Merge release/21.x into cheriot

Author: resistor

clang/cmake/caches/PGO.cmake

@@ -5,7 +5,7 @@ set(LLVM_ENABLE_PROJECTS "clang;lld" CACHE STRING "")
 set(LLVM_ENABLE_RUNTIMES "compiler-rt;libcxx;libcxxabi;libunwind" CACHE STRING "")
 
 set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "")
-set(BOOTSTRAP_LLVM_BUILD_INSTRUMENTED ON CACHE BOOL "")
+set(BOOTSTRAP_LLVM_BUILD_INSTRUMENTED IR CACHE BOOL "")
 set(CLANG_BOOTSTRAP_TARGETS
   generate-profdata
   stage2

clang/docs/index.rst

@@ -45,6 +45,7 @@ Using Clang as a Compiler
    BoundsSafetyImplPlans
    ControlFlowIntegrity
    LTOVisibility
+   PointerAuthentication
    SafeStack
    ShadowCallStack
    SourceBasedCodeCoverage

clang/include/clang/AST/ASTContext.h

@@ -656,8 +656,7 @@ class ASTContext : public RefCountedBase<ASTContext> {
   bool containsNonRelocatablePointerAuth(QualType T) {
     if (!isPointerAuthenticationAvailable())
       return false;
-    return findPointerAuthContent(T) ==
-           PointerAuthContent::AddressDiscriminatedData;
+    return findPointerAuthContent(T) != PointerAuthContent::None;
   }
 
 private:

clang/lib/AST/ASTContext.cpp

@@ -3091,7 +3091,7 @@ bool ASTContext::hasUniqueObjectRepresentations(
     return true;
   }
 
-  // All other pointers (except __ptrauth pointers) are unique.
+  // All other pointers are unique.
   if (Ty->isPointerType())
     return !Ty.hasAddressDiscriminatedPointerAuth();
 

clang/lib/AST/DeclCXX.cpp

@@ -1448,6 +1448,13 @@ void CXXRecordDecl::addedMember(Decl *D) {
         data().StructuralIfLiteral = false;
     }
 
+    // If this type contains any address discriminated values we should
+    // have already indicated that the only special member functions that
+    // can possibly be trivial are the default constructor and destructor.
+    if (T.hasAddressDiscriminatedPointerAuth())
+      data().HasTrivialSpecialMembers &=
+          SMF_DefaultConstructor | SMF_Destructor;
+
     // C++14 [meta.unary.prop]p4:
     //   T is a class type [...] with [...] no non-static data members other
     //   than subobjects of zero size

clang/lib/AST/ExprConstant.cpp

@@ -7914,8 +7914,9 @@ static bool checkBitCastConstexprEligibilityType(SourceLocation Loc,
       // so its layout is unspecified. For now, we'll simply treat these cases
       // as unsupported (this should only be possible with OpenCL bool vectors
       // whose element count isn't a multiple of the byte size).
-      Info->FFDiag(Loc, diag::note_constexpr_bit_cast_invalid_vector)
-          << QualType(VTy, 0) << EltSize << NElts << Ctx.getCharWidth();
+      if (Info)
+        Info->FFDiag(Loc, diag::note_constexpr_bit_cast_invalid_vector)
+            << QualType(VTy, 0) << EltSize << NElts << Ctx.getCharWidth();
       return false;
     }
 
@@ -7924,8 +7925,9 @@ static bool checkBitCastConstexprEligibilityType(SourceLocation Loc,
       // The layout for x86_fp80 vectors seems to be handled very inconsistently
       // by both clang and LLVM, so for now we won't allow bit_casts involving
       // it in a constexpr context.
-      Info->FFDiag(Loc, diag::note_constexpr_bit_cast_unsupported_type)
-          << EltTy;
+      if (Info)
+        Info->FFDiag(Loc, diag::note_constexpr_bit_cast_unsupported_type)
+            << EltTy;
       return false;
     }
   }

clang/lib/AST/Type.cpp

@@ -2864,6 +2864,11 @@ bool QualType::isCXX98PODType(const ASTContext &Context) const {
     return false;
 
   QualType CanonicalType = getTypePtr()->CanonicalType;
+
+  // Any type that is, or contains, address discriminated data is never POD.
+  if (const_cast<ASTContext&>(Context).containsAddressDiscriminatedPointerAuth(CanonicalType))
+    return false;
+
   switch (CanonicalType->getTypeClass()) {
     // Everything not explicitly mentioned is not POD.
   default:
@@ -2922,6 +2927,11 @@ bool QualType::isTrivialType(const ASTContext &Context) const {
   if (CanonicalType->isDependentType())
     return false;
 
+  // Any type that is, or contains, address discriminated data is never a
+  // trivial type.
+  if (const_cast<ASTContext&>(Context).containsAddressDiscriminatedPointerAuth(CanonicalType))
+    return false;
+
   // C++0x [basic.types]p9:
   //   Scalar types, trivial class types, arrays of such types, and
   //   cv-qualified versions of these types are collectively called trivial
@@ -3019,6 +3029,12 @@ bool QualType::isBitwiseCloneableType(const ASTContext &Context) const {
 
   if (CanonicalType->isIncompleteType())
     return false;
+
+  // Any type that is, or contains, address discriminated data is never
+  // bitwise clonable.
+  if (const_cast<ASTContext&>(Context).containsAddressDiscriminatedPointerAuth(CanonicalType))
+    return false;
+
   const auto *RD = CanonicalType->getAsRecordDecl(); // struct/union/class
   if (!RD)
     return true;
@@ -3264,6 +3280,10 @@ bool QualType::isCXX11PODType(const ASTContext &Context) const {
   if (BaseTy->isIncompleteType())
     return false;
 
+  // Any type that is, or contains, address discriminated data is non-POD.
+  if (const_cast<ASTContext&>(Context).containsAddressDiscriminatedPointerAuth(*this))
+    return false;
+
   // As an extension, Clang treats vector types as Scalar types.
   if (BaseTy->isScalarType() || BaseTy->isVectorType())
     return true;

clang/lib/Sema/SemaDecl.cpp

@@ -19813,6 +19813,7 @@ void Sema::ActOnFields(Scope *S, SourceLocation RecLoc, Decl *EnclosingDecl,
                  Q && Q.isAddressDiscriminated()) {
         Record->setArgPassingRestrictions(
             RecordArgPassingKind::CanNeverPassInRegs);
+        Record->setNonTrivialToPrimitiveCopy(true);
       }
     }
 

clang/lib/Sema/SemaTypeTraits.cpp

@@ -1778,7 +1778,10 @@ static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT,
       // Objective-C lifetime, this is a non-trivial assignment.
       if (LhsT.getNonReferenceType().hasNonTrivialObjCLifetime())
         return false;
-
+      ASTContext &Context = Self.getASTContext();
+      if (Context.containsAddressDiscriminatedPointerAuth(LhsT) ||
+          Context.containsAddressDiscriminatedPointerAuth(RhsT))
+        return false;
       return !Result.get()->hasNonTrivialCall(Self.Context);
     }
 

clang/lib/StaticAnalyzer/Core/ExprEngineC.cpp

@@ -920,7 +920,8 @@ VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex,
   QualType T = Ex->getTypeOfArgument();
 
   for (ExplodedNode *N : CheckedSet) {
-    if (Ex->getKind() == UETT_SizeOf) {
+    if (Ex->getKind() == UETT_SizeOf || Ex->getKind() == UETT_DataSizeOf ||
+        Ex->getKind() == UETT_CountOf) {
       if (!T->isIncompleteType() && !T->isConstantSizeType()) {
         assert(T->isVariableArrayType() && "Unknown non-constant-sized type.");