Handle converting member pointers to bool.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89692 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 29 insertions, 0 deletions

diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp
index 5c6657c6c7..fce4f111a9 100644
--- a/lib/CodeGen/CGExprScalar.cpp
+++ b/lib/CodeGen/CGExprScalar.cpp
@@ -901,6 +901,35 @@ Value *ScalarExprEmitter::EmitCastExpr(const CastExpr *CE) {
     return Yay;
   }
 
+  case CastExpr::CK_MemberPointerToBoolean: {
+    const MemberPointerType* T = E->getType()->getAs<MemberPointerType>();
+    
+    if (T->getPointeeType()->isFunctionType()) {
+      // We have a member function pointer.
+      llvm::Value *Ptr = CGF.CreateTempAlloca(ConvertType(E->getType()));
+      
+      CGF.EmitAggExpr(E, Ptr, /*VolatileDest=*/false);
+      
+      // Get the pointer.
+      llvm::Value *FuncPtr = Builder.CreateStructGEP(Ptr, 0, "src.ptr");
+      FuncPtr = Builder.CreateLoad(FuncPtr);
+      
+      llvm::Value *IsNotNull = 
+        Builder.CreateICmpNE(FuncPtr,
+                             llvm::Constant::getNullValue(FuncPtr->getType()),
+                             "tobool");
+      
+      return IsNotNull;
+    }
+   
+    // We have a regular member pointer.
+    Value *Ptr = Visit(const_cast<Expr*>(E));
+    llvm::Value *IsNotNull = 
+      Builder.CreateICmpNE(Ptr, CGF.CGM.EmitNullConstant(E->getType()),
+                           "tobool");
+    return IsNotNull;
+  }
+      
   }
 
   // Handle cases where the source is an non-complex type.