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llvm / clang / e8264bb9815647b4c6558aeb045c65965cdb26d3 / . / lib / Sema / SemaDeclAttr.cpp
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//===--- SemaDeclAttr.cpp - Declaration Attribute Handling ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements decl-related attribute processing.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTMutationListener.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/ExprCXX.h"
#include "clang/AST/Mangle.h"
#include "clang/AST/RecursiveASTVisitor.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/Initialization.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/SemaInternal.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/MathExtras.h"
using namespace clang;
using namespace sema;
namespace AttributeLangSupport {
enum LANG {
C,
Cpp,
ObjC
};
} // end namespace AttributeLangSupport
//===----------------------------------------------------------------------===//
// 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() != nullptr) || isa<ObjCMethodDecl>(D);
}
/// \brief Return true if the given decl has function type (function or
/// function-typed variable) or an Objective-C method or a block.
static bool isFunctionOrMethodOrBlock(const Decl *D) {
return isFunctionOrMethod(D) || isa<BlockDecl>(D);
}
/// Return true if the given decl has a declarator that should have
/// been processed by Sema::GetTypeForDeclarator.
static bool hasDeclarator(const Decl *D) {
// In some sense, TypedefDecl really *ought* to be a DeclaratorDecl.
return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) ||
isa<ObjCPropertyDecl>(D);
}
/// hasFunctionProto - Return true if the given decl has a argument
/// information. This decl should have already passed
/// isFunctionOrMethod or isFunctionOrMethodOrBlock.
static bool hasFunctionProto(const Decl *D) {
if (const FunctionType *FnTy = 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)->parameters()[Idx]->getType();
}
static SourceRange getFunctionOrMethodParamRange(const Decl *D, unsigned Idx) {
if (const auto *FD = dyn_cast<FunctionDecl>(D))
return FD->getParamDecl(Idx)->getSourceRange();
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
return MD->parameters()[Idx]->getSourceRange();
if (const auto *BD = dyn_cast<BlockDecl>(D))
return BD->getParamDecl(Idx)->getSourceRange();
return SourceRange();
}
static QualType getFunctionOrMethodResultType(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return cast<FunctionType>(FnTy)->getReturnType();
return cast<ObjCMethodDecl>(D)->getReturnType();
}
static SourceRange getFunctionOrMethodResultSourceRange(const Decl *D) {
if (const auto *FD = dyn_cast<FunctionDecl>(D))
return FD->getReturnTypeSourceRange();
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
return MD->getReturnTypeSourceRange();
return SourceRange();
}
static bool isFunctionOrMethodVariadic(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType()) {
const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy);
return proto->isVariadic();
}
if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
return BD->isVariadic();
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();
}
template <typename Compare>
static bool checkAttributeNumArgsImpl(Sema &S, const AttributeList &Attr,
unsigned Num, unsigned Diag,
Compare Comp) {
if (Comp(getNumAttributeArgs(Attr), Num)) {
S.Diag(Attr.getLoc(), Diag) << Attr.getName() << Num;
return false;
}
return true;
}
/// \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) {
return checkAttributeNumArgsImpl(S, Attr, Num,
diag::err_attribute_wrong_number_arguments,
std::not_equal_to<unsigned>());
}
/// \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) {
return checkAttributeNumArgsImpl(S, Attr, Num,
diag::err_attribute_too_few_arguments,
std::less<unsigned>());
}
/// \brief Check if the attribute has at most as many args as Num. May
/// output an error.
static bool checkAttributeAtMostNumArgs(Sema &S, const AttributeList &Attr,
unsigned Num) {
return checkAttributeNumArgsImpl(S, Attr, Num,
diag::err_attribute_too_many_arguments,
std::greater<unsigned>());
}
/// \brief A helper function to provide Attribute Location for the Attr types
/// AND the AttributeList.
template <typename AttrInfo>
static typename std::enable_if<std::is_base_of<clang::Attr, AttrInfo>::value,
SourceLocation>::type
getAttrLoc(const AttrInfo &Attr) {
return Attr.getLocation();
}
static SourceLocation getAttrLoc(const clang::AttributeList &Attr) {
return Attr.getLoc();
}
/// \brief A helper function to provide Attribute Name for the Attr types
/// AND the AttributeList.
template <typename AttrInfo>
static typename std::enable_if<std::is_base_of<clang::Attr, AttrInfo>::value,
const AttrInfo *>::type
getAttrName(const AttrInfo &Attr) {
return &Attr;
}
static const IdentifierInfo *getAttrName(const clang::AttributeList &Attr) {
return Attr.getName();
}
/// \brief If Expr is a valid integer constant, get the value of the integer
/// expression and return success or failure. May output an error.
template<typename AttrInfo>
static bool checkUInt32Argument(Sema &S, const AttrInfo& 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(getAttrLoc(Attr), diag::err_attribute_argument_n_type)
<< getAttrName(Attr) << Idx << AANT_ArgumentIntegerConstant
<< Expr->getSourceRange();
else
S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_type)
<< getAttrName(Attr) << AANT_ArgumentIntegerConstant
<< Expr->getSourceRange();
return false;
}
if (!I.isIntN(32)) {
S.Diag(Expr->getExprLoc(), diag::err_ice_too_large)
<< I.toString(10, false) << 32 << /* Unsigned */ 1;
return false;
}
Val = (uint32_t)I.getZExtValue();
return true;
}
/// \brief Wrapper around checkUInt32Argument, with an extra check to be sure
/// that the result will fit into a regular (signed) int. All args have the same
/// purpose as they do in checkUInt32Argument.
template<typename AttrInfo>
static bool checkPositiveIntArgument(Sema &S, const AttrInfo& Attr, const Expr *Expr,
int &Val, unsigned Idx = UINT_MAX) {
uint32_t UVal;
if (!checkUInt32Argument(S, Attr, Expr, UVal, Idx))
return false;
if (UVal > (uint32_t)std::numeric_limits<int>::max()) {
llvm::APSInt I(32); // for toString
I = UVal;
S.Diag(Expr->getExprLoc(), diag::err_ice_too_large)
<< I.toString(10, false) << 32 << /* Unsigned */ 0;
return false;
}
Val = UVal;
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, SourceRange Range,
IdentifierInfo *Ident) {
if (AttrTy *A = D->getAttr<AttrTy>()) {
S.Diag(Range.getBegin(), diag::err_attributes_are_not_compatible) << Ident
<< A;
S.Diag(A->getLocation(), diag::note_conflicting_attribute);
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.
template <typename AttrInfo>
static bool checkFunctionOrMethodParameterIndex(
Sema &S, const Decl *D, const AttrInfo &Attr, unsigned AttrArgNum,
const Expr *IdxExpr, uint64_t &Idx, bool AllowImplicitThis = false) {
assert(isFunctionOrMethodOrBlock(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(getAttrLoc(Attr), diag::err_attribute_argument_n_type)
<< getAttrName(Attr) << AttrArgNum << AANT_ArgumentIntegerConstant
<< IdxExpr->getSourceRange();
return false;
}
Idx = IdxInt.getLimitedValue();
if (Idx < 1 || (!IV && Idx > NumParams)) {
S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_out_of_bounds)
<< getAttrName(Attr) << AttrArgNum << IdxExpr->getSourceRange();
return false;
}
Idx--; // Convert to zero-based.
if (HasImplicitThisParam && !AllowImplicitThis) {
if (Idx == 0) {
S.Diag(getAttrLoc(Attr),
diag::err_attribute_invalid_implicit_this_argument)
<< getAttrName(Attr) << 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(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()));
}
template <typename AttrType>
static void handleSimpleAttributeWithExclusions(Sema &S, Decl *D,
const AttributeList &Attr) {
handleSimpleAttribute<AttrType>(S, D, Attr);
}
/// \brief Applies the given attribute to the Decl so long as the Decl doesn't
/// already have one of the given incompatible attributes.
template <typename AttrType, typename IncompatibleAttrType,
typename... IncompatibleAttrTypes>
static void handleSimpleAttributeWithExclusions(Sema &S, Decl *D,
const AttributeList &Attr) {
if (checkAttrMutualExclusion<IncompatibleAttrType>(S, D, Attr.getRange(),
Attr.getName()))
return;
handleSimpleAttributeWithExclusions<AttrType, IncompatibleAttrTypes...>(S, D,
Attr);
}
/// \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) {
DeclContextLookupResult Res1 = RT->getDecl()->lookup(
S.Context.DeclarationNames.getCXXOperatorName(OO_Star));
if (Res1.empty())
return false;
DeclContextLookupResult 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 nullptr;
}
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 &) {
const auto *Type = BS->getType()->getAs<RecordType>();
return Type->getDecl()->hasAttr<CapabilityAttr>();
}, 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<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 || E->getOpcode() == UO_AddrOf ||
E->getOpcode() == UO_Deref)
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 typeHasCapability(S, Ex->getType());
}
/// \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
//===----------------------------------------------------------------------===//
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 = nullptr;
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 = nullptr;
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() && !typeHasCapability(S, QT)) {
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 ? nullptr : &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 ? nullptr : &Args[0];
D->addAttr(::new (S.Context)
AssertExclusiveLockAttr(Attr.getRange(), S.Context,
StartArg, Size,
Attr.getAttributeSpellingListIndex()));
}
/// \brief Checks to be sure that the given parameter number is in bounds, and is
/// an integral type. Will emit appropriate diagnostics if this returns
/// false.
///
/// FuncParamNo is expected to be from the user, so is base-1. 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 &Attr, Expr *AttrArg,
unsigned FuncParamNo, unsigned AttrArgNo,
bool AllowDependentType = false) {
uint64_t Idx;
if (!checkFunctionOrMethodParameterIndex(S, FD, Attr, FuncParamNo, AttrArg,
Idx))
return false;
const ParmVarDecl *Param = FD->getParamDecl(Idx);
if (AllowDependentType && Param->getType()->isDependentType())
return true;
if (!Param->getType()->isIntegerType() && !Param->getType()->isCharType()) {
SourceLocation SrcLoc = AttrArg->getLocStart();
S.Diag(SrcLoc, diag::err_attribute_integers_only)
<< getAttrName(Attr) << Param->getSourceRange();
return false;
}
return true;
}
/// \brief Checks to be sure that the given parameter number is in bounds, and is
/// an integral type. Will emit appropriate diagnostics if this returns false.
///
/// FuncParamNo is expected to be from the user, so is base-1. AttrArgNo is used
/// to actually retrieve the argument, so it's base-0.
static bool checkParamIsIntegerType(Sema &S, const FunctionDecl *FD,
const AttributeList &Attr,
unsigned FuncParamNo, unsigned AttrArgNo,
bool AllowDependentType = false) {
assert(Attr.isArgExpr(AttrArgNo) && "Expected expression argument");
return checkParamIsIntegerType(S, FD, Attr, Attr.getArgAsExpr(AttrArgNo),
FuncParamNo, AttrArgNo, AllowDependentType);
}
static void handleAllocSizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1) ||
!checkAttributeAtMostNumArgs(S, Attr, 2))
return;
const auto *FD = cast<FunctionDecl>(D);
if (!FD->getReturnType()->isPointerType()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
<< Attr.getName();
return;
}
const Expr *SizeExpr = Attr.getArgAsExpr(0);
int SizeArgNo;
// Parameter indices are 1-indexed, hence Index=1
if (!checkPositiveIntArgument(S, Attr, SizeExpr, SizeArgNo, /*Index=*/1))
return;
if (!checkParamIsIntegerType(S, FD, Attr, SizeArgNo, /*AttrArgNo=*/0))
return;
// Args are 1-indexed, so 0 implies that the arg was not present
int NumberArgNo = 0;
if (Attr.getNumArgs() == 2) {
const Expr *NumberExpr = Attr.getArgAsExpr(1);
// Parameter indices are 1-based, hence Index=2
if (!checkPositiveIntArgument(S, Attr, NumberExpr, NumberArgNo,
/*Index=*/2))
return;
if (!checkParamIsIntegerType(S, FD, Attr, NumberArgNo, /*AttrArgNo=*/1))
return;
}
D->addAttr(::new (S.Context) AllocSizeAttr(
Attr.getRange(), S.Context, SizeArgNo, NumberArgNo,
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 bool checkFunctionConditionAttr(Sema &S, Decl *D,
const AttributeList &Attr,
Expr *&Cond, StringRef &Msg) {
Cond = Attr.getArgAsExpr(0);
if (!Cond->isTypeDependent()) {
ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
if (Converted.isInvalid())
return false;
Cond = Converted.get();
}
if (!S.checkStringLiteralArgumentAttr(Attr, 1, Msg))
return false;
if (Msg.empty())
Msg = "<no message provided>";
SmallVector<PartialDiagnosticAt, 8> Diags;
if (isa<FunctionDecl>(D) && !Cond->isValueDependent() &&
!Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(D),
Diags)) {
S.Diag(Attr.getLoc(), diag::err_attr_cond_never_constant_expr)
<< Attr.getName();
for (const PartialDiagnosticAt &PDiag : Diags)
S.Diag(PDiag.first, PDiag.second);
return false;
}
return true;
}
static void handleEnableIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
S.Diag(Attr.getLoc(), diag::ext_clang_enable_if);
Expr *Cond;
StringRef Msg;
if (checkFunctionConditionAttr(S, D, Attr, Cond, Msg))
D->addAttr(::new (S.Context)
EnableIfAttr(Attr.getRange(), S.Context, Cond, Msg,
Attr.getAttributeSpellingListIndex()));
}
namespace {
/// Determines if a given Expr references any of the given function's
/// ParmVarDecls, or the function's implicit `this` parameter (if applicable).
class ArgumentDependenceChecker
: public RecursiveASTVisitor<ArgumentDependenceChecker> {
#ifndef NDEBUG
const CXXRecordDecl *ClassType;
#endif
llvm::SmallPtrSet<const ParmVarDecl *, 16> Parms;
bool Result;
public:
ArgumentDependenceChecker(const FunctionDecl *FD) {
#ifndef NDEBUG
if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
ClassType = MD->getParent();
else
ClassType = nullptr;
#endif
Parms.insert(FD->param_begin(), FD->param_end());
}
bool referencesArgs(Expr *E) {
Result = false;
TraverseStmt(E);
return Result;
}
bool VisitCXXThisExpr(CXXThisExpr *E) {
assert(E->getType()->getPointeeCXXRecordDecl() == ClassType &&
"`this` doesn't refer to the enclosing class?");
Result = true;
return false;
}
bool VisitDeclRefExpr(DeclRefExpr *DRE) {
if (const auto *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl()))
if (Parms.count(PVD)) {
Result = true;
return false;
}
return true;
}
};
}
static void handleDiagnoseIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
S.Diag(Attr.getLoc(), diag::ext_clang_diagnose_if);
Expr *Cond;
StringRef Msg;
if (!checkFunctionConditionAttr(S, D, Attr, Cond, Msg))
return;
StringRef DiagTypeStr;
if (!S.checkStringLiteralArgumentAttr(Attr, 2, DiagTypeStr))
return;
DiagnoseIfAttr::DiagnosticType DiagType;
if (!DiagnoseIfAttr::ConvertStrToDiagnosticType(DiagTypeStr, DiagType)) {
S.Diag(Attr.getArgAsExpr(2)->getLocStart(),
diag::err_diagnose_if_invalid_diagnostic_type);
return;
}
bool ArgDependent = false;
if (const auto *FD = dyn_cast<FunctionDecl>(D))
ArgDependent = ArgumentDependenceChecker(FD).referencesArgs(Cond);
D->addAttr(::new (S.Context) DiagnoseIfAttr(
Attr.getRange(), S.Context, Cond, Msg, DiagType, ArgDependent, cast<NamedDecl>(D),
Attr.getAttributeSpellingListIndex()));
}
static void handlePassObjectSizeAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (D->hasAttr<PassObjectSizeAttr>()) {
S.Diag(D->getLocStart(), diag::err_attribute_only_once_per_parameter)
<< Attr.getName();
return;
}
Expr *E = Attr.getArgAsExpr(0);
uint32_t Type;
if (!checkUInt32Argument(S, Attr, E, Type, /*Idx=*/1))
return;
// pass_object_size's argument is passed in as the second argument of
// __builtin_object_size. So, it has the same constraints as that second
// argument; namely, it must be in the range [0, 3].
if (Type > 3) {
S.Diag(E->getLocStart(), diag::err_attribute_argument_outof_range)
<< Attr.getName() << 0 << 3 << E->getSourceRange();
return;
}
// pass_object_size is only supported on constant pointer parameters; as a
// kindness to users, we allow the parameter to be non-const for declarations.
// At this point, we have no clue if `D` belongs to a function declaration or
// definition, so we defer the constness check until later.
if (!cast<ParmVarDecl>(D)->getType()->isPointerType()) {
S.Diag(D->getLocStart(), diag::err_attribute_pointers_only)
<< Attr.getName() << 1;
return;
}
D->addAttr(::new (S.Context)
PassObjectSizeAttr(Attr.getRange(), S.Context, (int)Type,
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 (Attr.isArgIdent(ArgIndex)) {
IdentifierLoc *Ident = Attr.getArgAsIdent(ArgIndex);
StateString = Ident->Ident->getName();
Loc = Ident->Loc;
} else {
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) {
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) {
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 (!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 (!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)) {
bool BitfieldByteAligned = (!FD->getType()->isDependentType() &&
!FD->getType()->isIncompleteType() &&
FD->isBitField() &&
S.Context.getTypeAlign(FD->getType()) <= 8);
if (S.getASTContext().getTargetInfo().getTriple().isPS4()) {
if (BitfieldByteAligned)
// The PS4 target needs to maintain ABI backwards compatibility.
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 {
// Report warning about changed offset in the newer compiler versions.
if (BitfieldByteAligned)
S.Diag(Attr.getLoc(), diag::warn_attribute_packed_for_bitfield);
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 = nullptr;
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()));
}
bool Sema::isValidPointerAttrType(QualType T, bool RefOkay) {
if (RefOkay) {
if (T->isReferenceType())
return true;
} else {
T = T.getNonReferenceType();
}
// The nonnull attribute, and other similar attributes, can be applied to a
// transparent union that contains a pointer type.
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())
return true;
}
}
}
return T->isAnyPointerType() || T->isBlockPointerType();
}
static bool attrNonNullArgCheck(Sema &S, QualType T, const AttributeList &Attr,
SourceRange AttrParmRange,
SourceRange TypeRange,
bool isReturnValue = false) {
if (!S.isValidPointerAttrType(T)) {
if (isReturnValue)
S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
<< Attr.getName() << AttrParmRange << TypeRange;
else
S.Diag(Attr.getLoc(), diag::warn_attribute_pointers_only)
<< Attr.getName() << AttrParmRange << TypeRange << 0;
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?
if (Idx < getFunctionOrMethodNumParams(D) &&
!attrNonNullArgCheck(S, getFunctionOrMethodParamType(D, Idx), Attr,
Ex->getSourceRange(),
getFunctionOrMethodParamRange(D, Idx)))
continue;
NonNullArgs.push_back(Idx);
}
// If no arguments were specified to __attribute__((nonnull)) then all pointer
// arguments have a nonnull attribute; warn if there aren't any. Skip this
// check if the attribute came from a macro expansion or a template
// instantiation.
if (NonNullArgs.empty() && Attr.getLoc().isFileID() &&
!S.inTemplateInstantiation()) {
bool AnyPointers = isFunctionOrMethodVariadic(D);
for (unsigned I = 0, E = getFunctionOrMethodNumParams(D);
I != E && !AnyPointers; ++I) {
QualType T = getFunctionOrMethodParamType(D, I);
if (T->isDependentType() || S.isValidPointerAttrType(T))
AnyPointers = true;
}
if (!AnyPointers)
S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers);
}
unsigned *Start = NonNullArgs.data();
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, SourceRange(),
D->getSourceRange()))
return;
D->addAttr(::new (S.Context)
NonNullAttr(Attr.getRange(), S.Context, nullptr, 0,
Attr.getAttributeSpellingListIndex()));
}
static void handleReturnsNonNullAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
QualType ResultType = getFunctionOrMethodResultType(D);
SourceRange SR = getFunctionOrMethodResultSourceRange(D);
if (!attrNonNullArgCheck(S, ResultType, Attr, SourceRange(), SR,
/* isReturnValue */ true))
return;
D->addAttr(::new (S.Context)
ReturnsNonNullAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleNoEscapeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (D->isInvalidDecl())
return;
// noescape only applies to pointer types.
QualType T = cast<ParmVarDecl>(D)->getType();
if (!S.isValidPointerAttrType(T, /* RefOkay */ true)) {
S.Diag(Attr.getLoc(), diag::warn_attribute_pointers_only)
<< Attr.getName() << Attr.getRange() << 0;
return;
}
D->addAttr(::new (S.Context) NoEscapeAttr(
Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
}
static void handleAssumeAlignedAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
Expr *E = Attr.getArgAsExpr(0),
*OE = Attr.getNumArgs() > 1 ? Attr.getArgAsExpr(1) : nullptr;
S.AddAssumeAlignedAttr(Attr.getRange(), D, E, OE,
Attr.getAttributeSpellingListIndex());
}
static void handleAllocAlignAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
S.AddAllocAlignAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
Attr.getAttributeSpellingListIndex());
}
void Sema::AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
Expr *OE, unsigned SpellingListIndex) {
QualType ResultType = getFunctionOrMethodResultType(D);
SourceRange SR = getFunctionOrMethodResultSourceRange(D);
AssumeAlignedAttr TmpAttr(AttrRange, Context, E, OE, SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();
if (!isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
<< &TmpAttr << AttrRange << SR;
return;
}
if (!E->isValueDependent()) {
llvm::APSInt I(64);
if (!E->isIntegerConstantExpr(I, Context)) {
if (OE)
Diag(AttrLoc, diag::err_attribute_argument_n_type)
<< &TmpAttr << 1 << AANT_ArgumentIntegerConstant
<< E->getSourceRange();
else
Diag(AttrLoc, diag::err_attribute_argument_type)
<< &TmpAttr << AANT_ArgumentIntegerConstant
<< E->getSourceRange();
return;
}
if (!I.isPowerOf2()) {
Diag(AttrLoc, diag::err_alignment_not_power_of_two)
<< E->getSourceRange();
return;
}
}
if (OE) {
if (!OE->isValueDependent()) {
llvm::APSInt I(64);
if (!OE->isIntegerConstantExpr(I, Context)) {
Diag(AttrLoc, diag::err_attribute_argument_n_type)
<< &TmpAttr << 2 << AANT_ArgumentIntegerConstant
<< OE->getSourceRange();
return;
}
}
}
D->addAttr(::new (Context)
AssumeAlignedAttr(AttrRange, Context, E, OE, SpellingListIndex));
}
void Sema::AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
unsigned SpellingListIndex) {
QualType ResultType = getFunctionOrMethodResultType(D);
AllocAlignAttr TmpAttr(AttrRange, Context, 0, SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();
if (!ResultType->isDependentType() &&
!isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
<< &TmpAttr << AttrRange << getFunctionOrMethodResultSourceRange(D);
return;
}
uint64_t IndexVal;
const auto *FuncDecl = cast<FunctionDecl>(D);
if (!checkFunctionOrMethodParameterIndex(*this, FuncDecl, TmpAttr,
/*AttrArgNo=*/1, ParamExpr,
IndexVal))
return;
QualType Ty = getFunctionOrMethodParamType(D, IndexVal);
if (!Ty->isDependentType() && !Ty->isIntegralType(Context)) {
Diag(ParamExpr->getLocStart(), diag::err_attribute_integers_only)
<< &TmpAttr << FuncDecl->getParamDecl(IndexVal)->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));
}
/// Normalize the attribute, __foo__ becomes foo.
/// Returns true if normalization was applied.
static bool normalizeName(StringRef &AttrName) {
if (AttrName.size() > 4 && AttrName.startswith("__") &&
AttrName.endswith("__")) {
AttrName = AttrName.drop_front(2).drop_back(2);
return true;
}
return false;
}
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, nullptr, nullptr, 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;
StringRef ModuleName = Module->getName();
if (normalizeName(ModuleName)) {
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>()) {
// Cannot have two ownership attributes of different kinds for the same
// index.
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;
} 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.
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;
if (I->args_size())
S.Diag(AL.getLoc(), diag::note_ownership_returns_index_mismatch)
<< (unsigned)Idx + 1 << Ex->getSourceRange();
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 handleIFuncAttr(Sema &S, Decl *D, const AttributeList &Attr) {
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
return;
// Aliases should be on declarations, not definitions.
const auto *FD = cast<FunctionDecl>(D);
if (FD->isThisDeclarationADefinition()) {
S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << FD << 1;
return;
}
D->addAttr(::new (S.Context) IFuncAttr(Attr.getRange(), S.Context, Str,
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;
}
if (S.Context.getTargetInfo().getTriple().isNVPTX()) {
S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_nvptx);
}
// Aliases should be on declarations, not definitions.
if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
if (FD->isThisDeclarationADefinition()) {
S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << FD << 0;
return;
}
} else {
const auto *VD = cast<VarDecl>(D);
if (VD->isThisDeclarationADefinition() && VD->isExternallyVisible()) {
S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << VD << 0;
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.getRange(), Attr.getName()))
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.getRange(), Attr.getName()))
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 handleRestrictAttr(Sema &S, Decl *D, const AttributeList &Attr) {
QualType ResultType = getFunctionOrMethodResultType(D);
if (ResultType->isAnyPointerType() || ResultType->isBlockPointerType()) {
D->addAttr(::new (S.Context) RestrictAttr(
Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
return;
}
S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
<< Attr.getName() << getFunctionOrMethodResultSourceRange(D);
}
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;
}
if (CommonAttr *CA = S.mergeCommonAttr(D, Attr.getRange(), Attr.getName(),
Attr.getAttributeSpellingListIndex()))
D->addAttr(CA);
}
static void handleNakedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<DisableTailCallsAttr>(S, D, Attr.getRange(),
Attr.getName()))
return;
if (Attr.isDeclspecAttribute()) {
const auto &Triple = S.getASTContext().getTargetInfo().getTriple();
const auto &Arch = Triple.getArch();
if (Arch != llvm::Triple::x86 &&
(Arch != llvm::Triple::arm && Arch != llvm::Triple::thumb)) {
S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_on_arch)
<< Attr.getName() << Triple.getArchName();
return;
}
}
D->addAttr(::new (S.Context) NakedAttr(Attr.getRange(), S.Context,
Attr.getAttributeSpellingListIndex()));
}
static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &Attrs) {
if (hasDeclarator(D)) return;
if (S.CheckNoReturnAttr(Attrs))
return;
if (!isa<ObjCMethodDecl>(D)) {
S.Diag(Attrs.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attrs.getName() << ExpectedFunctionOrMethod;
return;
}
D->addAttr(::new (S.Context) NoReturnAttr(
Attrs.getRange(), S.Context, Attrs.getAttributeSpellingListIndex()));
}
static void handleNoCallerSavedRegsAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (S.CheckNoCallerSavedRegsAttr(Attr))
return;
D->addAttr(::new (S.Context) AnyX86NoCallerSavedRegistersAttr(
Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
}
bool Sema::CheckNoReturnAttr(const AttributeList &Attrs) {
if (!checkAttributeNumArgs(*this, Attrs, 0)) {
Attrs.setInvalid();
return true;
}
return false;
}
bool Sema::CheckNoCallerSavedRegsAttr(const AttributeList &Attr) {
// Check whether the attribute is valid on the current target.
if (!Attr.existsInTarget(Context.getTargetInfo())) {
Diag(Attr.getLoc(), diag::warn_unknown_attribute_ignored) << Attr.getName();
Attr.setInvalid();
return true;
}
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 (!isFunctionOrMethodOrBlock(D)) {
ValueDecl *VD = dyn_cast<ValueDecl>(D);
if (!VD || (!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 handleNotTailCalledAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (checkAttrMutualExclusion<AlwaysInlineAttr>(S, D, Attr.getRange(),
Attr.getName()))
return;
D->addAttr(::new (S.Context) NotTailCalledAttr(
Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
}
static void handleDisableTailCallsAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (checkAttrMutualExclusion<NakedAttr>(S, D, Attr.getRange(),
Attr.getName()))
return;
D->addAttr(::new (S.Context) DisableTailCallsAttr(
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 handleUnusedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
bool IsCXX17Attr = Attr.isCXX11Attribute() && !Attr.getScopeName();
if (IsCXX17Attr && isa<VarDecl>(D)) {
// The C++17 spelling of this attribute cannot be applied to a static data
// member per [dcl.attr.unused]p2.
if (cast<VarDecl>(D)->isStaticDataMember()) {
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedForMaybeUnused;
return;
}
}
// If this is spelled as the standard C++17 attribute, but not in C++17, warn
// about using it as an extension.
if (!S.getLangOpts().CPlusPlus17 && IsCXX17Attr)
S.Diag(Attr.getLoc(), diag::ext_cxx17_attr) << Attr.getName();
D->addAttr(::new (S.Context) UnusedAttr(
Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
}
static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
uint32_t priority = ConstructorAttr::DefaultPriority;
if (Attr.getNumArgs() &&
!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) {
uint32_t priority = DestructorAttr::DefaultPriority;
if (Attr.getNumArgs() &&
!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) {
// Handle the case where the attribute has a text message.
StringRef Str;
if (Attr.getNumArgs() == 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,
bool Implicit,
VersionTuple Introduced,
VersionTuple Deprecated,
VersionTuple Obsoleted,
bool IsUnavailable,
StringRef Message,
bool IsStrict,
StringRef Replacement,
AvailabilityMergeKind AMK,
unsigned AttrSpellingListIndex) {
VersionTuple MergedIntroduced = Introduced;
VersionTuple MergedDeprecated = Deprecated;
VersionTuple MergedObsoleted = Obsoleted;
bool FoundAny = false;
bool OverrideOrImpl = false;
switch (AMK) {
case AMK_None:
case AMK_Redeclaration:
OverrideOrImpl = false;
break;
case AMK_Override:
case AMK_ProtocolImplementation:
OverrideOrImpl = true;
break;
}
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;
}
// If there is an existing availability attribute for this platform that
// is explicit and the new one is implicit use the explicit one and
// discard the new implicit attribute.
if (!OldAA->isImplicit() && Implicit) {
return nullptr;
}
// If there is an existing attribute for this platform that is implicit
// and the new attribute is explicit then erase the old one and
// continue processing the attributes.
if (!Implicit && OldAA->isImplicit()) {
Attrs.erase(Attrs.begin() + i);
--e;
continue;
}
FoundAny = true;
VersionTuple OldIntroduced = OldAA->getIntroduced();
VersionTuple OldDeprecated = OldAA->getDeprecated();
VersionTuple OldObsoleted = OldAA->getObsoleted();
bool OldIsUnavailable = OldAA->getUnavailable();
if (!versionsMatch(OldIntroduced, Introduced, OverrideOrImpl) ||
!versionsMatch(Deprecated, OldDeprecated, OverrideOrImpl) ||
!versionsMatch(Obsoleted, OldObsoleted, OverrideOrImpl) ||
!(OldIsUnavailable == IsUnavailable ||
(OverrideOrImpl && !OldIsUnavailable && IsUnavailable))) {
if (OverrideOrImpl) {
int Which = -1;
VersionTuple FirstVersion;
VersionTuple SecondVersion;
if (!versionsMatch(OldIntroduced, Introduced, OverrideOrImpl)) {
Which = 0;
FirstVersion = OldIntroduced;
SecondVersion = Introduced;
} else if (!versionsMatch(Deprecated, OldDeprecated, OverrideOrImpl)) {
Which = 1;
FirstVersion = Deprecated;
SecondVersion = OldDeprecated;
} else if (!versionsMatch(Obsoleted, OldObsoleted, OverrideOrImpl)) {
Which = 2;
FirstVersion = Obsoleted;
SecondVersion = OldObsoleted;
}
if (Which == -1) {
Diag(OldAA->getLocation(),
diag::warn_mismatched_availability_override_unavail)
<< AvailabilityAttr::getPrettyPlatformName(Platform->getName())
<< (AMK == AMK_Override);
} else {
Diag(OldAA->getLocation(),
diag::warn_mismatched_availability_override)
<< Which
<< AvailabilityAttr::getPrettyPlatformName(Platform->getName())
<< FirstVersion.getAsString() << SecondVersion.getAsString()
<< (AMK == AMK_Override);
}
if (AMK == AMK_Override)
Diag(Range.getBegin(), diag::note_overridden_method);
else
Diag(Range.getBegin(), diag::note_protocol_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 nullptr;
// Only create a new attribute if !OverrideOrImpl, but we want to do
// the checking.
if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
MergedDeprecated, MergedObsoleted) &&
!OverrideOrImpl) {
auto *Avail = ::new (Context) AvailabilityAttr(Range, Context, Platform,
Introduced, Deprecated,
Obsoleted, IsUnavailable, Message,
IsStrict, Replacement,
AttrSpellingListIndex);
Avail->setImplicit(Implicit);
return Avail;
}
return nullptr;
}
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) // We warned about this already, so just return.
return;
AvailabilityChange Introduced = Attr.getAvailabilityIntroduced();
AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated();
AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted();
bool IsUnavailable = Attr.getUnavailableLoc().isValid();
bool IsStrict = Attr.getStrictLoc().isValid();
StringRef Str;
if (const StringLiteral *SE =
dyn_cast_or_null<StringLiteral>(Attr.getMessageExpr()))
Str = SE->getString();
StringRef Replacement;
if (const StringLiteral *SE =
dyn_cast_or_null<StringLiteral>(Attr.getReplacementExpr()))
Replacement = SE->getString();
AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND, Attr.getRange(), II,
false/*Implicit*/,
Introduced.Version,
Deprecated.Version,
Obsoleted.Version,
IsUnavailable, Str,
IsStrict, Replacement,
Sema::AMK_None,
Index);
if (NewAttr)
D->addAttr(NewAttr);
// Transcribe "ios" to "watchos" (and add a new attribute) if the versioning
// matches before the start of the watchOS platform.
if (S.Context.getTargetInfo().getTriple().isWatchOS()) {
IdentifierInfo *NewII = nullptr;
if (II->getName() == "ios")
NewII = &S.Context.Idents.get("watchos");
else if (II->getName() == "ios_app_extension")
NewII = &S.Context.Idents.get("watchos_app_extension");
if (NewII) {
auto adjustWatchOSVersion = [](VersionTuple Version) -> VersionTuple {
if (Version.empty())
return Version;
auto Major = Version.getMajor();
auto NewMajor = Major >= 9 ? Major - 7 : 0;
if (NewMajor >= 2) {
if (Version.getMinor().hasValue()) {
if (Version.getSubminor().hasValue())
return VersionTuple(NewMajor, Version.getMinor().getValue(),
Version.getSubminor().getValue());
else
return VersionTuple(NewMajor, Version.getMinor().getValue());
}
}
return VersionTuple(2, 0);
};
auto NewIntroduced = adjustWatchOSVersion(Introduced.Version);
auto NewDeprecated = adjustWatchOSVersion(Deprecated.Version);
auto NewObsoleted = adjustWatchOSVersion(Obsoleted.Version);
AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND,
Attr.getRange(),
NewII,
true/*Implicit*/,
NewIntroduced,
NewDeprecated,
NewObsoleted,
IsUnavailable, Str,
IsStrict,
Replacement,
Sema::AMK_None,
Index);
if (NewAttr)
D->addAttr(NewAttr);
}
} else if (S.Context.getTargetInfo().getTriple().isTvOS()) {
// Transcribe "ios" to "tvos" (and add a new attribute) if the versioning
// matches before the start of the tvOS platform.
IdentifierInfo *NewII = nullptr;
if (II->getName() == "ios")
NewII = &S.Context.Idents.get("tvos");
else if (II->getName() == "ios_app_extension")
NewII = &S.Context.Idents.get("tvos_app_extension");
if (NewII) {
AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND,
Attr.getRange(),
NewII,
true/*Implicit*/,
Introduced.Version,
Deprecated.Version,
Obsoleted.Version,
IsUnavailable, Str,
IsStrict,
Replacement,
Sema::AMK_None,
Index);
if (NewAttr)
D->addAttr(NewAttr);
}
}
}
static void handleExternalSourceSymbolAttr(Sema &S, Decl *D,
const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
return;
assert(checkAttributeAtMostNumArgs(S, Attr, 3) &&
"Invalid number of arguments in an external_source_symbol attribute");
StringRef Language;
if (const auto *SE = dyn_cast_or_null<StringLiteral>(Attr.getArgAsExpr(0)))
Language = SE->getString();
StringRef DefinedIn;
if (const auto *SE = dyn_cast_or_null<StringLiteral>(Attr.getArgAsExpr(1)))
DefinedIn = SE->getString();
bool IsGeneratedDeclaration = Attr.getArgAsIdent(2) != nullptr;
D->addAttr(::new (S.Context) ExternalSourceSymbolAttr(
Attr.getRange(), S.Context, Language, DefinedIn, IsGeneratedDeclaration,
Attr.getAttributeSpellingListIndex()));
}
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 nullptr;
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,