Make sure to add MallocAttr to explicitly-declared operator new/new[]

when -fassume-sane-operator-new. Patch by Tom Jablin!

llvm-svn: 111363

clang/lib/Sema/SemaExprCXX.cpp

@@ -1257,8 +1257,11 @@ void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
           Context.getCanonicalType(
             Func->getParamDecl(0)->getType().getUnqualifiedType());
         // FIXME: Do we need to check for default arguments here?
-        if (Func->getNumParams() == 1 && InitialParamType == Argument)
+        if (Func->getNumParams() == 1 && InitialParamType == Argument) {
+          if(AddMallocAttr && !Func->hasAttr<MallocAttr>())
+            Func->addAttr(::new (Context) MallocAttr());
           return;
+        }
       }
     }
   }

clang/test/CodeGenCXX/new.cpp

@@ -73,6 +73,10 @@ void t8(int n) {
   new U[n];
 }
 
+// noalias
+// CHECK: declare noalias i8* @_Znam
+void *operator new[](size_t);
+
 void t9() {
   bool b;