ipc/ipc_message_macros.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Defining IPC Messages
   6 //
   7 // Your IPC messages will be defined by macros inside of an XXX_messages.h
   8 // header file.  Most of the time, the system can automatically generate all
   9 // of messaging mechanism from these definitions, but sometimes some manual
  10 // coding is required.  In these cases, you will also have an XXX_messages.cc
  11 // implemation file as well.
  12 //
  13 // The senders of your messages will include your XXX_messages.h file to
  14 // get the full set of definitions they need to send your messages.
  15 //
  16 // Each XXX_messages.h file must be registered with the IPC system.  This
  17 // requires adding two things:
  18 //   - An XXXMsgStart value to the IPCMessageStart enum in ipc_message_start.h
  19 //   - An inclusion of XXX_messages.h file in a message generator .h file
  20 //
  21 // The XXXMsgStart value is an enumeration that ensures uniqueness for
  22 // each different message file.  Later, you will use this inside your
  23 // XXX_messages.h file before invoking message declaration macros:
  24 //     #define IPC_MESSAGE_START XXXMsgStart
  25 //       ( ... your macro invocations go here ... )
  26 //
  27 // Message Generator Files
  28 //
  29 // A message generator .h header file pulls in all other message-declaring
  30 // headers for a given component.  It is included by a message generator
  31 // .cc file, which is where all the generated code will wind up.  Typically,
  32 // you will use an existing generator (e.g. common_message_generator.cc
  33 // in /chrome/common), but there are circumstances where you may add a
  34 // new one.
  35 //
  36 // In the rare cicrucmstances where you can't re-use an existing file,
  37 // your YYY_message_generator.cc file for a component YYY would contain
  38 // the following code:
  39 //     // Get basic type definitions.
  40 //     #define IPC_MESSAGE_IMPL
  41 //     #include "path/to/YYY_message_generator.h"
  42 //     // Generate constructors.
  43 //     #include "ipc/struct_constructor_macros.h"
  44 //     #include "path/to/YYY_message_generator.h"
  45 //     // Generate destructors.
  46 //     #include "ipc/struct_destructor_macros.h"
  47 //     #include "path/to/YYY_message_generator.h"
  48 //     // Generate param traits write methods.
  49 //     #include "ipc/param_traits_write_macros.h"
  50 //     namespace IPC {
  51 //     #include "path/to/YYY_message_generator.h"
  52 //     }  // namespace IPC
  53 //     // Generate param traits read methods.
  54 //     #include "ipc/param_traits_read_macros.h"
  55 //     namespace IPC {
  56 //     #include "path/to/YYY_message_generator.h"
  57 //     }  // namespace IPC
  58 //     // Generate param traits log methods.
  59 //     #include "ipc/param_traits_log_macros.h"
  60 //     namespace IPC {
  61 //     #include "path/to/YYY_message_generator.h"
  62 //     }  // namespace IPC
  63 //
  64 // In cases where manual generation is required, in your XXX_messages.cc
  65 // file, put the following after all the includes for param types:
  66 //     #define IPC_MESSAGE_IMPL
  67 //     #include "XXX_messages.h"
  68 //        (... implementation of traits not auto-generated ...)
  69 //
  70 // Multiple Inclusion
  71 //
  72 // The XXX_messages.h file will be multiply-included by the
  73 // YYY_message_generator.cc file, so your XXX_messages file can't be
  74 // guarded in the usual manner.  Ideally, there will be no need for any
  75 // inclusion guard, since the XXX_messages.h file should consist soley
  76 // of inclusions of other headers (which are self-guarding) and IPC
  77 // macros (which are multiply evaluating).
  78 //
  79 // Note that #pragma once cannot be used here; doing so would mark the whole
  80 // file as being singly-included.  Since your XXX_messages.h file is only
  81 // partially-guarded, care must be taken to ensure that it is only included
  82 // by other .cc files (and the YYY_message_generator.h file).  Including an
  83 // XXX_messages.h file in some other .h file may result in duplicate
  84 // declarations and a compilation failure.
  85 //
  86 // Type Declarations
  87 //
  88 // It is generally a bad idea to have type definitions in a XXX_messages.h
  89 // file; most likely the typedef will then be used in the message, as opposed
  90 // to the struct iself.  Later, an IPC message dispatcher wil need to call
  91 // a function taking that type, and that function is declared in some other
  92 // header.  Thus, in order to get the type definition, the other header
  93 // would have to include the XXX_messages.h file, violating the rule above
  94 // about not including XXX_messages.h file in other .h files.
  95 //
  96 // One approach here is to move these type definitions to another (guarded)
  97 // .h file and include this second .h in your XXX_messages.h file.  This
  98 // is still less than ideal, because the dispatched function would have to
  99 // redeclare the typedef or include this second header.  This may be
 100 // reasonable in a few cases.
 101 //
 102 // Failing all of the above, then you will want to bracket the smallest
 103 // possible section of your XXX_messages.h file containing these types
 104 // with an include guard macro.  Be aware that providing an incomplete
 105 // class type declaration to avoid pulling in a long chain of headers is
 106 // acceptable when your XXX_messages.h header is being included by the
 107 // message sending caller's code, but not when the YYY_message_generator.c
 108 // is building the messages. In addtion, due to the multiple inclusion
 109 // restriction, these type ought to be guarded.  Follow a convention like:
 110 //      #ifndef SOME_GUARD_MACRO
 111 //      #define SOME_GUARD_MACRO
 112 //      class some_class;        // One incomplete class declaration
 113 //      class_some_other_class;  // Another incomplete class declaration
 114 //      #endif  // SOME_GUARD_MACRO
 115 //      #ifdef IPC_MESSAGE_IMPL
 116 //      #inlcude "path/to/some_class.h"        // Full class declaration
 117 //      #inlcude "path/to/some_other_class.h"  // Full class declaration
 118 //      #endif  // IPC_MESSAGE_IMPL
 119 //        (.. IPC macros using some_class and some_other_class ...)
 120 //
 121 // Macro Invocations
 122 //
 123 // You will use IPC message macro invocations for three things:
 124 //   - New struct definitions for IPC
 125 //   - Registering existing struct and enum definitions with IPC
 126 //   - Defining the messages themselves
 127 //
 128 // New structs are defined with IPC_STRUCT_BEGIN(), IPC_STRUCT_MEMBER(),
 129 // IPC_STRUCT_END() family of macros.  These cause the XXX_messages.h
 130 // to proclaim equivalent struct declarations for use by callers, as well
 131 // as later registering the type with the message generation.  Note that
 132 // IPC_STRUCT_MEMBER() is only permitted inside matching calls to
 133 // IPC_STRUCT_BEGIN() / IPC_STRUCT_END(). There is also an
 134 // IPC_STRUCT_BEGIN_WITH_PARENT(), which behaves like IPC_STRUCT_BEGIN(),
 135 // but also accomodates structs that inherit from other structs.
 136 //
 137 // Externally-defined structs are registered with IPC_STRUCT_TRAITS_BEGIN(),
 138 // IPC_STRUCT_TRAITS_MEMBER(), and IPC_STRUCT_TRAITS_END() macros. These
 139 // cause registration of the types with message generation only.
 140 // There's also IPC_STRUCT_TRAITS_PARENT, which is used to register a parent
 141 // class (whose own traits are already defined). Note that
 142 // IPC_STRUCT_TRAITS_MEMBER() and IPC_STRUCT_TRAITS_PARENT are only permitted
 143 // inside matching calls to IPC_STRUCT_TRAITS_BEGIN() /
 144 // IPC_STRUCT_TRAITS_END().
 145 //
 146 // Enum types are registered with a single IPC_ENUM_TRAITS_VALIDATE() macro.
 147 // There is no need to enumerate each value to the IPC mechanism. Instead,
 148 // pass an expression in terms of the parameter |value| to provide
 149 // range-checking.  For convenience, the IPC_ENUM_TRAITS() is provided which
 150 // performs no checking, passing everything including out-of-range values.
 151 // Its use is discouraged. The IPC_ENUM_TRAITS_MAX_VALUE() macro can be used
 152 // for the typical case where the enum must be in the range 0..maxvalue
 153 // inclusive. The IPC_ENUM_TRAITS_MIN_MAX_VALUE() macro can be used for the
 154 // less typical case where the enum must be in the range minvalue..maxvalue
 155 // inclusive.
 156 //
 157 // Do not place semicolons following these IPC_ macro invocations.  There
 158 // is no reason to expect that their expansion corresponds one-to-one with
 159 // C++ statements.
 160 //
 161 // Once the types have been declared / registered, message definitions follow.
 162 // "Sync" messages are just synchronous calls, the Send() call doesn't return
 163 // until a reply comes back.  To declare a sync message, use the IPC_SYNC_
 164 // macros.  The numbers at the end show how many input/output parameters there
 165 // are (i.e. 1_2 is 1 in, 2 out).  Input parameters are first, followed by
 166 // output parameters.  The caller uses Send([route id, ], in1, &out1, &out2).
 167 // The receiver's handler function will be
 168 //     void OnSyncMessageName(const type1& in1, type2* out1, type3* out2)
 169 //
 170 // A caller can also send a synchronous message, while the receiver can respond
 171 // at a later time.  This is transparent from the sender's side.  The receiver
 172 // needs to use a different handler that takes in a IPC::Message* as the output
 173 // type, stash the message, and when it has the data it can Send the message.
 174 //
 175 // Use the IPC_MESSAGE_HANDLER_DELAY_REPLY macro instead of IPC_MESSAGE_HANDLER
 176 //     IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_SyncMessageName,
 177 //                                     OnSyncMessageName)
 178 //
 179 // The handler function will look like:
 180 //     void OnSyncMessageName(const type1& in1, IPC::Message* reply_msg);
 181 //
 182 // Receiver stashes the IPC::Message* pointer, and when it's ready, it does:
 183 //     ViewHostMsg_SyncMessageName::WriteReplyParams(reply_msg, out1, out2);
 184 //     Send(reply_msg);
 185
 186 // Files that want to export their ipc messages should do
 187 //   #undef IPC_MESSAGE_EXPORT
 188 //   #define IPC_MESSAGE_EXPORT VISIBILITY_MACRO
 189 // after including this header, but before using any of the macros below.
 190 // (This needs to be before the include guard.)
 191 #undef IPC_MESSAGE_EXPORT
 192 #define IPC_MESSAGE_EXPORT
 193
 194 #ifndef IPC_IPC_MESSAGE_MACROS_H_
 195 #define IPC_IPC_MESSAGE_MACROS_H_
 196
 197 #include "base/profiler/scoped_profile.h"
 198 #include "ipc/ipc_message_utils.h"
 199 #include "ipc/param_traits_macros.h"
 200
 201 #if defined(IPC_MESSAGE_IMPL)
 202 #include "ipc/ipc_message_utils_impl.h"
 203 #endif
 204
 205 // Convenience macro for defining structs without inheritance. Should not need
 206 // to be subsequently redefined.
 207 #define IPC_STRUCT_BEGIN(struct_name) \
 208   IPC_STRUCT_BEGIN_WITH_PARENT(struct_name, IPC::NoParams)
 209
 210 // Macros for defining structs. Will be subsequently redefined.
 211 #define IPC_STRUCT_BEGIN_WITH_PARENT(struct_name, parent) \
 212   struct struct_name; \
 213   IPC_STRUCT_TRAITS_BEGIN(struct_name) \
 214   IPC_STRUCT_TRAITS_END() \
 215   struct IPC_MESSAGE_EXPORT struct_name : parent { \
 216     struct_name(); \
 217     ~struct_name();
 218 // Optional variadic parameters specify the default value for this struct
 219 // member. They are passed through to the constructor for |type|.
 220 #define IPC_STRUCT_MEMBER(type, name, ...) type name;
 221 #define IPC_STRUCT_END() };
 222
 223 // Message macros collect specific numbers of arguments and funnel them into
 224 // the common message generation macro.  These should never be redefined.
 225 #define IPC_MESSAGE_CONTROL0(msg_class) \
 226   IPC_MESSAGE_DECL(EMPTY, CONTROL, msg_class, 0, 0, (), ())
 227
 228 #define IPC_MESSAGE_CONTROL1(msg_class, type1) \
 229   IPC_MESSAGE_DECL(ASYNC, CONTROL, msg_class, 1, 0, (type1), ())
 230
 231 #define IPC_MESSAGE_CONTROL2(msg_class, type1, type2) \
 232   IPC_MESSAGE_DECL(ASYNC, CONTROL, msg_class, 2, 0, (type1, type2), ())
 233
 234 #define IPC_MESSAGE_CONTROL3(msg_class, type1, type2, type3) \
 235   IPC_MESSAGE_DECL(ASYNC, CONTROL, msg_class, 3, 0, (type1, type2, type3), ())
 236
 237 #define IPC_MESSAGE_CONTROL4(msg_class, type1, type2, type3, type4) \
 238   IPC_MESSAGE_DECL(ASYNC, CONTROL, msg_class, 4, 0, (type1, type2, type3, type4), ())
 239
 240 #define IPC_MESSAGE_CONTROL5(msg_class, type1, type2, type3, type4, type5) \
 241   IPC_MESSAGE_DECL(ASYNC, CONTROL, msg_class, 5, 0, (type1, type2, type3, type4, type5), ())
 242
 243 #define IPC_MESSAGE_ROUTED0(msg_class) \
 244   IPC_MESSAGE_DECL(EMPTY, ROUTED, msg_class, 0, 0, (), ())
 245
 246 #define IPC_MESSAGE_ROUTED1(msg_class, type1) \
 247   IPC_MESSAGE_DECL(ASYNC, ROUTED, msg_class, 1, 0, (type1), ())
 248
 249 #define IPC_MESSAGE_ROUTED2(msg_class, type1, type2) \
 250   IPC_MESSAGE_DECL(ASYNC, ROUTED, msg_class, 2, 0, (type1, type2), ())
 251
 252 #define IPC_MESSAGE_ROUTED3(msg_class, type1, type2, type3) \
 253   IPC_MESSAGE_DECL(ASYNC, ROUTED, msg_class, 3, 0, (type1, type2, type3), ())
 254
 255 #define IPC_MESSAGE_ROUTED4(msg_class, type1, type2, type3, type4) \
 256   IPC_MESSAGE_DECL(ASYNC, ROUTED, msg_class, 4, 0, (type1, type2, type3, type4), ())
 257
 258 #define IPC_MESSAGE_ROUTED5(msg_class, type1, type2, type3, type4, type5) \
 259   IPC_MESSAGE_DECL(ASYNC, ROUTED, msg_class, 5, 0, (type1, type2, type3, type4, type5), ())
 260
 261 #define IPC_SYNC_MESSAGE_CONTROL0_0(msg_class) \
 262   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 0, 0, (), ())
 263
 264 #define IPC_SYNC_MESSAGE_CONTROL0_1(msg_class, type1_out) \
 265   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 0, 1, (), (type1_out))
 266
 267 #define IPC_SYNC_MESSAGE_CONTROL0_2(msg_class, type1_out, type2_out) \
 268   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 0, 2, (), (type1_out, type2_out))
 269
 270 #define IPC_SYNC_MESSAGE_CONTROL0_3(msg_class, type1_out, type2_out, type3_out) \
 271   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 0, 3, (), (type1_out, type2_out, type3_out))
 272
 273 #define IPC_SYNC_MESSAGE_CONTROL0_4(msg_class, type1_out, type2_out, type3_out, type4_out) \
 274   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 0, 4, (), (type1_out, type2_out, type3_out, type4_out))
 275
 276 #define IPC_SYNC_MESSAGE_CONTROL1_0(msg_class, type1_in) \
 277   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 1, 0, (type1_in), ())
 278
 279 #define IPC_SYNC_MESSAGE_CONTROL1_1(msg_class, type1_in, type1_out) \
 280   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 1, 1, (type1_in), (type1_out))
 281
 282 #define IPC_SYNC_MESSAGE_CONTROL1_2(msg_class, type1_in, type1_out, type2_out) \
 283   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 1, 2, (type1_in), (type1_out, type2_out))
 284
 285 #define IPC_SYNC_MESSAGE_CONTROL1_3(msg_class, type1_in, type1_out, type2_out, type3_out) \
 286   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 1, 3, (type1_in), (type1_out, type2_out, type3_out))
 287
 288 #define IPC_SYNC_MESSAGE_CONTROL1_4(msg_class, type1_in, type1_out, type2_out, type3_out, type4_out) \
 289   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 1, 4, (type1_in), (type1_out, type2_out, type3_out, type4_out))
 290
 291 #define IPC_SYNC_MESSAGE_CONTROL2_0(msg_class, type1_in, type2_in) \
 292   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 2, 0, (type1_in, type2_in), ())
 293
 294 #define IPC_SYNC_MESSAGE_CONTROL2_1(msg_class, type1_in, type2_in, type1_out) \
 295   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 2, 1, (type1_in, type2_in), (type1_out))
 296
 297 #define IPC_SYNC_MESSAGE_CONTROL2_2(msg_class, type1_in, type2_in, type1_out, type2_out) \
 298   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 2, 2, (type1_in, type2_in), (type1_out, type2_out))
 299
 300 #define IPC_SYNC_MESSAGE_CONTROL2_3(msg_class, type1_in, type2_in, type1_out, type2_out, type3_out) \
 301   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 2, 3, (type1_in, type2_in), (type1_out, type2_out, type3_out))
 302
 303 #define IPC_SYNC_MESSAGE_CONTROL2_4(msg_class, type1_in, type2_in, type1_out, type2_out, type3_out, type4_out) \
 304   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 2, 4, (type1_in, type2_in), (type1_out, type2_out, type3_out, type4_out))
 305
 306 #define IPC_SYNC_MESSAGE_CONTROL3_0(msg_class, type1_in, type2_in, type3_in) \
 307   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 3, 0, (type1_in, type2_in, type3_in), ())
 308
 309 #define IPC_SYNC_MESSAGE_CONTROL3_1(msg_class, type1_in, type2_in, type3_in, type1_out) \
 310   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 3, 1, (type1_in, type2_in, type3_in), (type1_out))
 311
 312 #define IPC_SYNC_MESSAGE_CONTROL3_2(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out) \
 313   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 3, 2, (type1_in, type2_in, type3_in), (type1_out, type2_out))
 314
 315 #define IPC_SYNC_MESSAGE_CONTROL3_3(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out, type3_out) \
 316   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 3, 3, (type1_in, type2_in, type3_in), (type1_out, type2_out, type3_out))
 317
 318 #define IPC_SYNC_MESSAGE_CONTROL3_4(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out, type3_out, type4_out) \
 319   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 3, 4, (type1_in, type2_in, type3_in), (type1_out, type2_out, type3_out, type4_out))
 320
 321 #define IPC_SYNC_MESSAGE_CONTROL4_0(msg_class, type1_in, type2_in, type3_in, type4_in) \
 322   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 4, 0, (type1_in, type2_in, type3_in, type4_in), ())
 323
 324 #define IPC_SYNC_MESSAGE_CONTROL4_1(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out) \
 325   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 4, 1, (type1_in, type2_in, type3_in, type4_in), (type1_out))
 326
 327 #define IPC_SYNC_MESSAGE_CONTROL4_2(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out) \
 328   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 4, 2, (type1_in, type2_in, type3_in, type4_in), (type1_out, type2_out))
 329
 330 #define IPC_SYNC_MESSAGE_CONTROL4_3(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out, type3_out) \
 331   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 4, 3, (type1_in, type2_in, type3_in, type4_in), (type1_out, type2_out, type3_out))
 332
 333 #define IPC_SYNC_MESSAGE_CONTROL4_4(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out, type3_out, type4_out) \
 334   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 4, 4, (type1_in, type2_in, type3_in, type4_in), (type1_out, type2_out, type3_out, type4_out))
 335
 336 #define IPC_SYNC_MESSAGE_CONTROL5_0(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in) \
 337   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 5, 0, (type1_in, type2_in, type3_in, type4_in, type5_in), ())
 338
 339 #define IPC_SYNC_MESSAGE_CONTROL5_1(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out) \
 340   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 5, 1, (type1_in, type2_in, type3_in, type4_in, type5_in), (type1_out))
 341
 342 #define IPC_SYNC_MESSAGE_CONTROL5_2(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out) \
 343   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 5, 2, (type1_in, type2_in, type3_in, type4_in, type5_in), (type1_out, type2_out))
 344
 345 #define IPC_SYNC_MESSAGE_CONTROL5_3(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out, type3_out) \
 346   IPC_MESSAGE_DECL(SYNC, CONTROL, msg_class, 5, 3, (type1_in, type2_in, type3_in, type4_in, type5_in), (type1_out, type2_out, type3_out))
 347
 348 #define IPC_SYNC_MESSAGE_ROUTED0_0(msg_class) \
 349   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 0, 0, (), ())
 350
 351 #define IPC_SYNC_MESSAGE_ROUTED0_1(msg_class, type1_out) \
 352   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 0, 1, (), (type1_out))
 353
 354 #define IPC_SYNC_MESSAGE_ROUTED0_2(msg_class, type1_out, type2_out) \
 355   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 0, 2, (), (type1_out, type2_out))
 356
 357 #define IPC_SYNC_MESSAGE_ROUTED0_3(msg_class, type1_out, type2_out, type3_out) \
 358   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 0, 3, (), (type1_out, type2_out, type3_out))
 359
 360 #define IPC_SYNC_MESSAGE_ROUTED0_4(msg_class, type1_out, type2_out, type3_out, type4_out) \
 361   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 0, 4, (), (type1_out, type2_out, type3_out, type4_out))
 362
 363 #define IPC_SYNC_MESSAGE_ROUTED1_0(msg_class, type1_in) \
 364   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 1, 0, (type1_in), ())
 365
 366 #define IPC_SYNC_MESSAGE_ROUTED1_1(msg_class, type1_in, type1_out) \
 367   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 1, 1, (type1_in), (type1_out))
 368
 369 #define IPC_SYNC_MESSAGE_ROUTED1_2(msg_class, type1_in, type1_out, type2_out) \
 370   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 1, 2, (type1_in), (type1_out, type2_out))
 371
 372 #define IPC_SYNC_MESSAGE_ROUTED1_3(msg_class, type1_in, type1_out, type2_out, type3_out) \
 373   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 1, 3, (type1_in), (type1_out, type2_out, type3_out))
 374
 375 #define IPC_SYNC_MESSAGE_ROUTED1_4(msg_class, type1_in, type1_out, type2_out, type3_out, type4_out) \
 376   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 1, 4, (type1_in), (type1_out, type2_out, type3_out, type4_out))
 377
 378 #define IPC_SYNC_MESSAGE_ROUTED2_0(msg_class, type1_in, type2_in) \
 379   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 2, 0, (type1_in, type2_in), ())
 380
 381 #define IPC_SYNC_MESSAGE_ROUTED2_1(msg_class, type1_in, type2_in, type1_out) \
 382   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 2, 1, (type1_in, type2_in), (type1_out))
 383
 384 #define IPC_SYNC_MESSAGE_ROUTED2_2(msg_class, type1_in, type2_in, type1_out, type2_out) \
 385   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 2, 2, (type1_in, type2_in), (type1_out, type2_out))
 386
 387 #define IPC_SYNC_MESSAGE_ROUTED2_3(msg_class, type1_in, type2_in, type1_out, type2_out, type3_out) \
 388   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 2, 3, (type1_in, type2_in), (type1_out, type2_out, type3_out))
 389
 390 #define IPC_SYNC_MESSAGE_ROUTED2_4(msg_class, type1_in, type2_in, type1_out, type2_out, type3_out, type4_out) \
 391   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 2, 4, (type1_in, type2_in), (type1_out, type2_out, type3_out, type4_out))
 392
 393 #define IPC_SYNC_MESSAGE_ROUTED3_0(msg_class, type1_in, type2_in, type3_in) \
 394   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 3, 0, (type1_in, type2_in, type3_in), ())
 395
 396 #define IPC_SYNC_MESSAGE_ROUTED3_1(msg_class, type1_in, type2_in, type3_in, type1_out) \
 397   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 3, 1, (type1_in, type2_in, type3_in), (type1_out))
 398
 399 #define IPC_SYNC_MESSAGE_ROUTED3_2(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out) \
 400   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 3, 2, (type1_in, type2_in, type3_in), (type1_out, type2_out))
 401
 402 #define IPC_SYNC_MESSAGE_ROUTED3_3(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out, type3_out) \
 403   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 3, 3, (type1_in, type2_in, type3_in), (type1_out, type2_out, type3_out))
 404
 405 #define IPC_SYNC_MESSAGE_ROUTED3_4(msg_class, type1_in, type2_in, type3_in, type1_out, type2_out, type3_out, type4_out) \
 406   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 3, 4, (type1_in, type2_in, type3_in), (type1_out, type2_out, type3_out, type4_out))
 407
 408 #define IPC_SYNC_MESSAGE_ROUTED4_0(msg_class, type1_in, type2_in, type3_in, type4_in) \
 409   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 4, 0, (type1_in, type2_in, type3_in, type4_in), ())
 410
 411 #define IPC_SYNC_MESSAGE_ROUTED4_1(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out) \
 412   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 4, 1, (type1_in, type2_in, type3_in, type4_in), (type1_out))
 413
 414 #define IPC_SYNC_MESSAGE_ROUTED4_2(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out) \
 415   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 4, 2, (type1_in, type2_in, type3_in, type4_in), (type1_out, type2_out))
 416
 417 #define IPC_SYNC_MESSAGE_ROUTED4_3(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out, type3_out) \
 418   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 4, 3, (type1_in, type2_in, type3_in, type4_in), (type1_out, type2_out, type3_out))
 419
 420 #define IPC_SYNC_MESSAGE_ROUTED4_4(msg_class, type1_in, type2_in, type3_in, type4_in, type1_out, type2_out, type3_out, type4_out) \
 421   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 4, 4, (type1_in, type2_in, type3_in, type4_in), (type1_out, type2_out, type3_out, type4_out))
 422
 423 #define IPC_SYNC_MESSAGE_ROUTED5_0(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in) \
 424   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 5, 0, (type1_in, type2_in, type3_in, type4_in, type5_in), ())
 425
 426 #define IPC_SYNC_MESSAGE_ROUTED5_1(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out) \
 427   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 5, 1, (type1_in, type2_in, type3_in, type4_in, type5_in), (type1_out))
 428
 429 #define IPC_SYNC_MESSAGE_ROUTED5_2(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out) \
 430   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 5, 2, (type1_in, type2_in, type3_in, type4_in, type5_in), (type1_out, type2_out))
 431
 432 #define IPC_SYNC_MESSAGE_ROUTED5_3(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out, type3_out) \
 433   IPC_MESSAGE_DECL(SYNC, ROUTED, msg_class, 5, 3, (type1_in, type2_in, type3_in, type4_in, type5_in), (type1_out, type2_out, type3_out))
 434
 435 // The following macros define the common set of methods provided by ASYNC
 436 // message classes.
 437 // This macro is for all the async IPCs that don't pass an extra parameter using
 438 // IPC_BEGIN_MESSAGE_MAP_WITH_PARAM.
 439 #define IPC_ASYNC_MESSAGE_METHODS_GENERIC                                     \
 440   template<class T, class S, class P, class Method>                           \
 441   static bool Dispatch(const Message* msg, T* obj, S* sender, P* parameter,   \
 442                        Method func) {                                         \
 443     Schema::Param p;                                                          \
 444     if (Read(msg, &p)) {                                                      \
 445       DispatchToMethod(obj, func, p);                                         \
 446       return true;                                                            \
 447     }                                                                         \
 448     return false;                                                             \
 449   }
 450
 451 // The following macros are for for async IPCs which have a dispatcher with an
 452 // extra parameter specified using IPC_BEGIN_MESSAGE_MAP_WITH_PARAM.
 453 #define IPC_ASYNC_MESSAGE_METHODS_1                                           \
 454   IPC_ASYNC_MESSAGE_METHODS_GENERIC                                           \
 455   template<class T, class S, class P, typename TA>                            \
 456   static bool Dispatch(const Message* msg, T* obj, S* sender, P* parameter,   \
 457                        void (T::*func)(P*, TA)) {                             \
 458     Schema::Param p;                                                          \
 459     if (Read(msg, &p)) {                                                      \
 460       (obj->*func)(parameter, p.a);                                           \
 461       return true;                                                            \
 462     }                                                                         \
 463     return false;                                                             \
 464   }
 465 #define IPC_ASYNC_MESSAGE_METHODS_2                                           \
 466   IPC_ASYNC_MESSAGE_METHODS_GENERIC                                           \
 467   template<class T, class S, class P, typename TA, typename TB>               \
 468   static bool Dispatch(const Message* msg, T* obj, S* sender, P* parameter,   \
 469                        void (T::*func)(P*, TA, TB)) {                         \
 470     Schema::Param p;                                                          \
 471     if (Read(msg, &p)) {                                                      \
 472       (obj->*func)(parameter, p.a, p.b);                                      \
 473       return true;                                                            \
 474     }                                                                         \
 475     return false;                                                             \
 476   }
 477 #define IPC_ASYNC_MESSAGE_METHODS_3                                           \
 478   IPC_ASYNC_MESSAGE_METHODS_GENERIC                                           \
 479   template<class T, class S, class P, typename TA, typename TB, typename TC>  \
 480   static bool Dispatch(const Message* msg, T* obj, S* sender, P* parameter,   \
 481                        void (T::*func)(P*, TA, TB, TC)) {                     \
 482     Schema::Param p;                                                          \
 483     if (Read(msg, &p)) {                                                      \
 484       (obj->*func)(parameter, p.a, p.b, p.c);                                 \
 485       return true;                                                            \
 486     }                                                                         \
 487     return false;                                                             \
 488   }
 489 #define IPC_ASYNC_MESSAGE_METHODS_4                                           \
 490   IPC_ASYNC_MESSAGE_METHODS_GENERIC                                           \
 491   template<class T, class S, class P, typename TA, typename TB, typename TC,  \
 492            typename TD>                                                       \
 493   static bool Dispatch(const Message* msg, T* obj, S* sender, P* parameter,   \
 494                        void (T::*func)(P*, TA, TB, TC, TD)) {                 \
 495     Schema::Param p;                                                          \
 496     if (Read(msg, &p)) {                                                      \
 497       (obj->*func)(parameter, p.a, p.b, p.c, p.d);                            \
 498       return true;                                                            \
 499     }                                                                         \
 500     return false;                                                             \
 501   }
 502 #define IPC_ASYNC_MESSAGE_METHODS_5                                           \
 503   IPC_ASYNC_MESSAGE_METHODS_GENERIC                                           \
 504   template<class T, class S, class P, typename TA, typename TB, typename TC,  \
 505            typename TD, typename TE>                                          \
 506   static bool Dispatch(const Message* msg, T* obj, S* sender, P* parameter,   \
 507                        void (T::*func)(P*, TA, TB, TC, TD, TE)) {             \
 508     Schema::Param p;                                                          \
 509     if (Read(msg, &p)) {                                                      \
 510       (obj->*func)(parameter, p.a, p.b, p.c, p.d, p.e);                       \
 511       return true;                                                            \
 512     }                                                                         \
 513     return false;                                                             \
 514   }
 515
 516 // The following macros define the common set of methods provided by SYNC
 517 // message classes.
 518 #define IPC_SYNC_MESSAGE_METHODS_GENERIC                                      \
 519   template<class T, class S, class P, class Method>                           \
 520   static bool Dispatch(const Message* msg, T* obj, S* sender, P* parameter,   \
 521                        Method func) {                                         \
 522     Schema::SendParam send_params;                                            \
 523     bool ok = ReadSendParam(msg, &send_params);                               \
 524     return Schema::DispatchWithSendParams(ok, send_params, msg, obj, sender,  \
 525                                           func);                              \
 526   }                                                                           \
 527   template<class T, class P, class Method>                                    \
 528   static bool DispatchDelayReply(const Message* msg, T* obj, P* parameter,    \
 529                                  Method func) {                               \
 530     Schema::SendParam send_params;                                            \
 531     bool ok = ReadSendParam(msg, &send_params);                               \
 532     return Schema::DispatchDelayReplyWithSendParams(ok, send_params, msg,     \
 533                                                     obj, func);               \
 534   }
 535 #define IPC_SYNC_MESSAGE_METHODS_0 \
 536   IPC_SYNC_MESSAGE_METHODS_GENERIC
 537 #define IPC_SYNC_MESSAGE_METHODS_1 \
 538   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 539   template<typename TA> \
 540   static void WriteReplyParams(Message* reply, TA a) { \
 541     Schema::WriteReplyParams(reply, a); \
 542   }
 543 #define IPC_SYNC_MESSAGE_METHODS_2 \
 544   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 545   template<typename TA, typename TB> \
 546   static void WriteReplyParams(Message* reply, TA a, TB b) { \
 547     Schema::WriteReplyParams(reply, a, b); \
 548   }
 549 #define IPC_SYNC_MESSAGE_METHODS_3 \
 550   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 551   template<typename TA, typename TB, typename TC> \
 552   static void WriteReplyParams(Message* reply, TA a, TB b, TC c) { \
 553     Schema::WriteReplyParams(reply, a, b, c); \
 554   }
 555 #define IPC_SYNC_MESSAGE_METHODS_4 \
 556   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 557   template<typename TA, typename TB, typename TC, typename TD> \
 558   static void WriteReplyParams(Message* reply, TA a, TB b, TC c, TD d) { \
 559     Schema::WriteReplyParams(reply, a, b, c, d); \
 560   }
 561 #define IPC_SYNC_MESSAGE_METHODS_5 \
 562   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 563   template<typename TA, typename TB, typename TC, typename TD, typename TE> \
 564   static void WriteReplyParams(Message* reply, TA a, TB b, TC c, TD d, TE e) { \
 565     Schema::WriteReplyParams(reply, a, b, c, d, e); \
 566   }
 567
 568 // Common message macro which dispatches into one of the 6 (sync x kind)
 569 // routines.  There is a way that these 6 cases can be lumped together,
 570 // but the  macros get very complicated in that case.
 571 // Note: intended be redefined to generate other information.
 572 #define IPC_MESSAGE_DECL(sync, kind, msg_class,                               \
 573                          in_cnt, out_cnt, in_list, out_list)                  \
 574   IPC_##sync##_##kind##_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
 575   IPC_MESSAGE_EXTRA(sync, kind, msg_class, in_cnt, out_cnt, in_list, out_list)
 576
 577 #define IPC_EMPTY_CONTROL_DECL(msg_class, in_cnt, out_cnt, in_list, out_list) \
 578   class IPC_MESSAGE_EXPORT msg_class : public IPC::Message {                  \
 579    public:                                                                    \
 580     typedef IPC::Message Schema;                                              \
 581     enum { ID = IPC_MESSAGE_ID() };                                           \
 582     msg_class() : IPC::Message(MSG_ROUTING_CONTROL, ID, PRIORITY_NORMAL) {}   \
 583     static void Log(std::string* name, const Message* msg, std::string* l);   \
 584   };
 585
 586 #define IPC_EMPTY_ROUTED_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 587   class IPC_MESSAGE_EXPORT msg_class : public IPC::Message {                  \
 588    public:                                                                    \
 589     typedef IPC::Message Schema;                                              \
 590     enum { ID = IPC_MESSAGE_ID() };                                           \
 591     msg_class(int32 routing_id)                                               \
 592         : IPC::Message(routing_id, ID, PRIORITY_NORMAL) {}                    \
 593     static void Log(std::string* name, const Message* msg, std::string* l);   \
 594   };
 595
 596 #define IPC_ASYNC_CONTROL_DECL(msg_class, in_cnt, out_cnt, in_list, out_list) \
 597   class IPC_MESSAGE_EXPORT msg_class : public IPC::Message {                  \
 598    public:                                                                    \
 599     typedef IPC::MessageSchema<IPC_TUPLE_IN_##in_cnt in_list> Schema;         \
 600     typedef Schema::Param Param;                                              \
 601     enum { ID = IPC_MESSAGE_ID() };                                           \
 602     msg_class(IPC_TYPE_IN_##in_cnt in_list);                                  \
 603     virtual ~msg_class();                                                     \
 604     static bool Read(const Message* msg, Schema::Param* p);                   \
 605     static void Log(std::string* name, const Message* msg, std::string* l);   \
 606     IPC_ASYNC_MESSAGE_METHODS_##in_cnt                                        \
 607   };
 608
 609 #define IPC_ASYNC_ROUTED_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 610   class IPC_MESSAGE_EXPORT msg_class : public IPC::Message {                  \
 611    public:                                                                    \
 612     typedef IPC::MessageSchema<IPC_TUPLE_IN_##in_cnt in_list> Schema;         \
 613     typedef Schema::Param Param;                                              \
 614     enum { ID = IPC_MESSAGE_ID() };                                           \
 615     msg_class(int32 routing_id IPC_COMMA_##in_cnt                             \
 616               IPC_TYPE_IN_##in_cnt in_list);                                  \
 617     virtual ~msg_class();                                                     \
 618     static bool Read(const Message* msg, Schema::Param* p);                   \
 619     static void Log(std::string* name, const Message* msg, std::string* l);   \
 620     IPC_ASYNC_MESSAGE_METHODS_##in_cnt                                        \
 621   };
 622
 623 #define IPC_SYNC_CONTROL_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 624   class IPC_MESSAGE_EXPORT msg_class : public IPC::SyncMessage {              \
 625    public:                                                                    \
 626     typedef IPC::SyncMessageSchema<IPC_TUPLE_IN_##in_cnt in_list,             \
 627                                    IPC_TUPLE_OUT_##out_cnt out_list> Schema;  \
 628     typedef Schema::ReplyParam ReplyParam;                                    \
 629     typedef Schema::SendParam SendParam;                                      \
 630     enum { ID = IPC_MESSAGE_ID() };                                           \
 631     msg_class(IPC_TYPE_IN_##in_cnt in_list                                    \
 632               IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)                     \
 633               IPC_TYPE_OUT_##out_cnt out_list);                               \
 634     virtual ~msg_class();                                                     \
 635     static bool ReadSendParam(const Message* msg, Schema::SendParam* p);      \
 636     static bool ReadReplyParam(                                               \
 637         const Message* msg,                                                   \
 638         TupleTypes<ReplyParam>::ValueTuple* p);                               \
 639     static void Log(std::string* name, const Message* msg, std::string* l);   \
 640     IPC_SYNC_MESSAGE_METHODS_##out_cnt                                        \
 641   };
 642
 643 #define IPC_SYNC_ROUTED_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
 644   class IPC_MESSAGE_EXPORT msg_class : public IPC::SyncMessage {              \
 645    public:                                                                    \
 646     typedef IPC::SyncMessageSchema<IPC_TUPLE_IN_##in_cnt in_list,             \
 647                                    IPC_TUPLE_OUT_##out_cnt out_list> Schema;  \
 648     typedef Schema::ReplyParam ReplyParam;                                    \
 649     typedef Schema::SendParam SendParam;                                      \
 650     enum { ID = IPC_MESSAGE_ID() };                                           \
 651     msg_class(int32 routing_id                                                \
 652               IPC_COMMA_OR_##in_cnt(IPC_COMMA_##out_cnt)                      \
 653               IPC_TYPE_IN_##in_cnt in_list                                    \
 654               IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)                     \
 655               IPC_TYPE_OUT_##out_cnt out_list);                               \
 656     virtual ~msg_class();                                                     \
 657     static bool ReadSendParam(const Message* msg, Schema::SendParam* p);      \
 658     static bool ReadReplyParam(                                               \
 659         const Message* msg,                                                   \
 660         TupleTypes<ReplyParam>::ValueTuple* p);                               \
 661     static void Log(std::string* name, const Message* msg, std::string* l);   \
 662     IPC_SYNC_MESSAGE_METHODS_##out_cnt                                        \
 663   };
 664
 665 #if defined(IPC_MESSAGE_IMPL)
 666
 667 // "Implementation" inclusion produces constructors, destructors, and
 668 // logging functions, except for the no-arg special cases, where the
 669 // implementation occurs in the declaration, and there is no special
 670 // logging function.
 671 #define IPC_MESSAGE_EXTRA(sync, kind, msg_class,                              \
 672                           in_cnt, out_cnt, in_list, out_list)                 \
 673   IPC_##sync##_##kind##_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
 674   IPC_##sync##_MESSAGE_LOG(msg_class)
 675
 676 #define IPC_EMPTY_CONTROL_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)
 677 #define IPC_EMPTY_ROUTED_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)
 678
 679 #define IPC_ASYNC_CONTROL_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list) \
 680   msg_class::msg_class(IPC_TYPE_IN_##in_cnt in_list) :                        \
 681       IPC::Message(MSG_ROUTING_CONTROL, ID, PRIORITY_NORMAL) {                \
 682         Schema::Write(this, IPC_NAME_IN_##in_cnt in_list);                    \
 683       }                                                                       \
 684   msg_class::~msg_class() {}                                                  \
 685   bool msg_class::Read(const Message* msg, Schema::Param* p) {                \
 686     return Schema::Read(msg, p);                                              \
 687   }
 688
 689 #define IPC_ASYNC_ROUTED_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 690   msg_class::msg_class(int32 routing_id IPC_COMMA_##in_cnt                    \
 691                        IPC_TYPE_IN_##in_cnt in_list) :                        \
 692       IPC::Message(routing_id, ID, PRIORITY_NORMAL) {                         \
 693         Schema::Write(this, IPC_NAME_IN_##in_cnt in_list);                    \
 694       }                                                                       \
 695   msg_class::~msg_class() {}                                                  \
 696   bool msg_class::Read(const Message* msg, Schema::Param* p) {                \
 697     return Schema::Read(msg, p);                                              \
 698   }
 699
 700 #define IPC_SYNC_CONTROL_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 701   msg_class::msg_class(IPC_TYPE_IN_##in_cnt in_list                           \
 702                        IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)            \
 703                        IPC_TYPE_OUT_##out_cnt out_list) :                     \
 704       IPC::SyncMessage(MSG_ROUTING_CONTROL, ID, PRIORITY_NORMAL,              \
 705                        new IPC::ParamDeserializer<Schema::ReplyParam>(        \
 706                            IPC_NAME_OUT_##out_cnt out_list)) {                \
 707         Schema::Write(this, IPC_NAME_IN_##in_cnt in_list);                    \
 708       }                                                                       \
 709   msg_class::~msg_class() {}                                                  \
 710   bool msg_class::ReadSendParam(const Message* msg, Schema::SendParam* p) {   \
 711     return Schema::ReadSendParam(msg, p);                                     \
 712   }                                                                           \
 713   bool msg_class::ReadReplyParam(const Message* msg,                          \
 714                                  TupleTypes<ReplyParam>::ValueTuple* p) {     \
 715     return Schema::ReadReplyParam(msg, p);                                    \
 716   }
 717
 718 #define IPC_SYNC_ROUTED_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
 719   msg_class::msg_class(int32 routing_id                                       \
 720                        IPC_COMMA_OR_##in_cnt(IPC_COMMA_##out_cnt)             \
 721                        IPC_TYPE_IN_##in_cnt in_list                           \
 722                        IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)            \
 723                        IPC_TYPE_OUT_##out_cnt out_list) :                     \
 724       IPC::SyncMessage(routing_id, ID, PRIORITY_NORMAL,                       \
 725                        new IPC::ParamDeserializer<Schema::ReplyParam>(        \
 726                            IPC_NAME_OUT_##out_cnt out_list)) {                \
 727         Schema::Write(this, IPC_NAME_IN_##in_cnt in_list);                    \
 728       }                                                                       \
 729   msg_class::~msg_class() {}                                                  \
 730   bool msg_class::ReadSendParam(const Message* msg, Schema::SendParam* p) {   \
 731     return Schema::ReadSendParam(msg, p);                                     \
 732   }                                                                           \
 733   bool msg_class::ReadReplyParam(const Message* msg,                          \
 734                                  TupleTypes<ReplyParam>::ValueTuple* p) {     \
 735     return Schema::ReadReplyParam(msg, p);                                    \
 736   }
 737
 738 #define IPC_EMPTY_MESSAGE_LOG(msg_class)                                \
 739   void msg_class::Log(std::string* name,                                \
 740                       const Message* msg,                               \
 741                       std::string* l) {                                 \
 742     if (name)                                                           \
 743       *name = #msg_class;                                               \
 744   }
 745
 746 #define IPC_ASYNC_MESSAGE_LOG(msg_class)                                \
 747   void msg_class::Log(std::string* name,                                \
 748                       const Message* msg,                               \
 749                       std::string* l) {                                 \
 750     if (name)                                                           \
 751       *name = #msg_class;                                               \
 752     if (!msg || !l)                                                     \
 753       return;                                                           \
 754     Schema::Param p;                                                    \
 755     if (Schema::Read(msg, &p))                                          \
 756       IPC::LogParam(p, l);                                              \
 757   }
 758
 759 #define IPC_SYNC_MESSAGE_LOG(msg_class)                                 \
 760   void msg_class::Log(std::string* name,                                \
 761                       const Message* msg,                               \
 762                       std::string* l) {                                 \
 763     if (name)                                                           \
 764       *name = #msg_class;                                               \
 765     if (!msg || !l)                                                     \
 766       return;                                                           \
 767     if (msg->is_sync()) {                                               \
 768       TupleTypes<Schema::SendParam>::ValueTuple p;                      \
 769       if (Schema::ReadSendParam(msg, &p))                               \
 770         IPC::LogParam(p, l);                                            \
 771       AddOutputParamsToLog(msg, l);                                     \
 772     } else {                                                            \
 773       TupleTypes<Schema::ReplyParam>::ValueTuple p;                     \
 774       if (Schema::ReadReplyParam(msg, &p))                              \
 775         IPC::LogParam(p, l);                                            \
 776     }                                                                   \
 777   }
 778
 779 #elif defined(IPC_MESSAGE_MACROS_LOG_ENABLED)
 780
 781 #ifndef IPC_LOG_TABLE_ADD_ENTRY
 782 #error You need to define IPC_LOG_TABLE_ADD_ENTRY(msg_id, logger)
 783 #endif
 784
 785 // "Log table" inclusion produces extra logging registration code.
 786 #define IPC_MESSAGE_EXTRA(sync, kind, msg_class,                        \
 787                           in_cnt, out_cnt, in_list, out_list)           \
 788   class LoggerRegisterHelper##msg_class {                               \
 789  public:                                                                \
 790     LoggerRegisterHelper##msg_class() {                                 \
 791       const uint32 msg_id = static_cast<uint32>(msg_class::ID);         \
 792       IPC_LOG_TABLE_ADD_ENTRY(msg_id, msg_class::Log);                  \
 793     }                                                                   \
 794   };                                                                    \
 795   LoggerRegisterHelper##msg_class g_LoggerRegisterHelper##msg_class;
 796
 797 #else
 798
 799 // Normal inclusion produces nothing extra.
 800 #define IPC_MESSAGE_EXTRA(sync, kind, msg_class,                \
 801                           in_cnt, out_cnt, in_list, out_list)
 802
 803 #endif // defined(IPC_MESSAGE_IMPL)
 804
 805 // Handle variable sized argument lists.  These are usually invoked by token
 806 // pasting against the argument counts.
 807 #define IPC_TYPE_IN_0()
 808 #define IPC_TYPE_IN_1(t1)                   const t1& arg1
 809 #define IPC_TYPE_IN_2(t1, t2)               const t1& arg1, const t2& arg2
 810 #define IPC_TYPE_IN_3(t1, t2, t3)           const t1& arg1, const t2& arg2, const t3& arg3
 811 #define IPC_TYPE_IN_4(t1, t2, t3, t4)       const t1& arg1, const t2& arg2, const t3& arg3, const t4& arg4
 812 #define IPC_TYPE_IN_5(t1, t2, t3, t4, t5)   const t1& arg1, const t2& arg2, const t3& arg3, const t4& arg4, const t5& arg5
 813
 814 #define IPC_TYPE_OUT_0()
 815 #define IPC_TYPE_OUT_1(t1)                  t1* arg6
 816 #define IPC_TYPE_OUT_2(t1, t2)              t1* arg6, t2* arg7
 817 #define IPC_TYPE_OUT_3(t1, t2, t3)          t1* arg6, t2* arg7, t3* arg8
 818 #define IPC_TYPE_OUT_4(t1, t2, t3, t4)      t1* arg6, t2* arg7, t3* arg8, t4* arg9
 819
 820 #define IPC_TUPLE_IN_0()                    Tuple0
 821 #define IPC_TUPLE_IN_1(t1)                  Tuple1<t1>
 822 #define IPC_TUPLE_IN_2(t1, t2)              Tuple2<t1, t2>
 823 #define IPC_TUPLE_IN_3(t1, t2, t3)          Tuple3<t1, t2, t3>
 824 #define IPC_TUPLE_IN_4(t1, t2, t3, t4)      Tuple4<t1, t2, t3, t4>
 825 #define IPC_TUPLE_IN_5(t1, t2, t3, t4, t5)  Tuple5<t1, t2, t3, t4, t5>
 826
 827 #define IPC_TUPLE_OUT_0()                   Tuple0
 828 #define IPC_TUPLE_OUT_1(t1)                 Tuple1<t1&>
 829 #define IPC_TUPLE_OUT_2(t1, t2)             Tuple2<t1&, t2&>
 830 #define IPC_TUPLE_OUT_3(t1, t2, t3)         Tuple3<t1&, t2&, t3&>
 831 #define IPC_TUPLE_OUT_4(t1, t2, t3, t4)     Tuple4<t1&, t2&, t3&, t4&>
 832
 833 #define IPC_NAME_IN_0()                     MakeTuple()
 834 #define IPC_NAME_IN_1(t1)                   MakeRefTuple(arg1)
 835 #define IPC_NAME_IN_2(t1, t2)               MakeRefTuple(arg1, arg2)
 836 #define IPC_NAME_IN_3(t1, t2, t3)           MakeRefTuple(arg1, arg2, arg3)
 837 #define IPC_NAME_IN_4(t1, t2, t3, t4)       MakeRefTuple(arg1, arg2, arg3, arg4)
 838 #define IPC_NAME_IN_5(t1, t2, t3, t4, t5)   MakeRefTuple(arg1, arg2, arg3, arg4, arg5)
 839
 840 #define IPC_NAME_OUT_0()                    MakeTuple()
 841 #define IPC_NAME_OUT_1(t1)                  MakeRefTuple(*arg6)
 842 #define IPC_NAME_OUT_2(t1, t2)              MakeRefTuple(*arg6, *arg7)
 843 #define IPC_NAME_OUT_3(t1, t2, t3)          MakeRefTuple(*arg6, *arg7, *arg8)
 844 #define IPC_NAME_OUT_4(t1, t2, t3, t4)      MakeRefTuple(*arg6, *arg7, *arg8, *arg9)
 845
 846 // There are places where the syntax requires a comma if there are input args,
 847 // if there are input args and output args, or if there are input args or
 848 // output args.  These macros allow generation of the comma as needed; invoke
 849 // by token pasting against the argument counts.
 850 #define IPC_COMMA_0
 851 #define IPC_COMMA_1 ,
 852 #define IPC_COMMA_2 ,
 853 #define IPC_COMMA_3 ,
 854 #define IPC_COMMA_4 ,
 855 #define IPC_COMMA_5 ,
 856
 857 #define IPC_COMMA_AND_0(x)
 858 #define IPC_COMMA_AND_1(x) x
 859 #define IPC_COMMA_AND_2(x) x
 860 #define IPC_COMMA_AND_3(x) x
 861 #define IPC_COMMA_AND_4(x) x
 862 #define IPC_COMMA_AND_5(x) x
 863
 864 #define IPC_COMMA_OR_0(x) x
 865 #define IPC_COMMA_OR_1(x) ,
 866 #define IPC_COMMA_OR_2(x) ,
 867 #define IPC_COMMA_OR_3(x) ,
 868 #define IPC_COMMA_OR_4(x) ,
 869 #define IPC_COMMA_OR_5(x) ,
 870
 871 // Message IDs
 872 // Note: we currently use __LINE__ to give unique IDs to messages within
 873 // a file.  They're globally unique since each file defines its own
 874 // IPC_MESSAGE_START.
 875 #define IPC_MESSAGE_ID() ((IPC_MESSAGE_START << 16) + __LINE__)
 876 #define IPC_MESSAGE_ID_CLASS(id) ((id) >> 16)
 877 #define IPC_MESSAGE_ID_LINE(id) ((id) & 0xffff)
 878
 879 // Message crackers and handlers.
 880 // Prefer to use the IPC_BEGIN_MESSAGE_MAP_EX to the older macros since they
 881 // allow you to detect when a message could not be de-serialized. Usage:
 882 //
 883 //   bool MyClass::OnMessageReceived(const IPC::Message& msg) {
 884 //     bool handled = true;
 885 //     bool msg_is_good = false;
 886 //     IPC_BEGIN_MESSAGE_MAP_EX(MyClass, msg, msg_is_good)
 887 //       IPC_MESSAGE_HANDLER(MsgClassOne, OnMsgClassOne)
 888 //       ...more handlers here ...
 889 //       IPC_MESSAGE_HANDLER(MsgClassTen, OnMsgClassTen)
 890 //       IPC_MESSAGE_UNHANDLED(handled = false)
 891 //     IPC_END_MESSAGE_MAP_EX()
 892 //     if (!msg_is_good) {
 893 //       // Signal error here or terminate offending process.
 894 //     }
 895 //     return handled;
 896 //   }
 897
 898
 899 #define IPC_BEGIN_MESSAGE_MAP_EX(class_name, msg, msg_is_ok) \
 900   { \
 901     typedef class_name _IpcMessageHandlerClass; \
 902     void* param__ = NULL; \
 903     const IPC::Message& ipc_message__ = msg; \
 904     bool& msg_is_ok__ = msg_is_ok; \
 905     switch (ipc_message__.type()) {
 906
 907 #define IPC_BEGIN_MESSAGE_MAP(class_name, msg) \
 908   { \
 909     typedef class_name _IpcMessageHandlerClass; \
 910     void* param__ = NULL; \
 911     const IPC::Message& ipc_message__ = msg; \
 912     bool msg_is_ok__ = true; \
 913     switch (ipc_message__.type()) {
 914
 915 // gcc gives the following error now when using decltype so type typeof there:
 916 //   error: identifier 'decltype' will become a keyword in C++0x [-Werror=c++0x-compat]
 917 #if defined(OS_WIN)
 918 #define IPC_DECLTYPE decltype
 919 #else
 920 #define IPC_DECLTYPE typeof
 921 #endif
 922
 923 #define IPC_BEGIN_MESSAGE_MAP_WITH_PARAM(class_name, msg, msg_is_ok, param)    \
 924   {                                                                            \
 925     typedef class_name _IpcMessageHandlerClass;                                \
 926     IPC_DECLTYPE(param) param__ = param;                                       \
 927     const IPC::Message& ipc_message__ = msg;                                   \
 928     bool& msg_is_ok__ = msg_is_ok;                                             \
 929     switch (ipc_message__.type()) {
 930
 931 #define IPC_MESSAGE_FORWARD(msg_class, obj, member_func)                       \
 932     case msg_class::ID: {                                                      \
 933         TRACK_RUN_IN_IPC_HANDLER(member_func);                                 \
 934         msg_is_ok__ = msg_class::Dispatch(&ipc_message__, obj, this,           \
 935                                           param__, &member_func);              \
 936       }                                                                        \
 937       break;
 938
 939 #define IPC_MESSAGE_HANDLER(msg_class, member_func) \
 940   IPC_MESSAGE_FORWARD(msg_class, this, _IpcMessageHandlerClass::member_func)
 941
 942 #define IPC_MESSAGE_FORWARD_DELAY_REPLY(msg_class, obj, member_func)           \
 943     case msg_class::ID: {                                                      \
 944         TRACK_RUN_IN_IPC_HANDLER(member_func);                                 \
 945         msg_is_ok__ = msg_class::DispatchDelayReply(&ipc_message__, obj,       \
 946                                                   param__, &member_func);      \
 947       }                                                                        \
 948       break;
 949
 950 #define IPC_MESSAGE_HANDLER_DELAY_REPLY(msg_class, member_func)                \
 951     IPC_MESSAGE_FORWARD_DELAY_REPLY(msg_class, this,                           \
 952                                     _IpcMessageHandlerClass::member_func)
 953
 954 // TODO(jar): fix chrome frame to always supply |code| argument.
 955 #define IPC_MESSAGE_HANDLER_GENERIC(msg_class, code)                           \
 956     case msg_class::ID: {                                                      \
 957         /* TRACK_RUN_IN_IPC_HANDLER(code);  TODO(jar) */                       \
 958         code;                                                                  \
 959       }                                                                        \
 960       break;
 961
 962 #define IPC_REPLY_HANDLER(func)                                                \
 963     case IPC_REPLY_ID: {                                                       \
 964         TRACK_RUN_IN_IPC_HANDLER(func);                                        \
 965         func(ipc_message__);                                                   \
 966       }                                                                        \
 967       break;
 968
 969
 970 #define IPC_MESSAGE_UNHANDLED(code)                                            \
 971     default: {                                                                 \
 972         code;                                                                  \
 973       }                                                                        \
 974       break;
 975
 976 #define IPC_MESSAGE_UNHANDLED_ERROR() \
 977   IPC_MESSAGE_UNHANDLED(NOTREACHED() << \
 978                               "Invalid message with type = " << \
 979                               ipc_message__.type())
 980
 981 #define IPC_END_MESSAGE_MAP() \
 982   } \
 983   DCHECK(msg_is_ok__); \
 984 }
 985
 986 #define IPC_END_MESSAGE_MAP_EX() \
 987   } \
 988 }
 989
 990 // This corresponds to an enum value from IPCMessageStart.
 991 #define IPC_MESSAGE_CLASS(message) \
 992   IPC_MESSAGE_ID_CLASS(message.type())
 993
 994 #endif  // IPC_IPC_MESSAGE_MACROS_H_
 995
 996 // The following #ifdef cannot be removed.  Although the code is semantically
 997 // equivalent without the #ifdef, VS2013 contains a bug where it is
 998 // over-aggressive in optimizing out #includes.  Putting the #ifdef is a
 999 // workaround for this bug.  See http://goo.gl/eGt2Fb for more details.
1000 // This can be removed once VS2013 is fixed.
1001 #ifdef IPC_MESSAGE_START
1002 // Clean up IPC_MESSAGE_START in this unguarded section so that the
1003 // XXX_messages.h files need not do so themselves.  This makes the
1004 // XXX_messages.h files easier to write.
1005 #undef IPC_MESSAGE_START
1006 #endif