[clang] [WIP] Turn 'counted_by' into a type attribute and parse it into 'CountAttributedType' (PR #78000)
Yeoul Na via cfe-commits
cfe-commits at lists.llvm.org
Fri Jan 12 16:10:21 PST 2024
https://github.com/rapidsna created https://github.com/llvm/llvm-project/pull/78000
In `-fbounds-safety`, bounds annotations are considered type attributes rather than declaration attributes. Constructing them as type attributes allows us to extend the attribute to apply nested pointers, which is essential to annotate functions that involve out parameters: `void foo(int *__counted_by(*out_count) *out_buf, int *out_count)`.
We introduce a new sugar type to support bounds annotated types, `CountAttributedType`. In order to maintain extra data (the bounds expression and the dependent declaration information) that is not trackable in `AttributedType` we create a new type dedicate to this functionality.
This patch also extends the parsing logic to parse the `counted_by` argument as an expression, which will allow us to extend the model to support arguments beyond an identifier, e.g., `__counted_by(n + m)` in the future as specified by `-fbounds-safety`.
This also adjusts `__bdos` and array-bounds sanitizer code that already uses `CountedByAttr` to check `CountAttributedType` instead to get the field referred to by the attribute.
>From 1a17c254ddf09cd4faf5217b2f72da3f44622f8a Mon Sep 17 00:00:00 2001
From: Yeoul Na <yeoul_na at apple.com>
Date: Mon, 18 Dec 2023 10:58:16 +0900
Subject: [PATCH 1/2] [BoundsSafety] Introduce CountAttributedType
CountAttributedType is a sugar type to represent a type with
a 'counted_by' attribute and the likes, which provides bounds
information to the underlying type. The type contains an
the argument of attribute as an expression. Additionally, the type
holds metadata about declarations referenced by the expression in
order to make it easier for Sema to access declarations on which
the type depends.
---
clang/include/clang/AST/ASTContext.h | 7 +
clang/include/clang/AST/PropertiesBase.td | 1 +
clang/include/clang/AST/RecursiveASTVisitor.h | 9 ++
clang/include/clang/AST/Type.h | 152 ++++++++++++++++++
clang/include/clang/AST/TypeLoc.h | 26 +++
clang/include/clang/AST/TypeProperties.td | 19 +++
clang/include/clang/Basic/TypeNodes.td | 2 +
.../clang/Serialization/ASTRecordReader.h | 2 +
.../clang/Serialization/ASTRecordWriter.h | 5 +
.../clang/Serialization/TypeBitCodes.def | 1 +
clang/lib/AST/ASTContext.cpp | 56 +++++++
clang/lib/AST/ASTImporter.cpp | 12 ++
clang/lib/AST/ASTStructuralEquivalence.cpp | 7 +
clang/lib/AST/ItaniumMangle.cpp | 1 +
clang/lib/AST/Type.cpp | 57 +++++++
clang/lib/AST/TypeLoc.cpp | 4 +
clang/lib/AST/TypePrinter.cpp | 23 +++
clang/lib/CodeGen/CGDebugInfo.cpp | 1 +
clang/lib/CodeGen/CodeGenFunction.cpp | 1 +
clang/lib/Sema/SemaExpr.cpp | 1 +
clang/lib/Sema/TreeTransform.h | 7 +
clang/lib/Serialization/ASTReader.cpp | 8 +
clang/lib/Serialization/ASTWriter.cpp | 4 +
clang/tools/libclang/CIndex.cpp | 4 +
24 files changed, 410 insertions(+)
diff --git a/clang/include/clang/AST/ASTContext.h b/clang/include/clang/AST/ASTContext.h
index 3e46a5da3fc043..c8354fbb108a27 100644
--- a/clang/include/clang/AST/ASTContext.h
+++ b/clang/include/clang/AST/ASTContext.h
@@ -247,6 +247,8 @@ class ASTContext : public RefCountedBase<ASTContext> {
DependentBitIntTypes;
llvm::FoldingSet<BTFTagAttributedType> BTFTagAttributedTypes;
+ mutable llvm::FoldingSet<CountAttributedType> CountAttributedTypes;
+
mutable llvm::FoldingSet<QualifiedTemplateName> QualifiedTemplateNames;
mutable llvm::FoldingSet<DependentTemplateName> DependentTemplateNames;
mutable llvm::FoldingSet<SubstTemplateTemplateParmStorage>
@@ -1338,6 +1340,11 @@ class ASTContext : public RefCountedBase<ASTContext> {
return CanQualType::CreateUnsafe(getPointerType((QualType) T));
}
+ QualType
+ getCountAttributedType(QualType T, Expr *CountExpr, bool CountInBytes,
+ bool OrNull,
+ ArrayRef<TypeCoupledDeclRefInfo> DependentDecls) const;
+
/// Return the uniqued reference to a type adjusted from the original
/// type to a new type.
QualType getAdjustedType(QualType Orig, QualType New) const;
diff --git a/clang/include/clang/AST/PropertiesBase.td b/clang/include/clang/AST/PropertiesBase.td
index d86c4eba6a2251..25ddfd105ab877 100644
--- a/clang/include/clang/AST/PropertiesBase.td
+++ b/clang/include/clang/AST/PropertiesBase.td
@@ -143,6 +143,7 @@ def UInt32 : CountPropertyType<"uint32_t">;
def UInt64 : CountPropertyType<"uint64_t">;
def UnaryTypeTransformKind : EnumPropertyType<"UnaryTransformType::UTTKind">;
def VectorKind : EnumPropertyType<"VectorKind">;
+def TypeCoupledDeclRefInfo : PropertyType;
def ExceptionSpecInfo : PropertyType<"FunctionProtoType::ExceptionSpecInfo"> {
let BufferElementTypes = [ QualType ];
diff --git a/clang/include/clang/AST/RecursiveASTVisitor.h b/clang/include/clang/AST/RecursiveASTVisitor.h
index 8f2714e142bbe3..b57ab36939d07c 100644
--- a/clang/include/clang/AST/RecursiveASTVisitor.h
+++ b/clang/include/clang/AST/RecursiveASTVisitor.h
@@ -1099,6 +1099,12 @@ DEF_TRAVERSE_TYPE(InjectedClassNameType, {})
DEF_TRAVERSE_TYPE(AttributedType,
{ TRY_TO(TraverseType(T->getModifiedType())); })
+DEF_TRAVERSE_TYPE(CountAttributedType, {
+ if (T->getCountExpr())
+ TRY_TO(TraverseStmt(T->getCountExpr()));
+ TRY_TO(TraverseType(T->desugar()));
+})
+
DEF_TRAVERSE_TYPE(BTFTagAttributedType,
{ TRY_TO(TraverseType(T->getWrappedType())); })
@@ -1385,6 +1391,9 @@ DEF_TRAVERSE_TYPELOC(MacroQualifiedType,
DEF_TRAVERSE_TYPELOC(AttributedType,
{ TRY_TO(TraverseTypeLoc(TL.getModifiedLoc())); })
+DEF_TRAVERSE_TYPELOC(CountAttributedType,
+ { TRY_TO(TraverseTypeLoc(TL.getInnerLoc())); })
+
DEF_TRAVERSE_TYPELOC(BTFTagAttributedType,
{ TRY_TO(TraverseTypeLoc(TL.getWrappedLoc())); })
diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
index d4e5310fb3abc6..489644ca5acf86 100644
--- a/clang/include/clang/AST/Type.h
+++ b/clang/include/clang/AST/Type.h
@@ -61,6 +61,7 @@ class BTFTypeTagAttr;
class ExtQuals;
class QualType;
class ConceptDecl;
+class ValueDecl;
class TagDecl;
class TemplateParameterList;
class Type;
@@ -2000,6 +2001,21 @@ class alignas(TypeAlignment) Type : public ExtQualsTypeCommonBase {
unsigned NumExpansions;
};
+ class CountAttributedTypeBitfields {
+ friend class CountAttributedType;
+
+ LLVM_PREFERRED_TYPE(TypeBitfields)
+ unsigned : NumTypeBits;
+
+ /// The limit is 15.
+ static constexpr unsigned NumCoupledDeclsBits = 4;
+ unsigned NumCoupledDecls : NumCoupledDeclsBits;
+ LLVM_PREFERRED_TYPE(bool)
+ unsigned CountInBytes : 1;
+ LLVM_PREFERRED_TYPE(bool)
+ unsigned OrNull : 1;
+ };
+
union {
TypeBitfields TypeBits;
ArrayTypeBitfields ArrayTypeBits;
@@ -2022,6 +2038,7 @@ class alignas(TypeAlignment) Type : public ExtQualsTypeCommonBase {
DependentTemplateSpecializationTypeBitfields
DependentTemplateSpecializationTypeBits;
PackExpansionTypeBitfields PackExpansionTypeBits;
+ CountAttributedTypeBitfields CountAttributedTypeBits;
};
private:
@@ -2719,6 +2736,14 @@ template <> const TemplateSpecializationType *Type::getAs() const;
/// until it reaches an AttributedType or a non-sugared type.
template <> const AttributedType *Type::getAs() const;
+/// This will check for a BoundsAttributedType by removing any existing
+/// sugar until it reaches an BoundsAttributedType or a non-sugared type.
+template <> const BoundsAttributedType *Type::getAs() const;
+
+/// This will check for a CountAttributedType by removing any existing
+/// sugar until it reaches an CountAttributedType or a non-sugared type.
+template <> const CountAttributedType *Type::getAs() const;
+
// We can do canonical leaf types faster, because we don't have to
// worry about preserving child type decoration.
#define TYPE(Class, Base)
@@ -2917,6 +2942,133 @@ class PointerType : public Type, public llvm::FoldingSetNode {
static bool classof(const Type *T) { return T->getTypeClass() == Pointer; }
};
+/// [BoundsSafety] Represents information of declarations referenced by the
+/// arguments of the `counted_by` attribute and the likes.
+class TypeCoupledDeclRefInfo {
+public:
+ using BaseTy = llvm::PointerIntPair<ValueDecl *, 1, unsigned>;
+
+private:
+ enum {
+ DerefShift = 0,
+ DerefMask = 1,
+ };
+ BaseTy Data;
+
+public:
+ /// \p D is to a declaration referenced by the argument of attribute. \p Deref
+ /// indicates whether \p D is referenced as a dereferenced form, e.g., \p
+ /// Deref is true for `*n` in `int *__counted_by(*n)`.
+ TypeCoupledDeclRefInfo(ValueDecl *D = nullptr, bool Deref = false);
+
+ bool isDeref() const;
+ ValueDecl *getDecl() const;
+ unsigned getInt() const;
+ void *getOpaqueValue() const;
+ bool operator==(const TypeCoupledDeclRefInfo &Other) const;
+ void setFromOpaqueValue(void *V);
+};
+
+/// [BoundsSafety] Represents a parent type class for CountAttributedType and
+/// similar sugar types that will be introduced to represent a type with a
+/// bounds attribute.
+///
+/// Provides a common interface to navigate declarations referred to by the
+/// bounds expression.
+
+class BoundsAttributedType : public Type, public llvm::FoldingSetNode {
+ QualType WrappedTy;
+
+protected:
+ ArrayRef<TypeCoupledDeclRefInfo> Decls; // stored in trailing objects
+
+ BoundsAttributedType(TypeClass TC, QualType Wrapped, QualType Canon);
+
+public:
+ bool isSugared() const { return true; }
+ QualType desugar() const { return WrappedTy; }
+
+ using decl_iterator = const TypeCoupledDeclRefInfo *;
+ using decl_range = llvm::iterator_range<decl_iterator>;
+
+ decl_iterator dependent_decl_begin() const { return Decls.begin(); }
+ decl_iterator dependent_decl_end() const { return Decls.end(); }
+
+ unsigned getNumCoupledDecls() const { return Decls.size(); }
+
+ decl_range dependent_decls() const {
+ return decl_range(dependent_decl_begin(), dependent_decl_end());
+ }
+
+ ArrayRef<TypeCoupledDeclRefInfo> getCoupledDecls() const {
+ return {dependent_decl_begin(), dependent_decl_end()};
+ }
+
+ bool referencesFieldDecls() const;
+
+ static bool classof(const Type *T) {
+ switch (T->getTypeClass()) {
+ case CountAttributed:
+ return true;
+ default:
+ return false;
+ }
+ }
+};
+
+/// Represents a sugar type with `__counted_by` or `__sized_by` annotations,
+/// including their `_or_null` variants.
+class CountAttributedType final
+ : public BoundsAttributedType,
+ public llvm::TrailingObjects<CountAttributedType,
+ TypeCoupledDeclRefInfo> {
+ friend class ASTContext;
+
+ Expr *CountExpr;
+ /// \p CountExpr represents the argument of __counted_by or the likes. \p
+ /// CountInBytes indicates that \p CountExpr is a byte count (i.e.,
+ /// __sized_by(_or_null)) \p OrNull means it's an or_null variant (i.e.,
+ /// __counted_by_or_null or __sized_by_or_null) \p CoupledDecls contains the
+ /// list of declarations referenced by \p CountExpr, which the type depends on
+ /// for the bounds information.
+ CountAttributedType(QualType Wrapped, QualType Canon, Expr *CountExpr,
+ bool CountInBytes, bool OrNull,
+ ArrayRef<TypeCoupledDeclRefInfo> CoupledDecls);
+
+ unsigned numTrailingObjects(OverloadToken<TypeCoupledDeclRefInfo>) const {
+ return CountAttributedTypeBits.NumCoupledDecls;
+ }
+
+public:
+ enum DynamicCountPointerKind {
+ CountedBy = 0,
+ SizedBy,
+ CountedByOrNull,
+ SizedByOrNull,
+ };
+
+ Expr *getCountExpr() const { return CountExpr; }
+ bool isCountInBytes() const { return CountAttributedTypeBits.CountInBytes; }
+ bool isOrNull() const { return CountAttributedTypeBits.OrNull; }
+
+ DynamicCountPointerKind getKind() const {
+ if (isOrNull())
+ return isCountInBytes() ? SizedByOrNull : CountedByOrNull;
+ return isCountInBytes() ? SizedBy : CountedBy;
+ }
+
+ void Profile(llvm::FoldingSetNodeID &ID) {
+ Profile(ID, desugar(), CountExpr, isCountInBytes(), isOrNull());
+ }
+
+ static void Profile(llvm::FoldingSetNodeID &ID, QualType WrappedTy,
+ Expr *CountExpr, bool CountInBytes, bool Nullable);
+
+ static bool classof(const Type *T) {
+ return T->getTypeClass() == CountAttributed;
+ }
+};
+
/// Represents a type which was implicitly adjusted by the semantic
/// engine for arbitrary reasons. For example, array and function types can
/// decay, and function types can have their calling conventions adjusted.
diff --git a/clang/include/clang/AST/TypeLoc.h b/clang/include/clang/AST/TypeLoc.h
index 471deb14aba51f..fa3cd46ffd3fc0 100644
--- a/clang/include/clang/AST/TypeLoc.h
+++ b/clang/include/clang/AST/TypeLoc.h
@@ -1110,6 +1110,32 @@ class ObjCInterfaceTypeLoc : public ConcreteTypeLoc<ObjCObjectTypeLoc,
}
};
+struct BoundsAttributedLocInfo {};
+class BoundsAttributedTypeLoc
+ : public ConcreteTypeLoc<UnqualTypeLoc, BoundsAttributedTypeLoc,
+ BoundsAttributedType, BoundsAttributedLocInfo> {
+public:
+ TypeLoc getInnerLoc() const { return this->getInnerTypeLoc(); }
+ QualType getInnerType() const { return this->getTypePtr()->desugar(); }
+ void initializeLocal(ASTContext &Context, SourceLocation Loc) {
+ // nothing to do
+ }
+ unsigned getLocalDataAlignment() const { return 1; }
+ unsigned getLocalDataSize() const { return 0; }
+};
+
+class CountAttributedTypeLoc final
+ : public InheritingConcreteTypeLoc<BoundsAttributedTypeLoc,
+ CountAttributedTypeLoc,
+ CountAttributedType> {
+public:
+ Expr *getCountExpr() const { return getTypePtr()->getCountExpr(); }
+ bool isCountInBytes() const { return getTypePtr()->isCountInBytes(); }
+ bool isOrNull() const { return getTypePtr()->isOrNull(); }
+
+ SourceRange getLocalSourceRange() const;
+};
+
struct MacroQualifiedLocInfo {
SourceLocation ExpansionLoc;
};
diff --git a/clang/include/clang/AST/TypeProperties.td b/clang/include/clang/AST/TypeProperties.td
index 682c869b0c5847..8697903d8d7f6e 100644
--- a/clang/include/clang/AST/TypeProperties.td
+++ b/clang/include/clang/AST/TypeProperties.td
@@ -25,6 +25,25 @@ let Class = PointerType in {
def : Creator<[{ return ctx.getPointerType(pointeeType); }]>;
}
+let Class = CountAttributedType in {
+ def : Property<"WrappedTy", QualType> {
+ let Read = [{ node->desugar() }];
+ }
+ def : Property<"CountExpr", ExprRef> {
+ let Read = [{ node->getCountExpr() }];
+ }
+ def : Property<"CountInBytes", Bool> {
+ let Read = [{ node->isCountInBytes() }];
+ }
+ def : Property<"OrNull", Bool> {
+ let Read = [{ node->isOrNull() }];
+ }
+ def : Property<"CoupledDecls", Array<TypeCoupledDeclRefInfo>> {
+ let Read = [{ node->getCoupledDecls() }];
+ }
+ def : Creator<[{ return ctx.getCountAttributedType(WrappedTy, CountExpr, CountInBytes, OrNull, CoupledDecls); }]>;
+}
+
let Class = AdjustedType in {
def : Property<"originalType", QualType> {
let Read = [{ node->getOriginalType() }];
diff --git a/clang/include/clang/Basic/TypeNodes.td b/clang/include/clang/Basic/TypeNodes.td
index 649b071cebb940..da733716fa1f66 100644
--- a/clang/include/clang/Basic/TypeNodes.td
+++ b/clang/include/clang/Basic/TypeNodes.td
@@ -107,6 +107,8 @@ def ObjCTypeParamType : TypeNode<Type>, NeverCanonical;
def ObjCObjectType : TypeNode<Type>;
def ObjCInterfaceType : TypeNode<ObjCObjectType>, LeafType;
def ObjCObjectPointerType : TypeNode<Type>;
+def BoundsAttributedType : TypeNode<Type, 1>;
+def CountAttributedType : TypeNode<BoundsAttributedType>, NeverCanonical;
def PipeType : TypeNode<Type>;
def AtomicType : TypeNode<Type>;
def BitIntType : TypeNode<Type>;
diff --git a/clang/include/clang/Serialization/ASTRecordReader.h b/clang/include/clang/Serialization/ASTRecordReader.h
index 80a1359fd16aa0..5d3e95cb5d630f 100644
--- a/clang/include/clang/Serialization/ASTRecordReader.h
+++ b/clang/include/clang/Serialization/ASTRecordReader.h
@@ -221,6 +221,8 @@ class ASTRecordReader
return Reader->ReadSelector(*F, Record, Idx);
}
+ TypeCoupledDeclRefInfo readTypeCoupledDeclRefInfo();
+
/// Read a declaration name, advancing Idx.
// DeclarationName readDeclarationName(); (inherited)
DeclarationNameLoc readDeclarationNameLoc(DeclarationName Name);
diff --git a/clang/include/clang/Serialization/ASTRecordWriter.h b/clang/include/clang/Serialization/ASTRecordWriter.h
index 9a64735c9fa55d..e007d4a70843a1 100644
--- a/clang/include/clang/Serialization/ASTRecordWriter.h
+++ b/clang/include/clang/Serialization/ASTRecordWriter.h
@@ -141,6 +141,11 @@ class ASTRecordWriter
AddSourceLocation(Loc);
}
+ void writeTypeCoupledDeclRefInfo(TypeCoupledDeclRefInfo Info) {
+ writeDeclRef(Info.getDecl());
+ writeBool(Info.isDeref());
+ }
+
/// Emit a source range.
void AddSourceRange(SourceRange Range, LocSeq *Seq = nullptr) {
return Writer->AddSourceRange(Range, *Record, Seq);
diff --git a/clang/include/clang/Serialization/TypeBitCodes.def b/clang/include/clang/Serialization/TypeBitCodes.def
index 89ae1a2fa39546..c04dacdaa15820 100644
--- a/clang/include/clang/Serialization/TypeBitCodes.def
+++ b/clang/include/clang/Serialization/TypeBitCodes.def
@@ -64,5 +64,6 @@ TYPE_BIT_CODE(ConstantMatrix, CONSTANT_MATRIX, 52)
TYPE_BIT_CODE(DependentSizedMatrix, DEPENDENT_SIZE_MATRIX, 53)
TYPE_BIT_CODE(Using, USING, 54)
TYPE_BIT_CODE(BTFTagAttributed, BTFTAG_ATTRIBUTED, 55)
+TYPE_BIT_CODE(CountAttributed, COUNT_ATTRIBUTED, 56)
#undef TYPE_BIT_CODE
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index d9cefcaa84d7e5..43d2da0e60f367 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -2341,6 +2341,9 @@ TypeInfo ASTContext::getTypeInfoImpl(const Type *T) const {
return getTypeInfo(
cast<AttributedType>(T)->getEquivalentType().getTypePtr());
+ case Type::CountAttributed:
+ return getTypeInfo(cast<CountAttributedType>(T)->desugar().getTypePtr());
+
case Type::BTFTagAttributed:
return getTypeInfo(
cast<BTFTagAttributedType>(T)->getWrappedType().getTypePtr());
@@ -3106,6 +3109,33 @@ QualType ASTContext::removePtrSizeAddrSpace(QualType T) const {
return T;
}
+QualType ASTContext::getCountAttributedType(
+ QualType WrappedTy, Expr *CountExpr, bool CountInBytes, bool OrNull,
+ ArrayRef<TypeCoupledDeclRefInfo> DependentDecls) const {
+ assert(WrappedTy->isPointerType() || WrappedTy->isArrayType());
+ assert(CountExpr->isPRValue());
+
+ llvm::FoldingSetNodeID ID;
+ CountAttributedType::Profile(ID, WrappedTy, CountExpr, CountInBytes, OrNull);
+
+ void *InsertPos = nullptr;
+ CountAttributedType *CATy =
+ CountAttributedTypes.FindNodeOrInsertPos(ID, InsertPos);
+ if (CATy)
+ return QualType(CATy, 0);
+
+ QualType CanonTy = getCanonicalType(WrappedTy);
+ size_t Size = CountAttributedType::totalSizeToAlloc<TypeCoupledDeclRefInfo>(
+ DependentDecls.size());
+ CATy = (CountAttributedType *)Allocate(Size, TypeAlignment);
+ new (CATy) CountAttributedType(WrappedTy, CanonTy, CountExpr, CountInBytes,
+ OrNull, DependentDecls);
+ Types.push_back(CATy);
+ CountAttributedTypes.InsertNode(CATy, InsertPos);
+
+ return QualType(CATy, 0);
+}
+
const FunctionType *ASTContext::adjustFunctionType(const FunctionType *T,
FunctionType::ExtInfo Info) {
if (T->getExtInfo() == Info)
@@ -13158,6 +13188,32 @@ static QualType getCommonSugarTypeNode(ASTContext &Ctx, const Type *X,
return QualType();
return Ctx.getUsingType(CD, Ctx.getQualifiedType(Underlying));
}
+ case Type::CountAttributed: {
+ const auto *DX = cast<CountAttributedType>(X),
+ *DY = cast<CountAttributedType>(Y);
+ if (DX->isCountInBytes() != DY->isCountInBytes())
+ return QualType();
+ if (DX->isOrNull() != DY->isOrNull())
+ return QualType();
+ const auto CEX = DX->getCountExpr();
+ const auto CEY = DY->getCountExpr();
+ const auto CDX = DX->getCoupledDecls();
+ if (Ctx.hasSameExpr(CEX, CEY))
+ return Ctx.getCountAttributedType(Ctx.getQualifiedType(Underlying), CEX,
+ DX->isCountInBytes(), DX->isOrNull(),
+ CDX);
+ if (!CEX->isIntegerConstantExpr(Ctx) || !CEY->isIntegerConstantExpr(Ctx))
+ return QualType();
+ // Two declarations with the same integer constant may still differ in their
+ // expression pointers, so we need to evaluate them.
+ const auto VX = CEX->getIntegerConstantExpr(Ctx);
+ const auto VY = CEY->getIntegerConstantExpr(Ctx);
+ if (*VX != *VY)
+ return QualType();
+ return Ctx.getCountAttributedType(Ctx.getQualifiedType(Underlying), CEX,
+ DX->isCountInBytes(), DX->isOrNull(),
+ CDX);
+ }
}
llvm_unreachable("Unhandled Type Class");
}
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index b762d6a4cd3800..6bad0b701cea1a 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -1504,6 +1504,18 @@ ExpectedType ASTNodeImporter::VisitAttributedType(const AttributedType *T) {
*ToModifiedTypeOrErr, *ToEquivalentTypeOrErr);
}
+ExpectedType
+ASTNodeImporter::VisitCountAttributedType(const CountAttributedType *T) {
+ ExpectedType ToWrappedTypeOrErr = import(T->desugar());
+ if (!ToWrappedTypeOrErr)
+ return ToWrappedTypeOrErr.takeError();
+
+ // FIXME: Handle CoupledDecls correctly
+ return Importer.getToContext().getCountAttributedType(
+ *ToWrappedTypeOrErr, T->getCountExpr(), T->isCountInBytes(),
+ T->isOrNull(), T->getCoupledDecls());
+}
+
ExpectedType ASTNodeImporter::VisitTemplateTypeParmType(
const TemplateTypeParmType *T) {
Expected<TemplateTypeParmDecl *> ToDeclOrErr = import(T->getDecl());
diff --git a/clang/lib/AST/ASTStructuralEquivalence.cpp b/clang/lib/AST/ASTStructuralEquivalence.cpp
index a9e0d1698a9178..c0e731af0ac88e 100644
--- a/clang/lib/AST/ASTStructuralEquivalence.cpp
+++ b/clang/lib/AST/ASTStructuralEquivalence.cpp
@@ -1008,6 +1008,13 @@ static bool IsStructurallyEquivalent(StructuralEquivalenceContext &Context,
return false;
break;
+ case Type::CountAttributed:
+ if (!IsStructurallyEquivalent(Context,
+ cast<CountAttributedType>(T1)->desugar(),
+ cast<CountAttributedType>(T2)->desugar()))
+ return false;
+ break;
+
case Type::BTFTagAttributed:
if (!IsStructurallyEquivalent(
Context, cast<BTFTagAttributedType>(T1)->getWrappedType(),
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index b1678479888eb7..d2464d9121f1ae 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -2431,6 +2431,7 @@ bool CXXNameMangler::mangleUnresolvedTypeOrSimpleId(QualType Ty,
case Type::MacroQualified:
case Type::BitInt:
case Type::DependentBitInt:
+ case Type::CountAttributed:
llvm_unreachable("type is illegal as a nested name specifier");
case Type::SubstTemplateTypeParmPack:
diff --git a/clang/lib/AST/Type.cpp b/clang/lib/AST/Type.cpp
index b419fc8836b032..3c11b4be125594 100644
--- a/clang/lib/AST/Type.cpp
+++ b/clang/lib/AST/Type.cpp
@@ -385,6 +385,26 @@ void DependentBitIntType::Profile(llvm::FoldingSetNodeID &ID,
NumBitsExpr->Profile(ID, Context, true);
}
+bool BoundsAttributedType::referencesFieldDecls() const {
+ for (const auto &Decl : dependent_decls())
+ if (isa<FieldDecl>(Decl.getDecl()))
+ return true;
+ return false;
+}
+
+void CountAttributedType::Profile(llvm::FoldingSetNodeID &ID,
+ QualType WrappedTy, Expr *CountExpr,
+ bool CountInBytes, bool OrNull) {
+ ID.AddPointer(WrappedTy.getAsOpaquePtr());
+ ID.AddBoolean(CountInBytes);
+ ID.AddBoolean(OrNull);
+ // We profile it as a pointer as the StmtProfiler considers parameter
+ // expressions on function declaration and function definition as the
+ // same, resulting in count expression being evaluated with ParamDecl
+ // not in the function scope.
+ ID.AddPointer(CountExpr);
+}
+
/// getArrayElementTypeNoTypeQual - If this is an array type, return the
/// element type of the array, potentially with type qualifiers missing.
/// This method should never be used when type qualifiers are meaningful.
@@ -3685,6 +3705,43 @@ void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID,
getExtProtoInfo(), Ctx, isCanonicalUnqualified());
}
+TypeCoupledDeclRefInfo::TypeCoupledDeclRefInfo(ValueDecl *D, bool Deref)
+ : Data(D, Deref << DerefShift) {}
+
+bool TypeCoupledDeclRefInfo::isDeref() const {
+ return Data.getInt() & DerefMask;
+}
+ValueDecl *TypeCoupledDeclRefInfo::getDecl() const { return Data.getPointer(); }
+unsigned TypeCoupledDeclRefInfo::getInt() const { return Data.getInt(); }
+void *TypeCoupledDeclRefInfo::getOpaqueValue() const {
+ return Data.getOpaqueValue();
+}
+bool TypeCoupledDeclRefInfo::operator==(
+ const TypeCoupledDeclRefInfo &Other) const {
+ return getOpaqueValue() == Other.getOpaqueValue();
+}
+void TypeCoupledDeclRefInfo::setFromOpaqueValue(void *V) {
+ Data.setFromOpaqueValue(V);
+}
+
+BoundsAttributedType::BoundsAttributedType(TypeClass TC, QualType Wrapped,
+ QualType Canon)
+ : Type(TC, Canon, Wrapped->getDependence()), WrappedTy(Wrapped) {}
+
+CountAttributedType::CountAttributedType(
+ QualType Wrapped, QualType Canon, Expr *CountExpr, bool CountInBytes,
+ bool OrNull, ArrayRef<TypeCoupledDeclRefInfo> CoupledDecls)
+ : BoundsAttributedType(CountAttributed, Wrapped, Canon),
+ CountExpr(CountExpr) {
+ CountAttributedTypeBits.NumCoupledDecls = CoupledDecls.size();
+ CountAttributedTypeBits.CountInBytes = CountInBytes;
+ CountAttributedTypeBits.OrNull = OrNull;
+ auto *DeclSlot = getTrailingObjects<TypeCoupledDeclRefInfo>();
+ Decls = llvm::ArrayRef(DeclSlot, CoupledDecls.size());
+ for (unsigned i = 0; i != CoupledDecls.size(); ++i)
+ DeclSlot[i] = CoupledDecls[i];
+}
+
TypedefType::TypedefType(TypeClass tc, const TypedefNameDecl *D,
QualType Underlying, QualType can)
: Type(tc, can, toSemanticDependence(can->getDependence())),
diff --git a/clang/lib/AST/TypeLoc.cpp b/clang/lib/AST/TypeLoc.cpp
index e12b9b50f6e722..c18e2e0b45af66 100644
--- a/clang/lib/AST/TypeLoc.cpp
+++ b/clang/lib/AST/TypeLoc.cpp
@@ -516,6 +516,10 @@ SourceRange AttributedTypeLoc::getLocalSourceRange() const {
return getAttr() ? getAttr()->getRange() : SourceRange();
}
+SourceRange CountAttributedTypeLoc::getLocalSourceRange() const {
+ return getCountExpr() ? getCountExpr()->getSourceRange() : SourceRange();
+}
+
SourceRange BTFTagAttributedTypeLoc::getLocalSourceRange() const {
return getAttr() ? getAttr()->getRange() : SourceRange();
}
diff --git a/clang/lib/AST/TypePrinter.cpp b/clang/lib/AST/TypePrinter.cpp
index f6941242927367..ab4d74385c1d8a 100644
--- a/clang/lib/AST/TypePrinter.cpp
+++ b/clang/lib/AST/TypePrinter.cpp
@@ -286,6 +286,7 @@ bool TypePrinter::canPrefixQualifiers(const Type *T,
case Type::PackExpansion:
case Type::SubstTemplateTypeParm:
case Type::MacroQualified:
+ case Type::CountAttributed:
CanPrefixQualifiers = false;
break;
@@ -1682,6 +1683,28 @@ void TypePrinter::printPackExpansionAfter(const PackExpansionType *T,
OS << "...";
}
+void TypePrinter::printCountAttributedBefore(const CountAttributedType *T,
+ raw_ostream &OS) {
+ printBefore(T->desugar(), OS);
+
+ if (T->isCountInBytes() && T->isOrNull())
+ OS << " __sized_by_or_null(";
+ else if (T->isCountInBytes())
+ OS << " __sized_by(";
+ else if (T->isOrNull())
+ OS << " __counted_by_or_null(";
+ else
+ OS << " __counted_by(";
+ if (T->getCountExpr())
+ T->getCountExpr()->printPretty(OS, nullptr, Policy);
+ OS << ')';
+}
+
+void TypePrinter::printCountAttributedAfter(const CountAttributedType *T,
+ raw_ostream &OS) {
+ printAfter(T->desugar(), OS);
+}
+
void TypePrinter::printAttributedBefore(const AttributedType *T,
raw_ostream &OS) {
// FIXME: Generate this with TableGen.
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 236d53bee4e8f1..653e04a5bc8704 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3644,6 +3644,7 @@ llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
case Type::TemplateSpecialization:
return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
+ case Type::CountAttributed:
case Type::Auto:
case Type::Attributed:
case Type::BTFTagAttributed:
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index 2673e4a5cee7bb..730632d1ed8eb3 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -2399,6 +2399,7 @@ void CodeGenFunction::EmitVariablyModifiedType(QualType type) {
case Type::BTFTagAttributed:
case Type::SubstTemplateTypeParm:
case Type::MacroQualified:
+ case Type::CountAttributed:
// Keep walking after single level desugaring.
type = type.getSingleStepDesugaredType(getContext());
break;
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 2f48ea237cdfa4..ca8c26afb48cd3 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -4706,6 +4706,7 @@ static void captureVariablyModifiedType(ASTContext &Context, QualType T,
case Type::BTFTagAttributed:
case Type::SubstTemplateTypeParm:
case Type::MacroQualified:
+ case Type::CountAttributed:
// Keep walking after single level desugaring.
T = T.getSingleStepDesugaredType(Context);
break;
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 1a1bc87d2b3203..27897bb87fb9bb 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -7119,6 +7119,13 @@ QualType TreeTransform<Derived>::TransformAttributedType(TypeLocBuilder &TLB,
});
}
+template <typename Derived>
+QualType TreeTransform<Derived>::TransformCountAttributedType(
+ TypeLocBuilder &TLB, CountAttributedTypeLoc TL) {
+ // TODO
+ llvm_unreachable("Unexpected TreeTransform for CountAttributedType");
+}
+
template <typename Derived>
QualType TreeTransform<Derived>::TransformBTFTagAttributedType(
TypeLocBuilder &TLB, BTFTagAttributedTypeLoc TL) {
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 287f9a0300be5c..9f1c06f542a667 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -6990,6 +6990,10 @@ void TypeLocReader::VisitAttributedTypeLoc(AttributedTypeLoc TL) {
TL.setAttr(ReadAttr());
}
+void TypeLocReader::VisitCountAttributedTypeLoc(CountAttributedTypeLoc TL) {
+ // nothing to do
+}
+
void TypeLocReader::VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
// Nothing to do.
}
@@ -9110,6 +9114,10 @@ DeclarationNameInfo ASTRecordReader::readDeclarationNameInfo() {
return NameInfo;
}
+TypeCoupledDeclRefInfo ASTRecordReader::readTypeCoupledDeclRefInfo() {
+ return TypeCoupledDeclRefInfo(readDeclAs<ValueDecl>(), readBool());
+}
+
void ASTRecordReader::readQualifierInfo(QualifierInfo &Info) {
Info.QualifierLoc = readNestedNameSpecifierLoc();
unsigned NumTPLists = readInt();
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 9950fa9c08faaa..5b371469483266 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -510,6 +510,10 @@ void TypeLocWriter::VisitAttributedTypeLoc(AttributedTypeLoc TL) {
Record.AddAttr(TL.getAttr());
}
+void TypeLocWriter::VisitCountAttributedTypeLoc(CountAttributedTypeLoc TL) {
+ // nothing to do
+}
+
void TypeLocWriter::VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
// Nothing to do.
}
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 841522a0f4788f..16a1469d59f66e 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -1773,6 +1773,10 @@ bool CursorVisitor::VisitAttributedTypeLoc(AttributedTypeLoc TL) {
return Visit(TL.getModifiedLoc());
}
+bool CursorVisitor::VisitCountAttributedTypeLoc(CountAttributedTypeLoc TL) {
+ return Visit(TL.getInnerLoc());
+}
+
bool CursorVisitor::VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
return Visit(TL.getWrappedLoc());
}
>From e65a99a00faba70960e75b4b8edb5acecb675197 Mon Sep 17 00:00:00 2001
From: Yeoul Na <yeoul_na at apple.com>
Date: Wed, 20 Dec 2023 16:09:17 +0900
Subject: [PATCH 2/2] Adjust CountedBy attribute definition and parse
CountAttributedType
---
clang/include/clang/Basic/Attr.td | 7 +-
.../clang/Basic/DiagnosticSemaKinds.td | 14 +-
clang/include/clang/Parse/Parser.h | 7 +
clang/include/clang/Sema/Sema.h | 12 +-
clang/lib/AST/Type.cpp | 8 +
clang/lib/CodeGen/CGExpr.cpp | 35 +---
clang/lib/Parse/ParseDecl.cpp | 50 +++++
clang/lib/Sema/SemaDecl.cpp | 6 -
clang/lib/Sema/SemaDeclAttr.cpp | 173 +++++++-----------
clang/lib/Sema/SemaExpr.cpp | 22 ++-
clang/lib/Sema/SemaType.cpp | 11 ++
11 files changed, 198 insertions(+), 147 deletions(-)
diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
index a03b0e44e15f7d..af2680be0da906 100644
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -4373,10 +4373,11 @@ def CodeAlign: StmtAttr {
}];
}
-def CountedBy : InheritableAttr {
+def CountedBy : DeclOrTypeAttr {
let Spellings = [Clang<"counted_by">];
- let Subjects = SubjectList<[Field]>;
- let Args = [IdentifierArgument<"CountedByField">];
+ let Subjects = SubjectList<[Field], ErrorDiag>;
+ let Args = [ExprArgument<"Count">, IntArgument<"NestedLevel">];
+ let ParseArgumentsAsUnevaluated = 1;
let Documentation = [CountedByDocs];
let LangOpts = [COnly];
// FIXME: This is ugly. Let using a DeclArgument would be nice, but a Decl
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 1a79892e40030a..ae8b90964c3fc9 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -6445,12 +6445,18 @@ def err_flexible_array_count_not_in_same_struct : Error<
"'counted_by' field %0 isn't within the same struct as the flexible array">;
def err_counted_by_attr_not_on_flexible_array_member : Error<
"'counted_by' only applies to C99 flexible array members">;
-def err_counted_by_attr_refers_to_flexible_array : Error<
- "'counted_by' cannot refer to the flexible array %0">;
+def err_counted_by_attr_refer_to_itself : Error<
+ "'counted_by' cannot refer to the flexible array member %0">;
def err_counted_by_must_be_in_structure : Error<
"field %0 in 'counted_by' not inside structure">;
-def err_flexible_array_counted_by_attr_field_not_integer : Error<
- "field %0 in 'counted_by' must be a non-boolean integer type">;
+def err_counted_by_attr_argument_not_integer : Error<
+ "'counted_by' requires a non-boolean integer type argument">;
+def err_counted_by_attr_only_support_simple_decl_reference : Error<
+ "'counted_by' argument must be a simple declaration reference">;
+def err_counted_by_attr_in_union : Error<
+ "'counted_by' cannot be applied to a union member">;
+def err_counted_by_attr_refer_to_union : Error<
+ "'counted_by' argument cannot refer to a union member">;
def note_flexible_array_counted_by_attr_field : Note<
"field %0 declared here">;
diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
index e50a4d05b45991..f88191ef5f52c2 100644
--- a/clang/include/clang/Parse/Parser.h
+++ b/clang/include/clang/Parse/Parser.h
@@ -3054,6 +3054,13 @@ class Parser : public CodeCompletionHandler {
SourceLocation ScopeLoc,
ParsedAttr::Form Form);
+ void ParseBoundsAttribute(IdentifierInfo &AttrName,
+ SourceLocation AttrNameLoc,
+ ParsedAttributes &Attrs,
+ IdentifierInfo *ScopeName,
+ SourceLocation ScopeLoc,
+ ParsedAttr::Form Form);
+
void ParseTypeofSpecifier(DeclSpec &DS);
SourceLocation ParseDecltypeSpecifier(DeclSpec &DS);
void AnnotateExistingDecltypeSpecifier(const DeclSpec &DS,
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index cf2d4fbe6d3ba1..027afb5d703d1d 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -1341,7 +1341,7 @@ class Sema final {
/// \brief Describes whether we are in an expression constext which we have
/// to handle differently.
enum ExpressionKind {
- EK_Decltype, EK_TemplateArgument, EK_Other
+ EK_Decltype, EK_TemplateArgument, EK_BoundsAttrArgument, EK_Other
} ExprContext;
// A context can be nested in both a discarded statement context and
@@ -1436,6 +1436,11 @@ class Sema final {
std::tuple<MangleNumberingContext *, Decl *>
getCurrentMangleNumberContext(const DeclContext *DC);
+ bool isBoundsAttrArgument() const {
+ return ExprEvalContexts.back().ExprContext ==
+ ExpressionEvaluationContextRecord::ExpressionKind::EK_BoundsAttrArgument;
+ }
+
/// SpecialMemberOverloadResult - The overloading result for a special member
/// function.
@@ -2612,6 +2617,9 @@ class Sema final {
QualType BuiltinChangeSignedness(QualType BaseType, UTTKind UKind,
SourceLocation Loc);
+ QualType BuildCountAttributedArrayType(QualType WrappedTy, Expr *CountExpr,
+ const llvm::SmallVector<TypeCoupledDeclRefInfo, 1> &Decls);
+
//===--------------------------------------------------------------------===//
// Symbol table / Decl tracking callbacks: SemaDecl.cpp.
//
@@ -4799,8 +4807,6 @@ class Sema final {
bool CheckAlwaysInlineAttr(const Stmt *OrigSt, const Stmt *CurSt,
const AttributeCommonInfo &A);
- bool CheckCountedByAttr(Scope *Scope, const FieldDecl *FD);
-
/// Adjust the calling convention of a method to be the ABI default if it
/// wasn't specified explicitly. This handles method types formed from
/// function type typedefs and typename template arguments.
diff --git a/clang/lib/AST/Type.cpp b/clang/lib/AST/Type.cpp
index 3c11b4be125594..01d5002a90c890 100644
--- a/clang/lib/AST/Type.cpp
+++ b/clang/lib/AST/Type.cpp
@@ -579,6 +579,14 @@ template <> const AttributedType *Type::getAs() const {
return getAsSugar<AttributedType>(this);
}
+template <> const BoundsAttributedType *Type::getAs() const {
+ return getAsSugar<BoundsAttributedType>(this);
+}
+
+template <> const CountAttributedType *Type::getAs() const {
+ return getAsSugar<CountAttributedType>(this);
+}
+
/// getUnqualifiedDesugaredType - Pull any qualifiers and syntactic
/// sugar off the given type. This should produce an object of the
/// same dynamic type as the canonical type.
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index d12e85b48d0b00..9cf0e8984de081 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -1136,38 +1136,19 @@ llvm::Value *CodeGenFunction::EmitCountedByFieldExpr(
}
const FieldDecl *CodeGenFunction::FindCountedByField(const FieldDecl *FD) {
- if (!FD || !FD->hasAttr<CountedByAttr>())
+ if (!FD)
return nullptr;
- const auto *CBA = FD->getAttr<CountedByAttr>();
- if (!CBA)
+ auto *CAT = FD->getType()->getAs<CountAttributedType>();
+ if (!CAT)
return nullptr;
- auto GetNonAnonStructOrUnion =
- [](const RecordDecl *RD) -> const RecordDecl * {
- while (RD && RD->isAnonymousStructOrUnion()) {
- const auto *R = dyn_cast<RecordDecl>(RD->getDeclContext());
- if (!R)
- return nullptr;
- RD = R;
- }
- return RD;
- };
- const RecordDecl *EnclosingRD = GetNonAnonStructOrUnion(FD->getParent());
- if (!EnclosingRD)
- return nullptr;
-
- DeclarationName DName(CBA->getCountedByField());
- DeclContext::lookup_result Lookup = EnclosingRD->lookup(DName);
-
- if (Lookup.empty())
- return nullptr;
-
- const NamedDecl *ND = Lookup.front();
- if (const auto *IFD = dyn_cast<IndirectFieldDecl>(ND))
- ND = IFD->getAnonField();
+ auto *CountDRE = cast<DeclRefExpr>(CAT->getCountExpr());
+ auto *CountDecl = CountDRE->getDecl();
+ if (const auto *IFD = dyn_cast<IndirectFieldDecl>(CountDecl))
+ CountDecl = IFD->getAnonField();
- return dyn_cast<FieldDecl>(ND);
+ return dyn_cast<FieldDecl>(CountDecl);
}
void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index ed684c5d57b1ee..1bbccfd47c3a88 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -629,6 +629,10 @@ void Parser::ParseGNUAttributeArgs(
ParseAttributeWithTypeArg(*AttrName, AttrNameLoc, Attrs, ScopeName,
ScopeLoc, Form);
return;
+ } else if (AttrKind == ParsedAttr::AT_CountedBy) {
+ ParseBoundsAttribute(*AttrName, AttrNameLoc, Attrs, ScopeName,
+ ScopeLoc, Form);
+ return;
}
// These may refer to the function arguments, but need to be parsed early to
@@ -3161,6 +3165,52 @@ void Parser::ParseAlignmentSpecifier(ParsedAttributes &Attrs,
}
}
+/// Bounds attributes (e.g., counted_by):
+/// AttrName '(' expression ')'
+void Parser::ParseBoundsAttribute(IdentifierInfo &AttrName, SourceLocation AttrNameLoc, ParsedAttributes &Attrs, IdentifierInfo *ScopeName,
+ SourceLocation ScopeLoc,
+ ParsedAttr::Form Form) {
+ assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
+
+ BalancedDelimiterTracker Parens(*this, tok::l_paren);
+ Parens.consumeOpen();
+
+ if (Tok.is(tok::r_paren)) {
+ Diag(Tok.getLocation(), diag::err_argument_required_after_attribute);
+ Parens.consumeClose();
+ return;
+ }
+
+ ArgsVector ArgExprs;
+ // Don't evaluate argument when the attribute is ignored.
+ using ExpressionKind =
+ Sema::ExpressionEvaluationContextRecord::ExpressionKind;
+ EnterExpressionEvaluationContext EC(
+ Actions, Sema::ExpressionEvaluationContext::PotentiallyEvaluated, nullptr,
+ ExpressionKind::EK_BoundsAttrArgument);
+
+ ExprResult ArgExpr(
+ Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
+
+ if (ArgExpr.isInvalid()) {
+ Parens.skipToEnd();
+ return;
+ }
+
+ ArgExprs.push_back(ArgExpr.get());
+ Parens.consumeClose();
+
+ ASTContext &Ctx = Actions.getASTContext();
+
+ ArgExprs.push_back(IntegerLiteral::Create(
+ Ctx, llvm::APInt(Ctx.getTypeSize(Ctx.getSizeType()), 0),
+ Ctx.getSizeType(), SourceLocation()));
+
+ Attrs.addNew(&AttrName, SourceRange(AttrNameLoc, Parens.getCloseLocation()),
+ ScopeName, ScopeLoc, ArgExprs.data(),
+ ArgExprs.size(), Form);
+}
+
ExprResult Parser::ParseExtIntegerArgument() {
assert(Tok.isOneOf(tok::kw__ExtInt, tok::kw__BitInt) &&
"Not an extended int type");
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index e92fd104d78eb5..8e46c4984d93dc 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -2315,12 +2315,6 @@ void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
}
ShadowingDecls.erase(ShadowI);
}
-
- if (!getLangOpts().CPlusPlus && S->isClassScope()) {
- if (auto *FD = dyn_cast<FieldDecl>(TmpD);
- FD && FD->hasAttr<CountedByAttr>())
- CheckCountedByAttr(S, FD);
- }
}
llvm::sort(DeclDiags,
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 1a58cfd8e4179e..eb4cd97350c6e0 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -8460,133 +8460,102 @@ static void handleZeroCallUsedRegsAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
D->addAttr(ZeroCallUsedRegsAttr::Create(S.Context, Kind, AL));
}
-static void handleCountedByAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
- if (!AL.isArgIdent(0)) {
- S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
- << AL << AANT_ArgumentIdentifier;
- return;
- }
- IdentifierLoc *IL = AL.getArgAsIdent(0);
- CountedByAttr *CBA =
- ::new (S.Context) CountedByAttr(S.Context, AL, IL->Ident);
- CBA->setCountedByFieldLoc(IL->Loc);
- D->addAttr(CBA);
+static const RecordDecl *GetEnclosingNamedOrTopAnonRecord(const FieldDecl *FD) {
+ const auto *RD = FD->getParent();
+ while (RD && RD->isAnonymousStructOrUnion()) {
+ const auto *Parent = dyn_cast<RecordDecl>(RD->getParent());
+ if (!Parent)
+ break;
+ RD = Parent;
+ }
+ return RD;
}
-static const FieldDecl *
-FindFieldInTopLevelOrAnonymousStruct(const RecordDecl *RD,
- const IdentifierInfo *FieldName) {
- for (const Decl *D : RD->decls()) {
- if (const auto *FD = dyn_cast<FieldDecl>(D))
- if (FD->getName() == FieldName->getName())
- return FD;
-
- if (const auto *R = dyn_cast<RecordDecl>(D))
- if (const FieldDecl *FD =
- FindFieldInTopLevelOrAnonymousStruct(R, FieldName))
- return FD;
+static bool CheckCountExpr(Sema &S, FieldDecl *FD, Expr *E,
+ llvm::SmallVector<TypeCoupledDeclRefInfo, 1> &Decls) {
+ if (FD->getParent()->isUnion()) {
+ S.Diag(FD->getBeginLoc(), diag::err_counted_by_attr_in_union) << FD->getSourceRange();
+ return true;
}
- return nullptr;
-}
+ if (!E->getType()->isIntegerType() || E->getType()->isBooleanType()) {
+ S.Diag(E->getBeginLoc(),
+ diag::err_counted_by_attr_argument_not_integer)
+ << E->getSourceRange();
+ return true;
+ }
-bool Sema::CheckCountedByAttr(Scope *S, const FieldDecl *FD) {
LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel =
LangOptions::StrictFlexArraysLevelKind::IncompleteOnly;
- if (!Decl::isFlexibleArrayMemberLike(Context, FD, FD->getType(),
+
+ if (!Decl::isFlexibleArrayMemberLike(S.getASTContext(), FD, FD->getType(),
StrictFlexArraysLevel, true)) {
// The "counted_by" attribute must be on a flexible array member.
SourceRange SR = FD->getLocation();
- Diag(SR.getBegin(), diag::err_counted_by_attr_not_on_flexible_array_member)
+ S.Diag(SR.getBegin(), diag::err_counted_by_attr_not_on_flexible_array_member)
<< SR;
return true;
}
- const auto *CBA = FD->getAttr<CountedByAttr>();
- const IdentifierInfo *FieldName = CBA->getCountedByField();
-
- auto GetNonAnonStructOrUnion = [](const RecordDecl *RD) {
- while (RD && !RD->getDeclName())
- if (const auto *R = dyn_cast<RecordDecl>(RD->getDeclContext()))
- RD = R;
- else
- break;
-
- return RD;
- };
-
- const RecordDecl *EnclosingRD = GetNonAnonStructOrUnion(FD->getParent());
- const FieldDecl *CountFD =
- FindFieldInTopLevelOrAnonymousStruct(EnclosingRD, FieldName);
+ auto *DRE = dyn_cast<DeclRefExpr>(E);
+ if (!DRE) {
+ S.Diag(E->getBeginLoc(),
+ diag::err_counted_by_attr_only_support_simple_decl_reference)
+ << E->getSourceRange();
+ return true;
+ }
+ auto *CountDecl = DRE->getDecl();
+ FieldDecl *CountFD = dyn_cast<FieldDecl>(CountDecl);
+ if (auto *IFD = dyn_cast<IndirectFieldDecl>(CountDecl)) {
+ CountFD = IFD->getAnonField();
+ }
if (!CountFD) {
- DeclarationNameInfo NameInfo(FieldName,
- CBA->getCountedByFieldLoc().getBegin());
- LookupResult MemResult(*this, NameInfo, Sema::LookupMemberName);
- LookupName(MemResult, S);
-
- if (!MemResult.empty()) {
- SourceRange SR = CBA->getCountedByFieldLoc();
- Diag(SR.getBegin(), diag::err_flexible_array_count_not_in_same_struct)
- << CBA->getCountedByField() << SR;
-
- if (auto *ND = MemResult.getAsSingle<NamedDecl>()) {
- SR = ND->getLocation();
- Diag(SR.getBegin(), diag::note_flexible_array_counted_by_attr_field)
- << ND << SR;
- }
+ S.Diag(E->getBeginLoc(), diag::err_counted_by_must_be_in_structure)
+ << CountDecl << E->getSourceRange();
+
+ S.Diag(CountDecl->getBeginLoc(), diag::note_flexible_array_counted_by_attr_field)
+ << CountDecl << CountDecl->getSourceRange();
+ return true;
+ }
+ if (FD->getParent() != CountFD->getParent()) {
+ if (CountFD->getParent()->isUnion()) {
+ S.Diag(CountFD->getBeginLoc(), diag::err_counted_by_attr_refer_to_union)
+ << CountFD->getSourceRange();
return true;
- } else {
- // The "counted_by" field needs to exist in the struct.
- LookupResult OrdResult(*this, NameInfo, Sema::LookupOrdinaryName);
- LookupName(OrdResult, S);
-
- if (!OrdResult.empty()) {
- SourceRange SR = FD->getLocation();
- Diag(SR.getBegin(), diag::err_counted_by_must_be_in_structure)
- << FieldName << SR;
-
- if (auto *ND = OrdResult.getAsSingle<NamedDecl>()) {
- SR = ND->getLocation();
- Diag(SR.getBegin(), diag::note_flexible_array_counted_by_attr_field)
- << ND << SR;
- }
-
- return true;
- }
}
+ // FIXME: whether CountRD is an anonymous struct is not determined at this point.
+ // check later if `FD` and `CountFD` are in the same enclosing named struct.
+ auto *RD = GetEnclosingNamedOrTopAnonRecord(FD);
+ auto *CountRD = GetEnclosingNamedOrTopAnonRecord(CountFD);
- CXXScopeSpec SS;
- DeclFilterCCC<FieldDecl> Filter(FieldName);
- return DiagnoseEmptyLookup(S, SS, MemResult, Filter, nullptr, std::nullopt,
- const_cast<DeclContext *>(FD->getDeclContext()));
+ if (RD != CountRD) {
+ S.Diag(CountFD->getBeginLoc(), diag::err_flexible_array_count_not_in_same_struct)
+ << CountFD << CountFD->getSourceRange();
+ return true;
+ }
}
- if (CountFD->hasAttr<CountedByAttr>()) {
- // The "counted_by" field can't point to the flexible array member.
- SourceRange SR = CBA->getCountedByFieldLoc();
- Diag(SR.getBegin(), diag::err_counted_by_attr_refers_to_flexible_array)
- << CBA->getCountedByField() << SR;
- return true;
- }
+ Decls.push_back(TypeCoupledDeclRefInfo(FD, /*IsDref*/false));
+ return false;
+}
- if (!CountFD->getType()->isIntegerType() ||
- CountFD->getType()->isBooleanType()) {
- // The "counted_by" field must have an integer type.
- SourceRange SR = CBA->getCountedByFieldLoc();
- Diag(SR.getBegin(),
- diag::err_flexible_array_counted_by_attr_field_not_integer)
- << CBA->getCountedByField() << SR;
+static void handleCountedByAttrField(Sema &S, Decl *D, const ParsedAttr &AL) {
+ auto *FD = dyn_cast<FieldDecl>(D);
+ assert(FD);
- SR = CountFD->getLocation();
- Diag(SR.getBegin(), diag::note_flexible_array_counted_by_attr_field)
- << CountFD << SR;
- return true;
- }
+ auto *CountExpr = AL.getArgAsExpr(0);
+ if (!CountExpr)
+ return;
- return false;
+ llvm::SmallVector<TypeCoupledDeclRefInfo, 1> Decls;
+ if (CheckCountExpr(S, FD, CountExpr, Decls))
+ return;
+
+ QualType CAT = S.BuildCountAttributedArrayType(FD->getType(), CountExpr, Decls);
+ FD->setType(CAT);
}
static void handleFunctionReturnThunksAttr(Sema &S, Decl *D,
@@ -9550,7 +9519,7 @@ ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D, const ParsedAttr &AL,
break;
case ParsedAttr::AT_CountedBy:
- handleCountedByAttr(S, D, AL);
+ handleCountedByAttrField(S, D, AL);
break;
// Microsoft attributes:
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index ca8c26afb48cd3..fac27fd6255fc6 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -2869,6 +2869,23 @@ Sema::ActOnIdExpression(Scope *S, CXXScopeSpec &SS,
// This is guaranteed from this point on.
assert(!R.empty() || ADL);
+ // BoundsSafety: This specially handles arguments of bounds attributes
+ // appertains to a type of C struct field such that the name lookup
+ // within a struct finds the member name, which is not the case for other
+ // contexts in C.
+ ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back();
+ using ExpressionKind = ExpressionEvaluationContextRecord::ExpressionKind;
+ if (LastRecord.ExprContext == ExpressionKind::EK_BoundsAttrArgument &&
+ !getLangOpts().CPlusPlus && S->isClassScope()) {
+ // See if this is reference to a field of struct.
+ if (auto *VD = dyn_cast<ValueDecl>(R.getFoundDecl())) {
+ QualType type = VD->getType().getNonReferenceType();
+ // This will eventually be translated into MemberExpr upon
+ // the use of instantiated struct fields.
+ return BuildDeclRefExpr(VD, type, VK_PRValue, NameLoc);
+ }
+ }
+
// Check whether this might be a C++ implicit instance member access.
// C++ [class.mfct.non-static]p3:
// When an id-expression that is not part of a class member access
@@ -2893,7 +2910,7 @@ Sema::ActOnIdExpression(Scope *S, CXXScopeSpec &SS,
// to get this right here so that we don't end up making a
// spuriously dependent expression if we're inside a dependent
// instance method.
- if (!R.empty() && (*R.begin())->isCXXClassMember()) {
+ if (getLangOpts().CPlusPlus && !R.empty() && (*R.begin())->isCXXClassMember()) {
bool MightBeImplicitMember;
if (!IsAddressOfOperand)
MightBeImplicitMember = true;
@@ -3549,7 +3566,8 @@ ExprResult Sema::BuildDeclarationNameExpr(
case Decl::Field:
case Decl::IndirectField:
case Decl::ObjCIvar:
- assert(getLangOpts().CPlusPlus && "building reference to field in C?");
+ assert((getLangOpts().CPlusPlus || isBoundsAttrArgument())
+ && "building reference to field in C?");
// These can't have reference type in well-formed programs, but
// for internal consistency we do this anyway.
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
index a376f20fa4f4e0..e613f9d2f98a75 100644
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -9606,6 +9606,17 @@ QualType Sema::BuildTypeofExprType(Expr *E, TypeOfKind Kind) {
return Context.getTypeOfExprType(E, Kind);
}
+QualType Sema::BuildCountAttributedArrayType(QualType WrappedTy, Expr *CountExpr,
+ const llvm::SmallVector<TypeCoupledDeclRefInfo, 1> &Decls) {
+ assert(WrappedTy->isIncompleteArrayType());
+
+ /// When the resulting expression is invalid, we still create the AST using
+ /// the original count expression for the sake of AST dump.
+ return Context.getCountAttributedType(
+ WrappedTy, CountExpr, /*CountInBytes*/false, /*OrNull*/false,
+ llvm::ArrayRef(Decls.begin(), Decls.end()));
+}
+
/// getDecltypeForExpr - Given an expr, will return the decltype for
/// that expression, according to the rules in C++11
/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18.
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