-Wsentinel: Suggest nullptr in C++11 instead of NULL

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@221945 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaExpr.cpp

@@ -398,8 +398,8 @@ void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
   if (sentinelExpr->isValueDependent()) return;
   if (Context.isSentinelNullExpr(sentinelExpr)) return;
-  // Pick a reasonable string to insert.  Optimistically use 'nil' or
-  // 'NULL' if those are actually defined in the context.  Only use
+  // Pick a reasonable string to insert.  Optimistically use 'nil', 'nullptr',
+  // or 'NULL' if those are actually defined in the context.  Only use
   // 'nil' for ObjC methods, where it's much more likely that the
   // variadic arguments form a list of object pointers.
   SourceLocation MissingNilLoc
@@ -408,6 +408,8 @@ void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
   if (calleeType == CT_Method &&
       PP.getIdentifierInfo("nil")->hasMacroDefinition())
     NullValue = "nil";
+  else if (getLangOpts().CPlusPlus11)
+    NullValue = "nullptr";
   else if (PP.getIdentifierInfo("NULL")->hasMacroDefinition())
     NullValue = "NULL";
   else

test/Sema/sentinel-attribute.c

 // RUN: %clang_cc1 -fsyntax-only -verify %s
+// RUN: not %clang_cc1 -fsyntax-only %s -fdiagnostics-parseable-fixits 2>&1 | \
+// RUN:         FileCheck %s --check-prefix=C
+// RUN: not %clang_cc1 -fsyntax-only %s -fdiagnostics-parseable-fixits -x c++ -std=c++11 2>&1 | \
+// RUN:         FileCheck %s --check-prefix=CXX11
 int x __attribute__((sentinel)); //expected-warning{{'sentinel' attribute only applies to functions, methods and blocks}}
 
-void f1(int a, ...) __attribute__ ((sentinel));
+void f1(int a, ...) __attribute__ ((sentinel)); // expected-note {{function has been explicitly marked sentinel here}}
 void f2(int a, ...) __attribute__ ((sentinel(1)));
 
 void f3(int a, ...) __attribute__ ((sentinel("hello"))); //expected-error{{'sentinel' attribute requires parameter 1 to be an integer constant}}
@@ -13,3 +17,10 @@ void f5(int a) __attribute__ ((sentinel)); //expected-warning{{'sentinel' attrib
 
 
 void f6() __attribute__((__sentinel__));  // expected-warning {{'sentinel' attribute requires named arguments}}
+
+void g() {
+  // The integer literal zero is not a sentinel.
+  f1(1, 0); // expected-warning {{missing sentinel in function call}}
+// C: fix-it:{{.*}}:{23:10-23:10}:", (void*) 0"
+// CXX11: fix-it:{{.*}}:{23:10-23:10}:", nullptr"
+}