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//===--- SemaDeclAttr.cpp - Declaration Attribute Handling ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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/ScopeInfo.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);
}
/// 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 auto *BD = dyn_cast<BlockDecl>(D))
return BD->getNumParams();
return cast<ObjCMethodDecl>(D)->param_size();
}
static const ParmVarDecl *getFunctionOrMethodParam(const Decl *D,
unsigned Idx) {
if (const auto *FD = dyn_cast<FunctionDecl>(D))
return FD->getParamDecl(Idx);
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
return MD->getParamDecl(Idx);
if (const auto *BD = dyn_cast<BlockDecl>(D))
return BD->getParamDecl(Idx);
return nullptr;
}
static QualType getFunctionOrMethodParamType(const Decl *D, unsigned Idx) {
if (const FunctionType *FnTy = D->getFunctionType())
return cast<FunctionProtoType>(FnTy)->getParamType(Idx);
if (const auto *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 (auto *PVD = getFunctionOrMethodParam(D, Idx))
return PVD->getSourceRange();
return SourceRange();
}
static QualType getFunctionOrMethodResultType(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return 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())
return cast<FunctionProtoType>(FnTy)->isVariadic();
if (const auto *BD = dyn_cast<BlockDecl>(D))
return BD->isVariadic();
return cast<ObjCMethodDecl>(D)->isVariadic();
}
static bool isInstanceMethod(const Decl *D) {
if (const auto *MethodDecl = dyn_cast<CXXMethodDecl>(D))
return MethodDecl->isInstance();
return false;
}
static inline bool isNSStringType(QualType T, ASTContext &Ctx) {
const auto *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 auto *PT = T->getAs<PointerType>();
if (!PT)
return false;
const auto *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 ParsedAttr &AL) {
// FIXME: Include the type in the argument list.
return AL.getNumArgs() + AL.hasParsedType();
}
template <typename Compare>
static bool checkAttributeNumArgsImpl(Sema &S, const ParsedAttr &AL,
unsigned Num, unsigned Diag,
Compare Comp) {
if (Comp(getNumAttributeArgs(AL), Num)) {
S.Diag(AL.getLoc(), Diag) << AL << Num;
return false;
}
return true;
}
/// Check if the attribute has exactly as many args as Num. May
/// output an error.
static bool checkAttributeNumArgs(Sema &S, const ParsedAttr &AL, unsigned Num) {
return checkAttributeNumArgsImpl(S, AL, Num,
diag::err_attribute_wrong_number_arguments,
std::not_equal_to<unsigned>());
}
/// Check if the attribute has at least as many args as Num. May
/// output an error.
static bool checkAttributeAtLeastNumArgs(Sema &S, const ParsedAttr &AL,
unsigned Num) {
return checkAttributeNumArgsImpl(S, AL, Num,
diag::err_attribute_too_few_arguments,
std::less<unsigned>());
}
/// Check if the attribute has at most as many args as Num. May
/// output an error.
static bool checkAttributeAtMostNumArgs(Sema &S, const ParsedAttr &AL,
unsigned Num) {
return checkAttributeNumArgsImpl(S, AL, Num,
diag::err_attribute_too_many_arguments,
std::greater<unsigned>());
}
/// A helper function to provide Attribute Location for the Attr types
/// AND the ParsedAttr.
template <typename AttrInfo>
static typename std::enable_if<std::is_base_of<Attr, AttrInfo>::value,
SourceLocation>::type
getAttrLoc(const AttrInfo &AL) {
return AL.getLocation();
}
static SourceLocation getAttrLoc(const ParsedAttr &AL) { return AL.getLoc(); }
/// If Expr is a valid integer constant, get the value of the integer
/// expression and return success or failure. May output an error.
///
/// Negative argument is implicitly converted to unsigned, unless
/// \p StrictlyUnsigned is true.
template <typename AttrInfo>
static bool checkUInt32Argument(Sema &S, const AttrInfo &AI, const Expr *Expr,
uint32_t &Val, unsigned Idx = UINT_MAX,
bool StrictlyUnsigned = false) {
llvm::APSInt I(32);
if (Expr->isTypeDependent() || Expr->isValueDependent() ||
!Expr->isIntegerConstantExpr(I, S.Context)) {
if (Idx != UINT_MAX)
S.Diag(getAttrLoc(AI), diag::err_attribute_argument_n_type)
<< AI << Idx << AANT_ArgumentIntegerConstant
<< Expr->getSourceRange();
else
S.Diag(getAttrLoc(AI), diag::err_attribute_argument_type)
<< AI << 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;
}
if (StrictlyUnsigned && I.isSigned() && I.isNegative()) {
S.Diag(getAttrLoc(AI), diag::err_attribute_requires_positive_integer)
<< AI << /*non-negative*/ 1;
return false;
}
Val = (uint32_t)I.getZExtValue();
return true;
}
/// 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 &AI, const Expr *Expr,
int &Val, unsigned Idx = UINT_MAX) {
uint32_t UVal;
if (!checkUInt32Argument(S, AI, 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;
}
/// Diagnose mutually exclusive attributes when present on a given
/// declaration. Returns true if diagnosed.
template <typename AttrTy>
static bool checkAttrMutualExclusion(Sema &S, Decl *D, const ParsedAttr &AL) {
if (const auto *A = D->getAttr<AttrTy>()) {
S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible) << AL << A;
S.Diag(A->getLocation(), diag::note_conflicting_attribute);
return true;
}
return false;
}
template <typename AttrTy>
static bool checkAttrMutualExclusion(Sema &S, Decl *D, const Attr &AL) {
if (const auto *A = D->getAttr<AttrTy>()) {
S.Diag(AL.getLocation(), diag::err_attributes_are_not_compatible) << &AL
<< A;
S.Diag(A->getLocation(), diag::note_conflicting_attribute);
return true;
}
return false;
}
/// 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 &AI, unsigned AttrArgNum,
const Expr *IdxExpr, ParamIdx &Idx, bool CanIndexImplicitThis = 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(AI), diag::err_attribute_argument_n_type)
<< &AI << AttrArgNum << AANT_ArgumentIntegerConstant
<< IdxExpr->getSourceRange();
return false;
}
unsigned IdxSource = IdxInt.getLimitedValue(UINT_MAX);
if (IdxSource < 1 || (!IV && IdxSource > NumParams)) {
S.Diag(getAttrLoc(AI), diag::err_attribute_argument_out_of_bounds)
<< &AI << AttrArgNum << IdxExpr->getSourceRange();
return false;
}
if (HasImplicitThisParam && !CanIndexImplicitThis) {
if (IdxSource == 1) {
S.Diag(getAttrLoc(AI), diag::err_attribute_invalid_implicit_this_argument)
<< &AI << IdxExpr->getSourceRange();
return false;
}
}
Idx = ParamIdx(IdxSource, D);
return true;
}
/// 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 ParsedAttr &AL, unsigned ArgNum,
StringRef &Str,
SourceLocation *ArgLocation) {
// Look for identifiers. If we have one emit a hint to fix it to a literal.
if (AL.isArgIdent(ArgNum)) {
IdentifierLoc *Loc = AL.getArgAsIdent(ArgNum);
Diag(Loc->Loc, diag::err_attribute_argument_type)
<< AL << 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 = AL.getArgAsExpr(ArgNum);
const auto *Literal = dyn_cast<StringLiteral>(ArgExpr->IgnoreParenCasts());
if (ArgLocation)
*ArgLocation = ArgExpr->getBeginLoc();
if (!Literal || !Literal->isAscii()) {
Diag(ArgExpr->getBeginLoc(), diag::err_attribute_argument_type)
<< AL << AANT_ArgumentString;
return false;
}
Str = Literal->getString();
return true;
}
/// Applies the given attribute to the Decl without performing any
/// additional semantic checking.
template <typename AttrType>
static void handleSimpleAttribute(Sema &S, Decl *D, SourceRange SR,
unsigned SpellingIndex) {
D->addAttr(::new (S.Context) AttrType(SR, S.Context, SpellingIndex));
}
template <typename AttrType>
static void handleSimpleAttribute(Sema &S, Decl *D, const ParsedAttr &AL) {
handleSimpleAttribute<AttrType>(S, D, AL.getRange(),
AL.getAttributeSpellingListIndex());
}
template <typename... DiagnosticArgs>
static const Sema::SemaDiagnosticBuilder&
appendDiagnostics(const Sema::SemaDiagnosticBuilder &Bldr) {
return Bldr;
}
template <typename T, typename... DiagnosticArgs>
static const Sema::SemaDiagnosticBuilder&
appendDiagnostics(const Sema::SemaDiagnosticBuilder &Bldr, T &&ExtraArg,
DiagnosticArgs &&... ExtraArgs) {
return appendDiagnostics(Bldr << std::forward<T>(ExtraArg),
std::forward<DiagnosticArgs>(ExtraArgs)...);
}
/// Add an attribute {@code AttrType} to declaration {@code D}, provided that
/// {@code PassesCheck} is true.
/// Otherwise, emit diagnostic {@code DiagID}, passing in all parameters
/// specified in {@code ExtraArgs}.
template <typename AttrType, typename... DiagnosticArgs>
static void
handleSimpleAttributeOrDiagnose(Sema &S, Decl *D, SourceRange SR,
unsigned SpellingIndex,
bool PassesCheck,
unsigned DiagID, DiagnosticArgs&&... ExtraArgs) {
if (!PassesCheck) {
Sema::SemaDiagnosticBuilder DB = S.Diag(D->getBeginLoc(), DiagID);
appendDiagnostics(DB, std::forward<DiagnosticArgs>(ExtraArgs)...);
return;
}
handleSimpleAttribute<AttrType>(S, D, SR, SpellingIndex);
}
template <typename AttrType, typename... DiagnosticArgs>
static void
handleSimpleAttributeOrDiagnose(Sema &S, Decl *D, const ParsedAttr &AL,
bool PassesCheck,
unsigned DiagID,
DiagnosticArgs&&... ExtraArgs) {
return handleSimpleAttributeOrDiagnose<AttrType>(
S, D, AL.getRange(), AL.getAttributeSpellingListIndex(), PassesCheck,
DiagID, std::forward<DiagnosticArgs>(ExtraArgs)...);
}
template <typename AttrType>
static void handleSimpleAttributeWithExclusions(Sema &S, Decl *D,
const ParsedAttr &AL) {
handleSimpleAttribute<AttrType>(S, D, AL);
}
/// 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 ParsedAttr &AL) {
if (checkAttrMutualExclusion<IncompatibleAttrType>(S, D, AL))
return;
handleSimpleAttributeWithExclusions<AttrType, IncompatibleAttrTypes...>(S, D,
AL);
}
/// 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) {
auto IsOverloadedOperatorPresent = [&S](const RecordDecl *Record,
OverloadedOperatorKind Op) {
DeclContextLookupResult Result =
Record->lookup(S.Context.DeclarationNames.getCXXOperatorName(Op));
return !Result.empty();
};
const RecordDecl *Record = RT->getDecl();
bool foundStarOperator = IsOverloadedOperatorPresent(Record, OO_Star);
bool foundArrowOperator = IsOverloadedOperatorPresent(Record, OO_Arrow);
if (foundStarOperator && foundArrowOperator)
return true;
const CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record);
if (!CXXRecord)
return false;
for (auto BaseSpecifier : CXXRecord->bases()) {
if (!foundStarOperator)
foundStarOperator = IsOverloadedOperatorPresent(
BaseSpecifier.getType()->getAsRecordDecl(), OO_Star);
if (!foundArrowOperator)
foundArrowOperator = IsOverloadedOperatorPresent(
BaseSpecifier.getType()->getAsRecordDecl(), OO_Arrow);
}
if (foundStarOperator && foundArrowOperator)
return true;
return false;
}
/// 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 ParsedAttr &AL) {
const auto *VD = cast<ValueDecl>(D);
QualType QT = VD->getType();
if (QT->isAnyPointerType())
return true;
if (const auto *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(AL.getLoc(), diag::warn_thread_attribute_decl_not_pointer) << AL << QT;
return false;
}
/// 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 auto *RT = QT->getAs<RecordType>())
return RT;
// Now check if we point to record type.
if (const auto *PT = QT->getAs<PointerType>())
return PT->getPointeeType()->getAs<RecordType>();
return nullptr;
}
template <typename AttrType>
static bool checkRecordDeclForAttr(const RecordDecl *RD) {
// Check if the record itself has the attribute.
if (RD->hasAttr<AttrType>())
return true;
// Else check if any base classes have the attribute.
if (const auto *CRD = dyn_cast<CXXRecordDecl>(RD)) {
CXXBasePaths BPaths(false, false);
if (CRD->lookupInBases(
[](const CXXBaseSpecifier *BS, CXXBasePath &) {
const auto &Ty = *BS->getType();
// If it's type-dependent, we assume it could have the attribute.
if (Ty.isDependentType())
return true;
return Ty.getAs<RecordType>()->getDecl()->hasAttr<AttrType>();
},
BPaths, true))
return true;
}
return false;
}
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;
return checkRecordDeclForAttr<CapabilityAttr>(RT->getDecl());
}
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());
}
/// 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 ParsedAttr &AL,
SmallVectorImpl<Expr *> &Args,
unsigned Sidx = 0,
bool ParamIdxOk = false) {
if (Sidx == AL.getNumArgs()) {
// If we don't have any capability arguments, the attribute implicitly
// refers to 'this'. So we need to make sure that 'this' exists, i.e. we're
// a non-static method, and that the class is a (scoped) capability.
const auto *MD = dyn_cast<const CXXMethodDecl>(D);
if (MD && !MD->isStatic()) {
const CXXRecordDecl *RD = MD->getParent();
// FIXME -- need to check this again on template instantiation
if (!checkRecordDeclForAttr<CapabilityAttr>(RD) &&
!checkRecordDeclForAttr<ScopedLockableAttr>(RD))
S.Diag(AL.getLoc(),
diag::warn_thread_attribute_not_on_capability_member)
<< AL << MD->getParent();
} else {
S.Diag(AL.getLoc(), diag::warn_thread_attribute_not_on_non_static_member)
<< AL;
}
}
for (unsigned Idx = Sidx; Idx < AL.getNumArgs(); ++Idx) {
Expr *ArgExp = AL.getArgAsExpr(Idx);
if (ArgExp->isTypeDependent()) {
// FIXME -- need to check this again on template instantiation
Args.push_back(ArgExp);
continue;
}
if (const auto *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(AL.getLoc(), diag::warn_thread_attribute_ignored) << AL;
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 (const auto *UOp = dyn_cast<UnaryOperator>(ArgExp))
if (UOp->getOpcode() == UO_AddrOf)
if (const auto *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) {
const auto *FD = dyn_cast<FunctionDecl>(D);
const auto *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(AL.getLoc(),
diag::err_attribute_argument_out_of_bounds_extra_info)
<< AL << 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(AL.getLoc(), diag::warn_thread_attribute_argument_not_lockable)
<< AL << ArgTy;
Args.push_back(ArgExp);
}
}
//===----------------------------------------------------------------------===//
// Attribute Implementations
//===----------------------------------------------------------------------===//
static void handlePtGuardedVarAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!threadSafetyCheckIsPointer(S, D, AL))
return;
D->addAttr(::new (S.Context)
PtGuardedVarAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static bool checkGuardedByAttrCommon(Sema &S, Decl *D, const ParsedAttr &AL,
Expr *&Arg) {
SmallVector<Expr *, 1> Args;
// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, AL, Args);
unsigned Size = Args.size();
if (Size != 1)
return false;
Arg = Args[0];
return true;
}
static void handleGuardedByAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
Expr *Arg = nullptr;
if (!checkGuardedByAttrCommon(S, D, AL, Arg))
return;
D->addAttr(::new (S.Context) GuardedByAttr(
AL.getRange(), S.Context, Arg, AL.getAttributeSpellingListIndex()));
}
static void handlePtGuardedByAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
Expr *Arg = nullptr;
if (!checkGuardedByAttrCommon(S, D, AL, Arg))
return;
if (!threadSafetyCheckIsPointer(S, D, AL))
return;
D->addAttr(::new (S.Context) PtGuardedByAttr(
AL.getRange(), S.Context, Arg, AL.getAttributeSpellingListIndex()));
}
static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D, const ParsedAttr &AL,
SmallVectorImpl<Expr *> &Args) {
if (!checkAttributeAtLeastNumArgs(S, AL, 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(AL.getLoc(), diag::warn_thread_attribute_decl_not_lockable) << AL;
return false;
}
// Check that all arguments are lockable objects.
checkAttrArgsAreCapabilityObjs(S, D, AL, Args);
if (Args.empty())
return false;
return true;
}
static void handleAcquiredAfterAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
SmallVector<Expr *, 1> Args;
if (!checkAcquireOrderAttrCommon(S, D, AL, Args))
return;
Expr **StartArg = &Args[0];
D->addAttr(::new (S.Context) AcquiredAfterAttr(
AL.getRange(), S.Context, StartArg, Args.size(),
AL.getAttributeSpellingListIndex()));
}
static void handleAcquiredBeforeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
SmallVector<Expr *, 1> Args;
if (!checkAcquireOrderAttrCommon(S, D, AL, Args))
return;
Expr **StartArg = &Args[0];
D->addAttr(::new (S.Context) AcquiredBeforeAttr(
AL.getRange(), S.Context, StartArg, Args.size(),
AL.getAttributeSpellingListIndex()));
}
static bool checkLockFunAttrCommon(Sema &S, Decl *D, const ParsedAttr &AL,
SmallVectorImpl<Expr *> &Args) {
// zero or more arguments ok
// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, AL, Args, 0, /*ParamIdxOk=*/true);
return true;
}
static void handleAssertSharedLockAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
SmallVector<Expr *, 1> Args;
if (!checkLockFunAttrCommon(S, D, AL, Args))
return;
unsigned Size = Args.size();
Expr **StartArg = Size == 0 ? nullptr : &Args[0];
D->addAttr(::new (S.Context)
AssertSharedLockAttr(AL.getRange(), S.Context, StartArg, Size,
AL.getAttributeSpellingListIndex()));
}
static void handleAssertExclusiveLockAttr(Sema &S, Decl *D,
const ParsedAttr &AL) {
SmallVector<Expr *, 1> Args;
if (!checkLockFunAttrCommon(S, D, AL, Args))
return;
unsigned Size = Args.size();
Expr **StartArg = Size == 0 ? nullptr : &Args[0];
D->addAttr(::new (S.Context) AssertExclusiveLockAttr(
AL.getRange(), S.Context, StartArg, Size,
AL.getAttributeSpellingListIndex()));
}
/// 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.
///
/// 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) {
assert(AI.isArgExpr(AttrArgNo) && "Expected expression argument");
Expr *AttrArg = AI.getArgAsExpr(AttrArgNo);
ParamIdx Idx;
if (!checkFunctionOrMethodParameterIndex(S, FD, AI, AttrArgNo + 1, AttrArg,
Idx))
return false;
const ParmVarDecl *Param = FD->getParamDecl(Idx.getASTIndex());
if (!Param->getType()->isIntegerType() && !Param->getType()->isCharType()) {
SourceLocation SrcLoc = AttrArg->getBeginLoc();
S.Diag(SrcLoc, diag::err_attribute_integers_only)
<< AI << Param->getSourceRange();
return false;
}
return true;
}
static void handleAllocSizeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!checkAttributeAtLeastNumArgs(S, AL, 1) ||
!checkAttributeAtMostNumArgs(S, AL, 2))
return;
const auto *FD = cast<FunctionDecl>(D);
if (!FD->getReturnType()->isPointerType()) {
S.Diag(AL.getLoc(), diag::warn_attribute_return_pointers_only) << AL;
return;
}
const Expr *SizeExpr = AL.getArgAsExpr(0);
int SizeArgNoVal;
// Parameter indices are 1-indexed, hence Index=1
if (!checkPositiveIntArgument(S, AL, SizeExpr, SizeArgNoVal, /*Index=*/1))
return;
if (!checkParamIsIntegerType(S, FD, AL, /*AttrArgNo=*/0))
return;
ParamIdx SizeArgNo(SizeArgNoVal, D);
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, Val, /*Index=*/2))
return;
if (!checkParamIsIntegerType(S, FD, AL, /*AttrArgNo=*/1))
return;
NumberArgNo = ParamIdx(Val, D);
}
D->addAttr(::new (S.Context)
AllocSizeAttr(AL.getRange(), S.Context, SizeArgNo, NumberArgNo,
AL.getAttributeSpellingListIndex()));
}
static bool checkTryLockFunAttrCommon(Sema &S, Decl *D, const ParsedAttr &AL,
SmallVectorImpl<Expr *> &Args) {
if (!checkAttributeAtLeastNumArgs(S, AL, 1))
return false;
if (!isIntOrBool(AL.getArgAsExpr(0))) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
<< AL << 1 << AANT_ArgumentIntOrBool;
return false;
}
// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, AL, Args, 1);
return true;
}
static void handleSharedTrylockFunctionAttr(Sema &S, Decl *D,
const ParsedAttr &AL) {
SmallVector<Expr*, 2> Args;
if (!checkTryLockFunAttrCommon(S, D, AL, Args))
return;
D->addAttr(::new (S.Context) SharedTrylockFunctionAttr(
AL.getRange(), S.Context, AL.getArgAsExpr(0), Args.data(), Args.size(),
AL.getAttributeSpellingListIndex()));
}
static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D,
const ParsedAttr &AL) {
SmallVector<Expr*, 2> Args;
if (!checkTryLockFunAttrCommon(S, D, AL, Args))
return;
D->addAttr(::new (S.Context) ExclusiveTrylockFunctionAttr(
AL.getRange(), S.Context, AL.getArgAsExpr(0), Args.data(),
Args.size(), AL.getAttributeSpellingListIndex()));
}
static void handleLockReturnedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// check that the argument is lockable object
SmallVector<Expr*, 1> Args;
checkAttrArgsAreCapabilityObjs(S, D, AL, Args);
unsigned Size = Args.size();
if (Size == 0)
return;
D->addAttr(::new (S.Context)
LockReturnedAttr(AL.getRange(), S.Context, Args[0],
AL.getAttributeSpellingListIndex()));
}
static void handleLocksExcludedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!checkAttributeAtLeastNumArgs(S, AL, 1))
return;
// check that all arguments are lockable objects
SmallVector<Expr*, 1> Args;
checkAttrArgsAreCapabilityObjs(S, D, AL, Args);
unsigned Size = Args.size();
if (Size == 0)
return;
Expr **StartArg = &Args[0];
D->addAttr(::new (S.Context)
LocksExcludedAttr(AL.getRange(), S.Context, StartArg, Size,
AL.getAttributeSpellingListIndex()));
}
static bool checkFunctionConditionAttr(Sema &S, Decl *D, const ParsedAttr &AL,
Expr *&Cond, StringRef &Msg) {
Cond = AL.getArgAsExpr(0);
if (!Cond->isTypeDependent()) {
ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
if (Converted.isInvalid())
return false;
Cond = Converted.get();
}
if (!S.checkStringLiteralArgumentAttr(AL, 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(AL.getLoc(), diag::err_attr_cond_never_constant_expr) << AL;
for (const PartialDiagnosticAt &PDiag : Diags)
S.Diag(PDiag.first, PDiag.second);
return false;
}
return true;
}
static void handleEnableIfAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
S.Diag(AL.getLoc(), diag::ext_clang_enable_if);
Expr *Cond;
StringRef Msg;
if (checkFunctionConditionAttr(S, D, AL, Cond, Msg))
D->addAttr(::new (S.Context)
EnableIfAttr(AL.getRange(), S.Context, Cond, Msg,
AL.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 ParsedAttr &AL) {
S.Diag(AL.getLoc(), diag::ext_clang_diagnose_if);
Expr *Cond;
StringRef Msg;
if (!checkFunctionConditionAttr(S, D, AL, Cond, Msg))
return;
StringRef DiagTypeStr;
if (!S.checkStringLiteralArgumentAttr(AL, 2, DiagTypeStr))
return;
DiagnoseIfAttr::DiagnosticType DiagType;
if (!DiagnoseIfAttr::ConvertStrToDiagnosticType(DiagTypeStr, DiagType)) {
S.Diag(AL.getArgAsExpr(2)->getBeginLoc(),
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(
AL.getRange(), S.Context, Cond, Msg, DiagType, ArgDependent,
cast<NamedDecl>(D), AL.getAttributeSpellingListIndex()));
}
static void handlePassObjectSizeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (D->hasAttr<PassObjectSizeAttr>()) {
S.Diag(D->getBeginLoc(), diag::err_attribute_only_once_per_parameter) << AL;
return;
}
Expr *E = AL.getArgAsExpr(0);
uint32_t Type;
if (!checkUInt32Argument(S, AL, 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->getBeginLoc(), diag::err_attribute_argument_out_of_range)
<< AL << 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->getBeginLoc(), diag::err_attribute_pointers_only) << AL << 1;
return;
}
D->addAttr(::new (S.Context) PassObjectSizeAttr(
AL.getRange(), S.Context, (int)Type, AL.getAttributeSpellingListIndex()));
}
static void handleConsumableAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
ConsumableAttr::ConsumedState DefaultState;
if (AL.isArgIdent(0)) {
IdentifierLoc *IL = AL.getArgAsIdent(0);
if (!ConsumableAttr::ConvertStrToConsumedState(IL->Ident->getName(),
DefaultState)) {
S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << AL
<< IL->Ident;
return;
}
} else {
S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
<< AL << AANT_ArgumentIdentifier;
return;
}
D->addAttr(::new (S.Context)
ConsumableAttr(AL.getRange(), S.Context, DefaultState,
AL.getAttributeSpellingListIndex()));
}
static bool checkForConsumableClass(Sema &S, const CXXMethodDecl *MD,
const ParsedAttr &AL) {
QualType ThisType = MD->getThisType()->getPointeeType();
if (const CXXRecordDecl *RD = ThisType->getAsCXXRecordDecl()) {
if (!RD->hasAttr<ConsumableAttr>()) {
S.Diag(AL.getLoc(), diag::warn_attr_on_unconsumable_class) <<
RD->getNameAsString();
return false;
}
}
return true;
}
static void handleCallableWhenAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!checkAttributeAtLeastNumArgs(S, AL, 1))
return;
if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), AL))
return;
SmallVector<CallableWhenAttr::ConsumedState, 3> States;
for (unsigned ArgIndex = 0; ArgIndex < AL.getNumArgs(); ++ArgIndex) {
CallableWhenAttr::ConsumedState CallableState;
StringRef StateString;
SourceLocation Loc;
if (AL.isArgIdent(ArgIndex)) {
IdentifierLoc *Ident = AL.getArgAsIdent(ArgIndex);
StateString = Ident->Ident->getName();
Loc = Ident->Loc;
} else {
if (!S.checkStringLiteralArgumentAttr(AL, ArgIndex, StateString, &Loc))
return;
}
if (!CallableWhenAttr::ConvertStrToConsumedState(StateString,
CallableState)) {
S.Diag(Loc, diag::warn_attribute_type_not_supported) << AL << StateString;
return;
}
States.push_back(CallableState);
}
D->addAttr(::new (S.Context)
CallableWhenAttr(AL.getRange(), S.Context, States.data(),
States.size(), AL.getAttributeSpellingListIndex()));
}
static void handleParamTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
ParamTypestateAttr::ConsumedState ParamState;
if (AL.isArgIdent(0)) {
IdentifierLoc *Ident = AL.getArgAsIdent(0);
StringRef StateString = Ident->Ident->getName();
if (!ParamTypestateAttr::ConvertStrToConsumedState(StateString,
ParamState)) {
S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
<< AL << StateString;
return;
}
} else {
S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
<< AL << 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(AL.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
// ReturnType.getAsString();
// return;
//}
D->addAttr(::new (S.Context)
ParamTypestateAttr(AL.getRange(), S.Context, ParamState,
AL.getAttributeSpellingListIndex()));
}
static void handleReturnTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
ReturnTypestateAttr::ConsumedState ReturnState;
if (AL.isArgIdent(0)) {
IdentifierLoc *IL = AL.getArgAsIdent(0);
if (!ReturnTypestateAttr::ConvertStrToConsumedState(IL->Ident->getName(),
ReturnState)) {
S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << AL
<< IL->Ident;
return;
}
} else {
S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
<< AL << 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()->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(AL.getRange(), S.Context, ReturnState,
AL.getAttributeSpellingListIndex()));
}
static void handleSetTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), AL))
return;
SetTypestateAttr::ConsumedState NewState;
if (AL.isArgIdent(0)) {
IdentifierLoc *Ident = AL.getArgAsIdent(0);
StringRef Param = Ident->Ident->getName();
if (!SetTypestateAttr::ConvertStrToConsumedState(Param, NewState)) {
S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported) << AL
<< Param;
return;
}
} else {
S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
<< AL << AANT_ArgumentIdentifier;
return;
}
D->addAttr(::new (S.Context)
SetTypestateAttr(AL.getRange(), S.Context, NewState,
AL.getAttributeSpellingListIndex()));
}
static void handleTestTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), AL))
return;
TestTypestateAttr::ConsumedState TestState;
if (AL.isArgIdent(0)) {
IdentifierLoc *Ident = AL.getArgAsIdent(0);
StringRef Param = Ident->Ident->getName();
if (!TestTypestateAttr::ConvertStrToConsumedState(Param, TestState)) {
S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported) << AL
<< Param;
return;
}
} else {
S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
<< AL << AANT_ArgumentIdentifier;
return;
}
D->addAttr(::new (S.Context)
TestTypestateAttr(AL.getRange(), S.Context, TestState,
AL.getAttributeSpellingListIndex()));
}
static void handleExtVectorTypeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// 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 ParsedAttr &AL) {
if (auto *TD = dyn_cast<TagDecl>(D))
TD->addAttr(::new (S.Context) PackedAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
else if (auto *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(AL.getLoc(), diag::warn_attribute_ignored_for_field_of_type)
<< AL << FD->getType();
else
FD->addAttr(::new (S.Context) PackedAttr(
AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
} else {
// Report warning about changed offset in the newer compiler versions.
if (BitfieldByteAligned)
S.Diag(AL.getLoc(), diag::warn_attribute_packed_for_bitfield);
FD->addAttr(::new (S.Context) PackedAttr(
AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
}
} else
S.Diag(AL.getLoc(), diag::warn_attribute_ignored) << AL;
}
static bool checkIBOutletCommon(Sema &S, Decl *D, const ParsedAttr &AL) {
// 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 auto *VD = dyn_cast<ObjCIvarDecl>(D)) {
if (!VD->getType()->getAs<ObjCObjectPointerType>()) {
S.Diag(AL.getLoc(), diag::warn_iboutlet_object_type)
<< AL << VD->getType() << 0;
return false;
}
}
else if (const auto *PD = dyn_cast<ObjCPropertyDecl>(D)) {
if (!PD->getType()->getAs<ObjCObjectPointerType>()) {
S.Diag(AL.getLoc(), diag::warn_iboutlet_object_type)
<< AL << PD->getType() << 1;
return false;
}
}
else {
S.Diag(AL.getLoc(), diag::warn_attribute_iboutlet) << AL;
return false;
}
return true;
}
static void handleIBOutlet(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!checkIBOutletCommon(S, D, AL))
return;
D->addAttr(::new (S.Context)
IBOutletAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleIBOutletCollection(Sema &S, Decl *D, const ParsedAttr &AL) {
// The iboutletcollection attribute can have zero or one arguments.
if (AL.getNumArgs() > 1) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
return;
}
if (!checkIBOutletCommon(S, D, AL))
return;
ParsedType PT;
if (AL.hasParsedType())
PT = AL.getTypeArg();
else {
PT = S.getTypeName(S.Context.Idents.get("NSObject"), AL.getLoc(),
S.getScopeForContext(D->getDeclContext()->getParent()));
if (!PT) {
S.Diag(AL.getLoc(), diag::err_iboutletcollection_type) << "NSObject";
return;
}
}
TypeSourceInfo *QTLoc = nullptr;
QualType QT = S.GetTypeFromParser(PT, &QTLoc);
if (!QTLoc)
QTLoc = S.Context.getTrivialTypeSourceInfo(QT, AL.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(AL.getLoc(),
QT->isBuiltinType() ? diag::err_iboutletcollection_builtintype
: diag::err_iboutletcollection_type) << QT;
return;
}
D->addAttr(::new (S.Context)
IBOutletCollectionAttr(AL.getRange(), S.Context, QTLoc,
AL.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 ParsedAttr &AL,
SourceRange AttrParmRange,
SourceRange TypeRange,
bool isReturnValue = false) {
if (!S.isValidPointerAttrType(T)) {
if (isReturnValue)
S.Diag(AL.getLoc(), diag::warn_attribute_return_pointers_only)
<< AL << AttrParmRange << TypeRange;
else
S.Diag(AL.getLoc(), diag::warn_attribute_pointers_only)
<< AL << AttrParmRange << TypeRange << 0;
return false;
}
return true;
}
static void handleNonNullAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
SmallVector<ParamIdx, 8> NonNullArgs;
for (unsigned I = 0; I < AL.getNumArgs(); ++I) {
Expr *Ex = AL.getArgAsExpr(I);
ParamIdx Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, I + 1, Ex, Idx))
return;
// Is the function argument a pointer type?
if (Idx.getASTIndex() < getFunctionOrMethodNumParams(D) &&
!attrNonNullArgCheck(
S, getFunctionOrMethodParamType(D, Idx.getASTIndex()), AL,
Ex->getSourceRange(),
getFunctionOrMethodParamRange(D, Idx.getASTIndex())))
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() && AL.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(AL.getLoc(), diag::warn_attribute_nonnull_no_pointers);
}
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()));
}
static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
const ParsedAttr &AL) {
if (AL.getNumArgs() > 0) {
if (D->getFunctionType()) {
handleNonNullAttr(S, D, AL);
} else {
S.Diag(AL.getLoc(), diag::warn_attribute_nonnull_parm_no_args)
<< D->getSourceRange();
}
return;
}
// Is the argument a pointer type?
if (!attrNonNullArgCheck(S, D->getType(), AL, SourceRange(),
D->getSourceRange()))
return;
D->addAttr(::new (S.Context)
NonNullAttr(AL.getRange(), S.Context, nullptr, 0,
AL.getAttributeSpellingListIndex()));
}
static void handleReturnsNonNullAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
QualType ResultType = getFunctionOrMethodResultType(D);
SourceRange SR = getFunctionOrMethodResultSourceRange(D);
if (!attrNonNullArgCheck(S, ResultType, AL, SourceRange(), SR,
/* isReturnValue */ true))
return;
D->addAttr(::new (S.Context)
ReturnsNonNullAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleNoEscapeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (D->isInvalidDecl())
return;
// noescape only applies to pointer types.
QualType T = cast<ParmVarDecl>(D)->getType();
if (!S.isValidPointerAttrType(T, /* RefOkay */ true)) {
S.Diag(AL.getLoc(), diag::warn_attribute_pointers_only)
<< AL << AL.getRange() << 0;
return;
}
D->addAttr(::new (S.Context) NoEscapeAttr(
AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
}
static void handleAssumeAlignedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
Expr *E = AL.getArgAsExpr(0),
*OE = AL.getNumArgs() > 1 ? AL.getArgAsExpr(1) : nullptr;
S.AddAssumeAlignedAttr(AL.getRange(), D, E, OE,
AL.getAttributeSpellingListIndex());
}
static void handleAllocAlignAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
S.AddAllocAlignAttr(AL.getRange(), D, AL.getArgAsExpr(0),
AL.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, ParamIdx(), 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;
}
ParamIdx Idx;
const auto *FuncDecl = cast<FunctionDecl>(D);
if (!checkFunctionOrMethodParameterIndex(*this, FuncDecl, TmpAttr,
/*AttrArgNo=*/1, ParamExpr, Idx))
return;
QualType Ty = getFunctionOrMethodParamType(D, Idx.getASTIndex());
if (!Ty->isDependentType() && !Ty->isIntegralType(Context)) {
Diag(ParamExpr->getBeginLoc(), diag::err_attribute_integers_only)
<< &TmpAttr
<< FuncDecl->getParamDecl(Idx.getASTIndex())->getSourceRange();
return;
}
D->addAttr(::new (Context)
AllocAlignAttr(AttrRange, Context, Idx, 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 ParsedAttr &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 << 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 << 2;
return;
}
break;
case OwnershipAttr::Returns:
if (AL.getNumArgs() > 2) {
S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments) << AL << 1;
return;
}
break;
}
IdentifierInfo *Module = AL.getArgAsIdent(0)->Ident;
StringRef ModuleName = Module->getName();
if (normalizeName(ModuleName)) {
Module = &S.PP.getIdentifierTable().get(ModuleName);
}
SmallVector<ParamIdx, 8> OwnershipArgs;
for (unsigned i = 1; i < AL.getNumArgs(); ++i) {
Expr *Ex = AL.getArgAsExpr(i);
ParamIdx Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, AL, i, Ex, Idx))
return;
// Is the function argument a pointer type?
QualType T = getFunctionOrMethodParamType(D, Idx.getASTIndex());
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 << 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 << I;
return;
} else if (K == OwnershipAttr::Returns &&
I->getOwnKind() == OwnershipAttr::Returns) {
// A returns attribute conflicts with any other returns attribute using
// 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()->getSourceIndex();
if (I->args_size())
S.Diag(AL.getLoc(), diag::note_ownership_returns_index_mismatch)
<< Idx.getSourceIndex() << Ex->getSourceRange();
return;
}
}
}
OwnershipArgs.push_back(Idx);
}
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()));
}
static void handleWeakRefAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// Check the attribute arguments.
if (AL.getNumArgs() > 1) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
return;
}
// 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(AL.getLoc(), diag::err_attribute_weakref_not_global_context)
<< cast<NamedDecl>(D);
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 (AL.getNumArgs() && S.checkStringLiteralArgumentAttr(AL, 0, Str))
// GCC will accept anything as the argument of weakref. Should we
// check for an existing decl?
D->addAttr(::new (S.Context) AliasAttr(AL.getRange(), S.Context, Str,
AL.getAttributeSpellingListIndex()));
D->addAttr(::new (S.Context)
WeakRefAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleIFuncAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(AL, 0, Str))
return;
// Aliases should be on declarations, not definitions.
const auto *FD = cast<FunctionDecl>(D);
if (FD->isThisDeclarationADefinition()) {
S.Diag(AL.getLoc(), diag::err_alias_is_definition) << FD << 1;
return;
}
D->addAttr(::new (S.Context) IFuncAttr(AL.getRange(), S.Context, Str,
AL.getAttributeSpellingListIndex()));
}
static void handleAliasAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(AL, 0, Str))
return;
if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
S.Diag(AL.getLoc(), diag::err_alias_not_supported_on_darwin);
return;
}
if (S.Context.getTargetInfo().getTriple().isNVPTX()) {
S.Diag(AL.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(AL.getLoc(), diag::err_alias_is_definition) << FD << 0;
return;
}
} else {
const auto *VD = cast<VarDecl>(D);
if (VD->isThisDeclarationADefinition() && VD->isExternallyVisible()) {
S.Diag(AL.getLoc(), diag::err_alias_is_definition) << VD << 0;
return;
}
}
// Mark target used to prevent unneeded-internal-declaration warnings.
if (!S.LangOpts.CPlusPlus) {
// FIXME: demangle Str for C++, as the attribute refers to the mangled
// linkage name, not the pre-mangled identifier.
const DeclarationNameInfo target(&S.Context.Idents.get(Str), AL.getLoc());
LookupResult LR(S, target, Sema::LookupOrdinaryName);
if (S.LookupQualifiedName(LR, S.getCurLexicalContext()))
for (NamedDecl *ND : LR)
ND->markUsed(S.Context);
}
D->addAttr(::new (S.Context) AliasAttr(AL.getRange(), S.Context, Str,
AL.getAttributeSpellingListIndex()));
}
static void handleTLSModelAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
StringRef Model;
SourceLocation LiteralLoc;
// Check that it is a string.
if (!S.checkStringLiteralArgumentAttr(AL, 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(AL.getRange(), S.Context, Model,
AL.getAttributeSpellingListIndex()));
}
static void handleRestrictAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
QualType ResultType = getFunctionOrMethodResultType(D);
if (ResultType->isAnyPointerType() || ResultType->isBlockPointerType()) {
D->addAttr(::new (S.Context) RestrictAttr(
AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
return;
}
S.Diag(AL.getLoc(), diag::warn_attribute_return_pointers_only)
<< AL << getFunctionOrMethodResultSourceRange(D);
}
static void handleCPUSpecificAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
FunctionDecl *FD = cast<FunctionDecl>(D);
if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
if (MD->getParent()->isLambda()) {
S.Diag(AL.getLoc(), diag::err_attribute_dll_lambda) << AL;
return;
}
}
if (!checkAttributeAtLeastNumArgs(S, AL, 1))
return;
SmallVector<IdentifierInfo *, 8> CPUs;
for (unsigned ArgNo = 0; ArgNo < getNumAttributeArgs(AL); ++ArgNo) {
if (!AL.isArgIdent(ArgNo)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
<< AL << AANT_ArgumentIdentifier;
return;
}
IdentifierLoc *CPUArg = AL.getArgAsIdent(ArgNo);
StringRef CPUName = CPUArg->Ident->getName().trim();
if (!S.Context.getTargetInfo().validateCPUSpecificCPUDispatch(CPUName)) {
S.Diag(CPUArg->Loc, diag::err_invalid_cpu_specific_dispatch_value)
<< CPUName << (AL.getKind() == ParsedAttr::AT_CPUDispatch);
return;
}
const TargetInfo &Target = S.Context.getTargetInfo();
if (llvm::any_of(CPUs, [CPUName, &Target](const IdentifierInfo *Cur) {
return Target.CPUSpecificManglingCharacter(CPUName) ==
Target.CPUSpecificManglingCharacter(Cur->getName());
})) {
S.Diag(AL.getLoc(), diag::warn_multiversion_duplicate_entries);
return;
}
CPUs.push_back(CPUArg->Ident);
}
FD->setIsMultiVersion(true);
if (AL.getKind() == ParsedAttr::AT_CPUSpecific)
D->addAttr(::new (S.Context) CPUSpecificAttr(
AL.getRange(), S.Context, CPUs.data(), CPUs.size(),
AL.getAttributeSpellingListIndex()));
else
D->addAttr(::new (S.Context) CPUDispatchAttr(
AL.getRange(), S.Context, CPUs.data(), CPUs.size(),
AL.getAttributeSpellingListIndex()));
}
static void handleCommonAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (S.LangOpts.CPlusPlus) {
S.Diag(AL.getLoc(), diag::err_attribute_not_supported_in_lang)
<< AL << AttributeLangSupport::Cpp;
return;
}
if (CommonAttr *CA = S.mergeCommonAttr(D, AL))
D->addAttr(CA);
}
static void handleNakedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (checkAttrMutualExclusion<DisableTailCallsAttr>(S, D, AL))
return;
if (AL.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(AL.getLoc(), diag::err_attribute_not_supported_on_arch)
<< AL << Triple.getArchName();
return;
}
}
D->addAttr(::new (S.Context) NakedAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleNoReturnAttr(Sema &S, Decl *D, const ParsedAttr &Attrs) {
if (hasDeclarator(D)) return;
if (!isa<ObjCMethodDecl>(D)) {
S.Diag(Attrs.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attrs << ExpectedFunctionOrMethod;
return;
}
D->addAttr(::new (S.Context) NoReturnAttr(
Attrs.getRange(), S.Context, Attrs.getAttributeSpellingListIndex()));
}
static void handleNoCfCheckAttr(Sema &S, Decl *D, const ParsedAttr &Attrs) {
if (!S.getLangOpts().CFProtectionBranch)
S.Diag(Attrs.getLoc(), diag::warn_nocf_check_attribute_ignored);
else
handleSimpleAttribute<AnyX86NoCfCheckAttr>(S, D, Attrs);
}
bool Sema::CheckAttrNoArgs(const ParsedAttr &Attrs) {
if (!checkAttributeNumArgs(*this, Attrs, 0)) {
Attrs.setInvalid();
return true;
}
return false;
}
bool Sema::CheckAttrTarget(const ParsedAttr &AL) {
// Check whether the attribute is valid on the current target.
if (!AL.existsInTarget(Context.getTargetInfo())) {
Diag(AL.getLoc(), diag::warn_unknown_attribute_ignored) << AL;
AL.setInvalid();
return true;
}
return false;
}
static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// 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(AL.getLoc(), AL.isCXX11Attribute()
? diag::err_attribute_wrong_decl_type
: diag::warn_attribute_wrong_decl_type)
<< AL << ExpectedFunctionMethodOrBlock;
return;
}
}
D->addAttr(::new (S.Context)
AnalyzerNoReturnAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
// PS3 PPU-specific.
static void handleVecReturnAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
/*
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(AL.getLoc(), diag::err_repeat_attribute) << A;
return;
}
const auto *R = cast<RecordDecl>(D);
int count = 0;
if (!isa<CXXRecordDecl>(R)) {
S.Diag(AL.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
return;
}
if (!cast<CXXRecordDecl>(R)->isPOD()) {
S.Diag(AL.getLoc(), diag::err_attribute_vecreturn_only_pod_record);
return;
}
for (const auto *I : R->fields()) {
if ((count == 1) || !I->getType()->isVectorType()) {
S.Diag(AL.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
return;
}
count++;
}
D->addAttr(::new (S.Context) VecReturnAttr(
AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
}
static void handleDependencyAttr(Sema &S, Scope *Scope, Decl *D,
const ParsedAttr &AL) {
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(AL.getLoc(),
diag::err_carries_dependency_param_not_function_decl);
return;
}
}
D->addAttr(::new (S.Context) CarriesDependencyAttr(
AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleUnusedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
bool IsCXX17Attr = AL.isCXX11Attribute() && !AL.getScopeName();
// 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(AL.getLoc(), diag::ext_cxx17_attr) << AL;
D->addAttr(::new (S.Context) UnusedAttr(
AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
}
static void handleConstructorAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
uint32_t priority = ConstructorAttr::DefaultPriority;
if (AL.getNumArgs() &&
!checkUInt32Argument(S, AL, AL.getArgAsExpr(0), priority))
return;
D->addAttr(::new (S.Context)
ConstructorAttr(AL.getRange(), S.Context, priority,
AL.getAttributeSpellingListIndex()));
}
static void handleDestructorAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
uint32_t priority = DestructorAttr::DefaultPriority;
if (AL.getNumArgs() &&
!checkUInt32Argument(S, AL, AL.getArgAsExpr(0), priority))
return;
D->addAttr(::new (S.Context)
DestructorAttr(AL.getRange(), S.Context, priority,
AL.getAttributeSpellingListIndex()));
}
template <typename AttrTy>
static void handleAttrWithMessage(Sema &S, Decl *D, const ParsedAttr &AL) {
// Handle the case where the attribute has a text message.
StringRef Str;
if (AL.getNumArgs() == 1 && !S.checkStringLiteralArgumentAttr(AL, 0, Str))
return;
D->addAttr(::new (S.Context) AttrTy(AL.getRange(), S.Context, Str,
AL.getAttributeSpellingListIndex()));
}
static void handleObjCSuppresProtocolAttr(Sema &S, Decl *D,
const ParsedAttr &AL) {
if (!cast<ObjCProtocolDecl>(D)->isThisDeclarationADefinition()) {
S.Diag(AL.getLoc(), diag::err_objc_attr_protocol_requires_definition)
<< AL << AL.getRange();
return;
}
D->addAttr(::new (S.Context)
ObjCExplicitProtocolImplAttr(AL.getRange(), S.Context,
AL.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;
}
/// 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, int Priority, 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 auto *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
// has a lower priority use the existing one and discard the new
// attribute.
if (OldAA->getPriority() < Priority)
return nullptr;
// If there is an existing attribute for this platform that has a higher
// priority than the new attribute then erase the old one and continue
// processing the attributes.
if (OldAA->getPriority() > Priority) {
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, Priority, AttrSpellingListIndex);
Avail->setImplicit(Implicit);
return Avail;
}
return nullptr;
}
static void handleAvailabilityAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!checkAttributeNumArgs(S, AL, 1))
return;
IdentifierLoc *Platform = AL.getArgAsIdent(0);
unsigned Index = AL.getAttributeSpellingListIndex();
IdentifierInfo *II = Platform->Ident;
if (AvailabilityAttr::getPrettyPlatformName(II->getName()).empty())
S.Diag(Platform->Loc, diag::warn_availability_unknown_platform)
<< Platform->Ident;
auto *ND = dyn_cast<NamedDecl>(D);
if (!ND) // We warned about this already, so just return.
return;
AvailabilityChange Introduced = AL.getAvailabilityIntroduced();
AvailabilityChange Deprecated = AL.getAvailabilityDeprecated();
AvailabilityChange Obsoleted = AL.getAvailabilityObsoleted();
bool IsUnavailable = AL.getUnavailableLoc().isValid();
bool IsStrict = AL.getStrictLoc().isValid();
StringRef Str;
if (const auto *SE = dyn_cast_or_null<StringLiteral>(AL.getMessageExpr()))
Str = SE->getString();
StringRef Replacement;
if (const auto *SE = dyn_cast_or_null<StringLiteral>(AL.getReplacementExpr()))
Replacement = SE->getString();
if (II->isStr("swift")) {
if (Introduced.isValid() || Obsoleted.isValid() ||
(!IsUnavailable && !Deprecated.isValid())) {
S.Diag(AL.getLoc(),
diag::warn_availability_swift_unavailable_deprecated_only);
return;
}
}
int PriorityModifier = AL.isPragmaClangAttribute()
? Sema::AP_PragmaClangAttribute
: Sema::AP_Explicit;
AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(
ND, AL.getRange(), II, false /*Implicit*/, Introduced.Version,
Deprecated.Version, Obsoleted.Version, IsUnavailable, Str, IsStrict,
Replacement, Sema::AMK_None, PriorityModifier, 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, AL.getRange(), NewII, true /*Implicit*/, NewIntroduced,
NewDeprecated, NewObsoleted, IsUnavailable, Str, IsStrict,
Replacement, Sema::AMK_None,
PriorityModifier + Sema::AP_InferredFromOtherPlatform, 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, AL.getRange(), NewII, true /*Implicit*/, Introduced.Version,
Deprecated.Version, Obsoleted.Version, IsUnavailable, Str, IsStrict,
Replacement, Sema::AMK_None,
PriorityModifier + Sema::AP_InferredFromOtherPlatform, Index);
if (NewAttr)
D->addAttr(NewAttr);
}
}
}
static void handleExternalSourceSymbolAttr(Sema &S, Decl *D,
const ParsedAttr &AL) {
if (!checkAttributeAtLeastNumArgs(S, AL, 1))
return;
assert(checkAttributeAtMostNumArgs(S, AL, 3) &&
"Invalid number of arguments in an external_source_symbol attribute");
StringRef Language;
if (const auto *SE = dyn_cast_or_null<StringLiteral>(AL.getArgAsExpr(0)))
Language = SE->getString();
StringRef DefinedIn;
if (const auto *SE = dyn_cast_or_null<StringLiteral>(AL.getArgAsExpr(1)))
DefinedIn = SE->getString();
bool IsGeneratedDeclaration = AL.getArgAsIdent(2) != nullptr;
D->addAttr(::new (S.Context) ExternalSourceSymbolAttr(
AL.getRange(), S.Context, Language, DefinedIn, IsGeneratedDeclaration,
AL.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,
unsigned AttrSpellingListIndex) {
return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, Range, Vis,
AttrSpellingListIndex);
}
static void handleVisibilityAttr(Sema &S, Decl *D, const ParsedAttr &AL,
bool isTypeVisibility) {
// Visibility attributes don't mean anything on a typedef.
if (isa<TypedefNameDecl>(D)) {
S.Diag(AL.getRange().getBegin(), diag::warn_attribute_ignored) << AL;
return;
}
// 'type_visibility' can only go on a type or namespace.
if (isTypeVisibility &&
!(isa<TagDecl>(D) ||
isa<ObjCInterfaceDecl>(D) ||
isa<NamespaceDecl>(D))) {
S.Diag(AL.getRange().getBegin(), diag::err_attribute_wrong_decl_type)
<< AL << ExpectedTypeOrNamespace;
return;
}
// Check that the argument is a string literal.
StringRef TypeStr;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(AL, 0, TypeStr, &LiteralLoc))
return;
VisibilityAttr::VisibilityType type;
if (!VisibilityAttr::ConvertStrToVisibilityType(TypeStr, type)) {
S.Diag(LiteralLoc, diag::warn_attribute_type_not_supported) << AL
<< TypeStr;
return;
}
// Complain about attempts to use protected visibility on targets
// (like Darwin) that don't support it.
if (type == VisibilityAttr::Protected &&
!S.Context.getTargetInfo().hasProtectedVisibility()) {
S.Diag(AL.getLoc(), diag::warn_attribute_protected_visibility);
type = VisibilityAttr::Default;
}
unsigned Index = AL.getAttributeSpellingListIndex();
Attr *newAttr;
if (isTypeVisibility) {
newAttr = S.mergeTypeVisibilityAttr(D, AL.getRange(),
(TypeVisibilityAttr::VisibilityType) type,
Index);
} else {
newAttr = S.mergeVisibilityAttr(D, AL.getRange(), type, Index);
}
if (newAttr)
D->addAttr(newAttr);
}
static void handleObjCMethodFamilyAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
const auto *M = cast<ObjCMethodDecl>(D);
if (!AL.isArgIdent(0)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
<< AL << 1 << AANT_ArgumentIdentifier;
return;
}
IdentifierLoc *IL = AL.getArgAsIdent(0);
ObjCMethodFamilyAttr::FamilyKind F;
if (!ObjCMethodFamilyAttr::ConvertStrToFamilyKind(IL->Ident->getName(), F)) {
S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << AL << IL->Ident;
return;
}
if (F == ObjCMethodFamilyAttr::OMF_init &&
!M->getReturnType()->isObjCObjectPointerType()) {
S.Diag(M->getLocation(), diag::err_init_method_bad_return_type)
<< M->getReturnType();
// Ignore the attribute.
return;
}
D->addAttr(new (S.Context) ObjCMethodFamilyAttr(
AL.getRange(), S.Context, F, AL.getAttributeSpellingListIndex()));
}
static void handleObjCNSObject(Sema &S, Decl *D, const ParsedAttr &AL) {
if (const auto *TD = dyn_cast<TypedefNameDecl>(D)) {
QualType T = TD->getUnderlyingType();
if (!T->isCARCBridgableType()) {
S.Diag(TD->getLocation(), diag::err_nsobject_attribute);
return;
}
}
else if (const auto *PD = dyn_cast<ObjCPropertyDecl>(D)) {
QualType T = PD->getType();
if (!T->isCARCBridgableType()) {
S.Diag(PD->getLocation(), diag::err_nsobject_attribute);
return;
}
}
else {
// It is okay to include this attribute on properties, e.g.:
//
// @property (retain, nonatomic) struct Bork *Q __attribute__((NSObject));
//
// In this case it follows tradition and suppresses an error in the above
// case.
S.Diag(D->getLocation(), diag::warn_nsobject_attribute);
}
D->addAttr(::new (S.Context)
ObjCNSObjectAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleObjCIndependentClass(Sema &S, Decl *D, const ParsedAttr &AL) {
if (const auto *TD = dyn_cast<TypedefNameDecl>(D)) {
QualType T = TD->getUnderlyingType();
if (!T->isObjCObjectPointerType()) {
S.Diag(TD->getLocation(), diag::warn_ptr_independentclass_attribute);
return;
}
} else {
S.Diag(D->getLocation(), diag::warn_independentclass_attribute);
return;
}
D->addAttr(::new (S.Context)
ObjCIndependentClassAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleBlocksAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!AL.isArgIdent(0)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
<< AL << 1 << AANT_ArgumentIdentifier;
return;
}
IdentifierInfo *II = AL.getArgAsIdent(0)->Ident;
BlocksAttr::BlockType type;
if (!BlocksAttr::ConvertStrToBlockType(II->getName(), type)) {
S.Diag(AL.getLoc(), diag::warn_attribute_type_not_supported) << AL << II;
return;
}
D->addAttr(::new (S.Context)
BlocksAttr(AL.getRange(), S.Context, type,
AL.getAttributeSpellingListIndex()));
}
static void handleSentinelAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
unsigned sentinel = (unsigned)SentinelAttr::DefaultSentinel;
if (AL.getNumArgs() > 0) {
Expr *E = AL.getArgAsExpr(0);
llvm::APSInt Idx(32);
if (E->isTypeDependent() || E->isValueDependent() ||
!E->isIntegerConstantExpr(Idx, S.Context)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
<< AL << 1 << AANT_ArgumentIntegerConstant << E->getSourceRange();
return;
}
if (Idx.isSigned() && Idx.isNegative()) {
S.Diag(AL.getLoc(), diag::err_attribute_sentinel_less_than_zero)
<< E->getSourceRange();
return;
}
sentinel = Idx.getZExtValue();
}
unsigned nullPos = (unsigned)SentinelAttr::DefaultNullPos;
if (AL.getNumArgs() > 1) {
Expr *E = AL.getArgAsExpr(1);
llvm::APSInt Idx(32);
if (E->isTypeDependent() || E->isValueDependent() ||
!E->isIntegerConstantExpr(Idx, S.Context)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
<< AL << 2 << AANT_ArgumentIntegerConstant << E->getSourceRange();
return;
}
nullPos = Idx.getZExtValue();
if ((Idx.isSigned() && Idx.isNegative()) || nullPos > 1) {
// FIXME: This error message could be improved, it would be nice
// to say what the bounds actually are.
S.Diag(AL.getLoc(), diag::err_attribute_sentinel_not_zero_or_one)
<< E->getSourceRange();
return;
}
}
if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
const FunctionType *FT = FD->getType()->castAs<FunctionType>();
if (isa<FunctionNoProtoType>(FT)) {
S.Diag(AL.getLoc(), diag::warn_attribute_sentinel_named_arguments);
return;
}
if (!cast<FunctionProtoType>(FT)->isVariadic()) {
S.Diag(AL.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
return;
}
} else if (const auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
if (!MD->isVariadic()) {
S.Diag(AL.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
return;
}
} else if (const auto *BD = dyn_cast<BlockDecl>(D)) {
if (!BD->isVariadic()) {
S.Diag(AL.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 1;
return;
}
} else if (const auto *V = dyn_cast<VarDecl>(D)) {
QualType Ty = V->getType();
if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
const FunctionType *FT = Ty->isFunctionPointerType()
? D->getFunctionType()
: Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
if (!cast<FunctionProtoType>(FT)->isVariadic()) {
int m = Ty->isFunctionPointerType() ? 0 : 1;
S.Diag(AL.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m;
return;
}
} else {
S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
<< AL << ExpectedFunctionMethodOrBlock;
return;
}
} else {
S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
<< AL << ExpectedFunctionMethodOrBlock;
return;
}
D->addAttr(::new (S.Context)
SentinelAttr(AL.getRange(), S.Context, sentinel, nullPos,
AL.getAttributeSpellingListIndex()));
}
static void handleWarnUnusedResult(Sema &S, Decl *D, const ParsedAttr &AL) {
if (D->getFunctionType() &&
D->getFunctionType()->getReturnType()->isVoidType()) {
S.Diag(AL.getLoc(), diag::warn_attribute_void_function_method) << AL << 0;
return;
}
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
if (MD->getReturnType()->isVoidType()) {
S.Diag(AL.getLoc(), diag::warn_attribute_void_function_method) << AL << 1;
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 && AL.isCXX11Attribute() &&
!AL.getScopeName())
S.Diag(AL.getLoc(), diag::ext_cxx17_attr) << AL;
D->addAttr(::new (S.Context)
WarnUnusedResultAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleWeakImportAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// weak_import only applies to variable & function declarations.
bool isDef = false;
if (!D->canBeWeakImported(isDef)) {
if (isDef)
S.Diag(AL.getLoc(), diag::warn_attribute_invalid_on_definition)
<< "weak_import";
else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) ||
(S.Context.getTargetInfo().getTriple().isOSDarwin() &&
(isa<ObjCInterfaceDecl>(D) || isa<EnumDecl>(D)))) {
// Nothing to warn about here.
} else
S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
<< AL << ExpectedVariableOrFunction;
return;
}
D->addAttr(::new (S.Context)
WeakImportAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
// Handles reqd_work_group_size and work_group_size_hint.
template <typename WorkGroupAttr>
static void handleWorkGroupSize(Sema &S, Decl *D, const ParsedAttr &AL) {
uint32_t WGSize[3];
for (unsigned i = 0; i < 3; ++i) {
const Expr *E = AL.getArgAsExpr(i);
if (!checkUInt32Argument(S, AL, E, WGSize[i], i,
/*StrictlyUnsigned=*/true))
return;
if (WGSize[i] == 0) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_is_zero)
<< AL << E->getSourceRange();
return;
}
}
WorkGroupAttr *Existing = D->getAttr<WorkGroupAttr>();
if (Existing && !(Existing->getXDim() == WGSize[0] &&
Existing->getYDim() == WGSize[1] &&
Existing->getZDim() == WGSize[2]))
S.Diag(AL.getLoc(), diag::warn_duplicate_attribute) << AL;
D->addAttr(::new (S.Context) WorkGroupAttr(AL.getRange(), S.Context,
WGSize[0], WGSize[1], WGSize[2],
AL.getAttributeSpellingListIndex()));
}
// Handles intel_reqd_sub_group_size.
static void handleSubGroupSize(Sema &S, Decl *D, const ParsedAttr &AL) {
uint32_t SGSize;
const Expr *E = AL.getArgAsExpr(0);
if (!checkUInt32Argument(S, AL, E, SGSize))
return;
if (SGSize == 0) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_is_zero)
<< AL << E->getSourceRange();
return;
}
OpenCLIntelReqdSubGroupSizeAttr *Existing =
D->getAttr<OpenCLIntelReqdSubGroupSizeAttr>();
if (Existing && Existing->getSubGroupSize() != SGSize)
S.Diag(AL.getLoc(), diag::warn_duplicate_attribute) << AL;
D->addAttr(::new (S.Context) OpenCLIntelReqdSubGroupSizeAttr(
AL.getRange(), S.Context, SGSize,
AL.getAttributeSpellingListIndex()));
}
static void handleVecTypeHint(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!AL.hasParsedType()) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
return;
}
TypeSourceInfo *ParmTSI = nullptr;
QualType ParmType = S.GetTypeFromParser(AL.getTypeArg(), &ParmTSI);
assert(ParmTSI && "no type source info for attribute argument");
if (!ParmType->isExtVectorType() && !ParmType->isFloatingType() &&
(ParmType->isBooleanType() ||
!ParmType->isIntegralType(S.getASTContext()))) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_vec_type_hint)
<< ParmType;
return;
}
if (VecTypeHintAttr *A = D->getAttr<VecTypeHintAttr>()) {
if (!S.Context.hasSameType(A->getTypeHint(), ParmType)) {
S.Diag(AL.getLoc(), diag::warn_duplicate_attribute) << AL;
return;
}
}
D->addAttr(::new (S.Context) VecTypeHintAttr(AL.getLoc(), S.Context,
ParmTSI,
AL.getAttributeSpellingListIndex()));
}
SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range,
StringRef Name,
unsigned AttrSpellingListIndex) {
// Explicit or partial specializations do not inherit
// the section attribute from the primary template.
if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
if (AttrSpellingListIndex == SectionAttr::Declspec_allocate &&
FD->isFunctionTemplateSpecialization())
return nullptr;
}
if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) {
if (ExistingAttr->getName() == Name)
return nullptr;
Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section)
<< 1 /*section*/;
Diag(Range.getBegin(), diag::note_previous_attribute);
return nullptr;
}
return ::new (Context) SectionAttr(Range, Context, Name,
AttrSpellingListIndex);
}
bool Sema::checkSectionName(SourceLocation LiteralLoc, StringRef SecName) {
std::string Error = Context.getTargetInfo().isValidSectionSpecifier(SecName);
if (!Error.empty()) {
Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target) << Error
<< 1 /*'section'*/;
return false;
}
return true;
}
static void handleSectionAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// Make sure that there is a string literal as the sections's single
// argument.
StringRef Str;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &LiteralLoc))
return;
if (!S.checkSectionName(LiteralLoc, Str))
return;
// If the target wants to validate the section specifier, make it happen.
std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(Str);
if (!Error.empty()) {
S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target)
<< Error;
return;
}
unsigned Index = AL.getAttributeSpellingListIndex();
SectionAttr *NewAttr = S.mergeSectionAttr(D, AL.getRange(), Str, Index);
if (NewAttr)
D->addAttr(NewAttr);
}
static bool checkCodeSegName(Sema&S, SourceLocation LiteralLoc, StringRef CodeSegName) {
std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(CodeSegName);
if (!Error.empty()) {
S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target) << Error
<< 0 /*'code-seg'*/;
return false;
}
return true;
}
CodeSegAttr *Sema::mergeCodeSegAttr(Decl *D, SourceRange Range,
StringRef Name,
unsigned AttrSpellingListIndex) {
// Explicit or partial specializations do not inherit
// the code_seg attribute from the primary template.
if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
if (FD->isFunctionTemplateSpecialization())
return nullptr;
}
if (const auto *ExistingAttr = D->getAttr<CodeSegAttr>()) {
if (ExistingAttr->getName() == Name)
return nullptr;
Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section)
<< 0 /*codeseg*/;
Diag(Range.getBegin(), diag::note_previous_attribute);
return nullptr;
}
return ::new (Context) CodeSegAttr(Range, Context, Name,
AttrSpellingListIndex);
}
static void handleCodeSegAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
StringRef Str;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &LiteralLoc))
return;
if (!checkCodeSegName(S, LiteralLoc, Str))
return;
if (const auto *ExistingAttr = D->getAttr<CodeSegAttr>()) {
if (!ExistingAttr->isImplicit()) {
S.Diag(AL.getLoc(),
ExistingAttr->getName() == Str
? diag::warn_duplicate_codeseg_attribute
: diag::err_conflicting_codeseg_attribute);
return;
}
D->dropAttr<CodeSegAttr>();
}
if (CodeSegAttr *CSA = S.mergeCodeSegAttr(D, AL.getRange(), Str,
AL.getAttributeSpellingListIndex()))
D->addAttr(CSA);
}
// Check for things we'd like to warn about. Multiversioning issues are
// handled later in the process, once we know how many exist.
bool Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
enum FirstParam { Unsupported, Duplicate };
enum SecondParam { None, Architecture };
for (auto Str : {"tune=", "fpmath="})
if (AttrStr.find(Str) != StringRef::npos)
return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
<< Unsupported << None << Str;
TargetAttr::ParsedTargetAttr ParsedAttrs = TargetAttr::parse(AttrStr);
if (!ParsedAttrs.Architecture.empty() &&
!Context.getTargetInfo().isValidCPUName(ParsedAttrs.Architecture))
return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
<< Unsupported << Architecture << ParsedAttrs.Architecture;
if (ParsedAttrs.DuplicateArchitecture)
return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
<< Duplicate << None << "arch=";
for (const auto &Feature : ParsedAttrs.Features) {
auto CurFeature = StringRef(Feature).drop_front(); // remove + or -.
if (!Context.getTargetInfo().isValidFeatureName(CurFeature))
return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
<< Unsupported << None << CurFeature;
}
return false;
}
static void handleTargetAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
StringRef Str;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &LiteralLoc) ||
S.checkTargetAttr(LiteralLoc, Str))
return;
unsigned Index = AL.getAttributeSpellingListIndex();
TargetAttr *NewAttr =
::new (S.Context) TargetAttr(AL.getRange(), S.Context, Str, Index);
D->addAttr(NewAttr);
}
static void handleMinVectorWidthAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
Expr *E = AL.getArgAsExpr(0);
uint32_t VecWidth;
if (!checkUInt32Argument(S, AL, E, VecWidth)) {
AL.setInvalid();
return;
}
MinVectorWidthAttr *Existing = D->getAttr<MinVectorWidthAttr>();
if (Existing && Existing->getVectorWidth() != VecWidth) {
S.Diag(AL.getLoc(), diag::warn_duplicate_attribute) << AL;
return;
}
D->addAttr(::new (S.Context)
MinVectorWidthAttr(AL.getRange(), S.Context, VecWidth,
AL.getAttributeSpellingListIndex()));
}
static void handleCleanupAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
Expr *E = AL.getArgAsExpr(0);
SourceLocation Loc = E->getExprLoc();
FunctionDecl *FD = nullptr;
DeclarationNameInfo NI;
// gcc only allows for simple identifiers. Since we support more than gcc, we
// will warn the user.
if (auto *DRE = dyn_cast<DeclRefExpr>(E)) {
if (DRE->hasQualifier())
S.Diag(Loc, diag::warn_cleanup_ext);
FD = dyn_cast<FunctionDecl>(DRE->getDecl());
NI = DRE->getNameInfo();
if (!FD) {
S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 1
<< NI.getName();
return;
}
} else if (auto *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
if (ULE->hasExplicitTemplateArgs())
S.Diag(Loc, diag::warn_cleanup_ext);
FD = S.ResolveSingleFunctionTemplateSpecialization(ULE, true);
NI = ULE->getNameInfo();
if (!FD) {
S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 2
<< NI.getName();
if (ULE->getType() == S.Context.OverloadTy)
S.NoteAllOverloadCandidates(ULE);
return;
}
} else {
S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 0;
return;
}
if (FD->getNumParams() != 1) {
S.Diag(Loc, diag::err_attribute_cleanup_func_must_take_one_arg)
<< NI.getName();
return;
}
// We're currently more strict than GCC about what function types we accept.
// If this ever proves to be a problem it should be easy to fix.
QualType Ty = S.Context.getPointerType(cast<VarDecl>(D)->getType());
QualType ParamTy = FD->getParamDecl(0)->getType();
if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(),
ParamTy, Ty) != Sema::Compatible) {
S.Diag(Loc, diag::err_attribute_cleanup_func_arg_incompatible_type)
<< NI.getName() << ParamTy << Ty;
return;
}
D->addAttr(::new (S.Context)
CleanupAttr(AL.getRange(), S.Context, FD,
AL.getAttributeSpellingListIndex()));
}
static void handleEnumExtensibilityAttr(Sema &S, Decl *D,
const ParsedAttr &AL) {
if (!AL.isArgIdent(0)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
<< AL << 0 << AANT_ArgumentIdentifier;
return;
}
EnumExtensibilityAttr::Kind ExtensibilityKind;
IdentifierInfo *II = AL.getArgAsIdent(0)->Ident;
if (!EnumExtensibilityAttr::ConvertStrToKind(II->getName(),
ExtensibilityKind)) {
S.Diag(AL.getLoc(), diag::warn_attribute_type_not_supported) << AL << II;
return;
}
D->addAttr(::new (S.Context) EnumExtensibilityAttr(
AL.getRange(), S.Context, ExtensibilityKind,
AL.getAttributeSpellingListIndex()));
}
/// Handle __attribute__((format_arg((idx)))) attribute based on
/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
static void handleFormatArgAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
Expr *IdxExpr = AL.getArgAsExpr(0);
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.getASTIndex());
bool NotNSStringTy = !isNSStringType(Ty, S.Context);
if (NotNSStringTy &&
!isCFStringType(Ty, S.Context) &&
(!Ty->isPointerType() ||
!Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
S.Diag(AL.getLoc(), diag::err_format_attribute_not)
<< "a string type" << IdxExpr->getSourceRange()
<< getFunctionOrMethodParamRange(D, 0);
return;
}
Ty = getFunctionOrMethodResultType(D);
if (!isNSStringType(Ty, S.Context) &&
!isCFStringType(Ty, S.Context) &&
(!Ty->isPointerType() ||
!Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
S.Diag(AL.getLoc(), diag::err_format_attribute_result_not)
<< (NotNSStringTy ? "string type" : "NSString")
<< IdxExpr->getSourceRange() << getFunctionOrMethodParamRange(D, 0);
return;
}
D->addAttr(::new (S.Context) FormatArgAttr(
AL.getRange(), S.Context, Idx, AL.getAttributeSpellingListIndex()));
}
enum FormatAttrKind {
CFStringFormat,
NSStringFormat,
StrftimeFormat,
SupportedFormat,
IgnoredFormat,
InvalidFormat
};
/// getFormatAttrKind - Map from format attribute names to supported format
/// types.
static FormatAttrKind getFormatAttrKind(StringRef Format) {
return llvm::StringSwitch<FormatAttrKind>(Format)
// Check for formats that get handled specially.
.Case("NSString", NSStringFormat)
.Case("CFString", CFStringFormat)
.Case("strftime", StrftimeFormat)
// Otherwise, check for supported formats.
.Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
.Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
.Case("kprintf", SupportedFormat) // OpenBSD.
.Case("freebsd_kprintf", SupportedFormat) // FreeBSD.
.Case("os_trace", SupportedFormat)
.Case("os_log", SupportedFormat)
.Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
.Default(InvalidFormat);
}
/// Handle __attribute__((init_priority(priority))) attributes based on
/// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html
static void handleInitPriorityAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!S.getLangOpts().CPlusPlus) {
S.Diag(AL.getLoc(), diag::warn_attribute_ignored) << AL;
return;
}
if (S.getCurFunctionOrMethodDecl()) {
S.Diag(AL.getLoc(), diag::err_init_priority_object_attr);
AL.setInvalid();
return;
}
QualType T = cast<VarDecl>(D)->getType();
if (S.Context.getAsArrayType(T))
T = S.Context.getBaseElementType(T);
if (!T->getAs<RecordType>()) {
S.Diag(AL.getLoc(), diag::err_init_priority_object_attr);
AL.setInvalid();
return;
}
Expr *E = AL.getArgAsExpr(0);
uint32_t prioritynum;
if (!checkUInt32Argument(S, AL, E, prioritynum)) {
AL.setInvalid();
return;
}
if (prioritynum < 101 || prioritynum > 65535) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_range)
<< E->getSourceRange() << AL << 101 << 65535;
AL.setInvalid();
return;
}
D->addAttr(::new (S.Context)
InitPriorityAttr(AL.getRange(), S.Context, prioritynum,
AL.getAttributeSpellingListIndex()));
}
FormatAttr *Sema::mergeFormatAttr(Decl *D, SourceRange Range,
IdentifierInfo *Format, int FormatIdx,
int FirstArg,
unsigned AttrSpellingListIndex) {
// Check whether we already have an equivalent format attribute.
for (auto *F : D->specific_attrs<FormatAttr>()) {
if (F->getType() == Format &&
F->getFormatIdx() == FormatIdx &&
F->getFirstArg() == FirstArg) {
// If we don't have a valid location for this attribute, adopt the
// location.
if (F->getLocation().isInvalid())
F->setRange(Range);
return nullptr;
}
}
return ::new (Context) FormatAttr(Range, Context, Format, FormatIdx,
FirstArg, AttrSpellingListIndex);
}
/// Handle __attribute__((format(type,idx,firstarg))) attributes based on
/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
static void handleFormatAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!AL.isArgIdent(0)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
<< AL << 1 << AANT_ArgumentIdentifier;
return;
}
// In C++ the implicit 'this' function parameter also counts, and they are
// counted from one.
bool HasImplicitThisParam = isInstanceMethod(D);
unsigned NumArgs = getFunctionOrMethodNumParams(D) + HasImplicitThisParam;
IdentifierInfo *II = AL.getArgAsIdent(0)->Ident;
StringRef Format = II->getName();
if (normalizeName(Format)) {
// If we've modified the string name, we need a new identifier for it.
II = &S.Context.Idents.get(Format);
}
// Check for supported formats.
FormatAttrKind Kind = getFormatAttrKind(Format);
if (Kind == IgnoredFormat)
return;
if (Kind == InvalidFormat) {
S.Diag(AL.getLoc(), diag::warn_attribute_type_not_supported)
<< AL << II->getName();
return;
}
// checks for the 2nd argument
Expr *IdxExpr = AL.getArgAsExpr(1);
uint32_t Idx;
if (!checkUInt32Argument(S, AL, IdxExpr, Idx, 2))
return;
if (Idx < 1 || Idx > NumArgs) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< AL << 2 << IdxExpr->getSourceRange();
return;
}
// FIXME: Do we need to bounds check?
unsigned ArgIdx = Idx - 1;
if (HasImplicitThisParam) {
if (ArgIdx == 0) {
S.Diag(AL.getLoc(),
diag::err_format_attribute_implicit_this_format_string)
<< IdxExpr->getSourceRange();
return;
}
ArgIdx--;
}
// make sure the format string is really a string
QualType Ty = getFunctionOrMethodParamType(D, ArgIdx);
if (Kind == CFStringFormat) {
if (!isCFStringType(Ty, S.Context)) {
S.Diag(AL.getLoc(), diag::err_format_attribute_not)
<< "a CFString" << IdxExpr->getSourceRange()
<< getFunctionOrMethodParamRange(D, ArgIdx);
return;
}
} else if (Kind == NSStringFormat) {
// FIXME: do we need to check if the type is NSString*? What are the
// semantics?
if (!isNSStringType(Ty, S.Context)) {
S.Diag(AL.getLoc(), diag::err_format_attribute_not)
<< "an NSString" << IdxExpr->getSourceRange()
<< getFunctionOrMethodParamRange(D, ArgIdx);
return;
}
} else if (!Ty->isPointerType() ||
!Ty->getAs<PointerType>()->getPointeeType()->isCharType()) {
S.Diag(AL.getLoc(), diag::err_format_attribute_not)
<< "a string type" << IdxExpr->getSourceRange()
<< getFunctionOrMethodParamRange(D, ArgIdx);
return;
}
// check the 3rd argument
Expr *FirstArgExpr = AL.getArgAsExpr(2);
uint32_t FirstArg;
if (!checkUInt32Argument(S, AL, FirstArgExpr, FirstArg, 3))
return;
// check if the function is variadic if the 3rd argument non-zero
if (FirstArg != 0) {
if (isFunctionOrMethodVariadic(D)) {
++NumArgs; // +1 for ...
} else {
S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic);
return;
}
}
// strftime requires FirstArg to be 0 because it doesn't read from any
// variable the input is just the current time + the format string.
if (Kind == StrftimeFormat) {
if (FirstArg != 0) {
S.Diag(AL.getLoc(), diag::err_format_strftime_third_parameter)
<< FirstArgExpr->getSourceRange();
return;
}
// if 0 it disables parameter checking (to use with e.g. va_list)
} else if (FirstArg != 0 && FirstArg != NumArgs) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< AL << 3 << FirstArgExpr->getSourceRange();
return;
}
FormatAttr *NewAttr = S.mergeFormatAttr(D, AL.getRange(), II,
Idx, FirstArg,
AL.getAttributeSpellingListIndex());
if (NewAttr)
D->addAttr(NewAttr);
}
/// Handle __attribute__((callback(CalleeIdx, PayloadIdx0, ...))) attributes.
static void handleCallbackAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// The index that identifies the callback callee is mandatory.
if (AL.getNumArgs() == 0) {
S.Diag(AL.getLoc(), diag::err_callback_attribute_no_callee)
<< AL.getRange();
return;
}
bool HasImplicitThisParam = isInstanceMethod(D);
int32_t NumArgs = getFunctionOrMethodNumParams(D);
FunctionDecl *FD = D->getAsFunction();
assert(FD && "Expected a function declaration!");
llvm::StringMap<int> NameIdxMapping;
NameIdxMapping["__"] = -1;
NameIdxMapping["this"] = 0;
int Idx = 1;
for (const ParmVarDecl *PVD : FD->parameters())
NameIdxMapping[PVD->getName()] = Idx++;
auto UnknownName = NameIdxMapping.end();
SmallVector<int, 8> EncodingIndices;
for (unsigned I = 0, E = AL.getNumArgs(); I < E; ++I) {
SourceRange SR;
int32_t ArgIdx;
if (AL.isArgIdent(I)) {
IdentifierLoc *IdLoc = AL.getArgAsIdent(I);
auto It = NameIdxMapping.find(IdLoc->Ident->getName());
if (It == UnknownName) {
S.Diag(AL.getLoc(), diag::err_callback_attribute_argument_unknown)
<< IdLoc->Ident << IdLoc->Loc;
return;
}
SR = SourceRange(IdLoc->Loc);
ArgIdx = It->second;
} else if (AL.isArgExpr(I)) {
Expr *IdxExpr = AL.getArgAsExpr(I);
// If the expression is not parseable as an int32_t we have a problem.
if (!checkUInt32Argument(S, AL, IdxExpr, (uint32_t &)ArgIdx, I + 1,
false)) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< AL << (I + 1) << IdxExpr->getSourceRange();
return;
}
// Check oob, excluding the special values, 0 and -1.
if (ArgIdx < -1 || ArgIdx > NumArgs) {
S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
<< AL << (I + 1) << IdxExpr->getSourceRange();
return;
}
SR = IdxExpr->getSourceRange();
} else {
llvm_unreachable("Unexpected ParsedAttr argument type!");
}
if (ArgIdx == 0 && !HasImplicitThisParam) {
S.Diag(AL.getLoc(), diag::err_callback_implicit_this_not_available)
<< (I + 1) << SR;
return;
}
// Adjust for the case we do not have an implicit "this" parameter. In this
// case we decrease all positive values by 1 to get LLVM argument indices.
if (!HasImplicitThisParam && ArgIdx > 0)
ArgIdx -= 1;
EncodingIndices.push_back(ArgIdx);
}
int CalleeIdx = EncodingIndices.front();
// Check if the callee index is proper, thus not "this" and not "unknown".
// This means the "CalleeIdx" has to be non-negative if "HasImplicitThisParam"
// is false and positive if "HasImplicitThisParam" is true.
if (CalleeIdx < (int)HasImplicitThisParam) {
S.Diag(AL.getLoc(), diag::err_callback_attribute_invalid_callee)
<< AL.getRange();
return;
}
// Get the callee type, note the index adjustment as the AST doesn't contain
// the this type (which the callee cannot reference anyway!).
const Type *CalleeType =
getFunctionOrMethodParamType(D, CalleeIdx - HasImplicitThisParam)
.getTypePtr();
if (!CalleeType || !CalleeType->isFunctionPointerType()) {
S.Diag(AL.getLoc(), diag::err_callback_callee_no_function_type)
<< AL.getRange();
return;
}
const Type *CalleeFnType =
CalleeType->getPointeeType()->getUnqualifiedDesugaredType();
// TODO: Check the type of the callee arguments.
const auto *CalleeFnProtoType = dyn_cast<FunctionProtoType>(CalleeFnType);
if (!CalleeFnProtoType) {
S.Diag(AL.getLoc(), diag::err_callback_callee_no_function_type)
<< AL.getRange();
return;
}
if (CalleeFnProtoType->getNumParams() > EncodingIndices.size() - 1) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments)
<< AL << (unsigned)(EncodingIndices.size() - 1);
return;
}
if (CalleeFnProtoType->getNumParams() < EncodingIndices.size() - 1) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments)
<< AL << (unsigned)(EncodingIndices.size() - 1);
return;
}
if (CalleeFnProtoType->isVariadic()) {
S.Diag(AL.getLoc(), diag::err_callback_callee_is_variadic) << AL.getRange();
return;
}
// Do not allow multiple callback attributes.
if (D->hasAttr<CallbackAttr>()) {
S.Diag(AL.getLoc(), diag::err_callback_attribute_multiple) << AL.getRange();
return;
}
D->addAttr(::new (S.Context) CallbackAttr(
AL.getRange(), S.Context, EncodingIndices.data(), EncodingIndices.size(),
AL.getAttributeSpellingListIndex()));
}
static void handleTransparentUnionAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// Try to find the underlying union declaration.
RecordDecl *RD = nullptr;
const auto *TD = dyn_cast<TypedefNameDecl>(D);
if (TD && TD->getUnderlyingType()->isUnionType())
RD = TD->getUnderlyingType()->getAsUnionType()->getDecl();
else
RD = dyn_cast<RecordDecl>(D);
if (!RD || !RD->isUnion()) {
S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type) << AL
<< ExpectedUnion;
return;
}
if (!RD->isCompleteDefinition()) {
if (!RD->isBeingDefined())
S.Diag(AL.getLoc(),
diag::warn_transparent_union_attribute_not_definition);
return;
}
RecordDecl::field_iterator Field = RD->field_begin(),
FieldEnd = RD->field_end();
if (Field == FieldEnd) {
S.Diag(AL.getLoc(), diag::warn_transparent_union_attribute_zero_fields);
return;
}
FieldDecl *FirstField = *Field;
QualType FirstType = FirstField->getType();
if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) {
S.Diag(FirstField->getLocation(),
diag::warn_transparent_union_attribute_floating)
<< FirstType->isVectorType() << FirstType;
return;
}
if (FirstType->isIncompleteType())
return;
uint64_t FirstSize = S.Context.getTypeSize(FirstType);
uint64_t FirstAlign = S.Context.getTypeAlign(FirstType);
for (; Field != FieldEnd; ++Field) {
QualType FieldType = Field->getType();
if (FieldType->isIncompleteType())
return;
// FIXME: this isn't fully correct; we also need to test whether the
// members of the union would all have the same calling convention as the
// first member of the union. Checking just the size and alignment isn't
// sufficient (consider structs passed on the stack instead of in registers
// as an example).
if (S.Context.getTypeSize(FieldType) != FirstSize ||
S.Context.getTypeAlign(FieldType) > FirstAlign) {
// Warn if we drop the attribute.
bool isSize = S.Context.getTypeSize(FieldType) != FirstSize;
unsigned FieldBits = isSize? S.Context.getTypeSize(FieldType)
: S.Context.getTypeAlign(FieldType);
S.Diag(Field->getLocation(),
diag::warn_transparent_union_attribute_field_size_align)
<< isSize << Field->getDeclName() << FieldBits;
unsigned FirstBits = isSize? FirstSize : FirstAlign;
S.Diag(FirstField->getLocation(),
diag::note_transparent_union_first_field_size_align)
<< isSize << FirstBits;
return;
}
}
RD->addAttr(::new (S.Context)
TransparentUnionAttr(AL.getRange(), S.Context,
AL.getAttributeSpellingListIndex()));
}
static void handleAnnotateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// Make sure that there is a string literal as the annotation's single
// argument.
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(AL, 0, Str))
return;
// Don't duplicate annotations that are already set.
for (const auto *I : D->specific_attrs<AnnotateAttr>()) {
if (I->getAnnotation() == Str)
return;
}
D->addAttr(::new (S.Context)
AnnotateAttr(AL.getRange(), S.Context, Str,
AL.getAttributeSpellingListIndex()));
}
static void handleAlignValueAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
S.AddAlignValueAttr(AL.getRange(), D, AL.getArgAsExpr(0),
AL.getAttributeSpellingListIndex());
}
void Sema::AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
unsigned SpellingListIndex) {
AlignValueAttr TmpAttr(AttrRange, Context, E, SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();
QualType T;
if (const auto *TD = dyn_cast<TypedefNameDecl>(D))
T = TD->getUnderlyingType();
else if (const auto *VD = dyn_cast<ValueDecl>(D))
T = VD->getType();
else
llvm_unreachable("Unknown decl type for align_value");
if (!T->isDependentType() && !T->isAnyPointerType() &&
!T->isReferenceType() && !T->isMemberPointerType()) {
Diag(AttrLoc, diag::warn_attribute_pointer_or_reference_only)
<< &TmpAttr /*TmpAttr.getName()*/ << T << D->getSourceRange();
return;
}
if (!E->isValueDependent()) {
llvm::APSInt Alignment;
ExprResult ICE
= VerifyIntegerConstantExpression(E, &Alignment,
diag::err_align_value_attribute_argument_not_int,
/*AllowFold*/ false);
if (ICE.isInvalid())
return;
if (!Alignment.isPowerOf2()) {
Diag(AttrLoc, diag::err_alignment_not_power_of_two)
<< E->getSourceRange();
return;
}
D->addAttr(::new (Context)
AlignValueAttr(AttrRange, Context, ICE.get(),
SpellingListIndex));
return;
}
// Save dependent expressions in the AST to be instantiated.
D->addAttr(::new (Context) AlignValueAttr(TmpAttr));
}
static void handleAlignedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// check the attribute arguments.
if (AL.getNumArgs() > 1) {
S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
return;
}
if (AL.getNumArgs() == 0) {
D->addAttr(::new (S.Context) AlignedAttr(AL.getRange(), S.Context,
true, nullptr, AL.getAttributeSpellingListIndex()));
return;
}
Expr *E = AL.getArgAsExpr(0);
if (AL.isPackExpansion() && !E->containsUnexpandedParameterPack()) {
S.Diag(AL.getEllipsisLoc(),
diag::err_pack_expansion_without_parameter_packs);
return;
}
if (!AL.isPackExpansion() && S.DiagnoseUnexpandedParameterPack(E))
return;
S.AddAlignedAttr(AL.getRange(), D, E, AL.getAttributeSpellingListIndex(),
AL.isPackExpansion());
}
void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
unsigned SpellingListIndex, bool IsPackExpansion) {
AlignedAttr TmpAttr(AttrRange, Context, true, E, SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();
// C++11 alignas(...) and C11 _Alignas(...) have additional requirements.
if (TmpAttr.isAlignas()) {
// C++11 [dcl.align]p1:
// An alignment-specifier may be applied to a variable or to a class
// data member, but it shall not be applied to a bit-field, a function
// parameter, the formal parameter of a catch clause, or a variable
// declared with the register storage class specifier. An
// alignment-specifier may also be applied to the declaration of a class
// or enumeration type.
// C11 6.7.5/2:
// An alignment attribute shall not be specified in a declaration of
// a typedef, or a bit-field, or a function, or a parameter, or an
// object declared with the register storage-class specifier.
int DiagKind = -1;
if (isa<ParmVarDecl>(D)) {
DiagKind = 0;
} else if (const auto *VD = dyn_cast<VarDecl>(D)) {
if (VD->getStorageClass() == SC_Register)
DiagKind = 1;
if (VD->isExceptionVariable())
DiagKind = 2;
} else if (const auto *FD = dyn_cast<FieldDecl>(D)) {
if (FD->isBitField())
DiagKind = 3;
} else if (!isa<TagDecl>(D)) {
Diag(AttrLoc, diag::err_attribute_wrong_decl_type) << &TmpAttr
<< (TmpAttr.isC11() ? ExpectedVariableOrField
: ExpectedVariableFieldOrTag);
return;
}
if (DiagKind != -1) {
Diag(AttrLoc, diag::err_alignas_attribute_wrong_decl_type)
<< &TmpAttr << DiagKind;
return;
}
}
if (E->isValueDependent()) {
// We can't support a dependent alignment on a non-dependent type,
// because we have no way to model that a type is "alignment-dependent"
// but not dependent in any other way.
if (const auto *TND = dyn_cast<TypedefNameDecl>(D)) {
if (!TND->getUnderlyingType()->isDependentType()) {
Diag(AttrLoc, diag::err_alignment_dependent_typedef_name)
<< E->getSourceRange();
return;
}
}
// Save dependent expressions in the AST to be instantiated.
AlignedAttr *AA = ::new (Context) AlignedAttr(TmpAttr);
AA->setPackExpansion(IsPackExpansion);
D->addAttr(AA);
return;
}
// FIXME: Cache the number on the AL object?
llvm::APSInt Alignment;
ExprResult ICE
= VerifyIntegerConstantExpression(E, &Alignment,
diag::err_aligned_attribute_argument_not_int,
/*AllowFold*/ false);
if (ICE.isInvalid())
return;
uint64_t AlignVal = Alignment.getZExtValue();
// C++11 [dcl.align]p2:
// -- if the constant expression evaluates to zero, the alignment
// specifier shall have no effect
// C11 6.7.5p6:
// An alignment specification of zero has no effect.
if (!(TmpAttr.isAlignas() && !Alignment)) {
if (!llvm::isPowerOf2_64(AlignVal)) {
Diag(AttrLoc, diag::err_alignment_not_power_of_two)
<< E->getSourceRange();
return;
}
}
// Alignment calculations can wrap around if it's greater than 2**28.
unsigned MaxValidAlignment =
Context.getTargetInfo().getTriple().isOSBinFormatCOFF() ? 8192
: 268435456;
if (AlignVal > MaxValidAlignment) {
Diag(AttrLoc, diag::err_attribute_aligned_too_great) << MaxValidAlignment
<< E->getSourceRange();
return;
}