Clang plugin to check that unstable types are not used in IPC.

ipc/ipc_message_utils.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IPC_IPC_MESSAGE_UTILS_H_
 #define IPC_IPC_MESSAGE_UTILS_H_
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 58 matching lines @@
   std::string params;
 };
 
 //-----------------------------------------------------------------------------
 
 // A dummy struct to place first just to allow leading commas for all
 // members in the macro-generated constructor initializer lists.
 struct NoParams {
 };
 
+// Specializations are checked by 'IPC checker' part of find-bad-constructs
+// Clang plugin (see WriteParam() below for the details).
+template <typename... Ts>
+struct CheckedTuple {
+  typedef std::tuple<Ts...> Tuple;
+};
+
 template <class P>
 static inline void GetParamSize(base::PickleSizer* sizer, const P& p) {
   typedef typename SimilarTypeTraits<P>::Type Type;
   ParamTraits<Type>::GetSize(sizer, static_cast<const Type&>(p));
 }
 
+// This function is checked by 'IPC checker' part of find-bad-constructs
+// Clang plugin to make it's not called on the following types:
+// 1. long / unsigned long (but not typedefs to)
+// 2. intmax_t, uintmax_t, intptr_t, uintptr_t, wint_t,
+//    size_t, rsize_t, ssize_t, ptrdiff_t, dev_t, off_t, clock_t,
+//    time_t, suseconds_t (including typedefs to)
+// 3. Any template referencing types above (e.g. std::vector<size_t>)
 template <class P>
 static inline void WriteParam(base::Pickle* m, const P& p) {
   typedef typename SimilarTypeTraits<P>::Type Type;
   ParamTraits<Type>::Write(m, static_cast<const Type& >(p));
 }
 
 template <class P>
 static inline bool WARN_UNUSED_RESULT ReadParam(const base::Pickle* m,
                                                 base::PickleIterator* iter,
                                                 P* p) {
@@ skipping 989 matching lines @@
 template <class ReplyParamType>
 inline void LogReplyParamsToMessage(const ReplyParamType& reply_params,
                                     const Message* msg) {}
 
 inline void ConnectMessageAndReply(const Message* msg, Message* reply) {}
 #endif
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_H_