SemaExpr - silence static analyzer getAs<> null dereference warnings. NFCI.

The static analyzer is warning about potential null dereferences, but in these cases we should be able to use castAs<> directly and if not assert will fire for us.

llvm-svn: 373150

Author: RKSimon

clang/lib/Sema/SemaExpr.cpp

@@ -6714,8 +6714,8 @@ ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
   assert(Ty->isVectorType() && "Expected vector type");
 
   SmallVector<Expr *, 8> initExprs;
-  const VectorType *VTy = Ty->getAs<VectorType>();
-  unsigned numElems = Ty->getAs<VectorType>()->getNumElements();
+  const VectorType *VTy = Ty->castAs<VectorType>();
+  unsigned numElems = VTy->getNumElements();
 
   // '(...)' form of vector initialization in AltiVec: the number of
   // initializers must be one or must match the size of the vector.
@@ -6726,7 +6726,7 @@ ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
     // vector. If a single value is specified in the initializer then it will
     // be replicated to all the components of the vector
     if (numExprs == 1) {
-      QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
+      QualType ElemTy = VTy->getElementType();
       ExprResult Literal = DefaultLvalueConversion(exprs[0]);
       if (Literal.isInvalid())
         return ExprError();
@@ -6748,7 +6748,7 @@ ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
     if (getLangOpts().OpenCL &&
         VTy->getVectorKind() == VectorType::GenericVector &&
         numExprs == 1) {
-        QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
+        QualType ElemTy = VTy->getElementType();
         ExprResult Literal = DefaultLvalueConversion(exprs[0]);
         if (Literal.isInvalid())
           return ExprError();
@@ -7047,8 +7047,8 @@ checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS,
   QualType RHSTy = RHS.get()->getType();
 
   // get the "pointed to" types
-  QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
-  QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
+  QualType lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
+  QualType rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
 
   // ignore qualifiers on void (C99 6.5.15p3, clause 6)
   if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
@@ -7533,8 +7533,8 @@ QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
       LHS = RHS = true;
       return QualType();
     }
-    QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
-    QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
+    QualType lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
+    QualType rhptee = RHSTy->castAs<ObjCObjectPointerType>()->getPointeeType();
     QualType destPointee
     = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
     QualType destType = Context.getPointerType(destPointee);
@@ -7553,8 +7553,8 @@ QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
       LHS = RHS = true;
       return QualType();
     }
-    QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
-    QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
+    QualType lhptee = LHSTy->castAs<ObjCObjectPointerType>()->getPointeeType();
+    QualType rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
     QualType destPointee
     = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
     QualType destType = Context.getPointerType(destPointee);
@@ -8059,8 +8059,8 @@ checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType,
       return Sema::IncompatiblePointer;
     return Sema::Compatible;
   }
-  QualType lhptee = LHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
-  QualType rhptee = RHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
+  QualType lhptee = LHSType->castAs<ObjCObjectPointerType>()->getPointeeType();
+  QualType rhptee = RHSType->castAs<ObjCObjectPointerType>()->getPointeeType();
 
   if (!lhptee.isAtLeastAsQualifiedAs(rhptee) &&
       // make an exception for id<P>
@@ -9401,8 +9401,8 @@ static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
 
   // if both are pointers check if operation is valid wrt address spaces
   if (S.getLangOpts().OpenCL && isLHSPointer && isRHSPointer) {
-    const PointerType *lhsPtr = LHSExpr->getType()->getAs<PointerType>();
-    const PointerType *rhsPtr = RHSExpr->getType()->getAs<PointerType>();
+    const PointerType *lhsPtr = LHSExpr->getType()->castAs<PointerType>();
+    const PointerType *rhsPtr = RHSExpr->getType()->castAs<PointerType>();
     if (!lhsPtr->isAddressSpaceOverlapping(*rhsPtr)) {
       S.Diag(Loc,
              diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
@@ -10495,7 +10495,7 @@ static QualType checkArithmeticOrEnumeralThreeWayCompare(Sema &S,
       return QualType();
     }
     QualType IntType =
-        LHSStrippedType->getAs<EnumType>()->getDecl()->getIntegerType();
+        LHSStrippedType->castAs<EnumType>()->getDecl()->getIntegerType();
     assert(IntType->isArithmeticType());
 
     // We can't use `CK_IntegralCast` when the underlying type is 'bool', so we
@@ -10778,8 +10778,8 @@ QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
     if (LCanPointeeTy != RCanPointeeTy) {
       // Treat NULL constant as a special case in OpenCL.
       if (getLangOpts().OpenCL && !LHSIsNull && !RHSIsNull) {
-        const PointerType *LHSPtr = LHSType->getAs<PointerType>();
-        if (!LHSPtr->isAddressSpaceOverlapping(*RHSType->getAs<PointerType>())) {
+        const PointerType *LHSPtr = LHSType->castAs<PointerType>();
+        if (!LHSPtr->isAddressSpaceOverlapping(*RHSType->castAs<PointerType>())) {
           Diag(Loc,
                diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
               << LHSType << RHSType << 0 /* comparison */
@@ -11044,7 +11044,7 @@ QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
 // the largest type to the smallest type to avoid cases where long long == long,
 // where long gets picked over long long.
 QualType Sema::GetSignedVectorType(QualType V) {
-  const VectorType *VTy = V->getAs<VectorType>();
+  const VectorType *VTy = V->castAs<VectorType>();
   unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
 
   if (isa<ExtVectorType>(VTy)) {
@@ -11099,7 +11099,7 @@ QualType Sema::CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
   // If AltiVec, the comparison results in a numeric type, i.e.
   // bool for C++, int for C
   if (getLangOpts().AltiVec &&
-      vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
+      vType->castAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
     return Context.getLogicalOperationType();
 
   // For non-floating point types, check for self-comparisons of the form
@@ -12108,11 +12108,11 @@ static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
   } else if (S.getLangOpts().AltiVec && ResType->isVectorType()) {
     // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
   } else if (S.getLangOpts().ZVector && ResType->isVectorType() &&
-             (ResType->getAs<VectorType>()->getVectorKind() !=
+             (ResType->castAs<VectorType>()->getVectorKind() !=
               VectorType::AltiVecBool)) {
     // The z vector extensions allow ++ and -- for non-bool vectors.
   } else if(S.getLangOpts().OpenCL && ResType->isVectorType() &&
-            ResType->getAs<VectorType>()->getElementType()->isIntegerType()) {
+            ResType->castAs<VectorType>()->getElementType()->isIntegerType()) {
     // OpenCL V1.2 6.3 says dec/inc ops operate on integer vector types.
   } else {
     S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
@@ -12698,7 +12698,7 @@ static ExprResult convertHalfVecBinOp(Sema &S, ExprResult LHS, ExprResult RHS,
   LHS = convertVector(LHS.get(), Context.FloatTy, S);
   auto *BO = new (Context) BinaryOperator(LHS.get(), RHS.get(), Opc, BinOpResTy,
                                           VK, OK, OpLoc, FPFeatures);
-  return convertVector(BO, ResultTy->getAs<VectorType>()->getElementType(), S);
+  return convertVector(BO, ResultTy->castAs<VectorType>()->getElementType(), S);
 }
 
 static std::pair<ExprResult, ExprResult>
@@ -13454,7 +13454,7 @@ ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
     else if (resultType->isVectorType() &&
              // The z vector extensions don't allow + or - with bool vectors.
              (!Context.getLangOpts().ZVector ||
-              resultType->getAs<VectorType>()->getVectorKind() !=
+              resultType->castAs<VectorType>()->getVectorKind() !=
               VectorType::AltiVecBool))
       break;
     else if (getLangOpts().CPlusPlus && // C++ [expr.unary.op]p6
@@ -13483,7 +13483,7 @@ ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
     else if (resultType->isExtVectorType() && Context.getLangOpts().OpenCL) {
       // OpenCL v1.1 s6.3.f: The bitwise operator not (~) does not operate
       // on vector float types.
-      QualType T = resultType->getAs<ExtVectorType>()->getElementType();
+      QualType T = resultType->castAs<ExtVectorType>()->getElementType();
       if (!T->isIntegerType())
         return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
                           << resultType << Input.get()->getSourceRange());
@@ -13528,7 +13528,7 @@ ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
           !Context.getLangOpts().OpenCLCPlusPlus) {
         // OpenCL v1.1 6.3.h: The logical operator not (!) does not
         // operate on vector float types.
-        QualType T = resultType->getAs<ExtVectorType>()->getElementType();
+        QualType T = resultType->castAs<ExtVectorType>()->getElementType();
         if (!T->isIntegerType())
           return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
                            << resultType << Input.get()->getSourceRange());
@@ -14193,7 +14193,7 @@ ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
 
   // If the user wrote a function type in some form, try to use that.
   if (!BSI->FunctionType.isNull()) {
-    const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
+    const FunctionType *FTy = BSI->FunctionType->castAs<FunctionType>();
 
     FunctionType::ExtInfo Ext = FTy->getExtInfo();
     if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
@@ -14665,24 +14665,24 @@ bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
   case IncompatibleObjCQualifiedId: {
     if (SrcType->isObjCQualifiedIdType()) {
       const ObjCObjectPointerType *srcOPT =
-                SrcType->getAs<ObjCObjectPointerType>();
+                SrcType->castAs<ObjCObjectPointerType>();
       for (auto *srcProto : srcOPT->quals()) {
         PDecl = srcProto;
         break;
       }
       if (const ObjCInterfaceType *IFaceT =
-            DstType->getAs<ObjCObjectPointerType>()->getInterfaceType())
+            DstType->castAs<ObjCObjectPointerType>()->getInterfaceType())
         IFace = IFaceT->getDecl();
     }
     else if (DstType->isObjCQualifiedIdType()) {
       const ObjCObjectPointerType *dstOPT =
-        DstType->getAs<ObjCObjectPointerType>();
+        DstType->castAs<ObjCObjectPointerType>();
       for (auto *dstProto : dstOPT->quals()) {
         PDecl = dstProto;
         break;
       }
       if (const ObjCInterfaceType *IFaceT =
-            SrcType->getAs<ObjCObjectPointerType>()->getInterfaceType())
+            SrcType->castAs<ObjCObjectPointerType>()->getInterfaceType())
         IFace = IFaceT->getDecl();
     }
     DiagKind = diag::warn_incompatible_qualified_id;