use variadic macros/templates in IPC message implementation

tools/ipc_fuzzer/message_tools/message_list.cc

 // Copyright 2014 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.
 
 #include <algorithm>
 #include <iostream>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 
 // Include once to get the type definitions
 #include "tools/ipc_fuzzer/message_lib/all_messages.h"
 
 struct msginfo {
   const char* name;
   const char* file;
   int id;
-  int in_count;
-  int out_count;
 
   bool operator< (const msginfo& other) const {
     return id < other.id;
   }
 };
 
 // Redefine macros to generate table
 #include "tools/ipc_fuzzer/message_lib/all_message_null_macros.h"
 #undef IPC_MESSAGE_DECL
-#define IPC_MESSAGE_DECL(kind, type, name, in, out, ilist, olist) \
-  { #name, __FILE__, IPC_MESSAGE_ID(), in, out },
+#define IPC_MESSAGE_DECL(name, ...)     \
+  { #name, __FILE__, IPC_MESSAGE_ID() } \
+  ,
 
 static msginfo msgtable[] = {
 #include "tools/ipc_fuzzer/message_lib/all_messages.h"
 };
 #define MSGTABLE_SIZE (sizeof(msgtable)/sizeof(msgtable[0]))
 static_assert(MSGTABLE_SIZE, "check your headers for an extra semicolon");
 
 static bool check_msgtable() {
   bool result = true;
   int previous_class_id = 0;
@@ skipping 92 matching lines @@
       if (show_comma) {
         if (!first)
           std::cout << ",";
         first = false;
         std::cout << msgtable[i].id;
       } else {
         if (show_ids)
           std::cout << msgtable[i].id << " " <<
               IPC_MESSAGE_ID_CLASS(msgtable[i].id) << "," <<
               IPC_MESSAGE_ID_LINE(msgtable[i].id) << " ";
-        std::cout << msgtable[i].name;
-        if (show_args) {
-          std::cout << "(" << msgtable[i].in_count << " IN, "  <<
-              msgtable[i].out_count << " OUT)";
-        }
-        std::cout << "\n";
+        std::cout << msgtable[i].name << "\n";
       }
     }
   }
   if (show_comma)
     std::cout << "\n";
 }
 
 int main(int argc, char **argv) {
   bool show_args = false;
   bool show_ids  = false;
@@ skipping 23 matching lines @@
   }
 
   std::sort(msgtable, msgtable + MSGTABLE_SIZE);
 
   if (!skip_check && check_msgtable() == false)
     return 1;
 
   dump_msgtable(show_args, show_ids, show_comma, filter);
   return 0;
 }
-