Add support in GRExprEngine for UnaryOperator::AlignOf. This fixes one crash report in PR 2796.

llvm-svn: 57777

clang/lib/Analysis/GRExprEngine.cpp

@@ -1781,6 +1781,23 @@ void GRExprEngine::VisitUnaryOperator(UnaryOperator* U, NodeTy* Pred,
       return;
     }
      
+    case UnaryOperator::AlignOf: {
+      
+      QualType T = U->getSubExpr()->getType();
+      
+      // FIXME: Add support for VLAs.
+      
+      if (!T.getTypePtr()->isConstantSizeType())
+        return;
+      
+      uint64_t size = getContext().getTypeAlign(T) / 8;                
+      const GRState* St = GetState(Pred);
+      St = SetSVal(St, U, NonLoc::MakeVal(getBasicVals(), size, U->getType()));
+      
+      MakeNode(Dst, U, Pred, St);
+      return;
+    }
+      
     case UnaryOperator::SizeOf: {
             
       QualType T = U->getSubExpr()->getType();

clang/test/Analysis/misc-ps.m

@@ -9,3 +9,7 @@
 }
 @end
 
+// Reduced test case from crash in PR 2796;
+//  http://llvm.org/bugs/show_bug.cgi?id=2796
+
+unsigned foo(unsigned x) { return __alignof__((x)) + sizeof(x); }