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android / platform / external / clang_35a / bf6a66cd290403bd051f6e4266c96786e666993e / . / lib / Sema / SemaDeclAttr.cpp
blob: 1920182ce201dfb04c21325d1e987df12da8e66c [file] [log] [blame]
//===--- SemaDeclAttr.cpp - Declaration Attribute Handling ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements decl-related attribute processing.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/SemaInternal.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Mangle.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/DelayedDiagnostic.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Scope.h"
#include "llvm/ADT/StringExtras.h"
using namespace clang;
using namespace sema;
namespace AttributeLangSupport {
enum LANG {
C,
Cpp,
ObjC
};
}
//===----------------------------------------------------------------------===//
// Helper functions
//===----------------------------------------------------------------------===//
/// isFunctionOrMethod - Return true if the given decl has function
/// type (function or function-typed variable) or an Objective-C
/// method.
static bool isFunctionOrMethod(const Decl *D) {
return (D->getFunctionType() != NULL) || isa<ObjCMethodDecl>(D);
}
/// Return true if the given decl has a declarator that should have
/// been processed by Sema::GetTypeForDeclarator.
static bool hasDeclarator(const Decl *D) {
// In some sense, TypedefDecl really *ought* to be a DeclaratorDecl.
return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) ||
isa<ObjCPropertyDecl>(D);
}
/// hasFunctionProto - Return true if the given decl has a argument
/// information. This decl should have already passed
/// isFunctionOrMethod or isFunctionOrMethodOrBlock.
static bool hasFunctionProto(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return isa<FunctionProtoType>(FnTy);
return isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D);
}
/// getFunctionOrMethodNumParams - Return number of function or method
/// parameters. It is an error to call this on a K&R function (use
/// hasFunctionProto first).
static unsigned getFunctionOrMethodNumParams(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return cast<FunctionProtoType>(FnTy)->getNumParams();
if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
return BD->getNumParams();
return cast<ObjCMethodDecl>(D)->param_size();
}
static QualType getFunctionOrMethodParamType(const Decl *D, unsigned Idx) {
if (const FunctionType *FnTy = D->getFunctionType())
return cast<FunctionProtoType>(FnTy)->getParamType(Idx);
if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
return BD->getParamDecl(Idx)->getType();
return cast<ObjCMethodDecl>(D)->param_begin()[Idx]->getType();
}
static QualType getFunctionOrMethodResultType(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return cast<FunctionProtoType>(FnTy)->getReturnType();
return cast<ObjCMethodDecl>(D)->getReturnType();
}
static bool isFunctionOrMethodVariadic(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType()) {
const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy);
return proto->isVariadic();
} else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
return BD->isVariadic();
else {
return cast<ObjCMethodDecl>(D)->isVariadic();
}
}
static bool isInstanceMethod(const Decl *D) {
if (const CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D))
return MethodDecl->isInstance();
return false;
}
static inline bool isNSStringType(QualType T, ASTContext &Ctx) {
const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>();
if (!PT)
return false;
ObjCInterfaceDecl *Cls = PT->getObjectType()->getInterface();
if (!Cls)
return false;
IdentifierInfo* ClsName = Cls->getIdentifier();
// FIXME: Should we walk the chain of classes?
return ClsName == &Ctx.Idents.get("NSString") ||
ClsName == &Ctx.Idents.get("NSMutableString");
}
static inline bool isCFStringType(QualType T, ASTContext &Ctx) {
const PointerType *PT = T->getAs<PointerType>();
if (!PT)
return false;
const RecordType *RT = PT->getPointeeType()->getAs<RecordType>();
if (!RT)
return false;
const RecordDecl *RD = RT->getDecl();
if (RD->getTagKind() != TTK_Struct)
return false;
return RD->getIdentifier() == &Ctx.Idents.get("__CFString");
}
static unsigned getNumAttributeArgs(const AttributeList &Attr) {
// FIXME: Include the type in the argument list.
return Attr.getNumArgs() + Attr.hasParsedType();
}
/// \brief Check if the attribute has exactly as many args as Num. May
/// output an error.
static bool checkAttributeNumArgs(Sema &S, const AttributeList &Attr,
unsigned Num) {
if (getNumAttributeArgs(Attr) != Num) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
<< Attr.getName() << Num;
return false;
}
return true;
}
/// \brief Check if the attribute has at least as many args as Num. May
/// output an error.
static bool checkAttributeAtLeastNumArgs(Sema &S, const AttributeList &Attr,
unsigned Num) {
if (getNumAttributeArgs(Attr) < Num) {
S.Diag(Attr.getLoc(), diag::err_attribute_too_few_arguments)
<< Attr.getName() << Num;
return false;
}
return true;
}
/// \brief If Expr is a valid integer constant, get the value of the integer
/// expression and return success or failure. May output an error.
static bool checkUInt32Argument(Sema &S, const AttributeList &Attr,
const Expr *Expr, uint32_t &Val,
unsigned Idx = UINT_MAX) {
llvm::APSInt I(32);
if (Expr->isTypeDependent() || Expr->isValueDependent() ||
!Expr->isIntegerConstantExpr(I, S.Context)) {
if (Idx != UINT_MAX)
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
<< Attr.getName() << Idx << AANT_ArgumentIntegerConstant
<< Expr->getSourceRange();
else
S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
<< Attr.getName() << AANT_ArgumentIntegerConstant
<< Expr->getSourceRange();
return false;
}
Val = (uint32_t)I.getZExtValue();
return true;
}
/// \brief Diagnose mutually exclusive attributes when present on a given
/// declaration. Returns true if diagnosed.
template <typename AttrTy>
static bool checkAttrMutualExclusion(Sema &S, Decl *D,
const AttributeList &Attr) {
if (AttrTy *A = D->getAttr<AttrTy>()) {
S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
<< Attr.getName() << A;
return true;
}
return false;
}
/// \brief Check if IdxExpr is a valid parameter index for a function or
/// instance method D. May output an error.
///
/// \returns true if IdxExpr is a valid index.
static bool checkFunctionOrMethodParameterIndex(Sema &S, const Decl *D,
const AttributeList &Attr,
unsigned AttrArgNum,
const Expr *IdxExpr,
uint64_t &Idx) {
assert(isFunctionOrMethod(D));
// In C++ the implicit 'this' function parameter also counts.
// Parameters are counted from one.
bool HP = hasFunctionProto(D);
bool HasImplicitThisParam = isInstanceMethod(D);
bool IV = HP && isFunctionOrMethodVariadic(D);
unsigned NumParams =
(HP ? getFunctionOrMethodNumParams(D) : 0) + HasImplicitThisParam;
llvm::APSInt IdxInt;
if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() ||
!IdxExpr->isIntegerConstantExpr(IdxInt, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
<< Attr.getName() << AttrArgNum << AANT_ArgumentIntegerConstant
<< IdxExpr->getSourceRange();
return false;
}
Idx = IdxInt.getLimitedValue();
if (Idx < 1 || (!IV && Idx > NumParams)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< Attr.getName() << AttrArgNum << IdxExpr->getSourceRange();
return false;
}
Idx--; // Convert to zero-based.
if (HasImplicitThisParam) {
if (Idx == 0) {
S.Diag(Attr.getLoc(),
diag::err_attribute_invalid_implicit_this_argument)
<< Attr.getName() << IdxExpr->getSourceRange();
return false;
}
--Idx;
}
return true;
}
/// \brief Check if the argument \p ArgNum of \p Attr is a ASCII string literal.
/// If not emit an error and return false. If the argument is an identifier it
/// will emit an error with a fixit hint and treat it as if it was a string
/// literal.
bool Sema::checkStringLiteralArgumentAttr(const AttributeList &Attr,
unsigned ArgNum, StringRef &Str,
SourceLocation *ArgLocation) {
// Look for identifiers. If we have one emit a hint to fix it to a literal.
if (Attr.isArgIdent(ArgNum)) {
IdentifierLoc *Loc = Attr.getArgAsIdent(ArgNum);
Diag(Loc->Loc, diag::err_attribute_argument_type)
<< Attr.getName() << AANT_ArgumentString
<< FixItHint::CreateInsertion(Loc->Loc, "\"")
<< FixItHint::CreateInsertion(PP.getLocForEndOfToken(Loc->Loc), "\"");
Str = Loc->Ident->getName();
if (ArgLocation)
*ArgLocation = Loc->Loc;
return true;
}
// Now check for an actual string literal.
Expr *ArgExpr = Attr.getArgAsExpr(ArgNum);
StringLiteral *Literal = dyn_cast<StringLiteral>(ArgExpr->IgnoreParenCasts());
if (ArgLocation)
*ArgLocation = ArgExpr->getLocStart();
if (!Literal || !Literal->isAscii()) {
Diag(ArgExpr->getLocStart(), diag::err_attribute_argument_type)
<< Attr.getName() << AANT_ArgumentString;
return false;
}
Str = Literal->getString();
return true;
}
/// \brief Applies the given attribute to the Decl without performing any
/// additional semantic checking.
template <typename AttrType>
static void handleSimpleAttribute(Sema &S, Decl *D,
const AttributeList &Attr) {
D->addAttr(::new (S.Context) AttrType(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
/// \brief Check if the passed-in expression is of type int or bool.
static bool isIntOrBool(Expr *Exp) {
QualType QT = Exp->getType();
return QT->isBooleanType() || QT->isIntegerType();
}
// Check to see if the type is a smart pointer of some kind. We assume
// it's a smart pointer if it defines both operator-> and operator*.
static bool threadSafetyCheckIsSmartPointer(Sema &S, const RecordType* RT) {
DeclContextLookupConstResult Res1 = RT->getDecl()->lookup(
S.Context.DeclarationNames.getCXXOperatorName(OO_Star));
if (Res1.empty())
return false;
DeclContextLookupConstResult Res2 = RT->getDecl()->lookup(
S.Context.DeclarationNames.getCXXOperatorName(OO_Arrow));
if (Res2.empty())
return false;
return true;
}
/// \brief Check if passed in Decl is a pointer type.
/// Note that this function may produce an error message.
/// \return true if the Decl is a pointer type; false otherwise
static bool threadSafetyCheckIsPointer(Sema &S, const Decl *D,
const AttributeList &Attr) {
const ValueDecl *vd = cast<ValueDecl>(D);
QualType QT = vd->getType();
if (QT->isAnyPointerType())
return true;
if (const RecordType *RT = QT->getAs<RecordType>()) {
// If it's an incomplete type, it could be a smart pointer; skip it.
// (We don't want to force template instantiation if we can avoid it,
// since that would alter the order in which templates are instantiated.)
if (RT->isIncompleteType())
return true;
if (threadSafetyCheckIsSmartPointer(S, RT))
return true;
}
S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_pointer)
<< Attr.getName() << QT;
return false;
}
/// \brief Checks that the passed in QualType either is of RecordType or points
/// to RecordType. Returns the relevant RecordType, null if it does not exit.
static const RecordType *getRecordType(QualType QT) {
if (const RecordType *RT = QT->getAs<RecordType>())
return RT;
// Now check if we point to record type.
if (const PointerType *PT = QT->getAs<PointerType>())
return PT->getPointeeType()->getAs<RecordType>();
return 0;
}
static bool checkRecordTypeForCapability(Sema &S, QualType Ty) {
const RecordType *RT = getRecordType(Ty);
if (!RT)
return false;
// Don't check for the capability if the class hasn't been defined yet.
if (RT->isIncompleteType())
return true;
// Allow smart pointers to be used as capability objects.
// FIXME -- Check the type that the smart pointer points to.
if (threadSafetyCheckIsSmartPointer(S, RT))
return true;
// Check if the record itself has a capability.
RecordDecl *RD = RT->getDecl();
if (RD->hasAttr<CapabilityAttr>())
return true;
// Else check if any base classes have a capability.
if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
CXXBasePaths BPaths(false, false);
if (CRD->lookupInBases([](const CXXBaseSpecifier *BS, CXXBasePath &P,
void *) {
return BS->getType()->getAs<RecordType>()
->getDecl()->hasAttr<CapabilityAttr>();
}, 0, BPaths))
return true;
}
return false;
}
static bool checkTypedefTypeForCapability(QualType Ty) {
const auto *TD = Ty->getAs<TypedefType>();
if (!TD)
return false;
TypedefNameDecl *TN = TD->getDecl();
if (!TN)
return false;
return TN->hasAttr<CapabilityAttr>();
}
static bool typeHasCapability(Sema &S, QualType Ty) {
if (checkTypedefTypeForCapability(Ty))
return true;
if (checkRecordTypeForCapability(S, Ty))
return true;
return false;
}
static bool isCapabilityExpr(Sema &S, const Expr *Ex) {
// Capability expressions are simple expressions involving the boolean logic
// operators &&, || or !, a simple DeclRefExpr, CastExpr or a ParenExpr. Once
// a DeclRefExpr is found, its type should be checked to determine whether it
// is a capability or not.
if (const auto *E = dyn_cast<DeclRefExpr>(Ex))
return typeHasCapability(S, E->getType());
else if (const auto *E = dyn_cast<CastExpr>(Ex))
return isCapabilityExpr(S, E->getSubExpr());
else if (const auto *E = dyn_cast<ParenExpr>(Ex))
return isCapabilityExpr(S, E->getSubExpr());
else if (const auto *E = dyn_cast<UnaryOperator>(Ex)) {
if (E->getOpcode() == UO_LNot)
return isCapabilityExpr(S, E->getSubExpr());
return false;
} else if (const auto *E = dyn_cast<BinaryOperator>(Ex)) {
if (E->getOpcode() == BO_LAnd || E->getOpcode() == BO_LOr)
return isCapabilityExpr(S, E->getLHS()) &&
isCapabilityExpr(S, E->getRHS());
return false;
}
return false;
}
/// \brief Checks that all attribute arguments, starting from Sidx, resolve to
/// a capability object.
/// \param Sidx The attribute argument index to start checking with.
/// \param ParamIdxOk Whether an argument can be indexing into a function
/// parameter list.
static void checkAttrArgsAreCapabilityObjs(Sema &S, Decl *D,
const AttributeList &Attr,
SmallVectorImpl<Expr *> &Args,
int Sidx = 0,
bool ParamIdxOk = false) {
for (unsigned Idx = Sidx; Idx < Attr.getNumArgs(); ++Idx) {
Expr *ArgExp = Attr.getArgAsExpr(Idx);
if (ArgExp->isTypeDependent()) {
// FIXME -- need to check this again on template instantiation
Args.push_back(ArgExp);
continue;
}
if (StringLiteral *StrLit = dyn_cast<StringLiteral>(ArgExp)) {
if (StrLit->getLength() == 0 ||
(StrLit->isAscii() && StrLit->getString() == StringRef("*"))) {
// Pass empty strings to the analyzer without warnings.
// Treat "*" as the universal lock.
Args.push_back(ArgExp);
continue;
}
// We allow constant strings to be used as a placeholder for expressions
// that are not valid C++ syntax, but warn that they are ignored.
S.Diag(Attr.getLoc(), diag::warn_thread_attribute_ignored) <<
Attr.getName();
Args.push_back(ArgExp);
continue;
}
QualType ArgTy = ArgExp->getType();
// A pointer to member expression of the form &MyClass::mu is treated
// specially -- we need to look at the type of the member.
if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(ArgExp))
if (UOp->getOpcode() == UO_AddrOf)
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(UOp->getSubExpr()))
if (DRE->getDecl()->isCXXInstanceMember())
ArgTy = DRE->getDecl()->getType();
// First see if we can just cast to record type, or pointer to record type.
const RecordType *RT = getRecordType(ArgTy);
// Now check if we index into a record type function param.
if(!RT && ParamIdxOk) {
FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
IntegerLiteral *IL = dyn_cast<IntegerLiteral>(ArgExp);
if(FD && IL) {
unsigned int NumParams = FD->getNumParams();
llvm::APInt ArgValue = IL->getValue();
uint64_t ParamIdxFromOne = ArgValue.getZExtValue();
uint64_t ParamIdxFromZero = ParamIdxFromOne - 1;
if(!ArgValue.isStrictlyPositive() || ParamIdxFromOne > NumParams) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_range)
<< Attr.getName() << Idx + 1 << NumParams;
continue;
}
ArgTy = FD->getParamDecl(ParamIdxFromZero)->getType();
}
}
// If the type does not have a capability, see if the components of the
// expression have capabilities. This allows for writing C code where the
// capability may be on the type, and the expression is a capability
// boolean logic expression. Eg) requires_capability(A || B && !C)
if (!typeHasCapability(S, ArgTy) && !isCapabilityExpr(S, ArgExp))
S.Diag(Attr.getLoc(), diag::warn_thread_attribute_argument_not_lockable)
<< Attr.getName() << ArgTy;
Args.push_back(ArgExp);
}
}
//===----------------------------------------------------------------------===//
// Attribute Implementations
//===----------------------------------------------------------------------===//
// FIXME: All this manual attribute parsing code is gross. At the
// least add some helper functions to check most argument patterns (#
// and types of args).
static void handlePtGuardedVarAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!threadSafetyCheckIsPointer(S, D, Attr))
return;
D->addAttr(::new (S.Context)
PtGuardedVarAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static bool checkGuardedByAttrCommon(Sema &S, Decl *D,
const AttributeList &Attr,
Expr* &Arg) {
SmallVector<Expr*, 1> Args;
// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
unsigned Size = Args.size();
if (Size != 1)
return false;
Arg = Args[0];
return true;
}
static void handleGuardedByAttr(Sema &S, Decl *D, const AttributeList &Attr) {
Expr *Arg = 0;
if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
return;
D->addAttr(::new (S.Context) GuardedByAttr(Attr.getRange(), S.Context, Arg,
Attr.getAttributeSpellingListIndex()));
}
static void handlePtGuardedByAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
Expr *Arg = 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,
Attr.getAttributeSpellingListIndex()));
}
static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D,
const AttributeList &Attr,
SmallVectorImpl<Expr *> &Args) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
return false;
// Check that this attribute only applies to lockable types.
QualType QT = cast<ValueDecl>(D)->getType();
if (!QT->isDependentType()) {
const RecordType *RT = getRecordType(QT);
if (!RT || !RT->getDecl()->hasAttr<CapabilityAttr>()) {
S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_lockable)
<< Attr.getName();
return false;
}
}
// Check that all arguments are lockable objects.
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
if (Args.empty())
return false;
return true;
}
static void handleAcquiredAfterAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
return;
Expr **StartArg = &Args[0];
D->addAttr(::new (S.Context)
AcquiredAfterAttr(Attr.getRange(), S.Context,
StartArg, Args.size(),
Attr.getAttributeSpellingListIndex()));
}
static void handleAcquiredBeforeAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
return;
Expr **StartArg = &Args[0];
D->addAttr(::new (S.Context)
AcquiredBeforeAttr(Attr.getRange(), S.Context,
StartArg, Args.size(),
Attr.getAttributeSpellingListIndex()));
}
static bool checkLockFunAttrCommon(Sema &S, Decl *D,
const AttributeList &Attr,
SmallVectorImpl<Expr *> &Args) {
// zero or more arguments ok
// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true);
return true;
}
static void handleAssertSharedLockAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkLockFunAttrCommon(S, D, Attr, Args))
return;
unsigned Size = Args.size();
Expr **StartArg = Size == 0 ? 0 : &Args[0];
D->addAttr(::new (S.Context)
AssertSharedLockAttr(Attr.getRange(), S.Context, StartArg, Size,
Attr.getAttributeSpellingListIndex()));
}
static void handleAssertExclusiveLockAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkLockFunAttrCommon(S, D, Attr, Args))
return;
unsigned Size = Args.size();
Expr **StartArg = Size == 0 ? 0 : &Args[0];
D->addAttr(::new (S.Context)
AssertExclusiveLockAttr(Attr.getRange(), S.Context,
StartArg, Size,
Attr.getAttributeSpellingListIndex()));
}
static bool checkTryLockFunAttrCommon(Sema &S, Decl *D,
const AttributeList &Attr,
SmallVectorImpl<Expr *> &Args) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
return false;
if (!isIntOrBool(Attr.getArgAsExpr(0))) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
<< Attr.getName() << 1 << AANT_ArgumentIntOrBool;
return false;
}
// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 1);
return true;
}
static void handleSharedTrylockFunctionAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
SmallVector<Expr*, 2> Args;
if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
return;
D->addAttr(::new (S.Context)
SharedTrylockFunctionAttr(Attr.getRange(), S.Context,
Attr.getArgAsExpr(0),
Args.data(), Args.size(),
Attr.getAttributeSpellingListIndex()));
}
static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
SmallVector<Expr*, 2> Args;
if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
return;
D->addAttr(::new (S.Context)
ExclusiveTrylockFunctionAttr(Attr.getRange(), S.Context,
Attr.getArgAsExpr(0),
Args.data(), Args.size(),
Attr.getAttributeSpellingListIndex()));
}
static void handleLockReturnedAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
// check that the argument is lockable object
SmallVector<Expr*, 1> Args;
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
unsigned Size = Args.size();
if (Size == 0)
return;
D->addAttr(::new (S.Context)
LockReturnedAttr(Attr.getRange(), S.Context, Args[0],
Attr.getAttributeSpellingListIndex()));
}
static void handleLocksExcludedAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
return;
// check that all arguments are lockable objects
SmallVector<Expr*, 1> Args;
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
unsigned Size = Args.size();
if (Size == 0)
return;
Expr **StartArg = &Args[0];
D->addAttr(::new (S.Context)
LocksExcludedAttr(Attr.getRange(), S.Context, StartArg, Size,
Attr.getAttributeSpellingListIndex()));
}
static void handleEnableIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
Expr *Cond = Attr.getArgAsExpr(0);
if (!Cond->isTypeDependent()) {
ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
if (Converted.isInvalid())
return;
Cond = Converted.take();
}
StringRef Msg;
if (!S.checkStringLiteralArgumentAttr(Attr, 1, Msg))
return;
SmallVector<PartialDiagnosticAt, 8> Diags;
if (!Cond->isValueDependent() &&
!Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(D),
Diags)) {
S.Diag(Attr.getLoc(), diag::err_enable_if_never_constant_expr);
for (int I = 0, N = Diags.size(); I != N; ++I)
S.Diag(Diags[I].first, Diags[I].second);
return;
}
D->addAttr(::new (S.Context)
EnableIfAttr(Attr.getRange(), S.Context, Cond, Msg,
Attr.getAttributeSpellingListIndex()));
}
static void handleConsumableAttr(Sema &S, Decl *D, const AttributeList &Attr) {
ConsumableAttr::ConsumedState DefaultState;
if (Attr.isArgIdent(0)) {
IdentifierLoc *IL = Attr.getArgAsIdent(0);
if (!ConsumableAttr::ConvertStrToConsumedState(IL->Ident->getName(),
DefaultState)) {
S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
<< Attr.getName() << IL->Ident;
return;
}
} else {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
<< Attr.getName() << AANT_ArgumentIdentifier;
return;
}
D->addAttr(::new (S.Context)
ConsumableAttr(Attr.getRange(), S.Context, DefaultState,
Attr.getAttributeSpellingListIndex()));
}
static bool checkForConsumableClass(Sema &S, const CXXMethodDecl *MD,
const AttributeList &Attr) {
ASTContext &CurrContext = S.getASTContext();
QualType ThisType = MD->getThisType(CurrContext)->getPointeeType();
if (const CXXRecordDecl *RD = ThisType->getAsCXXRecordDecl()) {
if (!RD->hasAttr<ConsumableAttr>()) {
S.Diag(Attr.getLoc(), diag::warn_attr_on_unconsumable_class) <<
RD->getNameAsString();
return false;
}
}
return true;
}
static void handleCallableWhenAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
return;
if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
return;
SmallVector<CallableWhenAttr::ConsumedState, 3> States;
for (unsigned ArgIndex = 0; ArgIndex < Attr.getNumArgs(); ++ArgIndex) {
CallableWhenAttr::ConsumedState CallableState;
StringRef StateString;
SourceLocation Loc;
if (!S.checkStringLiteralArgumentAttr(Attr, ArgIndex, StateString, &Loc))
return;
if (!CallableWhenAttr::ConvertStrToConsumedState(StateString,
CallableState)) {
S.Diag(Loc, diag::warn_attribute_type_not_supported)
<< Attr.getName() << StateString;
return;
}
States.push_back(CallableState);
}
D->addAttr(::new (S.Context)
CallableWhenAttr(Attr.getRange(), S.Context, States.data(),
States.size(), Attr.getAttributeSpellingListIndex()));
}
static void handleParamTypestateAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!checkAttributeNumArgs(S, Attr, 1)) return;
ParamTypestateAttr::ConsumedState ParamState;
if (Attr.isArgIdent(0)) {
IdentifierLoc *Ident = Attr.getArgAsIdent(0);
StringRef StateString = Ident->Ident->getName();
if (!ParamTypestateAttr::ConvertStrToConsumedState(StateString,
ParamState)) {
S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
<< Attr.getName() << StateString;
return;
}
} else {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
Attr.getName() << AANT_ArgumentIdentifier;
return;
}
// FIXME: This check is currently being done in the analysis. It can be
// enabled here only after the parser propagates attributes at
// template specialization definition, not declaration.
//QualType ReturnType = cast<ParmVarDecl>(D)->getType();
//const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
//
//if (!RD || !RD->hasAttr<ConsumableAttr>()) {
// S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
// ReturnType.getAsString();
// return;
//}
D->addAttr(::new (S.Context)
ParamTypestateAttr(Attr.getRange(), S.Context, ParamState,
Attr.getAttributeSpellingListIndex()));
}
static void handleReturnTypestateAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!checkAttributeNumArgs(S, Attr, 1)) return;
ReturnTypestateAttr::ConsumedState ReturnState;
if (Attr.isArgIdent(0)) {
IdentifierLoc *IL = Attr.getArgAsIdent(0);
if (!ReturnTypestateAttr::ConvertStrToConsumedState(IL->Ident->getName(),
ReturnState)) {
S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
<< Attr.getName() << IL->Ident;
return;
}
} else {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
Attr.getName() << AANT_ArgumentIdentifier;
return;
}
// FIXME: This check is currently being done in the analysis. It can be
// enabled here only after the parser propagates attributes at
// template specialization definition, not declaration.
//QualType ReturnType;
//
//if (const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D)) {
// ReturnType = Param->getType();
//
//} else if (const CXXConstructorDecl *Constructor =
// dyn_cast<CXXConstructorDecl>(D)) {
// ReturnType = Constructor->getThisType(S.getASTContext())->getPointeeType();
//
//} else {
//
// ReturnType = cast<FunctionDecl>(D)->getCallResultType();
//}
//
//const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
//
//if (!RD || !RD->hasAttr<ConsumableAttr>()) {
// S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
// ReturnType.getAsString();
// return;
//}
D->addAttr(::new (S.Context)
ReturnTypestateAttr(Attr.getRange(), S.Context, ReturnState,
Attr.getAttributeSpellingListIndex()));
}
static void handleSetTypestateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!checkAttributeNumArgs(S, Attr, 1))
return;
if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
return;
SetTypestateAttr::ConsumedState NewState;
if (Attr.isArgIdent(0)) {
IdentifierLoc *Ident = Attr.getArgAsIdent(0);
StringRef Param = Ident->Ident->getName();
if (!SetTypestateAttr::ConvertStrToConsumedState(Param, NewState)) {
S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
<< Attr.getName() << Param;
return;
}
} else {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
Attr.getName() << AANT_ArgumentIdentifier;
return;
}
D->addAttr(::new (S.Context)
SetTypestateAttr(Attr.getRange(), S.Context, NewState,
Attr.getAttributeSpellingListIndex()));
}
static void handleTestTypestateAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!checkAttributeNumArgs(S, Attr, 1))
return;
if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
return;
TestTypestateAttr::ConsumedState TestState;
if (Attr.isArgIdent(0)) {
IdentifierLoc *Ident = Attr.getArgAsIdent(0);
StringRef Param = Ident->Ident->getName();
if (!TestTypestateAttr::ConvertStrToConsumedState(Param, TestState)) {
S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
<< Attr.getName() << Param;
return;
}
} else {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
Attr.getName() << AANT_ArgumentIdentifier;
return;
}
D->addAttr(::new (S.Context)
TestTypestateAttr(Attr.getRange(), S.Context, TestState,
Attr.getAttributeSpellingListIndex()));
}
static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D,
const AttributeList &Attr) {
// Remember this typedef decl, we will need it later for diagnostics.
S.ExtVectorDecls.push_back(cast<TypedefNameDecl>(D));
}
static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (TagDecl *TD = dyn_cast<TagDecl>(D))
TD->addAttr(::new (S.Context) PackedAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
// If the alignment is less than or equal to 8 bits, the packed attribute
// has no effect.
if (!FD->getType()->isDependentType() &&
!FD->getType()->isIncompleteType() &&
S.Context.getTypeAlign(FD->getType()) <= 8)
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored_for_field_of_type)
<< Attr.getName() << FD->getType();
else
FD->addAttr(::new (S.Context)
PackedAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
} else
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
}
static bool checkIBOutletCommon(Sema &S, Decl *D, const AttributeList &Attr) {
// The IBOutlet/IBOutletCollection attributes only apply to instance
// variables or properties of Objective-C classes. The outlet must also
// have an object reference type.
if (const ObjCIvarDecl *VD = dyn_cast<ObjCIvarDecl>(D)) {
if (!VD->getType()->getAs<ObjCObjectPointerType>()) {
S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
<< Attr.getName() << VD->getType() << 0;
return false;
}
}
else if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
if (!PD->getType()->getAs<ObjCObjectPointerType>()) {
S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
<< Attr.getName() << PD->getType() << 1;
return false;
}
}
else {
S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName();
return false;
}
return true;
}
static void handleIBOutlet(Sema &S, Decl *D, const AttributeList &Attr) {
if (!checkIBOutletCommon(S, D, Attr))
return;
D->addAttr(::new (S.Context)
IBOutletAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleIBOutletCollection(Sema &S, Decl *D,
const AttributeList &Attr) {
// The iboutletcollection attribute can have zero or one arguments.
if (Attr.getNumArgs() > 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
<< Attr.getName() << 1;
return;
}
if (!checkIBOutletCommon(S, D, Attr))
return;
ParsedType PT;
if (Attr.hasParsedType())
PT = Attr.getTypeArg();
else {
PT = S.getTypeName(S.Context.Idents.get("NSObject"), Attr.getLoc(),
S.getScopeForContext(D->getDeclContext()->getParent()));
if (!PT) {
S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << "NSObject";
return;
}
}
TypeSourceInfo *QTLoc = 0;
QualType QT = S.GetTypeFromParser(PT, &QTLoc);
if (!QTLoc)
QTLoc = S.Context.getTrivialTypeSourceInfo(QT, Attr.getLoc());
// Diagnose use of non-object type in iboutletcollection attribute.
// FIXME. Gnu attribute extension ignores use of builtin types in
// attributes. So, __attribute__((iboutletcollection(char))) will be
// treated as __attribute__((iboutletcollection())).
if (!QT->isObjCIdType() && !QT->isObjCObjectType()) {
S.Diag(Attr.getLoc(),
QT->isBuiltinType() ? diag::err_iboutletcollection_builtintype
: diag::err_iboutletcollection_type) << QT;
return;
}
D->addAttr(::new (S.Context)
IBOutletCollectionAttr(Attr.getRange(), S.Context, QTLoc,
Attr.getAttributeSpellingListIndex()));
}
static void possibleTransparentUnionPointerType(QualType &T) {
if (const RecordType *UT = T->getAsUnionType())
if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) {
RecordDecl *UD = UT->getDecl();
for (const auto *I : UD->fields()) {
QualType QT = I->getType();
if (QT->isAnyPointerType() || QT->isBlockPointerType()) {
T = QT;
return;
}
}
}
}
static bool attrNonNullArgCheck(Sema &S, QualType T, const AttributeList &Attr,
SourceRange R, bool isReturnValue = false) {
T = T.getNonReferenceType();
possibleTransparentUnionPointerType(T);
if (!T->isAnyPointerType() && !T->isBlockPointerType()) {
S.Diag(Attr.getLoc(),
isReturnValue ? diag::warn_attribute_return_pointers_only
: diag::warn_attribute_pointers_only)
<< Attr.getName() << R;
return false;
}
return true;
}
static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) {
SmallVector<unsigned, 8> NonNullArgs;
for (unsigned i = 0; i < Attr.getNumArgs(); ++i) {
Expr *Ex = Attr.getArgAsExpr(i);
uint64_t Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, Attr, i + 1, Ex, Idx))
return;
// Is the function argument a pointer type?
// FIXME: Should also highlight argument in decl in the diagnostic.
if (!attrNonNullArgCheck(S, getFunctionOrMethodParamType(D, Idx), Attr,
Ex->getSourceRange()))
continue;
NonNullArgs.push_back(Idx);
}
// If no arguments were specified to __attribute__((nonnull)) then all pointer
// arguments have a nonnull attribute.
if (NonNullArgs.empty()) {
for (unsigned i = 0, e = getFunctionOrMethodNumParams(D); i != e; ++i) {
QualType T = getFunctionOrMethodParamType(D, i).getNonReferenceType();
possibleTransparentUnionPointerType(T);
if (T->isAnyPointerType() || T->isBlockPointerType())
NonNullArgs.push_back(i);
}
// No pointer arguments?
if (NonNullArgs.empty()) {
// Warn the trivial case only if attribute is not coming from a
// macro instantiation.
if (Attr.getLoc().isFileID())
S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers);
return;
}
}
unsigned *start = &NonNullArgs[0];
unsigned size = NonNullArgs.size();
llvm::array_pod_sort(start, start + size);
D->addAttr(::new (S.Context)
NonNullAttr(Attr.getRange(), S.Context, start, size,
Attr.getAttributeSpellingListIndex()));
}
static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
const AttributeList &Attr) {
if (Attr.getNumArgs() > 0) {
if (D->getFunctionType()) {
handleNonNullAttr(S, D, Attr);
} else {
S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_parm_no_args)
<< D->getSourceRange();
}
return;
}
// Is the argument a pointer type?
if (!attrNonNullArgCheck(S, D->getType(), Attr, D->getSourceRange()))
return;
D->addAttr(::new (S.Context)
NonNullAttr(Attr.getRange(), S.Context, 0, 0,
Attr.getAttributeSpellingListIndex()));
}
static void handleReturnsNonNullAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
QualType ResultType = getFunctionOrMethodResultType(D);
if (!attrNonNullArgCheck(S, ResultType, Attr, Attr.getRange(),
/* isReturnValue */ true))
return;
D->addAttr(::new (S.Context)
ReturnsNonNullAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
// This attribute must be applied to a function declaration. The first
// argument to the attribute must be an identifier, the name of the resource,
// for example: malloc. The following arguments must be argument indexes, the
// arguments must be of integer type for Returns, otherwise of pointer type.
// The difference between Holds and Takes is that a pointer may still be used
// after being held. free() should be __attribute((ownership_takes)), whereas
// a list append function may well be __attribute((ownership_holds)).
if (!AL.isArgIdent(0)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
<< AL.getName() << 1 << AANT_ArgumentIdentifier;
return;
}
// Figure out our Kind.
OwnershipAttr::OwnershipKind K =
OwnershipAttr(AL.getLoc(), S.Context, 0, 0, 0,
AL.getAttributeSpellingListIndex()).getOwnKind();
// Check arguments.
switch (K) {
case OwnershipAttr::Takes:
case OwnershipAttr::Holds:
if (AL.getNumArgs() < 2) {
S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments)
<< AL.getName() << 2;
return;
}
break;
case OwnershipAttr::Returns:
if (AL.getNumArgs() > 2) {
S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments)
<< AL.getName() << 1;
return;
}
break;
}
IdentifierInfo *Module = AL.getArgAsIdent(0)->Ident;
// Normalize the argument, __foo__ becomes foo.
StringRef ModuleName = Module->getName();
if (ModuleName.startswith("__") && ModuleName.endswith("__") &&
ModuleName.size() > 4) {
ModuleName = ModuleName.drop_front(2).drop_back(2);
Module = &S.PP.getIdentifierTable().get(ModuleName);
}
SmallVector<unsigned, 8> OwnershipArgs;
for (unsigned i = 1; i < AL.getNumArgs(); ++i) {
Expr *Ex = AL.getArgAsExpr(i);
uint64_t Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, i, Ex, Idx))
return;
// Is the function argument a pointer type?
QualType T = getFunctionOrMethodParamType(D, Idx);
int Err = -1; // No error
switch (K) {
case OwnershipAttr::Takes:
case OwnershipAttr::Holds:
if (!T->isAnyPointerType() && !T->isBlockPointerType())
Err = 0;
break;
case OwnershipAttr::Returns:
if (!T->isIntegerType())
Err = 1;
break;
}
if (-1 != Err) {
S.Diag(AL.getLoc(), diag::err_ownership_type) << AL.getName() << Err
<< Ex->getSourceRange();
return;
}
// Check we don't have a conflict with another ownership attribute.
for (const auto *I : D->specific_attrs<OwnershipAttr>()) {
// FIXME: A returns attribute should conflict with any returns attribute
// with a different index too.
if (I->getOwnKind() != K && I->args_end() !=
std::find(I->args_begin(), I->args_end(), Idx)) {
S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
<< AL.getName() << I;
return;
}
}
OwnershipArgs.push_back(Idx);
}
unsigned* start = OwnershipArgs.data();
unsigned size = OwnershipArgs.size();
llvm::array_pod_sort(start, start + size);
D->addAttr(::new (S.Context)
OwnershipAttr(AL.getLoc(), S.Context, Module, start, size,
AL.getAttributeSpellingListIndex()));
}
static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Check the attribute arguments.
if (Attr.getNumArgs() > 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
<< Attr.getName() << 1;
return;
}
NamedDecl *nd = cast<NamedDecl>(D);
// gcc rejects
// class c {
// static int a __attribute__((weakref ("v2")));
// static int b() __attribute__((weakref ("f3")));
// };
// and ignores the attributes of
// void f(void) {
// static int a __attribute__((weakref ("v2")));
// }
// we reject them
const DeclContext *Ctx = D->getDeclContext()->getRedeclContext();
if (!Ctx->isFileContext()) {
S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_global_context)
<< nd;
return;
}
// The GCC manual says
//
// At present, a declaration to which `weakref' is attached can only
// be `static'.
//
// It also says
//
// Without a TARGET,
// given as an argument to `weakref' or to `alias', `weakref' is
// equivalent to `weak'.
//
// gcc 4.4.1 will accept
// int a7 __attribute__((weakref));
// as
// int a7 __attribute__((weak));
// This looks like a bug in gcc. We reject that for now. We should revisit
// it if this behaviour is actually used.
// GCC rejects
// static ((alias ("y"), weakref)).
// Should we? How to check that weakref is before or after alias?
// FIXME: it would be good for us to keep the WeakRefAttr as-written instead
// of transforming it into an AliasAttr. The WeakRefAttr never uses the
// StringRef parameter it was given anyway.
StringRef Str;
if (Attr.getNumArgs() && S.checkStringLiteralArgumentAttr(Attr, 0, Str))
// GCC will accept anything as the argument of weakref. Should we
// check for an existing decl?
D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
Attr.getAttributeSpellingListIndex()));
D->addAttr(::new (S.Context)
WeakRefAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) {
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
return;
if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_darwin);
return;
}
// FIXME: check if target symbol exists in current file
D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
Attr.getAttributeSpellingListIndex()));
}
static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<HotAttr>(S, D, Attr))
return;
D->addAttr(::new (S.Context) ColdAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<ColdAttr>(S, D, Attr))
return;
D->addAttr(::new (S.Context) HotAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleTLSModelAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
StringRef Model;
SourceLocation LiteralLoc;
// Check that it is a string.
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Model, &LiteralLoc))
return;
// Check that the value.
if (Model != "global-dynamic" && Model != "local-dynamic"
&& Model != "initial-exec" && Model != "local-exec") {
S.Diag(LiteralLoc, diag::err_attr_tlsmodel_arg);
return;
}
D->addAttr(::new (S.Context)
TLSModelAttr(Attr.getRange(), S.Context, Model,
Attr.getAttributeSpellingListIndex()));
}
static void handleMallocAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
QualType RetTy = FD->getReturnType();
if (RetTy->isAnyPointerType() || RetTy->isBlockPointerType()) {
D->addAttr(::new (S.Context)
MallocAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
return;
}
}
S.Diag(Attr.getLoc(), diag::warn_attribute_malloc_pointer_only);
}
static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (S.LangOpts.CPlusPlus) {
S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
<< Attr.getName() << AttributeLangSupport::Cpp;
return;
}
D->addAttr(::new (S.Context) CommonAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &attr) {
if (hasDeclarator(D)) return;
if (S.CheckNoReturnAttr(attr)) return;
if (!isa<ObjCMethodDecl>(D)) {
S.Diag(attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< attr.getName() << ExpectedFunctionOrMethod;
return;
}
D->addAttr(::new (S.Context)
NoReturnAttr(attr.getRange(), S.Context,
attr.getAttributeSpellingListIndex()));
}
bool Sema::CheckNoReturnAttr(const AttributeList &attr) {
if (!checkAttributeNumArgs(*this, attr, 0)) {
attr.setInvalid();
return true;
}
return false;
}
static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
// The checking path for 'noreturn' and 'analyzer_noreturn' are different
// because 'analyzer_noreturn' does not impact the type.
if (!isFunctionOrMethod(D) && !isa<BlockDecl>(D)) {
ValueDecl *VD = dyn_cast<ValueDecl>(D);
if (VD == 0 || (!VD->getType()->isBlockPointerType()
&& !VD->getType()->isFunctionPointerType())) {
S.Diag(Attr.getLoc(),
Attr.isCXX11Attribute() ? diag::err_attribute_wrong_decl_type
: diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedFunctionMethodOrBlock;
return;
}
}
D->addAttr(::new (S.Context)
AnalyzerNoReturnAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
// PS3 PPU-specific.
static void handleVecReturnAttr(Sema &S, Decl *D, const AttributeList &Attr) {
/*
Returning a Vector Class in Registers
According to the PPU ABI specifications, a class with a single member of
vector type is returned in memory when used as the return value of a function.
This results in inefficient code when implementing vector classes. To return
the value in a single vector register, add the vecreturn attribute to the
class definition. This attribute is also applicable to struct types.
Example:
struct Vector
{
__vector float xyzw;
} __attribute__((vecreturn));
Vector Add(Vector lhs, Vector rhs)
{
Vector result;
result.xyzw = vec_add(lhs.xyzw, rhs.xyzw);
return result; // This will be returned in a register
}
*/
if (VecReturnAttr *A = D->getAttr<VecReturnAttr>()) {
S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << A;
return;
}
RecordDecl *record = cast<RecordDecl>(D);
int count = 0;
if (!isa<CXXRecordDecl>(record)) {
S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
return;
}
if (!cast<CXXRecordDecl>(record)->isPOD()) {
S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_pod_record);
return;
}
for (const auto *I : record->fields()) {
if ((count == 1) || !I->getType()->isVectorType()) {
S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
return;
}
count++;
}
D->addAttr(::new (S.Context)
VecReturnAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleDependencyAttr(Sema &S, Scope *Scope, Decl *D,
const AttributeList &Attr) {
if (isa<ParmVarDecl>(D)) {
// [[carries_dependency]] can only be applied to a parameter if it is a
// parameter of a function declaration or lambda.
if (!(Scope->getFlags() & clang::Scope::FunctionDeclarationScope)) {
S.Diag(Attr.getLoc(),
diag::err_carries_dependency_param_not_function_decl);
return;
}
}
D->addAttr(::new (S.Context) CarriesDependencyAttr(
Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
if (VD->hasLocalStorage()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
return;
}
} else if (!isFunctionOrMethod(D)) {
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedVariableOrFunction;
return;
}
D->addAttr(::new (S.Context)
UsedAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (Attr.getNumArgs() > 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
<< Attr.getName() << 1;
return;
}
uint32_t priority = ConstructorAttr::DefaultPriority;
if (Attr.getNumArgs() > 0 &&
!checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
return;
D->addAttr(::new (S.Context)
ConstructorAttr(Attr.getRange(), S.Context, priority,
Attr.getAttributeSpellingListIndex()));
}
static void handleDestructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (Attr.getNumArgs() > 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
<< Attr.getName() << 1;
return;
}
uint32_t priority = DestructorAttr::DefaultPriority;
if (Attr.getNumArgs() > 0 &&
!checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
return;
D->addAttr(::new (S.Context)
DestructorAttr(Attr.getRange(), S.Context, priority,
Attr.getAttributeSpellingListIndex()));
}
template <typename AttrTy>
static void handleAttrWithMessage(Sema &S, Decl *D,
const AttributeList &Attr) {
unsigned NumArgs = Attr.getNumArgs();
if (NumArgs > 1) {
S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
<< Attr.getName() << 1;
return;
}
// Handle the case where the attribute has a text message.
StringRef Str;
if (NumArgs == 1 && !S.checkStringLiteralArgumentAttr(Attr, 0, Str))
return;
D->addAttr(::new (S.Context) AttrTy(Attr.getRange(), S.Context, Str,
Attr.getAttributeSpellingListIndex()));
}
static void handleObjCSuppresProtocolAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!cast<ObjCProtocolDecl>(D)->isThisDeclarationADefinition()) {
S.Diag(Attr.getLoc(), diag::err_objc_attr_protocol_requires_definition)
<< Attr.getName() << Attr.getRange();
return;
}
D->addAttr(::new (S.Context)
ObjCExplicitProtocolImplAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static bool checkAvailabilityAttr(Sema &S, SourceRange Range,
IdentifierInfo *Platform,
VersionTuple Introduced,
VersionTuple Deprecated,
VersionTuple Obsoleted) {
StringRef PlatformName
= AvailabilityAttr::getPrettyPlatformName(Platform->getName());
if (PlatformName.empty())
PlatformName = Platform->getName();
// Ensure that Introduced <= Deprecated <= Obsoleted (although not all
// of these steps are needed).
if (!Introduced.empty() && !Deprecated.empty() &&
!(Introduced <= Deprecated)) {
S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
<< 1 << PlatformName << Deprecated.getAsString()
<< 0 << Introduced.getAsString();
return true;
}
if (!Introduced.empty() && !Obsoleted.empty() &&
!(Introduced <= Obsoleted)) {
S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
<< 2 << PlatformName << Obsoleted.getAsString()
<< 0 << Introduced.getAsString();
return true;
}
if (!Deprecated.empty() && !Obsoleted.empty() &&
!(Deprecated <= Obsoleted)) {
S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
<< 2 << PlatformName << Obsoleted.getAsString()
<< 1 << Deprecated.getAsString();
return true;
}
return false;
}
/// \brief Check whether the two versions match.
///
/// If either version tuple is empty, then they are assumed to match. If
/// \p BeforeIsOkay is true, then \p X can be less than or equal to \p Y.
static bool versionsMatch(const VersionTuple &X, const VersionTuple &Y,
bool BeforeIsOkay) {
if (X.empty() || Y.empty())
return true;
if (X == Y)
return true;
if (BeforeIsOkay && X < Y)
return true;
return false;
}
AvailabilityAttr *Sema::mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
IdentifierInfo *Platform,
VersionTuple Introduced,
VersionTuple Deprecated,
VersionTuple Obsoleted,
bool IsUnavailable,
StringRef Message,
bool Override,
unsigned AttrSpellingListIndex) {
VersionTuple MergedIntroduced = Introduced;
VersionTuple MergedDeprecated = Deprecated;
VersionTuple MergedObsoleted = Obsoleted;
bool FoundAny = false;
if (D->hasAttrs()) {
AttrVec &Attrs = D->getAttrs();
for (unsigned i = 0, e = Attrs.size(); i != e;) {
const AvailabilityAttr *OldAA = dyn_cast<AvailabilityAttr>(Attrs[i]);
if (!OldAA) {
++i;
continue;
}
IdentifierInfo *OldPlatform = OldAA->getPlatform();
if (OldPlatform != Platform) {
++i;
continue;
}
FoundAny = true;
VersionTuple OldIntroduced = OldAA->getIntroduced();
VersionTuple OldDeprecated = OldAA->getDeprecated();
VersionTuple OldObsoleted = OldAA->getObsoleted();
bool OldIsUnavailable = OldAA->getUnavailable();
if (!versionsMatch(OldIntroduced, Introduced, Override) ||
!versionsMatch(Deprecated, OldDeprecated, Override) ||
!versionsMatch(Obsoleted, OldObsoleted, Override) ||
!(OldIsUnavailable == IsUnavailable ||
(Override && !OldIsUnavailable && IsUnavailable))) {
if (Override) {
int Which = -1;
VersionTuple FirstVersion;
VersionTuple SecondVersion;
if (!versionsMatch(OldIntroduced, Introduced, Override)) {
Which = 0;
FirstVersion = OldIntroduced;
SecondVersion = Introduced;
} else if (!versionsMatch(Deprecated, OldDeprecated, Override)) {
Which = 1;
FirstVersion = Deprecated;
SecondVersion = OldDeprecated;
} else if (!versionsMatch(Obsoleted, OldObsoleted, Override)) {
Which = 2;
FirstVersion = Obsoleted;
SecondVersion = OldObsoleted;
}
if (Which == -1) {
Diag(OldAA->getLocation(),
diag::warn_mismatched_availability_override_unavail)
<< AvailabilityAttr::getPrettyPlatformName(Platform->getName());
} else {
Diag(OldAA->getLocation(),
diag::warn_mismatched_availability_override)
<< Which
<< AvailabilityAttr::getPrettyPlatformName(Platform->getName())
<< FirstVersion.getAsString() << SecondVersion.getAsString();
}
Diag(Range.getBegin(), diag::note_overridden_method);
} else {
Diag(OldAA->getLocation(), diag::warn_mismatched_availability);
Diag(Range.getBegin(), diag::note_previous_attribute);
}
Attrs.erase(Attrs.begin() + i);
--e;
continue;
}
VersionTuple MergedIntroduced2 = MergedIntroduced;
VersionTuple MergedDeprecated2 = MergedDeprecated;
VersionTuple MergedObsoleted2 = MergedObsoleted;
if (MergedIntroduced2.empty())
MergedIntroduced2 = OldIntroduced;
if (MergedDeprecated2.empty())
MergedDeprecated2 = OldDeprecated;
if (MergedObsoleted2.empty())
MergedObsoleted2 = OldObsoleted;
if (checkAvailabilityAttr(*this, OldAA->getRange(), Platform,
MergedIntroduced2, MergedDeprecated2,
MergedObsoleted2)) {
Attrs.erase(Attrs.begin() + i);
--e;
continue;
}
MergedIntroduced = MergedIntroduced2;
MergedDeprecated = MergedDeprecated2;
MergedObsoleted = MergedObsoleted2;
++i;
}
}
if (FoundAny &&
MergedIntroduced == Introduced &&
MergedDeprecated == Deprecated &&
MergedObsoleted == Obsoleted)
return NULL;
// Only create a new attribute if !Override, but we want to do
// the checking.
if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
MergedDeprecated, MergedObsoleted) &&
!Override) {
return ::new (Context) AvailabilityAttr(Range, Context, Platform,
Introduced, Deprecated,
Obsoleted, IsUnavailable, Message,
AttrSpellingListIndex);
}
return NULL;
}
static void handleAvailabilityAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!checkAttributeNumArgs(S, Attr, 1))
return;
IdentifierLoc *Platform = Attr.getArgAsIdent(0);
unsigned Index = Attr.getAttributeSpellingListIndex();
IdentifierInfo *II = Platform->Ident;
if (AvailabilityAttr::getPrettyPlatformName(II->getName()).empty())
S.Diag(Platform->Loc, diag::warn_availability_unknown_platform)
<< Platform->Ident;
NamedDecl *ND = dyn_cast<NamedDecl>(D);
if (!ND) {
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
return;
}
AvailabilityChange Introduced = Attr.getAvailabilityIntroduced();
AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated();
AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted();
bool IsUnavailable = Attr.getUnavailableLoc().isValid();
StringRef Str;
if (const StringLiteral *SE =
dyn_cast_or_null<StringLiteral>(Attr.getMessageExpr()))
Str = SE->getString();
AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND, Attr.getRange(), II,
Introduced.Version,
Deprecated.Version,
Obsoleted.Version,
IsUnavailable, Str,
/*Override=*/false,
Index);
if (NewAttr)
D->addAttr(NewAttr);
}
template <class T>
static T *mergeVisibilityAttr(Sema &S, Decl *D, SourceRange range,
typename T::VisibilityType value,
unsigned attrSpellingListIndex) {
T *existingAttr = D->getAttr<T>();
if (existingAttr) {
typename T::VisibilityType existingValue = existingAttr->getVisibility();
if (existingValue == value)
return NULL;
S.Diag(existingAttr->getLocation(), diag::err_mismatched_visibility);
S.Diag(range.getBegin(), diag::note_previous_attribute);
D->dropAttr<T>();
}
return ::new (S.Context) T(range, S.Context, value, attrSpellingListIndex);
}
VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range,
VisibilityAttr::VisibilityType Vis,
unsigned AttrSpellingListIndex) {
return ::mergeVisibilityAttr<VisibilityAttr>(*this, D, Range, Vis,
AttrSpellingListIndex);
}
TypeVisibilityAttr *Sema::mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
TypeVisibilityAttr::VisibilityType Vis,
unsigned AttrSpellingListIndex) {
return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, Range, Vis,
AttrSpellingListIndex);
}
static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr,
bool isTypeVisibility) {
// Visibility attributes don't mean anything on a typedef.
if (isa<TypedefNameDecl>(D)) {
S.Diag(Attr.getRange().getBegin(), diag::warn_attribute_ignored)
<< Attr.getName();
return;
}
// 'type_visibility' can only go on a type or namespace.
if (isTypeVisibility &&
!(isa<TagDecl>(D) ||
isa<ObjCInterfaceDecl>(D) ||
isa<NamespaceDecl>(D))) {
S.Diag(Attr.getRange().getBegin(), diag::err_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedTypeOrNamespace;
return;
}
// Check that the argument is a string literal.
StringRef TypeStr;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, TypeStr, &LiteralLoc))
return;
VisibilityAttr::VisibilityType type;
if (!VisibilityAttr::ConvertStrToVisibilityType(TypeStr, type)) {
S.Diag(LiteralLoc, diag::warn_attribute_type_not_supported)
<< Attr.getName() << TypeStr;
return;
}
// Complain about attempts to use protected visibility on targets
// (like Darwin) that don't support it.
if (type == VisibilityAttr::Protected &&
!S.Context.getTargetInfo().hasProtectedVisibility()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_protected_visibility);
type = VisibilityAttr::Default;
}
unsigned Index = Attr.getAttributeSpellingListIndex();
clang::Attr *newAttr;
if (isTypeVisibility) {
newAttr = S.mergeTypeVisibilityAttr(D, Attr.getRange(),
(TypeVisibilityAttr::VisibilityType) type,
Index);
} else {
newAttr = S.mergeVisibilityAttr(D, Attr.getRange(), type, Index);
}
if (newAttr)
D->addAttr(newAttr);
}
static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl,
const AttributeList &Attr) {
ObjCMethodDecl *method = cast<ObjCMethodDecl>(decl);
if (!Attr.isArgIdent(0)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
<< Attr.getName() << 1 << AANT_ArgumentIdentifier;
return;
}
IdentifierLoc *IL = Attr.getArgAsIdent(0);
ObjCMethodFamilyAttr::FamilyKind F;
if (!ObjCMethodFamilyAttr::ConvertStrToFamilyKind(IL->Ident->getName(), F)) {
S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << Attr.getName()
<< IL->Ident;
return;
}
if (F == ObjCMethodFamilyAttr::OMF_init &&
!method->getReturnType()->isObjCObjectPointerType()) {
S.Diag(method->getLocation(), diag::err_init_method_bad_return_type)
<< method->getReturnType();
// Ignore the attribute.
return;
}
method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getRange(),
S.Context, F,
Attr.getAttributeSpellingListIndex()));
}
static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) {
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
QualType T = TD->getUnderlyingType();
if (!T->isCARCBridgableType()) {
S.Diag(TD->getLocation(), diag::err_nsobject_attribute);
return;
}
}
else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
QualType T = PD->getType();
if (!T->isCARCBridgableType()) {
S.Diag(PD->getLocation(), diag::err_nsobject_attribute);
return;
}
}
else {
// It is okay to include this attribute on properties, e.g.:
//
// @property (retain, nonatomic) struct Bork *Q __attribute__((NSObject));
//
// In this case it follows tradition and suppresses an error in the above
// case.
S.Diag(D->getLocation(), diag::warn_nsobject_attribute);
}
D->addAttr(::new (S.Context)
ObjCNSObjectAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!Attr.isArgIdent(0)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
<< Attr.getName() << 1 << AANT_ArgumentIdentifier;
return;
}
IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
BlocksAttr::BlockType type;
if (!BlocksAttr::ConvertStrToBlockType(II->getName(), type)) {
S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
<< Attr.getName() << II;
return;
}
D->addAttr(::new (S.Context)
BlocksAttr(Attr.getRange(), S.Context, type,
Attr.getAttributeSpellingListIndex()));
}
static void handleSentinelAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (Attr.getNumArgs() > 2) {
S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
<< Attr.getName() << 2;
return;
}
unsigned sentinel = (unsigned)SentinelAttr::DefaultSentinel;
if (Attr.getNumArgs() > 0) {
Expr *E = Attr.getArgAsExpr(0);
llvm::APSInt Idx(32);
if (E->isTypeDependent() || E->isValueDependent() ||
!E->isIntegerConstantExpr(Idx, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
<< Attr.getName() << 1 << AANT_ArgumentIntegerConstant
<< E->getSourceRange();
return;
}
if (Idx.isSigned() && Idx.isNegative()) {
S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero)
<< E->getSourceRange();
return;
}
sentinel = Idx.getZExtValue();
}
unsigned nullPos = (unsigned)SentinelAttr::DefaultNullPos;
if (Attr.getNumArgs() > 1) {
Expr *E = Attr.getArgAsExpr(1);
llvm::APSInt Idx(32);
if (E->isTypeDependent() || E->isValueDependent() ||
!E->isIntegerConstantExpr(Idx, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
<< Attr.getName() << 2 << AANT_ArgumentIntegerConstant
<< E->getSourceRange();
return;
}
nullPos = Idx.getZExtValue();
if ((Idx.isSigned() && Idx.isNegative()) || nullPos > 1) {
// FIXME: This error message could be improved, it would be nice
// to say what the bounds actually are.
S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one)
<< E->getSourceRange();
return;
}
}
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
const FunctionType *FT = FD->getType()->castAs<FunctionType>();
if (isa<FunctionNoProtoType>(FT)) {
S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_named_arguments);
return;
}
if (!cast<FunctionProtoType>(FT)->isVariadic()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
return;
}
} else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
if (!MD->isVariadic()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
return;
}
} else if (BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
if (!BD->isVariadic()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 1;
return;
}
} else if (const VarDecl *V = dyn_cast<VarDecl>(D)) {
QualType Ty = V->getType();
if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
const FunctionType *FT = Ty->isFunctionPointerType()
? D->getFunctionType()
: Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
if (!cast<FunctionProtoType>(FT)->isVariadic()) {
int m = Ty->isFunctionPointerType() ? 0 : 1;
S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m;
return;
}
} else {
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedFunctionMethodOrBlock;
return;
}
} else {
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedFunctionMethodOrBlock;
return;
}
D->addAttr(::new (S.Context)
SentinelAttr(Attr.getRange(), S.Context, sentinel, nullPos,
Attr.getAttributeSpellingListIndex()));
}
static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) {
if (D->getFunctionType() &&
D->getFunctionType()->getReturnType()->isVoidType()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
<< Attr.getName() << 0;
return;
}
if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
if (MD->getReturnType()->isVoidType()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
<< Attr.getName() << 1;
return;
}
D->addAttr(::new (S.Context)
WarnUnusedResultAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleWeakImportAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// weak_import only applies to variable & function declarations.
bool isDef = false;
if (!D->canBeWeakImported(isDef)) {
if (isDef)
S.Diag(Attr.getLoc(), diag::warn_attribute_invalid_on_definition)
<< "weak_import";
else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) ||
(S.Context.getTargetInfo().getTriple().isOSDarwin() &&
(isa<ObjCInterfaceDecl>(D) || isa<EnumDecl>(D)))) {
// Nothing to warn about here.
} else
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedVariableOrFunction;
return;
}
D->addAttr(::new (S.Context)
WeakImportAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
// Handles reqd_work_group_size and work_group_size_hint.
template <typename WorkGroupAttr>
static void handleWorkGroupSize(Sema &S, Decl *D,
const AttributeList &Attr) {
uint32_t WGSize[3];
for (unsigned i = 0; i < 3; ++i)
if (!checkUInt32Argument(S, Attr, Attr.getArgAsExpr(i), WGSize[i], i))
return;
WorkGroupAttr *Existing = D->getAttr<WorkGroupAttr>();
if (Existing && !(Existing->getXDim() == WGSize[0] &&
Existing->getYDim() == WGSize[1] &&
Existing->getZDim() == WGSize[2]))
S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
D->addAttr(::new (S.Context) WorkGroupAttr(Attr.getRange(), S.Context,
WGSize[0], WGSize[1], WGSize[2],
Attr.getAttributeSpellingListIndex()));
}
static void handleVecTypeHint(Sema &S, Decl *D, const AttributeList &Attr) {
if (!Attr.hasParsedType()) {
S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
<< Attr.getName() << 1;
return;
}
TypeSourceInfo *ParmTSI = 0;
QualType ParmType = S.GetTypeFromParser(Attr.getTypeArg(), &ParmTSI);
assert(ParmTSI && "no type source info for attribute argument");
if (!ParmType->isExtVectorType() && !ParmType->isFloatingType() &&
(ParmType->isBooleanType() ||
!ParmType->isIntegralType(S.getASTContext()))) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_vec_type_hint)
<< ParmType;
return;
}
if (VecTypeHintAttr *A = D->getAttr<VecTypeHintAttr>()) {
if (!S.Context.hasSameType(A->getTypeHint(), ParmType)) {
S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
return;
}
}
D->addAttr(::new (S.Context) VecTypeHintAttr(Attr.getLoc(), S.Context,
ParmTSI,
Attr.getAttributeSpellingListIndex()));
}
SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range,
StringRef Name,
unsigned AttrSpellingListIndex) {
if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) {
if (ExistingAttr->getName() == Name)
return NULL;
Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section);
Diag(Range.getBegin(), diag::note_previous_attribute);
return NULL;
}
return ::new (Context) SectionAttr(Range, Context, Name,
AttrSpellingListIndex);
}
static void handleSectionAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Make sure that there is a string literal as the sections's single
// argument.
StringRef Str;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &LiteralLoc))
return;
// If the target wants to validate the section specifier, make it happen.
std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(Str);
if (!Error.empty()) {
S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target)
<< Error;
return;
}
unsigned Index = Attr.getAttributeSpellingListIndex();
SectionAttr *NewAttr = S.mergeSectionAttr(D, Attr.getRange(), Str, Index);
if (NewAttr)
D->addAttr(NewAttr);
}
static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) {
VarDecl *VD = cast<VarDecl>(D);
if (!VD->hasLocalStorage()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
return;
}
Expr *E = Attr.getArgAsExpr(0);
SourceLocation Loc = E->getExprLoc();
FunctionDecl *FD = 0;
DeclarationNameInfo NI;
// gcc only allows for simple identifiers. Since we support more than gcc, we
// will warn the user.
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
if (DRE->hasQualifier())
S.Diag(Loc, diag::warn_cleanup_ext);
FD = dyn_cast<FunctionDecl>(DRE->getDecl());
NI = DRE->getNameInfo();
if (!FD) {
S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 1
<< NI.getName();
return;
}
} else if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
if (ULE->hasExplicitTemplateArgs())
S.Diag(Loc, diag::warn_cleanup_ext);
FD = S.ResolveSingleFunctionTemplateSpecialization(ULE, true);
NI = ULE->getNameInfo();
if (!FD) {
S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 2
<< NI.getName();
if (ULE->getType() == S.Context.OverloadTy)
S.NoteAllOverloadCandidates(ULE);
return;
}
} else {
S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 0;
return;
}
if (FD->getNumParams() != 1) {
S.Diag(Loc, diag::err_attribute_cleanup_func_must_take_one_arg)
<< NI.getName();
return;
}
// We're currently more strict than GCC about what function types we accept.
// If this ever proves to be a problem it should be easy to fix.
QualType Ty = S.Context.getPointerType(VD->getType());
QualType ParamTy = FD->getParamDecl(0)->getType();
if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(),
ParamTy, Ty) != Sema::Compatible) {
S.Diag(Loc, diag::err_attribute_cleanup_func_arg_incompatible_type)
<< NI.getName() << ParamTy << Ty;
return;
}
D->addAttr(::new (S.Context)
CleanupAttr(Attr.getRange(), S.Context, FD,
Attr.getAttributeSpellingListIndex()));
}
/// Handle __attribute__((format_arg((idx)))) attribute based on
/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &Attr) {
Expr *IdxExpr = Attr.getArgAsExpr(0);
uint64_t Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 1, IdxExpr, Idx))
return;
// make sure the format string is really a string
QualType Ty = getFunctionOrMethodParamType(D, Idx);
bool not_nsstring_type = !isNSStringType(Ty, S.Context);
if (not_nsstring_type &&
!isCFStringType(Ty, S.Context) &&
(!Ty->isPointerType() ||
!Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
// FIXME: Should highlight the actual expression that has the wrong type.
S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
<< (not_nsstring_type ? "a string type" : "an NSString")
<< IdxExpr->getSourceRange();
return;
}
Ty = getFunctionOrMethodResultType(D);
if (!isNSStringType(Ty, S.Context) &&
!isCFStringType(Ty, S.Context) &&
(!Ty->isPointerType() ||
!Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
// FIXME: Should highlight the actual expression that has the wrong type.
S.Diag(Attr.getLoc(), diag::err_format_attribute_result_not)
<< (not_nsstring_type ? "string type" : "NSString")
<< IdxExpr->getSourceRange();
return;
}
// We cannot use the Idx returned from checkFunctionOrMethodParameterIndex
// because that has corrected for the implicit this parameter, and is zero-
// based. The attribute expects what the user wrote explicitly.
llvm::APSInt Val;
IdxExpr->EvaluateAsInt(Val, S.Context);
D->addAttr(::new (S.Context)
FormatArgAttr(Attr.getRange(), S.Context, Val.getZExtValue(),
Attr.getAttributeSpellingListIndex()));
}
enum FormatAttrKind {
CFStringFormat,
NSStringFormat,
StrftimeFormat,
SupportedFormat,
IgnoredFormat,
InvalidFormat
};
/// getFormatAttrKind - Map from format attribute names to supported format
/// types.
static FormatAttrKind getFormatAttrKind(StringRef Format) {
return llvm::StringSwitch<FormatAttrKind>(Format)
// Check for formats that get handled specially.
.Case("NSString", NSStringFormat)
.Case("CFString", CFStringFormat)
.Case("strftime", StrftimeFormat)
// Otherwise, check for supported formats.
.Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
.Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
.Case("kprintf", SupportedFormat) // OpenBSD.
.Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
.Default(InvalidFormat);
}
/// Handle __attribute__((init_priority(priority))) attributes based on
/// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html
static void handleInitPriorityAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!S.getLangOpts().CPlusPlus) {
S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
return;
}
if (S.getCurFunctionOrMethodDecl()) {
S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
Attr.setInvalid();
return;
}
QualType T = cast<VarDecl>(D)->getType();
if (S.Context.getAsArrayType(T))
T = S.Context.getBaseElementType(T);
if (!T->getAs<RecordType>()) {
S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
Attr.setInvalid();
return;
}
Expr *E = Attr.getArgAsExpr(0);
uint32_t prioritynum;
if (!checkUInt32Argument(S, Attr, E, prioritynum)) {
Attr.setInvalid();
return;
}
if (prioritynum < 101 || prioritynum > 65535) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range)
<< E->getSourceRange();
Attr.setInvalid();
return;
}
D->addAttr(::new (S.Context)
InitPriorityAttr(Attr.getRange(), S.Context, prioritynum,
Attr.getAttributeSpellingListIndex()));
}
FormatAttr *Sema::mergeFormatAttr(Decl *D, SourceRange Range,
IdentifierInfo *Format, int FormatIdx,
int FirstArg,
unsigned AttrSpellingListIndex) {
// Check whether we already have an equivalent format attribute.
for (auto *F : D->specific_attrs<FormatAttr>()) {
if (F->getType() == Format &&
F->getFormatIdx() == FormatIdx &&
F->getFirstArg() == FirstArg) {
// If we don't have a valid location for this attribute, adopt the
// location.
if (F->getLocation().isInvalid())
F->setRange(Range);
return NULL;
}
}
return ::new (Context) FormatAttr(Range, Context, Format, FormatIdx,
FirstArg, AttrSpellingListIndex);
}
/// Handle __attribute__((format(type,idx,firstarg))) attributes based on
/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
static void handleFormatAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!Attr.isArgIdent(0)) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
<< Attr.getName() << 1 << AANT_ArgumentIdentifier;
return;
}
// In C++ the implicit 'this' function parameter also counts, and they are
// counted from one.
bool HasImplicitThisParam = isInstanceMethod(D);
unsigned NumArgs = getFunctionOrMethodNumParams(D) + HasImplicitThisParam;
IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
StringRef Format = II->getName();
// Normalize the argument, __foo__ becomes foo.
if (Format.startswith("__") && Format.endswith("__")) {
Format = Format.substr(2, Format.size() - 4);
// If we've modified the string name, we need a new identifier for it.
II = &S.Context.Idents.get(Format);
}
// Check for supported formats.
FormatAttrKind Kind = getFormatAttrKind(Format);
if (Kind == IgnoredFormat)
return;
if (Kind == InvalidFormat) {
S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
<< Attr.getName() << II->getName();
return;
}
// checks for the 2nd argument
Expr *IdxExpr = Attr.getArgAsExpr(1);
uint32_t Idx;
if (!checkUInt32Argument(S, Attr, IdxExpr, Idx, 2))
return;
if (Idx < 1 || Idx > NumArgs) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< Attr.getName() << 2 << IdxExpr->getSourceRange();
return;
}
// FIXME: Do we need to bounds check?
unsigned ArgIdx = Idx - 1;
if (HasImplicitThisParam) {
if (ArgIdx == 0) {
S.Diag(Attr.getLoc(),
diag::err_format_attribute_implicit_this_format_string)
<< IdxExpr->getSourceRange();
return;
}
ArgIdx--;
}
// make sure the format string is really a string
QualType Ty = getFunctionOrMethodParamType(D, ArgIdx);
if (Kind == CFStringFormat) {
if (!isCFStringType(Ty, S.Context)) {
S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
<< "a CFString" << IdxExpr->getSourceRange();
return;
}
} else if (Kind == NSStringFormat) {
// FIXME: do we need to check if the type is NSString*? What are the
// semantics?
if (!isNSStringType(Ty, S.Context)) {
// FIXME: Should highlight the actual expression that has the wrong type.
S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
<< "an NSString" << IdxExpr->getSourceRange();
return;
}
} else if (!Ty->isPointerType() ||
!Ty->getAs<PointerType>()->getPointeeType()->isCharType()) {
// FIXME: Should highlight the actual expression that has the wrong type.
S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
<< "a string type" << IdxExpr->getSourceRange();
return;
}
// check the 3rd argument
Expr *FirstArgExpr = Attr.getArgAsExpr(2);
uint32_t FirstArg;
if (!checkUInt32Argument(S, Attr, FirstArgExpr, FirstArg, 3))
return;
// check if the function is variadic if the 3rd argument non-zero
if (FirstArg != 0) {
if (isFunctionOrMethodVariadic(D)) {
++NumArgs; // +1 for ...
} else {
S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic);
return;
}
}
// strftime requires FirstArg to be 0 because it doesn't read from any
// variable the input is just the current time + the format string.
if (Kind == StrftimeFormat) {
if (FirstArg != 0) {
S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter)
<< FirstArgExpr->getSourceRange();
return;
}
// if 0 it disables parameter checking (to use with e.g. va_list)
} else if (FirstArg != 0 && FirstArg != NumArgs) {
S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< Attr.getName() << 3 << FirstArgExpr->getSourceRange();
return;
}
FormatAttr *NewAttr = S.mergeFormatAttr(D, Attr.getRange(), II,
Idx, FirstArg,
Attr.getAttributeSpellingListIndex());
if (NewAttr)
D->addAttr(NewAttr);
}
static void handleTransparentUnionAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
// Try to find the underlying union declaration.
RecordDecl *RD = 0;
TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
if (TD && TD->getUnderlyingType()->isUnionType())
RD = TD->getUnderlyingType()->getAsUnionType()->getDecl();
else
RD = dyn_cast<RecordDecl>(D);
if (!RD || !RD->isUnion()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedUnion;
return;
}
if (!RD->isCompleteDefinition()) {