Make the CXXDefaultArgExpr constructor protected and add a static Create function.

llvm-svn: 79013

clang/include/clang/AST/ExprCXX.h

@@ -382,14 +382,20 @@ public:
 /// supply arguments for all of the parameters.
 class CXXDefaultArgExpr : public Expr {
   ParmVarDecl *Param;
+    
+protected:
+  CXXDefaultArgExpr(StmtClass SC, ParmVarDecl *param) 
+    : Expr(SC, param->hasUnparsedDefaultArg() ? 
+           param->getType().getNonReferenceType()
+           : param->getDefaultArg()->getType()),
+    Param(param) { }
+    
 public:
   // Param is the parameter whose default argument is used by this
   // expression.
-  explicit CXXDefaultArgExpr(ParmVarDecl *param) 
-    : Expr(CXXDefaultArgExprClass, 
-           param->hasUnparsedDefaultArg()? param->getType().getNonReferenceType()
-                                         : param->getDefaultArg()->getType()),
-      Param(param) { }
+  static CXXDefaultArgExpr *Create(ASTContext &C, ParmVarDecl *Param) {
+    return new (C) CXXDefaultArgExpr(CXXDefaultArgExprClass, Param);
+  }
 
   // Retrieve the parameter that the argument was created from.
   const ParmVarDecl *getParam() const { return Param; }

clang/lib/Sema/SemaDeclCXX.cpp

@@ -2394,7 +2394,7 @@ Expr *Sema::BuildCXXConstructExpr(ASTContext &C,
       for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I)
         ExprTemporaries.push_back(E->getTemporary(I));
     }
-    Expr *Arg = new (C) CXXDefaultArgExpr(FDecl->getParamDecl(j));
+    Expr *Arg = CXXDefaultArgExpr::Create(C, FDecl->getParamDecl(j));
     Temp->setArg(j, Arg);
   }
   return Temp;

clang/lib/Sema/SemaExpr.cpp

@@ -2657,7 +2657,7 @@ Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
       }
   
       // We already type-checked the argument, so we know it works.
-      Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i));
+      Arg = CXXDefaultArgExpr::Create(Context, FDecl->getParamDecl(i));
     }
     
     QualType ArgType = Arg->getType();

clang/lib/Sema/SemaOverload.cpp

@@ -4531,7 +4531,7 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Object,
       QualType ProtoArgType = Proto->getArgType(i);
       IsError |= PerformCopyInitialization(Arg, ProtoArgType, "passing");
     } else {
-      Arg = new (Context) CXXDefaultArgExpr(Method->getParamDecl(i));
+      Arg = CXXDefaultArgExpr::Create(Context, Method->getParamDecl(i));
     }
 
     TheCall->setArg(i + 1, Arg);

clang/lib/Sema/TreeTransform.h

@@ -1021,7 +1021,7 @@ public:
   /// require any semantic analysis. Subclasses may override this routine to
   /// provide different behavior.
   OwningExprResult RebuildCXXDefaultArgExpr(ParmVarDecl *Param) {
-    return getSema().Owned(new (getSema().Context) CXXDefaultArgExpr(Param));
+    return getSema().Owned(CXXDefaultArgExpr::Create(getSema().Context, Param));
   }
 
   /// \brief Build a new C++ zero-initialization expression.