Patch to allow C-style cast from 'void *' to block pointer type.

(fixes radar 7465023).

llvm-svn: 91171

clang/include/clang/AST/Expr.h

@@ -1575,7 +1575,10 @@ public:
 
     /// CK_AnyPointerToObjCPointerCast - Casting any pointer to objective-c 
     /// pointer
-    CK_AnyPointerToObjCPointerCast
+    CK_AnyPointerToObjCPointerCast,
+    /// CK_AnyPointerToBlockPointerCast - Casting any pointer to block 
+    /// pointer
+    CK_AnyPointerToBlockPointerCast
 
   };
 

clang/lib/AST/Expr.cpp

@@ -560,6 +560,8 @@ const char *CastExpr::getCastKindName() const {
     return "MemberPointerToBoolean";
   case CastExpr::CK_AnyPointerToObjCPointerCast:
     return "AnyPointerToObjCPointerCast";
+  case CastExpr::CK_AnyPointerToBlockPointerCast:
+    return "AnyPointerToBlockPointerCast";
   }
 
   assert(0 && "Unhandled cast kind!");

clang/lib/CodeGen/CGExprScalar.cpp

@@ -809,6 +809,7 @@ Value *ScalarExprEmitter::EmitCastExpr(CastExpr *CE) {
     break;
 
   case CastExpr::CK_AnyPointerToObjCPointerCast:
+  case CastExpr::CK_AnyPointerToBlockPointerCast:
   case CastExpr::CK_BitCast: {
     Value *Src = Visit(const_cast<Expr*>(E));
     return Builder.CreateBitCast(Src, ConvertType(DestTy));

clang/lib/Sema/SemaCXXCast.cpp

@@ -545,6 +545,11 @@ static TryCastResult TryStaticCast(Sema &Self, Expr *&SrcExpr,
         Kind = CastExpr::CK_AnyPointerToObjCPointerCast;
         return TC_Success;
       }
+      else if (CStyle && DestType->isBlockPointerType()) {
+        // allow c-style cast of void * to block pointers.
+        Kind = CastExpr::CK_AnyPointerToBlockPointerCast;
+        return TC_Success;
+      }
     }
   }
 

clang/test/SemaObjCXX/blocks.mm

@@ -44,3 +44,9 @@ namespace N {
     foo(N::X()); // okay
 }
 @end
+
+typedef signed char BOOL;
+void foo6(void *block) {  
+	void (^vb)(id obj, int idx, BOOL *stop) = (void (^)(id, int, BOOL *))block;
+    BOOL (^bb)(id obj, int idx, BOOL *stop) = (BOOL (^)(id, int, BOOL *))block;
+}