module,
start, size));
}
/// Whether this declaration has internal linkage for the purposes of
/// things that want to complain about things not have internal linkage.
static bool hasEffectivelyInternalLinkage(NamedDecl *D) {
switch (D->getLinkage()) {
case NoLinkage:
case InternalLinkage:
return true;
// Template instantiations that go from external to unique-external
// shouldn't get diagnosed.
case UniqueExternalLinkage:
return true;
case ExternalLinkage:
return false;
}
llvm_unreachable("unknown linkage kind!");
}
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) << 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.
if (!hasEffectivelyInternalLinkage(nd)) {
S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_static);
return;
}
// GCC rejects
// static ((alias ("y"), weakref)).
// Should we? How to check that weakref is before or after alias?
if (Attr.getNumArgs() == 1) {
Expr *Arg = Attr.getArg(0);
Arg = Arg->IgnoreParenCasts();
StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
if (!Str || !Str->isAscii()) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
<< "weakref" << 1;
return;
}
// 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->getString()));
}
D->addAttr(::new (S.Context) WeakRefAttr(Attr.getRange(), S.Context));
}
static void handleAliasAttr(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) << 1;
return;
}
Expr *Arg = Attr.getArg(0);
Arg = Arg->IgnoreParenCasts();
StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
if (!Str || !Str->isAscii()) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
<< "alias" << 1;
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->getString()));
}
static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 0))
return;
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));
}
static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 0))
return;
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));
}
static void handleNakedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 0))
return;
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));
}
static void handleAlwaysInlineAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
// Check the attribute arguments.
if (Attr.hasParameterOrArguments()) {
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() << ExpectedFunction;
return;
}
D->addAttr(::new (S.Context) AlwaysInlineAttr(Attr.getRange(), S.Context));
}
static void handleTLSModelAttr(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) << 1;
return;
}
Expr *Arg = Attr.getArg(0);
Arg = Arg->IgnoreParenCasts();
StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
// Check that it is a string.
if (!Str) {
S.Diag(Attr.getLoc(), diag::err_attribute_not_string) << "tls_model";
return;
}
if (!isa<VarDecl>(D) || !cast<VarDecl>(D)->isThreadSpecified()) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedTLSVar;
return;
}
// Check that the value.
StringRef Model = Str->getString();
if (Model != "global-dynamic" && Model != "local-dynamic"
&& Model != "initial-exec" && Model != "local-exec") {
S.Diag(Attr.getLoc(), diag::err_attr_tlsmodel_arg);
return;
}
D->addAttr(::new (S.Context) TLSModelAttr(Attr.getRange(), S.Context,
Model));
}
static void handleMallocAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Check the attribute arguments.
if (Attr.hasParameterOrArguments()) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
return;
}
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));
return;
}
}
S.Diag(Attr.getLoc(), diag::warn_attribute_malloc_pointer_only);
}
static void handleMayAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 0))
return;
D->addAttr(::new (S.Context) MayAliasAttr(Attr.getRange(), S.Context));
}
static void handleNoCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
assert(!Attr.isInvalid());
if (isa<VarDecl>(D))
D->addAttr(::new (S.Context) NoCommonAttr(Attr.getRange(), S.Context));
else
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedVariable;
}
static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
assert(!Attr.isInvalid());
if (isa<VarDecl>(D))
D->addAttr(::new (S.Context) CommonAttr(Attr.getRange(), S.Context));
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));
}
bool Sema::CheckNoReturnAttr(const AttributeList &attr) {
if (attr.hasParameterOrArguments()) {
Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 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(!checkAttributeNumArgs(S, Attr, 0))
return;
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.isCXX0XAttribute() ? 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));
}
// 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));
}
static void handleDependencyAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!isFunctionOrMethod(D) && !isa<ParmVarDecl>(D)) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedFunctionMethodOrParameter;
return;
}
// FIXME: Actually store the attribute on the declaration
}
static void handleUnusedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (Attr.hasParameterOrArguments()) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
return;
}
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));
}
static void handleReturnsTwiceAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
// check the attribute arguments.
if (Attr.hasParameterOrArguments()) {
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() << ExpectedFunction;
return;
}
D->addAttr(::new (S.Context) ReturnsTwiceAttr(Attr.getRange(), S.Context));
}
static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (Attr.hasParameterOrArguments()) {
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() << ExpectedVariableOrFunction;
return;
}
D->addAttr(::new (S.Context) UsedAttr(Attr.getRange(), S.Context));
}
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.getArg(0);
llvm::APSInt Idx(32);
if (E->isTypeDependent() || E->isValueDependent() ||
!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() << ExpectedFunction;
return;
}
D->addAttr(::new (S.Context) ConstructorAttr(Attr.getRange(), S.Context,
priority));
}
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.getArg(0);
llvm::APSInt Idx(32);
if (E->isTypeDependent() || E->isValueDependent() ||
!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() << ExpectedFunction;
return;
}
D->addAttr(::new (S.Context) DestructorAttr(Attr.getRange(), S.Context,
priority));
}
template <typename AttrTy>
static void handleAttrWithMessage(Sema &S, Decl *D, const AttributeList &Attr,
const char *Name) {
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) {
StringLiteral *SE = dyn_cast<StringLiteral>(Attr.getArg(0));
if (!SE) {
S.Diag(Attr.getArg(0)->getLocStart(), diag::err_attribute_not_string)
<< Name;
return;
}
Str = SE->getString();
}
D->addAttr(::new (S.Context) AttrTy(Attr.getRange(), S.Context, Str));
}
static void handleArcWeakrefUnavailableAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
unsigned NumArgs = Attr.getNumArgs();
if (NumArgs > 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 0;
return;
}
D->addAttr(::new (S.Context) ArcWeakrefUnavailableAttr(
Attr.getRange(), S.Context));
}
static void handleObjCRootClassAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!isa<ObjCInterfaceDecl>(D)) {
S.Diag(Attr.getLoc(), diag::err_attribute_requires_objc_interface);
return;
}
unsigned NumArgs = Attr.getNumArgs();
if (NumArgs > 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 0;
return;
}
D->addAttr(::new (S.Context) ObjCRootClassAttr(Attr.getRange(), S.Context));
}
static void handleObjCRequiresPropertyDefsAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!isa<ObjCInterfaceDecl>(D)) {
S.Diag(Attr.getLoc(), diag::err_suppress_autosynthesis);
return;
}
unsigned NumArgs = Attr.getNumArgs();
if (NumArgs > 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 0;
return;
}
D->addAttr(::new (S.Context) ObjCRequiresPropertyDefsAttr(
Attr.getRange(), S.Context));
}
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;
}
AvailabilityAttr *Sema::mergeAvailabilityAttr(Decl *D, SourceRange Range,
IdentifierInfo *Platform,
VersionTuple Introduced,
VersionTuple Deprecated,
VersionTuple Obsoleted,
bool IsUnavailable,
StringRef Message) {
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();
StringRef OldMessage = OldAA->getMessage();
if ((!OldIntroduced.empty() && !Introduced.empty() &&
OldIntroduced != Introduced) ||
(!OldDeprecated.empty() && !Deprecated.empty() &&
OldDeprecated != Deprecated) ||
(!OldObsoleted.empty() && !Obsoleted.empty() &&
OldObsoleted != Obsoleted) ||
(OldIsUnavailable != IsUnavailable) ||
(OldMessage != Message)) {
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;
if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
MergedDeprecated, MergedObsoleted)) {
return ::new (Context) AvailabilityAttr(Range, Context, Platform,
Introduced, Deprecated,
Obsoleted, IsUnavailable, Message);
}
return NULL;
}
static void handleAvailabilityAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
IdentifierInfo *Platform = Attr.getParameterName();
SourceLocation PlatformLoc = Attr.getParameterLoc();
if (AvailabilityAttr::getPrettyPlatformName(Platform->getName()).empty())
S.Diag(PlatformLoc, diag::warn_availability_unknown_platform)
<< Platform;
AvailabilityChange Introduced = Attr.getAvailabilityIntroduced();
AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated();
AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted();
bool IsUnavailable = Attr.getUnavailableLoc().isValid();
StringRef Str;
const StringLiteral *SE =
dyn_cast_or_null<const StringLiteral>(Attr.getMessageExpr());
if (SE)
Str = SE->getString();
AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(D, Attr.getRange(),
Platform,
Introduced.Version,
Deprecated.Version,
Obsoleted.Version,
IsUnavailable, Str);
if (NewAttr)
D->addAttr(NewAttr);
}
VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range,
VisibilityAttr::VisibilityType Vis) {
if (isa<TypedefNameDecl>(D)) {
Diag(Range.getBegin(), diag::warn_attribute_ignored) << "visibility";
return NULL;
}
VisibilityAttr *ExistingAttr = D->getAttr<VisibilityAttr>();
if (ExistingAttr) {
VisibilityAttr::VisibilityType ExistingVis = ExistingAttr->getVisibility();
if (ExistingVis == Vis)
return NULL;
Diag(ExistingAttr->getLocation(), diag::err_mismatched_visibility);
Diag(Range.getBegin(), diag::note_previous_attribute);
D->dropAttr<VisibilityAttr>();
}
return ::new (Context) VisibilityAttr(Range, Context, Vis);
}
static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if(!checkAttributeNumArgs(S, Attr, 1))
return;
Expr *Arg = Attr.getArg(0);
Arg = Arg->IgnoreParenCasts();
StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
if (!Str || !Str->isAscii()) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
<< "visibility" << 1;
return;
}
StringRef TypeStr = Str->getString();
VisibilityAttr::VisibilityType type;
if (TypeStr == "default")
type = VisibilityAttr::Default;
else if (TypeStr == "hidden")
type = VisibilityAttr::Hidden;
else if (TypeStr == "internal")
type = VisibilityAttr::Hidden; // FIXME
else if (TypeStr == "protected") {
// Complain about attempts to use protected visibility on targets
// (like Darwin) that don't support it.
if (!S.Context.getTargetInfo().hasProtectedVisibility()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_protected_visibility);
type = VisibilityAttr::Default;
} else {
type = VisibilityAttr::Protected;
}
} else {
S.Diag(Attr.getLoc(), diag::warn_attribute_unknown_visibility) << TypeStr;
return;
}
VisibilityAttr *NewAttr = S.mergeVisibilityAttr(D, Attr.getRange(), type);
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.getNumArgs() != 0 || !Attr.getParameterName()) {
if (!Attr.getParameterName() && Attr.getNumArgs() == 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
<< "objc_method_family" << 1;
} else {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
}
Attr.setInvalid();
return;
}
StringRef param = Attr.getParameterName()->getName();
ObjCMethodFamilyAttr::FamilyKind family;
if (param == "none")
family = ObjCMethodFamilyAttr::OMF_None;
else if (param == "alloc")
family = ObjCMethodFamilyAttr::OMF_alloc;
else if (param == "copy")
family = ObjCMethodFamilyAttr::OMF_copy;
else if (param == "init")
family = ObjCMethodFamilyAttr::OMF_init;
else if (param == "mutableCopy")
family = ObjCMethodFamilyAttr::OMF_mutableCopy;
else if (param == "new")
family = ObjCMethodFamilyAttr::OMF_new;
else {
// Just warn and ignore it. This is future-proof against new
// families being used in system headers.
S.Diag(Attr.getParameterLoc(), diag::warn_unknown_method_family);
return;
}
if (family == 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, family));
}
static void handleObjCExceptionAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!checkAttributeNumArgs(S, Attr, 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(Attr.getRange(), S.Context));
}
static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) {
if (Attr.getNumArgs() != 0) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
return;
}
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));
}
static void
handleOverloadableAttr(Sema &S, Decl *D, const AttributeList &Attr) {
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(Attr.getRange(), S.Context));
}
static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) {
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::BlockType 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(Attr.getRange(), S.Context, type));
}
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.getArg(0);
llvm::APSInt Idx(32);
if (E->isTypeDependent() || E->isValueDependent() ||
!E->isIntegerConstantExpr(Idx, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
<< "sentinel" << 1 << 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.getArg(1);
llvm::APSInt Idx(32);
if (E->isTypeDependent() || E->isValueDependent() ||
!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 ((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