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Reland "[Attr] Fix parameter indexing for several attributes" 

Relands r326602 (reverted in r326862) with new test and fix for
PR36620.

Differential Revision: https://reviews.llvm.org/D43248

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@327405 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Joel E. Denny 2018-03-13 14:51:22 +00:00
parent 39d91bde1e
commit f4ca1ac809
17 changed files with 418 additions and 153 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

122
include/clang/AST/Attr.h
View File

@ -195,6 +195,128 @@ public:
}
};
/// A single parameter index whose accessors require each use to make explicit
/// the parameter index encoding needed.
class ParamIdx {
// Idx is exposed only via accessors that specify specific encodings.
unsigned Idx : 30;
unsigned HasThis : 1;
unsigned IsValid : 1;
void assertComparable(const ParamIdx &I) const {
assert(isValid() && I.isValid() &&
"ParamIdx must be valid to be compared");
// It's possible to compare indices from separate functions, but so far
// it's not proven useful. Moreover, it might be confusing because a
// comparison on the results of getASTIndex might be inconsistent with a
// comparison on the ParamIdx objects themselves.
assert(HasThis == I.HasThis &&
"ParamIdx must be for the same function to be compared");
}
public:
/// Construct an invalid parameter index (\c isValid returns false and
/// accessors fail an assert).
ParamIdx() : Idx(0), HasThis(false), IsValid(false) {}
/// \param Idx is the parameter index as it is normally specified in
/// attributes in the source: one-origin including any C++ implicit this
/// parameter.
///
/// \param D is the declaration containing the parameters. It is used to
/// determine if there is a C++ implicit this parameter.
ParamIdx(unsigned Idx, const Decl *D)
: Idx(Idx), HasThis(false), IsValid(true) {
assert(Idx >= 1 && "Idx must be one-origin");
if (const auto *FD = dyn_cast<FunctionDecl>(D))
HasThis = FD->isCXXInstanceMember();
}
/// A type into which \c ParamIdx can be serialized.
///
/// A static assertion that it's of the correct size follows the \c ParamIdx
/// class definition.
typedef uint32_t SerialType;
/// Produce a representation that can later be passed to \c deserialize to
/// construct an equivalent \c ParamIdx.
SerialType serialize() const {
return *reinterpret_cast<const SerialType *>(this);
}
/// Construct from a result from \c serialize.
static ParamIdx deserialize(SerialType S) {
ParamIdx P(*reinterpret_cast<ParamIdx *>(&S));
assert((!P.IsValid || P.Idx >= 1) && "valid Idx must be one-origin");
return P;
}
/// Is this parameter index valid?
bool isValid() const { return IsValid; }
/// Get the parameter index as it would normally be encoded for attributes at
/// the source level of representation: one-origin including any C++ implicit
/// this parameter.
///
/// This encoding thus makes sense for diagnostics, pretty printing, and
/// constructing new attributes from a source-like specification.
unsigned getSourceIndex() const {
assert(isValid() && "ParamIdx must be valid");
return Idx;
}
/// Get the parameter index as it would normally be encoded at the AST level
/// of representation: zero-origin not including any C++ implicit this
/// parameter.
///
/// This is the encoding primarily used in Sema. However, in diagnostics,
/// Sema uses \c getSourceIndex instead.
unsigned getASTIndex() const {
assert(isValid() && "ParamIdx must be valid");
assert(Idx >= 1 + HasThis &&
"stored index must be base-1 and not specify C++ implicit this");
return Idx - 1 - HasThis;
}
/// Get the parameter index as it would normally be encoded at the LLVM level
/// of representation: zero-origin including any C++ implicit this parameter.
///
/// This is the encoding primarily used in CodeGen.
unsigned getLLVMIndex() const {
assert(isValid() && "ParamIdx must be valid");
assert(Idx >= 1 && "stored index must be base-1");
return Idx - 1;
}
bool operator==(const ParamIdx &I) const {
assertComparable(I);
return Idx == I.Idx;
}
bool operator!=(const ParamIdx &I) const {
assertComparable(I);
return Idx != I.Idx;
}
bool operator<(const ParamIdx &I) const {
assertComparable(I);
return Idx < I.Idx;
}
bool operator>(const ParamIdx &I) const {
assertComparable(I);
return Idx > I.Idx;
}
bool operator<=(const ParamIdx &I) const {
assertComparable(I);
return Idx <= I.Idx;
}
bool operator>=(const ParamIdx &I) const {
assertComparable(I);
return Idx >= I.Idx;
}
};
static_assert(sizeof(ParamIdx) == sizeof(ParamIdx::SerialType),
"ParamIdx does not fit its serialization type");
#include "clang/AST/Attrs.inc"
inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,

44
include/clang/Basic/Attr.td
View File

@ -169,6 +169,12 @@ class VariadicUnsignedArgument<string name> : Argument<name, 1>;
class VariadicExprArgument<string name> : Argument<name, 1>;
class VariadicStringArgument<string name> : Argument<name, 1>;
// Like VariadicUnsignedArgument except values are ParamIdx.
class VariadicParamIdxArgument<string name> : Argument<name, 1>;
// Like VariadicParamIdxArgument but for a single function parameter index.
class ParamIdxArgument<string name, bit opt = 0> : Argument<name, opt>;
// A version of the form major.minor[.subminor].
class VersionArgument<string name, bit opt = 0> : Argument<name, opt>;
@ -614,6 +620,12 @@ def XRayInstrument : InheritableAttr {
def XRayLogArgs : InheritableAttr {
let Spellings = [Clang<"xray_log_args">];
let Subjects = SubjectList<[Function, ObjCMethod]>;
// This argument is a count not an index, so it has the same encoding (base
// 1 including C++ implicit this parameter) at the source and LLVM levels of
// representation, so ParamIdxArgument is inappropriate. It is never used
// at the AST level of representation, so it never needs to be adjusted not
// to include any C++ implicit this parameter. Thus, we just store it and
// use it as an unsigned that never needs adjustment.
let Args = [UnsignedArgument<"ArgumentCount">];
let Documentation = [XRayDocs];
}
@ -1021,7 +1033,8 @@ def EmptyBases : InheritableAttr, TargetSpecificAttr<TargetMicrosoftCXXABI> {
def AllocSize : InheritableAttr {
let Spellings = [GCC<"alloc_size">];
let Subjects = SubjectList<[Function]>;
let Args = [IntArgument<"ElemSizeParam">, IntArgument<"NumElemsParam", 1>];
let Args = [ParamIdxArgument<"ElemSizeParam">,
ParamIdxArgument<"NumElemsParam", /*opt*/ 1>];
let TemplateDependent = 1;
let Documentation = [AllocSizeDocs];
}
@ -1108,7 +1121,7 @@ def Format : InheritableAttr {
def FormatArg : InheritableAttr {
let Spellings = [GCC<"format_arg">];
let Args = [IntArgument<"FormatIdx">];
let Args = [ParamIdxArgument<"FormatIdx">];
let Subjects = SubjectList<[ObjCMethod, HasFunctionProto]>;
let Documentation = [Undocumented];
}
@ -1388,16 +1401,16 @@ def NonNull : InheritableParamAttr {
let Spellings = [GCC<"nonnull">];
let Subjects = SubjectList<[ObjCMethod, HasFunctionProto, ParmVar], WarnDiag,
"functions, methods, and parameters">;
let Args = [VariadicUnsignedArgument<"Args">];
let AdditionalMembers =
[{bool isNonNull(unsigned idx) const {
if (!args_size())
return true;
for (const auto &V : args())
if (V == idx)
let Args = [VariadicParamIdxArgument<"Args">];
let AdditionalMembers = [{
bool isNonNull(unsigned IdxAST) const {
if (!args_size())
return true;
return false;
} }];
return args_end() != std::find_if(
args_begin(), args_end(),
[=](const ParamIdx &Idx) { return Idx.getASTIndex() == IdxAST; });
}
}];
// FIXME: We should merge duplicates into a single nonnull attribute.
let InheritEvenIfAlreadyPresent = 1;
let Documentation = [NonNullDocs];
@ -1455,7 +1468,7 @@ def AssumeAligned : InheritableAttr {
def AllocAlign : InheritableAttr {
let Spellings = [GCC<"alloc_align">];
let Subjects = SubjectList<[HasFunctionProto]>;
let Args = [IntArgument<"ParamIndex">];
let Args = [ParamIdxArgument<"ParamIndex">];
let Documentation = [AllocAlignDocs];
}
@ -1664,7 +1677,8 @@ def Ownership : InheritableAttr {
Returns;
}
}];
let Args = [IdentifierArgument<"Module">, VariadicUnsignedArgument<"Args">];
let Args = [IdentifierArgument<"Module">,
VariadicParamIdxArgument<"Args">];
let Subjects = SubjectList<[HasFunctionProto]>;
let Documentation = [Undocumented];
}
@ -2490,8 +2504,8 @@ def ArgumentWithTypeTag : InheritableAttr {
Clang<"pointer_with_type_tag">];
let Subjects = SubjectList<[HasFunctionProto], ErrorDiag>;
let Args = [IdentifierArgument<"ArgumentKind">,
UnsignedArgument<"ArgumentIdx">,
UnsignedArgument<"TypeTagIdx">,
ParamIdxArgument<"ArgumentIdx">,
ParamIdxArgument<"TypeTagIdx">,
BoolArgument<"IsPointer", /*opt*/0, /*fake*/1>];
let Documentation = [ArgumentWithTypeTagDocs, PointerWithTypeTagDocs];
}

10
lib/AST/ExprConstant.cpp
View File

@ -5475,9 +5475,8 @@ static bool getBytesReturnedByAllocSizeCall(const ASTContext &Ctx,
llvm::APInt &Result) {
const AllocSizeAttr *AllocSize = getAllocSizeAttr(Call);
// alloc_size args are 1-indexed, 0 means not present.
assert(AllocSize && AllocSize->getElemSizeParam() != 0);
unsigned SizeArgNo = AllocSize->getElemSizeParam() - 1;
assert(AllocSize && AllocSize->getElemSizeParam().isValid());
unsigned SizeArgNo = AllocSize->getElemSizeParam().getASTIndex();
unsigned BitsInSizeT = Ctx.getTypeSize(Ctx.getSizeType());
if (Call->getNumArgs() <= SizeArgNo)
return false;
@ -5495,14 +5494,13 @@ static bool getBytesReturnedByAllocSizeCall(const ASTContext &Ctx,
if (!EvaluateAsSizeT(Call->getArg(SizeArgNo), SizeOfElem))
return false;
if (!AllocSize->getNumElemsParam()) {
if (!AllocSize->getNumElemsParam().isValid()) {
Result = std::move(SizeOfElem);
return true;
}
APSInt NumberOfElems;
// Argument numbers start at 1
unsigned NumArgNo = AllocSize->getNumElemsParam() - 1;
unsigned NumArgNo = AllocSize->getNumElemsParam().getASTIndex();
if (!EvaluateAsSizeT(Call->getArg(NumArgNo), NumberOfElems))
return false;

9
lib/CodeGen/CGCall.cpp
View File

@ -1847,10 +1847,9 @@ void CodeGenModule::ConstructAttributeList(
HasOptnone = TargetDecl->hasAttr<OptimizeNoneAttr>();
if (auto *AllocSize = TargetDecl->getAttr<AllocSizeAttr>()) {
Optional<unsigned> NumElemsParam;
// alloc_size args are base-1, 0 means not present.
if (unsigned N = AllocSize->getNumElemsParam())
NumElemsParam = N - 1;
FuncAttrs.addAllocSizeAttr(AllocSize->getElemSizeParam() - 1,
if (AllocSize->getNumElemsParam().isValid())
NumElemsParam = AllocSize->getNumElemsParam().getLLVMIndex();
FuncAttrs.addAllocSizeAttr(AllocSize->getElemSizeParam().getLLVMIndex(),
NumElemsParam);
}
}
@ -4399,7 +4398,7 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
OffsetValue);
} else if (const auto *AA = TargetDecl->getAttr<AllocAlignAttr>()) {
llvm::Value *ParamVal =
CallArgs[AA->getParamIndex() - 1].RV.getScalarVal();
CallArgs[AA->getParamIndex().getLLVMIndex()].RV.getScalarVal();
EmitAlignmentAssumption(Ret.getScalarVal(), ParamVal);
}
}

37
lib/Sema/SemaChecking.cpp
View File

@ -2619,12 +2619,13 @@ static void CheckNonNullArguments(Sema &S,
return;
}
for (unsigned Val : NonNull->args()) {
if (Val >= Args.size())
for (const ParamIdx &Idx : NonNull->args()) {
unsigned IdxAST = Idx.getASTIndex();
if (IdxAST >= Args.size())
continue;
if (NonNullArgs.empty())
NonNullArgs.resize(Args.size());
NonNullArgs.set(Val);
NonNullArgs.set(IdxAST);
}
}
}
@ -5002,12 +5003,7 @@ checkFormatStringExpr(Sema &S, const Expr *E, ArrayRef<const Expr *> Args,
const CallExpr *CE = cast<CallExpr>(E);
if (const NamedDecl *ND = dyn_cast_or_null<NamedDecl>(CE->getCalleeDecl())) {
if (const FormatArgAttr *FA = ND->getAttr<FormatArgAttr>()) {
unsigned ArgIndex = FA->getFormatIdx();
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
if (MD->isInstance())
--ArgIndex;
const Expr *Arg = CE->getArg(ArgIndex - 1);
const Expr *Arg = CE->getArg(FA->getFormatIdx().getASTIndex());
return checkFormatStringExpr(S, Arg, Args,
HasVAListArg, format_idx, firstDataArg,
Type, CallType, InFunctionCall,
@ -5032,8 +5028,7 @@ checkFormatStringExpr(Sema &S, const Expr *E, ArrayRef<const Expr *> Args,
const auto *ME = cast<ObjCMessageExpr>(E);
if (const auto *ND = ME->getMethodDecl()) {
if (const auto *FA = ND->getAttr<FormatArgAttr>()) {
unsigned ArgIndex = FA->getFormatIdx();
const Expr *Arg = ME->getArg(ArgIndex - 1);
const Expr *Arg = ME->getArg(FA->getFormatIdx().getASTIndex());
return checkFormatStringExpr(
S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset);
@ -10086,8 +10081,8 @@ void Sema::DiagnoseAlwaysNonNullPointer(Expr *E,
return;
}
for (unsigned ArgNo : NonNull->args()) {
if (ArgNo == ParamNo) {
for (const ParamIdx &ArgNo : NonNull->args()) {
if (ArgNo.getASTIndex() == ParamNo) {
ComplainAboutNonnullParamOrCall(NonNull);
return;
}
@ -12242,13 +12237,13 @@ void Sema::CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
bool IsPointerAttr = Attr->getIsPointer();
// Retrieve the argument representing the 'type_tag'.
if (Attr->getTypeTagIdx() >= ExprArgs.size()) {
// Add 1 to display the user's specified value.
unsigned TypeTagIdxAST = Attr->getTypeTagIdx().getASTIndex();
if (TypeTagIdxAST >= ExprArgs.size()) {
Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
<< 0 << Attr->getTypeTagIdx() + 1;
<< 0 << Attr->getTypeTagIdx().getSourceIndex();
return;
}
const Expr *TypeTagExpr = ExprArgs[Attr->getTypeTagIdx()];
const Expr *TypeTagExpr = ExprArgs[TypeTagIdxAST];
bool FoundWrongKind;
TypeTagData TypeInfo;
if (!GetMatchingCType(ArgumentKind, TypeTagExpr, Context,
@ -12262,13 +12257,13 @@ void Sema::CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
}
// Retrieve the argument representing the 'arg_idx'.
if (Attr->getArgumentIdx() >= ExprArgs.size()) {
// Add 1 to display the user's specified value.
unsigned ArgumentIdxAST = Attr->getArgumentIdx().getASTIndex();
if (ArgumentIdxAST >= ExprArgs.size()) {
Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
<< 1 << Attr->getArgumentIdx() + 1;
<< 1 << Attr->getArgumentIdx().getSourceIndex();
return;
}
const Expr *ArgumentExpr = ExprArgs[Attr->getArgumentIdx()];
const Expr *ArgumentExpr = ExprArgs[ArgumentIdxAST];
if (IsPointerAttr) {
// Skip implicit cast of pointer to `void *' (as a function argument).
if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgumentExpr))

2
lib/Sema/SemaDecl.cpp
View File

@ -13185,7 +13185,7 @@ void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
// We already have a __builtin___CFStringMakeConstantString,
// but builds that use -fno-constant-cfstrings don't go through that.
if (!FD->hasAttr<FormatArgAttr>())
FD->addAttr(FormatArgAttr::CreateImplicit(Context, 1,
FD->addAttr(FormatArgAttr::CreateImplicit(Context, ParamIdx(1, FD),
FD->getLocation()));
}
}

149
lib/Sema/SemaDeclAttr.cpp
View File

@ -312,7 +312,7 @@ static bool checkAttrMutualExclusion(Sema &S, Decl *D, SourceRange Range,
template <typename AttrInfo>
static bool checkFunctionOrMethodParameterIndex(
Sema &S, const Decl *D, const AttrInfo &AI, unsigned AttrArgNum,
const Expr *IdxExpr, uint64_t &Idx, bool AllowImplicitThis = false) {
const Expr *IdxExpr, ParamIdx &Idx, bool CanIndexImplicitThis = false) {
assert(isFunctionOrMethodOrBlock(D));
// In C++ the implicit 'this' function parameter also counts.
@ -332,23 +332,22 @@ static bool checkFunctionOrMethodParameterIndex(
return false;
}
Idx = IdxInt.getLimitedValue();
if (Idx < 1 || (!IV && Idx > NumParams)) {
unsigned IdxSource = IdxInt.getLimitedValue(UINT_MAX);
if (IdxSource < 1 || (!IV && IdxSource > NumParams)) {
S.Diag(getAttrLoc(AI), diag::err_attribute_argument_out_of_bounds)
<< getAttrName(AI) << AttrArgNum << IdxExpr->getSourceRange();
<< getAttrName(AI) << AttrArgNum << IdxExpr->getSourceRange();
return false;
}
Idx--; // Convert to zero-based.
if (HasImplicitThisParam && !AllowImplicitThis) {
if (Idx == 0) {
if (HasImplicitThisParam && !CanIndexImplicitThis) {
if (IdxSource == 1) {
S.Diag(getAttrLoc(AI),
diag::err_attribute_invalid_implicit_this_argument)
<< getAttrName(AI) << IdxExpr->getSourceRange();
<< getAttrName(AI) << IdxExpr->getSourceRange();
return false;
}
--Idx;
}
Idx = ParamIdx(IdxSource, D);
return true;
}
@ -773,18 +772,15 @@ static void handleAssertExclusiveLockAttr(Sema &S, Decl *D,
/// AttrArgNo is used to actually retrieve the argument, so it's base-0.
template <typename AttrInfo>
static bool checkParamIsIntegerType(Sema &S, const FunctionDecl *FD,
const AttrInfo &AI, unsigned AttrArgNo,
bool AllowDependentType = false) {
const AttrInfo &AI, unsigned AttrArgNo) {
assert(AI.isArgExpr(AttrArgNo) && "Expected expression argument");
Expr *AttrArg = AI.getArgAsExpr(AttrArgNo);
uint64_t Idx;
ParamIdx Idx;
if (!checkFunctionOrMethodParameterIndex(S, FD, AI, AttrArgNo + 1, AttrArg,
Idx))
return false;
const ParmVarDecl *Param = FD->getParamDecl(Idx);
if (AllowDependentType && Param->getType()->isDependentType())
return true;
const ParmVarDecl *Param = FD->getParamDecl(Idx.getASTIndex());
if (!Param->getType()->isIntegerType() && !Param->getType()->isCharType()) {
SourceLocation SrcLoc = AttrArg->getLocStart();
S.Diag(SrcLoc, diag::err_attribute_integers_only)
@ -807,25 +803,24 @@ static void handleAllocSizeAttr(Sema &S, Decl *D, const AttributeList &AL) {
}
const Expr *SizeExpr = AL.getArgAsExpr(0);
int SizeArgNo;
int SizeArgNoVal;
// Parameter indices are 1-indexed, hence Index=1
if (!checkPositiveIntArgument(S, AL, SizeExpr, SizeArgNo, /*Index=*/1))
if (!checkPositiveIntArgument(S, AL, SizeExpr, SizeArgNoVal, /*Index=*/1))
return;
if (!checkParamIsIntegerType(S, FD, AL, /*AttrArgNo=*/0))
return;
ParamIdx SizeArgNo(SizeArgNoVal, D);
// Args are 1-indexed, so 0 implies that the arg was not present
int NumberArgNo = 0;
ParamIdx NumberArgNo;
if (AL.getNumArgs() == 2) {
const Expr *NumberExpr = AL.getArgAsExpr(1);
int Val;
// Parameter indices are 1-based, hence Index=2
if (!checkPositiveIntArgument(S, AL, NumberExpr, NumberArgNo,
/*Index=*/2))
if (!checkPositiveIntArgument(S, AL, NumberExpr, Val, /*Index=*/2))
return;
if (!checkParamIsIntegerType(S, FD, AL, /*AttrArgNo=*/1))
return;
NumberArgNo = ParamIdx(Val, D);
}
D->addAttr(::new (S.Context)
@ -1425,18 +1420,19 @@ static bool attrNonNullArgCheck(Sema &S, QualType T, const AttributeList &AL,
}
static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &AL) {
SmallVector<unsigned, 8> NonNullArgs;
SmallVector<ParamIdx, 8> NonNullArgs;
for (unsigned I = 0; I < AL.getNumArgs(); ++I) {
Expr *Ex = AL.getArgAsExpr(I);
uint64_t Idx;
ParamIdx Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, I + 1, Ex, Idx))
return;
// Is the function argument a pointer type?
if (Idx < getFunctionOrMethodNumParams(D) &&
!attrNonNullArgCheck(S, getFunctionOrMethodParamType(D, Idx), AL,
Ex->getSourceRange(),
getFunctionOrMethodParamRange(D, Idx)))
if (Idx.getASTIndex() < getFunctionOrMethodNumParams(D) &&
!attrNonNullArgCheck(
S, getFunctionOrMethodParamType(D, Idx.getASTIndex()), AL,
Ex->getSourceRange(),
getFunctionOrMethodParamRange(D, Idx.getASTIndex())))
continue;
NonNullArgs.push_back(Idx);
@ -1460,12 +1456,12 @@ static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &AL) {
S.Diag(AL.getLoc(), diag::warn_attribute_nonnull_no_pointers);
}
unsigned *Start = NonNullArgs.data();
ParamIdx *Start = NonNullArgs.data();
unsigned Size = NonNullArgs.size();
llvm::array_pod_sort(Start, Start + Size);
D->addAttr(::new (S.Context)
NonNullAttr(AL.getRange(), S.Context, Start, Size,
AL.getAttributeSpellingListIndex()));
NonNullAttr(AL.getRange(), S.Context, Start, Size,
AL.getAttributeSpellingListIndex()));
}
static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
@ -1486,8 +1482,8 @@ static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
return;
D->addAttr(::new (S.Context)
NonNullAttr(AL.getRange(), S.Context, nullptr, 0,
AL.getAttributeSpellingListIndex()));
NonNullAttr(AL.getRange(), S.Context, nullptr, 0,
AL.getAttributeSpellingListIndex()));
}
static void handleReturnsNonNullAttr(Sema &S, Decl *D,
@ -1588,7 +1584,7 @@ void Sema::AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
unsigned SpellingListIndex) {
QualType ResultType = getFunctionOrMethodResultType(D);
AllocAlignAttr TmpAttr(AttrRange, Context, 0, SpellingListIndex);
AllocAlignAttr TmpAttr(AttrRange, Context, ParamIdx(), SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();
if (!ResultType->isDependentType() &&
@ -1598,28 +1594,22 @@ void Sema::AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
return;
}
uint64_t IndexVal;
ParamIdx Idx;
const auto *FuncDecl = cast<FunctionDecl>(D);
if (!checkFunctionOrMethodParameterIndex(*this, FuncDecl, TmpAttr,
/*AttrArgNo=*/1, ParamExpr,
IndexVal))
/*AttrArgNo=*/1, ParamExpr, Idx))
return;
QualType Ty = getFunctionOrMethodParamType(D, IndexVal);
QualType Ty = getFunctionOrMethodParamType(D, Idx.getASTIndex());
if (!Ty->isDependentType() && !Ty->isIntegralType(Context)) {
Diag(ParamExpr->getLocStart(), diag::err_attribute_integers_only)
<< &TmpAttr << FuncDecl->getParamDecl(IndexVal)->getSourceRange();
<< &TmpAttr
<< FuncDecl->getParamDecl(Idx.getASTIndex())->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;
ParamExpr->EvaluateAsInt(Val, Context);
D->addAttr(::new (Context) AllocAlignAttr(
AttrRange, Context, Val.getZExtValue(), SpellingListIndex));
D->addAttr(::new (Context)
AllocAlignAttr(AttrRange, Context, Idx, SpellingListIndex));
}
/// Normalize the attribute, __foo__ becomes foo.
@ -1679,15 +1669,15 @@ static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
Module = &S.PP.getIdentifierTable().get(ModuleName);
}
SmallVector<unsigned, 8> OwnershipArgs;
SmallVector<ParamIdx, 8> OwnershipArgs;
for (unsigned i = 1; i < AL.getNumArgs(); ++i) {
Expr *Ex = AL.getArgAsExpr(i);
uint64_t Idx;
ParamIdx Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, i, Ex, Idx))
return;
// Is the function argument a pointer type?
QualType T = getFunctionOrMethodParamType(D, Idx);
QualType T = getFunctionOrMethodParamType(D, Idx.getASTIndex());
int Err = -1; // No error
switch (K) {
case OwnershipAttr::Takes:
@ -1718,14 +1708,13 @@ static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
} else if (K == OwnershipAttr::Returns &&
I->getOwnKind() == OwnershipAttr::Returns) {
// A returns attribute conflicts with any other returns attribute using
// a different index. Note, diagnostic reporting is 1-based, but stored
// argument indexes are 0-based.
// a different index.
if (std::find(I->args_begin(), I->args_end(), Idx) == I->args_end()) {
S.Diag(I->getLocation(), diag::err_ownership_returns_index_mismatch)
<< *(I->args_begin()) + 1;
<< I->args_begin()->getSourceIndex();
if (I->args_size())
S.Diag(AL.getLoc(), diag::note_ownership_returns_index_mismatch)
<< (unsigned)Idx + 1 << Ex->getSourceRange();
<< Idx.getSourceIndex() << Ex->getSourceRange();
return;
}
}
@ -1733,13 +1722,12 @@ static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
OwnershipArgs.push_back(Idx);
}
unsigned* start = OwnershipArgs.data();
unsigned size = OwnershipArgs.size();
llvm::array_pod_sort(start, start + size);
ParamIdx *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()));
OwnershipAttr(AL.getLoc(), S.Context, Module, Start, Size,
AL.getAttributeSpellingListIndex()));
}
static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &AL) {
@ -3057,12 +3045,12 @@ static void handleEnumExtensibilityAttr(Sema &S, Decl *D,
/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &AL) {
Expr *IdxExpr = AL.getArgAsExpr(0);
uint64_t Idx;
ParamIdx Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, 1, IdxExpr, Idx))
return;
// Make sure the format string is really a string.
QualType Ty = getFunctionOrMethodParamType(D, Idx);
QualType Ty = getFunctionOrMethodParamType(D, Idx.getASTIndex());
bool NotNSStringTy = !isNSStringType(Ty, S.Context);
if (NotNSStringTy &&
@ -3085,15 +3073,8 @@ static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &AL) {
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(AL.getRange(), S.Context, Val.getZExtValue(),
AL.getAttributeSpellingListIndex()));
D->addAttr(::new (S.Context) FormatArgAttr(
AL.getRange(), S.Context, Idx, AL.getAttributeSpellingListIndex()));
}
enum FormatAttrKind {
@ -4488,12 +4469,12 @@ static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
return;
}
uint64_t ArgumentIdx;
ParamIdx ArgumentIdx;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, 2, AL.getArgAsExpr(1),
ArgumentIdx))
return;
uint64_t TypeTagIdx;
ParamIdx TypeTagIdx;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, 3, AL.getArgAsExpr(2),
TypeTagIdx))
return;
@ -4501,8 +4482,9 @@ static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
bool IsPointer = AL.getName()->getName() == "pointer_with_type_tag";
if (IsPointer) {
// Ensure that buffer has a pointer type.
if (ArgumentIdx >= getFunctionOrMethodNumParams(D) ||
!getFunctionOrMethodParamType(D, ArgumentIdx)->isPointerType())
unsigned ArgumentIdxAST = ArgumentIdx.getASTIndex();
if (ArgumentIdxAST >= getFunctionOrMethodNumParams(D) ||
!getFunctionOrMethodParamType(D, ArgumentIdxAST)->isPointerType())
S.Diag(AL.getLoc(), diag::err_attribute_pointers_only)
<< AL.getName() << 0;
}
@ -4542,19 +4524,18 @@ static void handleTypeTagForDatatypeAttr(Sema &S, Decl *D,
AL.getAttributeSpellingListIndex()));
}
static void handleXRayLogArgsAttr(Sema &S, Decl *D,
const AttributeList &AL) {
uint64_t ArgCount;
static void handleXRayLogArgsAttr(Sema &S, Decl *D, const AttributeList &AL) {
ParamIdx ArgCount;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, 1, AL.getArgAsExpr(0),
ArgCount,
true /* AllowImplicitThis*/))
true /* CanIndexImplicitThis */))
return;
// ArgCount isn't a parameter index [0;n), it's a count [1;n] - hence + 1.
D->addAttr(::new (S.Context)
XRayLogArgsAttr(AL.getRange(), S.Context, ++ArgCount,
AL.getAttributeSpellingListIndex()));
// ArgCount isn't a parameter index [0;n), it's a count [1;n]
D->addAttr(::new (S.Context) XRayLogArgsAttr(
AL.getRange(), S.Context, ArgCount.getSourceIndex(),
AL.getAttributeSpellingListIndex()));
}
//===----------------------------------------------------------------------===//

3
lib/Sema/SemaTemplateInstantiateDecl.cpp
View File

@ -176,7 +176,8 @@ static void instantiateDependentAllocAlignAttr(
Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
const AllocAlignAttr *Align, Decl *New) {
Expr *Param = IntegerLiteral::Create(
S.getASTContext(), llvm::APInt(64, Align->getParamIndex()),
S.getASTContext(),
llvm::APInt(64, Align->getParamIndex().getSourceIndex()),
S.getASTContext().UnsignedLongLongTy, Align->getLocation());
S.AddAllocAlignAttr(Align->getLocation(), New, Param,
Align->getSpellingListIndex());

11
lib/StaticAnalyzer/Checkers/MallocChecker.cpp
View File

@ -1231,9 +1231,10 @@ MallocChecker::MallocMemReturnsAttr(CheckerContext &C, const CallExpr *CE,
if (Att->getModule() != II_malloc)
return nullptr;
OwnershipAttr::args_iterator I = Att->args_begin(), E = Att->args_end();
ParamIdx *I = Att->args_begin(), *E = Att->args_end();
if (I != E) {
return MallocMemAux(C, CE, CE->getArg(*I), UndefinedVal(), State);
return MallocMemAux(C, CE, CE->getArg(I->getASTIndex()), UndefinedVal(),
State);
}
return MallocMemAux(C, CE, UnknownVal(), UndefinedVal(), State);
}
@ -1331,9 +1332,9 @@ ProgramStateRef MallocChecker::FreeMemAttr(CheckerContext &C,
bool ReleasedAllocated = false;
for (const auto &Arg : Att->args()) {
ProgramStateRef StateI = FreeMemAux(C, CE, State, Arg,
Att->getOwnKind() == OwnershipAttr::Holds,
ReleasedAllocated);
ProgramStateRef StateI = FreeMemAux(
C, CE, State, Arg.getASTIndex(),
Att->getOwnKind() == OwnershipAttr::Holds, ReleasedAllocated);
if (StateI)
State = StateI;
}

7
lib/StaticAnalyzer/Checkers/NonNullParamChecker.cpp
View File

@ -54,10 +54,11 @@ static llvm::SmallBitVector getNonNullAttrs(const CallEvent &Call) {
AttrNonNull.set(0, NumArgs);
break;
}
for (unsigned Val : NonNull->args()) {
if (Val >= NumArgs)
for (const ParamIdx &Idx : NonNull->args()) {
unsigned IdxAST = Idx.getASTIndex();
if (IdxAST >= NumArgs)
continue;
AttrNonNull.set(Val);
AttrNonNull.set(IdxAST);
}
}
return AttrNonNull;

18
test/CodeGenCXX/alloc-size.cpp
View File

@ -86,3 +86,21 @@ int testIt() {
return __builtin_object_size(p, 0);
}
} // namespace alloc_size_with_cleanups
class C {
public:
void *my_malloc(int N) __attribute__((alloc_size(2)));
void *my_calloc(int N, int M) __attribute__((alloc_size(2, 3)));
};
// CHECK-LABEL: define i32 @_Z16callMemberMallocv
int callMemberMalloc() {
// CHECK: ret i32 16
return __builtin_object_size(C().my_malloc(16), 0);
}
// CHECK-LABEL: define i32 @_Z16callMemberCallocv
int callMemberCalloc() {
// CHECK: ret i32 32
return __builtin_object_size(C().my_calloc(16, 2), 0);
}

5
test/Frontend/ast-attr.cpp Normal file
View File

@ -0,0 +1,5 @@
// RUN: %clang -emit-ast -o %t.ast %S/../Sema/attr-print.cpp
// RUN: %clang_cc1 %t.ast -ast-print | FileCheck %S/../Sema/attr-print.cpp
// %S/../Sema/attr-print.cpp exercises many different attributes, so we reuse
// it here to check -emit-ast for attributes.

4
test/Misc/ast-dump-attr.cpp
View File

@ -68,12 +68,12 @@ __attribute__((pointer_with_type_tag(ident1,1,2)));
void TestBool(void *, int)
__attribute__((pointer_with_type_tag(bool1,1,2)));
// CHECK: FunctionDecl{{.*}}TestBool
// CHECK: ArgumentWithTypeTagAttr{{.*}}pointer_with_type_tag bool1 0 1 IsPointer
// CHECK: ArgumentWithTypeTagAttr{{.*}}pointer_with_type_tag bool1 1 2 IsPointer
void TestUnsigned(void *, int)
__attribute__((pointer_with_type_tag(unsigned1,1,2)));
// CHECK: FunctionDecl{{.*}}TestUnsigned
// CHECK: ArgumentWithTypeTagAttr{{.*}} pointer_with_type_tag unsigned1 0 1
// CHECK: ArgumentWithTypeTagAttr{{.*}} pointer_with_type_tag unsigned1 1 2
void TestInt(void) __attribute__((constructor(123)));
// CHECK: FunctionDecl{{.*}}TestInt

7
test/Sema/attr-ownership.cpp Normal file
View File

@ -0,0 +1,7 @@
// RUN: %clang_cc1 %s -verify -fsyntax-only
class C {
void f(int, int)
__attribute__((ownership_returns(foo, 2))) // expected-note {{declared with index 2 here}}
__attribute__((ownership_returns(foo, 3))); // expected-error {{'ownership_returns' attribute index does not match; here it is 3}}
};

63
test/Sema/attr-print.cpp
View File

@ -1,6 +1,69 @@
// RUN: %clang_cc1 %s -ast-print | FileCheck %s
// This file is also used as input for %S/../Frontend/ast-attr.cpp.
// CHECK: void xla(int a) __attribute__((xray_log_args(1)));
void xla(int a) __attribute__((xray_log_args(1)));
// CHECK: void *as2(int, int) __attribute__((alloc_size(1, 2)));
void *as2(int, int) __attribute__((alloc_size(1, 2)));
// CHECK: void *as1(void *, int) __attribute__((alloc_size(2)));
void *as1(void *, int) __attribute__((alloc_size(2)));
// CHECK: void fmt(int, const char *, ...) __attribute__((format(printf, 2, 3)));
void fmt(int, const char *, ...) __attribute__((format(printf, 2, 3)));
// CHECK: char *fmta(int, const char *) __attribute__((format_arg(2)));
char *fmta(int, const char *) __attribute__((format_arg(2)));
// CHECK: void nn(int *, int *) __attribute__((nonnull(1, 2)));
void nn(int *, int *) __attribute__((nonnull(1, 2)));
// CHECK: int *aa(int i) __attribute__((alloc_align(1)));
int *aa(int i) __attribute__((alloc_align(1)));
// CHECK: void ownt(int *, int *) __attribute__((ownership_takes(foo, 1, 2)));
void ownt(int *, int *) __attribute__((ownership_takes(foo, 1, 2)));
// CHECK: void ownh(int *, int *) __attribute__((ownership_holds(foo, 1, 2)));
void ownh(int *, int *) __attribute__((ownership_holds(foo, 1, 2)));
// CHECK: void ownr(int) __attribute__((ownership_returns(foo, 1)));
void ownr(int) __attribute__((ownership_returns(foo, 1)));
// CHECK: void awtt(int, int, ...) __attribute__((argument_with_type_tag(foo, 3, 2)));
void awtt(int, int, ...) __attribute__((argument_with_type_tag(foo, 3, 2)));
// CHECK: void pwtt(void *, int) __attribute__((pointer_with_type_tag(foo, 1, 2)));
void pwtt(void *, int) __attribute__((pointer_with_type_tag(foo, 1, 2)));
class C {
// CHECK: void xla(int a) __attribute__((xray_log_args(2)));
void xla(int a) __attribute__((xray_log_args(2)));
// CHECK: void *as2(int, int) __attribute__((alloc_size(2, 3)));
void *as2(int, int) __attribute__((alloc_size(2, 3)));
// CHECK: void *as1(void *, int) __attribute__((alloc_size(3)));
void *as1(void *, int) __attribute__((alloc_size(3)));
// CHECK: void fmt(int, const char *, ...) __attribute__((format(printf, 3, 4)));
void fmt(int, const char *, ...) __attribute__((format(printf, 3, 4)));
// CHECK: char *fmta(int, const char *) __attribute__((format_arg(3)));
char *fmta(int, const char *) __attribute__((format_arg(3)));
// CHECK: void nn(int *, int *) __attribute__((nonnull(2, 3)));
void nn(int *, int *) __attribute__((nonnull(2, 3)));
// CHECK: int *aa(int i) __attribute__((alloc_align(2)));
int *aa(int i) __attribute__((alloc_align(2)));
// CHECK: void ownt(int *, int *) __attribute__((ownership_takes(foo, 2, 3)));
void ownt(int *, int *) __attribute__((ownership_takes(foo, 2, 3)));
// CHECK: void ownh(int *, int *) __attribute__((ownership_holds(foo, 2, 3)));
void ownh(int *, int *) __attribute__((ownership_holds(foo, 2, 3)));
// CHECK: void ownr(int) __attribute__((ownership_returns(foo, 2)));
void ownr(int) __attribute__((ownership_returns(foo, 2)));
// CHECK: void awtt(int, int, ...) __attribute__((argument_with_type_tag(foo, 4, 3)));
void awtt(int, int, ...) __attribute__((argument_with_type_tag(foo, 4, 3)));
// CHECK: void pwtt(void *, int) __attribute__((pointer_with_type_tag(foo, 2, 3)));
void pwtt(void *, int) __attribute__((pointer_with_type_tag(foo, 2, 3)));
};

39
test/Sema/error-type-safety.cpp
View File

@ -3,21 +3,50 @@
#define INT_TAG 42
static const int test_in
__attribute__((type_tag_for_datatype(test, int))) = INT_TAG;
__attribute__((type_tag_for_datatype(test, int))) = INT_TAG;
// Argument index: 1, Type tag index: 2
void test_bounds_index(...)
__attribute__((argument_with_type_tag(test, 1, 2)));
__attribute__((argument_with_type_tag(test, 1, 2)));
// Argument index: 1, Type tag index: 2
void test_bounds_index_ptr(void *, ...)
__attribute__((pointer_with_type_tag(test, 1, 2)));
// Argument index: 3, Type tag index: 1
void test_bounds_arg_index(...)
__attribute__((argument_with_type_tag(test, 3, 1)));
__attribute__((argument_with_type_tag(test, 3, 1)));
class C {
public:
// Argument index: 2, Type tag index: 3
void test_bounds_index(...)
__attribute__((argument_with_type_tag(test, 2, 3)));
// Argument index: 2, Type tag index: 3
void test_bounds_index_ptr(void *, ...)
__attribute__((pointer_with_type_tag(test, 2, 3)));
// Argument index: 4, Type tag index: 2
void test_bounds_arg_index(...)
__attribute__((argument_with_type_tag(test, 4, 2)));
};
void test_bounds()
{
C c;
// Test the boundary edges (ensure no off-by-one) with argument indexing.
test_bounds_index(1, INT_TAG);
c.test_bounds_index(1, INT_TAG);
test_bounds_index_ptr(0, INT_TAG);
c.test_bounds_index_ptr(0, INT_TAG);
test_bounds_index(1); // expected-error {{type tag index 2 is greater than the number of arguments specified}}
test_bounds_arg_index(INT_TAG, 1); // expected-error {{argument index 3 is greater than the number of arguments specified}}
test_bounds_index(1); // expected-error {{type tag index 2 is greater than the number of arguments specified}}
c.test_bounds_index(1); // expected-error {{type tag index 3 is greater than the number of arguments specified}}
test_bounds_index_ptr(0); // expected-error {{type tag index 2 is greater than the number of arguments specified}}
c.test_bounds_index_ptr(0); // expected-error {{type tag index 3 is greater than the number of arguments specified}}
test_bounds_arg_index(INT_TAG, 1); // expected-error {{argument index 3 is greater than the number of arguments specified}}
c.test_bounds_arg_index(INT_TAG, 1); // expected-error {{argument index 4 is greater than the number of arguments specified}}
}

39
utils/TableGen/ClangAttrEmitter.cpp
View File

@ -104,6 +104,7 @@ static std::string ReadPCHRecord(StringRef type) {
.Case("Expr *", "Record.readExpr()")
.Case("IdentifierInfo *", "Record.getIdentifierInfo()")
.Case("StringRef", "Record.readString()")
.Case("ParamIdx", "ParamIdx::deserialize(Record.readInt())")
.Default("Record.readInt()");
}
@ -122,6 +123,7 @@ static std::string WritePCHRecord(StringRef type, StringRef name) {
.Case("Expr *", "AddStmt(" + std::string(name) + ");\n")
.Case("IdentifierInfo *", "AddIdentifierRef(" + std::string(name) + ");\n")
.Case("StringRef", "AddString(" + std::string(name) + ");\n")
.Case("ParamIdx", "push_back(" + std::string(name) + ".serialize());\n")
.Default("push_back(" + std::string(name) + ");\n");
}
@ -302,9 +304,8 @@ namespace {
std::string getIsOmitted() const override {
if (type == "IdentifierInfo *")
return "!get" + getUpperName().str() + "()";
// FIXME: Do this declaratively in Attr.td.
if (getAttrName() == "AllocSize")
return "0 == get" + getUpperName().str() + "()";
if (type == "ParamIdx")
return "!get" + getUpperName().str() + "().isValid()";
return "false";
}
@ -319,6 +320,8 @@ namespace {
<< "()->getName() : \"\") << \"";
else if (type == "TypeSourceInfo *")
OS << "\" << get" << getUpperName() << "().getAsString() << \"";
else if (type == "ParamIdx")
OS << "\" << get" << getUpperName() << "().getSourceIndex() << \"";
else
OS << "\" << get" << getUpperName() << "() << \"";
}
@ -341,6 +344,11 @@ namespace {
<< getUpperName() << "\";\n";
} else if (type == "int" || type == "unsigned") {
OS << " OS << \" \" << SA->get" << getUpperName() << "();\n";
} else if (type == "ParamIdx") {
if (isOptional())
OS << " if (SA->get" << getUpperName() << "().isValid())\n ";
OS << " OS << \" \" << SA->get" << getUpperName()
<< "().getSourceIndex();\n";
} else {
llvm_unreachable("Unknown SimpleArgument type!");
}
@ -618,6 +626,10 @@ namespace {
virtual void writeValueImpl(raw_ostream &OS) const {
OS << " OS << Val;\n";
}
// Assumed to receive a parameter: raw_ostream OS.
virtual void writeDumpImpl(raw_ostream &OS) const {
OS << " OS << \" \" << Val;\n";
}
public:
VariadicArgument(const Record &Arg, StringRef Attr, std::string T)
@ -744,7 +756,22 @@ namespace {
void writeDump(raw_ostream &OS) const override {
OS << " for (const auto &Val : SA->" << RangeName << "())\n";
OS << " OS << \" \" << Val;\n";
writeDumpImpl(OS);
}
};
class VariadicParamIdxArgument : public VariadicArgument {
public:
VariadicParamIdxArgument(const Record &Arg, StringRef Attr)
: VariadicArgument(Arg, Attr, "ParamIdx") {}
public:
void writeValueImpl(raw_ostream &OS) const override {
OS << " OS << Val.getSourceIndex();\n";
}
void writeDumpImpl(raw_ostream &OS) const override {
OS << " OS << \" \" << Val.getSourceIndex();\n";
}
};
@ -1247,6 +1274,10 @@ createArgument(const Record &Arg, StringRef Attr,
Ptr = llvm::make_unique<VariadicEnumArgument>(Arg, Attr);
else if (ArgName == "VariadicExprArgument")
Ptr = llvm::make_unique<VariadicExprArgument>(Arg, Attr);
else if (ArgName == "VariadicParamIdxArgument")
Ptr = llvm::make_unique<VariadicParamIdxArgument>(Arg, Attr);
else if (ArgName == "ParamIdxArgument")
Ptr = llvm::make_unique<SimpleArgument>(Arg, Attr, "ParamIdx");
else if (ArgName == "VersionArgument")
Ptr = llvm::make_unique<VersionArgument>(Arg, Attr);