Add a CK_FunctionToPointerDecay cast kind.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80719 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/Expr.h

@@ -1347,6 +1347,9 @@ public:
     /// CK_ArrayToPointerDecay - Array to pointer decay.
     CK_ArrayToPointerDecay,
     
+    // CK_FunctionToPointerDecay - Function to pointer decay.
+    CK_FunctionToPointerDecay,
+    
     /// CK_NullToMemberPointer - Null pointer to member pointer.
     CK_NullToMemberPointer,
     

lib/AST/StmtDumper.cpp

@@ -324,6 +324,9 @@ void StmtDumper::VisitCastExpr(CastExpr *Node) {
   case CastExpr::CK_ArrayToPointerDecay:
     fprintf(F, "<ArrayToPointerDecay>");
     break;
+  case CastExpr::CK_FunctionToPointerDecay:
+    fprintf(F, "<FunctionToPointerDecay>");
+    break;
   case CastExpr::CK_NullToMemberPointer:
     fprintf(F, "<NullToMemberPointer>");
     break;

lib/Sema/SemaExpr.cpp

@@ -196,7 +196,8 @@ void Sema::DefaultFunctionArrayConversion(Expr *&E) {
   assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
 
   if (Ty->isFunctionType())
-    ImpCastExprToType(E, Context.getPointerType(Ty));
+    ImpCastExprToType(E, Context.getPointerType(Ty), 
+                      CastExpr::CK_FunctionToPointerDecay);
   else if (Ty->isArrayType()) {
     // In C90 mode, arrays only promote to pointers if the array expression is
     // an lvalue.  The relevant legalese is C90 6.2.2.1p3: "an lvalue that has

lib/Sema/SemaExprCXX.cpp

@@ -1016,7 +1016,7 @@ Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
       FromType = From->getType();
     }
     FromType = Context.getPointerType(FromType);
-    ImpCastExprToType(From, FromType);
+    ImpCastExprToType(From, FromType, CastExpr::CK_FunctionToPointerDecay);
     break;
 
   default: