Change common_message_generator code block.

Makes namespace IPC {} more tightly wrapped around the inclusion of
the genertor header file.

Updates comments in ipc_message_macros to indicate this new style of block.
Makes message ID generation into a macro so can be re-used in forthcoming
ipclist CL. Simplfies the NULL macros.

Adds #pragma once to param traits, because we can.

Review URL: http://codereview.chromium.org/6683014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@77943 0039d316-1c4b-4281-b951-d872f2087c98

7 files changed, 45 insertions, 167 deletions

diff --git a/chrome/common/common_message_generator.cc b/chrome/common/common_message_generator.cc
index e349e3b..6b822ec 100644
--- a/chrome/common/common_message_generator.cc
+++ b/chrome/common/common_message_generator.cc
@@ -15,19 +15,21 @@
 #include "ipc/struct_destructor_macros.h"
 #include "chrome/common/common_message_generator.h"
 
-namespace IPC {
-
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
+namespace IPC {
 #include "chrome/common/common_message_generator.h"
+}  // namespace IPC
 
 // Generate param traits read methods.
 #include "ipc/param_traits_read_macros.h"
+namespace IPC {
 #include "chrome/common/common_message_generator.h"
+}  // namespace IPC
 
 // Generate param traits log methods.
 #include "ipc/param_traits_log_macros.h"
+namespace IPC {
 #include "chrome/common/common_message_generator.h"
-
 }  // namespace IPC
 
diff --git a/content/common/content_message_generator.cc b/content/common/content_message_generator.cc
index eacddef..00f2237 100644
--- a/content/common/content_message_generator.cc
+++ b/content/common/content_message_generator.cc
@@ -15,18 +15,21 @@
 #include "ipc/struct_destructor_macros.h"
 #include "content/common/content_message_generator.h"
 
-namespace IPC {
-
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
+namespace IPC {
 #include "content/common/content_message_generator.h"
+}  // namespace IPC
 
 // Generate param traits read methods.
 #include "ipc/param_traits_read_macros.h"
+namespace IPC {
 #include "content/common/content_message_generator.h"
+}  // namespace IPC
 
 // Generate param traits log methods.
 #include "ipc/param_traits_log_macros.h"
+namespace IPC {
 #include "content/common/content_message_generator.h"
-
 }  // namespace IPC
+
diff --git a/ipc/ipc_message_macros.h b/ipc/ipc_message_macros.h
index a41cadf..bdc5acc 100644
--- a/ipc/ipc_message_macros.h
+++ b/ipc/ipc_message_macros.h
@@ -29,9 +29,9 @@
 // A message generator .h header file pulls in all other message-declaring
 // headers for a given component.  It is included by a message generator
 // .cc file, which is where all the generated code will wind up.  Typically,
-// you will use an existing generator (e.g. common_message_generator.cc and
-// common_message_generator.h in /chrome/common), but there are circumstances
-// where you may add a new one.
+// you will use an existing generator (e.g. common_message_generator.cc
+// in /chrome/common), but there are circumstances where you may add a
+// new one.
 //
 // In the rare cicrucmstances where you can't re-use an existing file,
 // your YYY_message_generator.cc file for a component YYY would contain
@@ -45,15 +45,19 @@
 //     // Generate destructors.
 //     #include "ipc/struct_destructor_macros.h"
 //     #include "path/to/YYY_message_generator.h"
-//     namespace IPC {
 //     // Generate param traits write methods.
 //     #include "ipc/param_traits_write_macros.h"
+//     namespace IPC {
 //     #include "path/to/YYY_message_generator.h"
+//     }  // namespace IPC
 //     // Generate param traits read methods.
 //     #include "ipc/param_traits_read_macros.h"
+//     namespace IPC {
 //     #include "path/to/YYY_message_generator.h"
+//     }  // namespace IPC
 //     // Generate param traits log methods.
 //     #include "ipc/param_traits_log_macros.h"
+//     namespace IPC {
 //     #include "path/to/YYY_message_generator.h"
 //     }  // namespace IPC
 //
@@ -186,7 +190,7 @@
 #define IPC_STRUCT_END() };
 
 // Message macros collect specific numbers of arguments and funnel them into
-// the common message generation macro.
+// the common message generation macro.  These should never be redefined.
 #define IPC_MESSAGE_CONTROL0(msg_class) \
   IPC_MESSAGE_DECL(EMPTY, CONTROL, msg_class, 0, 0, (), ())
 
@@ -406,11 +410,7 @@
 // Common message macro which dispatches into one of the 6 (sync x kind)
 // routines.  There is a way that these 6 cases can be lumped together,
 // but the  macros get very complicated in that case.
-// Note: we currently use __LINE__ to give unique IDs to messages within
-// a file.  They're globally unique since each file defines its own
-// IPC_MESSAGE_START.  Ideally, we wouldn't use line numbers (a possibility
-// is to instead use the __COUNTER__ macro, but it needs gcc 4.3 and xcode
-// doesn't use it yet).
+// Note: intended be redefined to generate other information.
 #define IPC_MESSAGE_DECL(sync, kind, msg_class,                               \
                          in_cnt, out_cnt, in_list, out_list)                  \
   IPC_##sync##_##kind##_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
@@ -419,14 +419,14 @@
 #define IPC_EMPTY_CONTROL_DECL(msg_class, in_cnt, out_cnt, in_list, out_list) \
   class msg_class : public IPC::Message {                                     \
    public:                                                                    \
-    enum { ID = (IPC_MESSAGE_START << 16) + __LINE__ };                       \
+    enum { ID = IPC_MESSAGE_ID() };                                           \
     msg_class() : IPC::Message(MSG_ROUTING_CONTROL, ID, PRIORITY_NORMAL) {}   \
   };
 
 #define IPC_EMPTY_ROUTED_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
   class msg_class : public IPC::Message {                                     \
    public:                                                                    \
-    enum { ID = (IPC_MESSAGE_START << 16) + __LINE__ };                       \
+    enum { ID = IPC_MESSAGE_ID() };                                           \
     msg_class(int32 routing_id)                                               \
         : IPC::Message(routing_id, ID, PRIORITY_NORMAL) {}                    \
   };
@@ -435,7 +435,7 @@
   class msg_class :                                                           \
       public IPC::MessageWithTuple<IPC_TUPLE_IN_##in_cnt in_list> {           \
    public:                                                                    \
-    enum { ID = (IPC_MESSAGE_START << 16) + __LINE__ };                       \
+    enum { ID = IPC_MESSAGE_ID() };                                           \
     msg_class(IPC_TYPE_IN_##in_cnt in_list);                                  \
     ~msg_class();                                                             \
     static void Log(std::string* name, const Message* msg, std::string* l);   \
@@ -445,7 +445,7 @@
   class msg_class :                                                           \
       public IPC::MessageWithTuple<IPC_TUPLE_IN_##in_cnt in_list> {           \
    public:                                                                    \
-    enum { ID = (IPC_MESSAGE_START << 16) + __LINE__ };                       \
+    enum { ID = IPC_MESSAGE_ID() };                                           \
     msg_class(int32 routing_id IPC_COMMA_##in_cnt                             \
               IPC_TYPE_IN_##in_cnt in_list);                                  \
     ~msg_class();                                                             \
@@ -457,7 +457,7 @@
       public IPC::MessageWithReply<IPC_TUPLE_IN_##in_cnt in_list,             \
                                    IPC_TUPLE_OUT_##out_cnt out_list> {        \
    public:                                                                    \
-    enum { ID = (IPC_MESSAGE_START << 16) + __LINE__ };                       \
+    enum { ID = IPC_MESSAGE_ID() };                                           \
     msg_class(IPC_TYPE_IN_##in_cnt in_list                                    \
               IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)                     \
               IPC_TYPE_OUT_##out_cnt out_list);                               \
@@ -470,7 +470,7 @@
       public IPC::MessageWithReply<IPC_TUPLE_IN_##in_cnt in_list,             \
                                    IPC_TUPLE_OUT_##out_cnt out_list> {        \
    public:                                                                    \
-    enum { ID = (IPC_MESSAGE_START << 16) + __LINE__ };                       \
+    enum { ID = IPC_MESSAGE_ID() };                                           \
     msg_class(int32 routing_id                                                \
               IPC_COMMA_OR_##in_cnt(IPC_COMMA_##out_cnt)                      \
               IPC_TYPE_IN_##in_cnt in_list                                    \
@@ -671,6 +671,16 @@ LogFunctionMap g_log_function_mapping;
 #define IPC_COMMA_OR_4(x) ,
 #define IPC_COMMA_OR_5(x) ,
 
+// Message IDs
+// Note: we currently use __LINE__ to give unique IDs to messages within
+// a file.  They're globally unique since each file defines its own
+// IPC_MESSAGE_START.  Ideally, we wouldn't use line numbers (a possibility
+// is to instead use the __COUNTER__ macro, but it needs gcc 4.3 and xcode
+// doesn't use it yet).
+#define IPC_MESSAGE_ID() ((IPC_MESSAGE_START << 16) + __LINE__)
+#define IPC_MESSAGE_ID_CLASS(id) ((id) >> 16)
+#define IPC_MESSAGE_ID_LINE(id) ((id) & 0xffff)
+
 // Message crackers and handlers.
 // Prefer to use the IPC_BEGIN_MESSAGE_MAP_EX to the older macros since they
 // allow you to detect when a message could not be de-serialized. Usage:
@@ -754,7 +764,7 @@ LogFunctionMap g_log_function_mapping;
 
 // This corresponds to an enum value from IPCMessageStart.
 #define IPC_MESSAGE_CLASS(message) \
-  message.type() >> 16
+  IPC_MESSAGE_ID_CLASS(message.type())
 
 #endif  // IPC_IPC_MESSAGE_MACROS_H_
 
diff --git a/ipc/ipc_message_null_macros.h b/ipc/ipc_message_null_macros.h
index fb57df5..7cd02f5 100644
--- a/ipc/ipc_message_null_macros.h
+++ b/ipc/ipc_message_null_macros.h
@@ -14,78 +14,7 @@
 #undef IPC_STRUCT_TRAITS_PARENT
 #undef IPC_STRUCT_TRAITS_END
 #undef IPC_ENUM_TRAITS
-#undef IPC_MESSAGE_CONTROL0
-#undef IPC_MESSAGE_CONTROL1
-#undef IPC_MESSAGE_CONTROL2
-#undef IPC_MESSAGE_CONTROL3
-#undef IPC_MESSAGE_CONTROL4
-#undef IPC_MESSAGE_CONTROL5
-#undef IPC_MESSAGE_ROUTED0
-#undef IPC_MESSAGE_ROUTED1
-#undef IPC_MESSAGE_ROUTED2
-#undef IPC_MESSAGE_ROUTED3
-#undef IPC_MESSAGE_ROUTED4
-#undef IPC_MESSAGE_ROUTED5
-#undef IPC_SYNC_MESSAGE_CONTROL0_0
-#undef IPC_SYNC_MESSAGE_CONTROL0_1
-#undef IPC_SYNC_MESSAGE_CONTROL0_2
-#undef IPC_SYNC_MESSAGE_CONTROL0_3
-#undef IPC_SYNC_MESSAGE_CONTROL0_4
-#undef IPC_SYNC_MESSAGE_CONTROL1_0
-#undef IPC_SYNC_MESSAGE_CONTROL1_1
-#undef IPC_SYNC_MESSAGE_CONTROL1_2
-#undef IPC_SYNC_MESSAGE_CONTROL1_3
-#undef IPC_SYNC_MESSAGE_CONTROL1_4
-#undef IPC_SYNC_MESSAGE_CONTROL2_0
-#undef IPC_SYNC_MESSAGE_CONTROL2_1
-#undef IPC_SYNC_MESSAGE_CONTROL2_2
-#undef IPC_SYNC_MESSAGE_CONTROL2_3
-#undef IPC_SYNC_MESSAGE_CONTROL2_4
-#undef IPC_SYNC_MESSAGE_CONTROL3_0
-#undef IPC_SYNC_MESSAGE_CONTROL3_1
-#undef IPC_SYNC_MESSAGE_CONTROL3_2
-#undef IPC_SYNC_MESSAGE_CONTROL3_3
-#undef IPC_SYNC_MESSAGE_CONTROL3_4
-#undef IPC_SYNC_MESSAGE_CONTROL4_0
-#undef IPC_SYNC_MESSAGE_CONTROL4_1
-#undef IPC_SYNC_MESSAGE_CONTROL4_2
-#undef IPC_SYNC_MESSAGE_CONTROL4_3
-#undef IPC_SYNC_MESSAGE_CONTROL4_4
-#undef IPC_SYNC_MESSAGE_CONTROL5_0
-#undef IPC_SYNC_MESSAGE_CONTROL5_1
-#undef IPC_SYNC_MESSAGE_CONTROL5_2
-#undef IPC_SYNC_MESSAGE_CONTROL5_3
-#undef IPC_SYNC_MESSAGE_CONTROL5_4
-#undef IPC_SYNC_MESSAGE_ROUTED0_0
-#undef IPC_SYNC_MESSAGE_ROUTED0_1
-#undef IPC_SYNC_MESSAGE_ROUTED0_2
-#undef IPC_SYNC_MESSAGE_ROUTED0_3
-#undef IPC_SYNC_MESSAGE_ROUTED0_4
-#undef IPC_SYNC_MESSAGE_ROUTED1_0
-#undef IPC_SYNC_MESSAGE_ROUTED1_1
-#undef IPC_SYNC_MESSAGE_ROUTED1_2
-#undef IPC_SYNC_MESSAGE_ROUTED1_3
-#undef IPC_SYNC_MESSAGE_ROUTED1_4
-#undef IPC_SYNC_MESSAGE_ROUTED2_0
-#undef IPC_SYNC_MESSAGE_ROUTED2_1
-#undef IPC_SYNC_MESSAGE_ROUTED2_2
-#undef IPC_SYNC_MESSAGE_ROUTED2_3
-#undef IPC_SYNC_MESSAGE_ROUTED2_4
-#undef IPC_SYNC_MESSAGE_ROUTED3_0
-#undef IPC_SYNC_MESSAGE_ROUTED3_1
-#undef IPC_SYNC_MESSAGE_ROUTED3_2
-#undef IPC_SYNC_MESSAGE_ROUTED3_3
-#undef IPC_SYNC_MESSAGE_ROUTED3_4
-#undef IPC_SYNC_MESSAGE_ROUTED4_0
-#undef IPC_SYNC_MESSAGE_ROUTED4_1
-#undef IPC_SYNC_MESSAGE_ROUTED4_2
-#undef IPC_SYNC_MESSAGE_ROUTED4_3
-#undef IPC_SYNC_MESSAGE_ROUTED4_4
-#undef IPC_SYNC_MESSAGE_ROUTED5_0
-#undef IPC_SYNC_MESSAGE_ROUTED5_1
-#undef IPC_SYNC_MESSAGE_ROUTED5_2
-#undef IPC_SYNC_MESSAGE_ROUTED5_3
-#undef IPC_SYNC_MESSAGE_ROUTED5_4
+#undef IPC_MESSAGE_DECL
 
 #define IPC_STRUCT_BEGIN(struct_name)
 #define IPC_STRUCT_MEMBER(type, name)
@@ -95,75 +24,6 @@
 #define IPC_STRUCT_TRAITS_PARENT(type)
 #define IPC_STRUCT_TRAITS_END()
 #define IPC_ENUM_TRAITS(enum_name)
-#define IPC_MESSAGE_CONTROL0(msg_class)
-#define IPC_MESSAGE_CONTROL1(msg_class, type1)
-#define IPC_MESSAGE_CONTROL2(msg_class, type1, type2)
-#define IPC_MESSAGE_CONTROL3(msg_class, type1, type2, type3)
-#define IPC_MESSAGE_CONTROL4(msg_class, type1, type2, type3, type4)
-#define IPC_MESSAGE_CONTROL5(msg_class, type1, type2, type3, type4, type5)
-#define IPC_MESSAGE_ROUTED0(msg_class)
-#define IPC_MESSAGE_ROUTED1(msg_class, type1)
-#define IPC_MESSAGE_ROUTED2(msg_class, type1, type2)
-#define IPC_MESSAGE_ROUTED3(msg_class, type1, type2, type3)
-#define IPC_MESSAGE_ROUTED4(msg_class, type1, type2, type3, type4)
-#define IPC_MESSAGE_ROUTED5(msg_class, type1, type2, type3, type4, type5)
-#define IPC_SYNC_MESSAGE_CONTROL0_0(msg_class)
-#define IPC_SYNC_MESSAGE_CONTROL0_1(msg_class, type1_out)
-#define IPC_SYNC_MESSAGE_CONTROL0_2(msg_class, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_CONTROL0_3(msg_class, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_CONTROL0_4(msg_class, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_CONTROL1_0(msg_class, type1_in)
-#define IPC_SYNC_MESSAGE_CONTROL1_1(msg_class, type1_in, type1_out)
-#define IPC_SYNC_MESSAGE_CONTROL1_2(msg_class, type1_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_CONTROL1_3(msg_class, type1_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_CONTROL1_4(msg_class, type1_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_CONTROL2_0(msg_class, type1_in, type2_in)
-#define IPC_SYNC_MESSAGE_CONTROL2_1(msg_class, type1_in, type2_in, type1_out)
-#define IPC_SYNC_MESSAGE_CONTROL2_2(msg_class, type1_in, type2_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_CONTROL2_3(msg_class, type1_in, type2_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_CONTROL2_4(msg_class, type1_in, type2_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_CONTROL3_0(msg_class, type1_in, type2_in, type3_in)
-#define IPC_SYNC_MESSAGE_CONTROL3_1(msg_class, type1_in, type2_in, type3_in, type1_out)
-#define IPC_SYNC_MESSAGE_CONTROL3_2(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_CONTROL3_3(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_CONTROL3_4(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_CONTROL4_0(msg_class, type1_in, type2_in, type3_in, type4_in)
-#define IPC_SYNC_MESSAGE_CONTROL4_1(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out)
-#define IPC_SYNC_MESSAGE_CONTROL4_2(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_CONTROL4_3(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_CONTROL4_4(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_CONTROL5_0(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in)
-#define IPC_SYNC_MESSAGE_CONTROL5_1(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out)
-#define IPC_SYNC_MESSAGE_CONTROL5_2(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_CONTROL5_3(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_CONTROL5_4(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_ROUTED0_0(msg_class)
-#define IPC_SYNC_MESSAGE_ROUTED0_1(msg_class, type1_out)
-#define IPC_SYNC_MESSAGE_ROUTED0_2(msg_class, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_ROUTED0_3(msg_class, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_ROUTED0_4(msg_class, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_ROUTED1_0(msg_class, type1_in)
-#define IPC_SYNC_MESSAGE_ROUTED1_1(msg_class, type1_in, type1_out)
-#define IPC_SYNC_MESSAGE_ROUTED1_2(msg_class, type1_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_ROUTED1_3(msg_class, type1_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_ROUTED1_4(msg_class, type1_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_ROUTED2_0(msg_class, type1_in, type2_in)
-#define IPC_SYNC_MESSAGE_ROUTED2_1(msg_class, type1_in, type2_in, type1_out)
-#define IPC_SYNC_MESSAGE_ROUTED2_2(msg_class, type1_in, type2_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_ROUTED2_3(msg_class, type1_in, type2_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_ROUTED2_4(msg_class, type1_in, type2_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_ROUTED3_0(msg_class, type1_in, type2_in, type3_in)
-#define IPC_SYNC_MESSAGE_ROUTED3_1(msg_class, type1_in, type2_in, type3_in, type1_out)
-#define IPC_SYNC_MESSAGE_ROUTED3_2(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_ROUTED3_3(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_ROUTED3_4(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_ROUTED4_0(msg_class, type1_in, type2_in, type3_in, type4_in)
-#define IPC_SYNC_MESSAGE_ROUTED4_1(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out)
-#define IPC_SYNC_MESSAGE_ROUTED4_2(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_ROUTED4_3(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_ROUTED4_4(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out, type3_out, type4_out)
-#define IPC_SYNC_MESSAGE_ROUTED5_0(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in)
-#define IPC_SYNC_MESSAGE_ROUTED5_1(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out)
-#define IPC_SYNC_MESSAGE_ROUTED5_2(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out)
-#define IPC_SYNC_MESSAGE_ROUTED5_3(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out, type3_out)
-#define IPC_SYNC_MESSAGE_ROUTED5_4(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out, type3_out, type4_out)
+#define IPC_MESSAGE_DECL(sync, kind, msg_class, \
+                         in_cnt, out_cnt, in_list, out_list)
+
diff --git a/ipc/param_traits_log_macros.h b/ipc/param_traits_log_macros.h
index de2006c..8259a0d 100644
--- a/ipc/param_traits_log_macros.h
+++ b/ipc/param_traits_log_macros.h
@@ -4,6 +4,7 @@
 
 #ifndef IPC_PARAM_TRAITS_LOG_MACROS_H_
 #define IPC_PARAM_TRAITS_LOG_MACROS_H_
+#pragma once
 
 #include <string>
 
diff --git a/ipc/param_traits_read_macros.h b/ipc/param_traits_read_macros.h
index ffcdf8e..f0b88bc 100644
--- a/ipc/param_traits_read_macros.h
+++ b/ipc/param_traits_read_macros.h
@@ -4,6 +4,7 @@
 
 #ifndef IPC_PARAM_TRAITS_READ_MACROS_H_
 #define IPC_PARAM_TRAITS_READ_MACROS_H_
+#pragma once
 
 // Null out all the macros that need nulling.
 #include "ipc/ipc_message_null_macros.h"
diff --git a/ipc/param_traits_write_macros.h b/ipc/param_traits_write_macros.h
index 2ac5249..844c385 100644
--- a/ipc/param_traits_write_macros.h
+++ b/ipc/param_traits_write_macros.h
@@ -4,6 +4,7 @@
 
 #ifndef IPC_PARAM_TRAITS_WRITE_MACROS_H_
 #define IPC_PARAM_TRAITS_WRITE_MACROS_H_
+#pragma once
 
 // Null out all the macros that need nulling.
 #include "ipc/ipc_message_null_macros.h"