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 //      #include "path/to/some_class.h"        // Full class declaration
 117 //      #include "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, get<0>(p));                                     \
 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, get<0>(p), get<1>(p));                          \
 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, get<0>(p), get<1>(p), get<2>(p));               \
 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, get<0>(p), get<1>(p), get<2>(p), get<3>(p));    \
 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, get<0>(p), get<1>(p), get<2>(p), get<3>(p),     \
 511                    get<4>(p));                                                \
 512       return true;                                                            \
 513     }                                                                         \
 514     return false;                                                             \
 515   }
 516
 517 // The following macros define the common set of methods provided by SYNC
 518 // message classes.
 519 #define IPC_SYNC_MESSAGE_METHODS_GENERIC                                      \
 520   template<class T, class S, class P, class Method>                           \
 521   static bool Dispatch(const Message* msg, T* obj, S* sender, P* parameter,   \
 522                        Method func) {                                         \
 523     Schema::SendParam send_params;                                            \
 524     bool ok = ReadSendParam(msg, &send_params);                               \
 525     return Schema::DispatchWithSendParams(ok, send_params, msg, obj, sender,  \
 526                                           func);                              \
 527   }                                                                           \
 528   template<class T, class P, class Method>                                    \
 529   static bool DispatchDelayReply(const Message* msg, T* obj, P* parameter,    \
 530                                  Method func) {                               \
 531     Schema::SendParam send_params;                                            \
 532     bool ok = ReadSendParam(msg, &send_params);                               \
 533     return Schema::DispatchDelayReplyWithSendParams(ok, send_params, msg,     \
 534                                                     obj, func);               \
 535   }
 536 #define IPC_SYNC_MESSAGE_METHODS_0 \
 537   IPC_SYNC_MESSAGE_METHODS_GENERIC
 538 #define IPC_SYNC_MESSAGE_METHODS_1 \
 539   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 540   template<typename TA> \
 541   static void WriteReplyParams(Message* reply, TA a) { \
 542     Schema::WriteReplyParams(reply, a); \
 543   }
 544 #define IPC_SYNC_MESSAGE_METHODS_2 \
 545   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 546   template<typename TA, typename TB> \
 547   static void WriteReplyParams(Message* reply, TA a, TB b) { \
 548     Schema::WriteReplyParams(reply, a, b); \
 549   }
 550 #define IPC_SYNC_MESSAGE_METHODS_3 \
 551   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 552   template<typename TA, typename TB, typename TC> \
 553   static void WriteReplyParams(Message* reply, TA a, TB b, TC c) { \
 554     Schema::WriteReplyParams(reply, a, b, c); \
 555   }
 556 #define IPC_SYNC_MESSAGE_METHODS_4 \
 557   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 558   template<typename TA, typename TB, typename TC, typename TD> \
 559   static void WriteReplyParams(Message* reply, TA a, TB b, TC c, TD d) { \
 560     Schema::WriteReplyParams(reply, a, b, c, d); \
 561   }
 562 #define IPC_SYNC_MESSAGE_METHODS_5 \
 563   IPC_SYNC_MESSAGE_METHODS_GENERIC \
 564   template<typename TA, typename TB, typename TC, typename TD, typename TE> \
 565   static void WriteReplyParams(Message* reply, TA a, TB b, TC c, TD d, TE e) { \
 566     Schema::WriteReplyParams(reply, a, b, c, d, e); \
 567   }
 568
 569 // Common message macro which dispatches into one of the 6 (sync x kind)
 570 // routines.  There is a way that these 6 cases can be lumped together,
 571 // but the  macros get very complicated in that case.
 572 // Note: intended be redefined to generate other information.
 573 #define IPC_MESSAGE_DECL(sync, kind, msg_class,                               \
 574                          in_cnt, out_cnt, in_list, out_list)                  \
 575   IPC_##sync##_##kind##_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
 576   IPC_MESSAGE_EXTRA(sync, kind, msg_class, in_cnt, out_cnt, in_list, out_list)
 577
 578 #define IPC_EMPTY_CONTROL_DECL(msg_class, in_cnt, out_cnt, in_list, out_list) \
 579   class IPC_MESSAGE_EXPORT msg_class : public IPC::Message {                  \
 580    public:                                                                    \
 581     typedef IPC::Message Schema;                                              \
 582     enum { ID = IPC_MESSAGE_ID() };                                           \
 583     msg_class() : IPC::Message(MSG_ROUTING_CONTROL, ID, PRIORITY_NORMAL) {}   \
 584     static void Log(std::string* name, const Message* msg, std::string* l);   \
 585   };
 586
 587 #define IPC_EMPTY_ROUTED_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 588   class IPC_MESSAGE_EXPORT msg_class : public IPC::Message {                  \
 589    public:                                                                    \
 590     typedef IPC::Message Schema;                                              \
 591     enum { ID = IPC_MESSAGE_ID() };                                           \
 592     msg_class(int32 routing_id)                                               \
 593         : IPC::Message(routing_id, ID, PRIORITY_NORMAL) {}                    \
 594     static void Log(std::string* name, const Message* msg, std::string* l);   \
 595   };
 596
 597 #define IPC_ASYNC_CONTROL_DECL(msg_class, in_cnt, out_cnt, in_list, out_list) \
 598   class IPC_MESSAGE_EXPORT msg_class : public IPC::Message {                  \
 599    public:                                                                    \
 600     typedef IPC::MessageSchema<IPC_TUPLE_IN_##in_cnt in_list> Schema;         \
 601     typedef Schema::Param Param;                                              \
 602     enum { ID = IPC_MESSAGE_ID() };                                           \
 603     msg_class(IPC_TYPE_IN_##in_cnt in_list);                                  \
 604     ~msg_class() override;                                                    \
 605     static bool Read(const Message* msg, Schema::Param* p);                   \
 606     static void Log(std::string* name, const Message* msg, std::string* l);   \
 607     IPC_ASYNC_MESSAGE_METHODS_##in_cnt                                        \
 608   };
 609
 610 #define IPC_ASYNC_ROUTED_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 611   class IPC_MESSAGE_EXPORT msg_class : public IPC::Message {                  \
 612    public:                                                                    \
 613     typedef IPC::MessageSchema<IPC_TUPLE_IN_##in_cnt in_list> Schema;         \
 614     typedef Schema::Param Param;                                              \
 615     enum { ID = IPC_MESSAGE_ID() };                                           \
 616     msg_class(int32 routing_id IPC_COMMA_##in_cnt                             \
 617               IPC_TYPE_IN_##in_cnt in_list);                                  \
 618     ~msg_class() override;                                                    \
 619     static bool Read(const Message* msg, Schema::Param* p);                   \
 620     static void Log(std::string* name, const Message* msg, std::string* l);   \
 621     IPC_ASYNC_MESSAGE_METHODS_##in_cnt                                        \
 622   };
 623
 624 #define IPC_SYNC_CONTROL_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 625   class IPC_MESSAGE_EXPORT msg_class : public IPC::SyncMessage {              \
 626    public:                                                                    \
 627     typedef IPC::SyncMessageSchema<IPC_TUPLE_IN_##in_cnt in_list,             \
 628                                    IPC_TUPLE_OUT_##out_cnt out_list> Schema;  \
 629     typedef Schema::ReplyParam ReplyParam;                                    \
 630     typedef Schema::SendParam SendParam;                                      \
 631     enum { ID = IPC_MESSAGE_ID() };                                           \
 632     msg_class(IPC_TYPE_IN_##in_cnt in_list                                    \
 633               IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)                     \
 634               IPC_TYPE_OUT_##out_cnt out_list);                               \
 635     ~msg_class() override;                                                    \
 636     static bool ReadSendParam(const Message* msg, Schema::SendParam* p);      \
 637     static bool ReadReplyParam(                                               \
 638         const Message* msg,                                                   \
 639         TupleTypes<ReplyParam>::ValueTuple* p);                               \
 640     static void Log(std::string* name, const Message* msg, std::string* l);   \
 641     IPC_SYNC_MESSAGE_METHODS_##out_cnt                                        \
 642   };
 643
 644 #define IPC_SYNC_ROUTED_DECL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
 645   class IPC_MESSAGE_EXPORT msg_class : public IPC::SyncMessage {              \
 646    public:                                                                    \
 647     typedef IPC::SyncMessageSchema<IPC_TUPLE_IN_##in_cnt in_list,             \
 648                                    IPC_TUPLE_OUT_##out_cnt out_list> Schema;  \
 649     typedef Schema::ReplyParam ReplyParam;                                    \
 650     typedef Schema::SendParam SendParam;                                      \
 651     enum { ID = IPC_MESSAGE_ID() };                                           \
 652     msg_class(int32 routing_id                                                \
 653               IPC_COMMA_OR_##in_cnt(IPC_COMMA_##out_cnt)                      \
 654               IPC_TYPE_IN_##in_cnt in_list                                    \
 655               IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)                     \
 656               IPC_TYPE_OUT_##out_cnt out_list);                               \
 657     ~msg_class() override;                                                    \
 658     static bool ReadSendParam(const Message* msg, Schema::SendParam* p);      \
 659     static bool ReadReplyParam(                                               \
 660         const Message* msg,                                                   \
 661         TupleTypes<ReplyParam>::ValueTuple* p);                               \
 662     static void Log(std::string* name, const Message* msg, std::string* l);   \
 663     IPC_SYNC_MESSAGE_METHODS_##out_cnt                                        \
 664   };
 665
 666 #if defined(IPC_MESSAGE_IMPL)
 667
 668 // "Implementation" inclusion produces constructors, destructors, and
 669 // logging functions, except for the no-arg special cases, where the
 670 // implementation occurs in the declaration, and there is no special
 671 // logging function.
 672 #define IPC_MESSAGE_EXTRA(sync, kind, msg_class,                              \
 673                           in_cnt, out_cnt, in_list, out_list)                 \
 674   IPC_##sync##_##kind##_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
 675   IPC_##sync##_MESSAGE_LOG(msg_class)
 676
 677 #define IPC_EMPTY_CONTROL_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)
 678 #define IPC_EMPTY_ROUTED_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)
 679
 680 #define IPC_ASYNC_CONTROL_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list) \
 681   msg_class::msg_class(IPC_TYPE_IN_##in_cnt in_list) :                        \
 682       IPC::Message(MSG_ROUTING_CONTROL, ID, PRIORITY_NORMAL) {                \
 683         Schema::Write(this, IPC_NAME_IN_##in_cnt in_list);                    \
 684       }                                                                       \
 685   msg_class::~msg_class() {}                                                  \
 686   bool msg_class::Read(const Message* msg, Schema::Param* p) {                \
 687     return Schema::Read(msg, p);                                              \
 688   }
 689
 690 #define IPC_ASYNC_ROUTED_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 691   msg_class::msg_class(int32 routing_id IPC_COMMA_##in_cnt                    \
 692                        IPC_TYPE_IN_##in_cnt in_list) :                        \
 693       IPC::Message(routing_id, ID, PRIORITY_NORMAL) {                         \
 694         Schema::Write(this, IPC_NAME_IN_##in_cnt in_list);                    \
 695       }                                                                       \
 696   msg_class::~msg_class() {}                                                  \
 697   bool msg_class::Read(const Message* msg, Schema::Param* p) {                \
 698     return Schema::Read(msg, p);                                              \
 699   }
 700
 701 #define IPC_SYNC_CONTROL_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)  \
 702   msg_class::msg_class(IPC_TYPE_IN_##in_cnt in_list                           \
 703                        IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)            \
 704                        IPC_TYPE_OUT_##out_cnt out_list) :                     \
 705       IPC::SyncMessage(MSG_ROUTING_CONTROL, ID, PRIORITY_NORMAL,              \
 706                        new IPC::ParamDeserializer<Schema::ReplyParam>(        \
 707                            IPC_NAME_OUT_##out_cnt out_list)) {                \
 708         Schema::Write(this, IPC_NAME_IN_##in_cnt in_list);                    \
 709       }                                                                       \
 710   msg_class::~msg_class() {}                                                  \
 711   bool msg_class::ReadSendParam(const Message* msg, Schema::SendParam* p) {   \
 712     return Schema::ReadSendParam(msg, p);                                     \
 713   }                                                                           \
 714   bool msg_class::ReadReplyParam(const Message* msg,                          \
 715                                  TupleTypes<ReplyParam>::ValueTuple* p) {     \
 716     return Schema::ReadReplyParam(msg, p);                                    \
 717   }
 718
 719 #define IPC_SYNC_ROUTED_IMPL(msg_class, in_cnt, out_cnt, in_list, out_list)   \
 720   msg_class::msg_class(int32 routing_id                                       \
 721                        IPC_COMMA_OR_##in_cnt(IPC_COMMA_##out_cnt)             \
 722                        IPC_TYPE_IN_##in_cnt in_list                           \
 723                        IPC_COMMA_AND_##in_cnt(IPC_COMMA_##out_cnt)            \
 724                        IPC_TYPE_OUT_##out_cnt out_list) :                     \
 725       IPC::SyncMessage(routing_id, ID, PRIORITY_NORMAL,                       \
 726                        new IPC::ParamDeserializer<Schema::ReplyParam>(        \
 727                            IPC_NAME_OUT_##out_cnt out_list)) {                \
 728         Schema::Write(this, IPC_NAME_IN_##in_cnt in_list);                    \
 729       }                                                                       \
 730   msg_class::~msg_class() {}                                                  \
 731   bool msg_class::ReadSendParam(const Message* msg, Schema::SendParam* p) {   \
 732     return Schema::ReadSendParam(msg, p);                                     \
 733   }                                                                           \
 734   bool msg_class::ReadReplyParam(const Message* msg,                          \
 735                                  TupleTypes<ReplyParam>::ValueTuple* p) {     \
 736     return Schema::ReadReplyParam(msg, p);                                    \
 737   }
 738
 739 #define IPC_EMPTY_MESSAGE_LOG(msg_class)                                \
 740   void msg_class::Log(std::string* name,                                \
 741                       const Message* msg,                               \
 742                       std::string* l) {                                 \
 743     if (name)                                                           \
 744       *name = #msg_class;                                               \
 745   }
 746
 747 #define IPC_ASYNC_MESSAGE_LOG(msg_class)                                \
 748   void msg_class::Log(std::string* name,                                \
 749                       const Message* msg,                               \
 750                       std::string* l) {                                 \
 751     if (name)                                                           \
 752       *name = #msg_class;                                               \
 753     if (!msg || !l)                                                     \
 754       return;                                                           \
 755     Schema::Param p;                                                    \
 756     if (Schema::Read(msg, &p))                                          \
 757       IPC::LogParam(p, l);                                              \
 758   }
 759
 760 #define IPC_SYNC_MESSAGE_LOG(msg_class)                                 \
 761   void msg_class::Log(std::string* name,                                \
 762                       const Message* msg,                               \
 763                       std::string* l) {                                 \
 764     if (name)                                                           \
 765       *name = #msg_class;                                               \
 766     if (!msg || !l)                                                     \
 767       return;                                                           \
 768     if (msg->is_sync()) {                                               \
 769       TupleTypes<Schema::SendParam>::ValueTuple p;                      \
 770       if (Schema::ReadSendParam(msg, &p))                               \
 771         IPC::LogParam(p, l);                                            \
 772       AddOutputParamsToLog(msg, l);                                     \
 773     } else {                                                            \
 774       TupleTypes<Schema::ReplyParam>::ValueTuple p;                     \
 775       if (Schema::ReadReplyParam(msg, &p))                              \
 776         IPC::LogParam(p, l);                                            \
 777     }                                                                   \
 778   }
 779
 780 #elif defined(IPC_MESSAGE_MACROS_LOG_ENABLED)
 781
 782 #ifndef IPC_LOG_TABLE_ADD_ENTRY
 783 #error You need to define IPC_LOG_TABLE_ADD_ENTRY(msg_id, logger)
 784 #endif
 785
 786 // "Log table" inclusion produces extra logging registration code.
 787 #define IPC_MESSAGE_EXTRA(sync, kind, msg_class,                        \
 788                           in_cnt, out_cnt, in_list, out_list)           \
 789   class LoggerRegisterHelper##msg_class {                               \
 790  public:                                                                \
 791     LoggerRegisterHelper##msg_class() {                                 \
 792       const uint32 msg_id = static_cast<uint32>(msg_class::ID);         \
 793       IPC_LOG_TABLE_ADD_ENTRY(msg_id, msg_class::Log);                  \
 794     }                                                                   \
 795   };                                                                    \
 796   LoggerRegisterHelper##msg_class g_LoggerRegisterHelper##msg_class;
 797
 798 #else
 799
 800 // Normal inclusion produces nothing extra.
 801 #define IPC_MESSAGE_EXTRA(sync, kind, msg_class,                \
 802                           in_cnt, out_cnt, in_list, out_list)
 803
 804 #endif // defined(IPC_MESSAGE_IMPL)
 805
 806 // Handle variable sized argument lists.  These are usually invoked by token
 807 // pasting against the argument counts.
 808 #define IPC_TYPE_IN_0()
 809 #define IPC_TYPE_IN_1(t1)                   const t1& arg1
 810 #define IPC_TYPE_IN_2(t1, t2)               const t1& arg1, const t2& arg2
 811 #define IPC_TYPE_IN_3(t1, t2, t3)           const t1& arg1, const t2& arg2, const t3& arg3
 812 #define IPC_TYPE_IN_4(t1, t2, t3, t4)       const t1& arg1, const t2& arg2, const t3& arg3, const t4& arg4
 813 #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
 814
 815 #define IPC_TYPE_OUT_0()
 816 #define IPC_TYPE_OUT_1(t1)                  t1* arg6
 817 #define IPC_TYPE_OUT_2(t1, t2)              t1* arg6, t2* arg7
 818 #define IPC_TYPE_OUT_3(t1, t2, t3)          t1* arg6, t2* arg7, t3* arg8
 819 #define IPC_TYPE_OUT_4(t1, t2, t3, t4)      t1* arg6, t2* arg7, t3* arg8, t4* arg9
 820
 821 #define IPC_TUPLE_IN_0()                    Tuple<>
 822 #define IPC_TUPLE_IN_1(t1)                  Tuple<t1>
 823 #define IPC_TUPLE_IN_2(t1, t2)              Tuple<t1, t2>
 824 #define IPC_TUPLE_IN_3(t1, t2, t3)          Tuple<t1, t2, t3>
 825 #define IPC_TUPLE_IN_4(t1, t2, t3, t4)      Tuple<t1, t2, t3, t4>
 826 #define IPC_TUPLE_IN_5(t1, t2, t3, t4, t5)  Tuple<t1, t2, t3, t4, t5>
 827
 828 #define IPC_TUPLE_OUT_0()                   Tuple<>
 829 #define IPC_TUPLE_OUT_1(t1)                 Tuple<t1&>
 830 #define IPC_TUPLE_OUT_2(t1, t2)             Tuple<t1&, t2&>
 831 #define IPC_TUPLE_OUT_3(t1, t2, t3)         Tuple<t1&, t2&, t3&>
 832 #define IPC_TUPLE_OUT_4(t1, t2, t3, t4)     Tuple<t1&, t2&, t3&, t4&>
 833
 834 #define IPC_NAME_IN_0()                     MakeTuple()
 835 #define IPC_NAME_IN_1(t1)                   MakeRefTuple(arg1)
 836 #define IPC_NAME_IN_2(t1, t2)               MakeRefTuple(arg1, arg2)
 837 #define IPC_NAME_IN_3(t1, t2, t3)           MakeRefTuple(arg1, arg2, arg3)
 838 #define IPC_NAME_IN_4(t1, t2, t3, t4)       MakeRefTuple(arg1, arg2, arg3, arg4)
 839 #define IPC_NAME_IN_5(t1, t2, t3, t4, t5)   MakeRefTuple(arg1, arg2, arg3, arg4, arg5)
 840
 841 #define IPC_NAME_OUT_0()                    MakeTuple()
 842 #define IPC_NAME_OUT_1(t1)                  MakeRefTuple(*arg6)
 843 #define IPC_NAME_OUT_2(t1, t2)              MakeRefTuple(*arg6, *arg7)
 844 #define IPC_NAME_OUT_3(t1, t2, t3)          MakeRefTuple(*arg6, *arg7, *arg8)
 845 #define IPC_NAME_OUT_4(t1, t2, t3, t4)      MakeRefTuple(*arg6, *arg7, *arg8, *arg9)
 846
 847 // There are places where the syntax requires a comma if there are input args,
 848 // if there are input args and output args, or if there are input args or
 849 // output args.  These macros allow generation of the comma as needed; invoke
 850 // by token pasting against the argument counts.
 851 #define IPC_COMMA_0
 852 #define IPC_COMMA_1 ,
 853 #define IPC_COMMA_2 ,
 854 #define IPC_COMMA_3 ,
 855 #define IPC_COMMA_4 ,
 856 #define IPC_COMMA_5 ,
 857
 858 #define IPC_COMMA_AND_0(x)
 859 #define IPC_COMMA_AND_1(x) x
 860 #define IPC_COMMA_AND_2(x) x
 861 #define IPC_COMMA_AND_3(x) x
 862 #define IPC_COMMA_AND_4(x) x
 863 #define IPC_COMMA_AND_5(x) x
 864
 865 #define IPC_COMMA_OR_0(x) x
 866 #define IPC_COMMA_OR_1(x) ,
 867 #define IPC_COMMA_OR_2(x) ,
 868 #define IPC_COMMA_OR_3(x) ,
 869 #define IPC_COMMA_OR_4(x) ,
 870 #define IPC_COMMA_OR_5(x) ,
 871
 872 // Message IDs
 873 // Note: we currently use __LINE__ to give unique IDs to messages within
 874 // a file.  They're globally unique since each file defines its own
 875 // IPC_MESSAGE_START.
 876 #define IPC_MESSAGE_ID() ((IPC_MESSAGE_START << 16) + __LINE__)
 877 #define IPC_MESSAGE_ID_CLASS(id) ((id) >> 16)
 878 #define IPC_MESSAGE_ID_LINE(id) ((id) & 0xffff)
 879
 880 // Message crackers and handlers. Usage:
 881 //
 882 //   bool MyClass::OnMessageReceived(const IPC::Message& msg) {
 883 //     bool handled = true;
 884 //     IPC_BEGIN_MESSAGE_MAP(MyClass, msg)
 885 //       IPC_MESSAGE_HANDLER(MsgClassOne, OnMsgClassOne)
 886 //       ...more handlers here ...
 887 //       IPC_MESSAGE_HANDLER(MsgClassTen, OnMsgClassTen)
 888 //       IPC_MESSAGE_UNHANDLED(handled = false)
 889 //     IPC_END_MESSAGE_MAP()
 890 //     return handled;
 891 //   }
 892
 893
 894 #define IPC_BEGIN_MESSAGE_MAP(class_name, msg) \
 895   { \
 896     typedef class_name _IpcMessageHandlerClass ALLOW_UNUSED_TYPE; \
 897     void* param__ = NULL; \
 898     const IPC::Message& ipc_message__ = msg; \
 899     switch (ipc_message__.type()) {
 900
 901 #define IPC_BEGIN_MESSAGE_MAP_WITH_PARAM(class_name, msg, param)  \
 902   {                                                               \
 903     typedef class_name _IpcMessageHandlerClass ALLOW_UNUSED_TYPE; \
 904     decltype(param) param__ = param;                              \
 905     const IPC::Message& ipc_message__ = msg;                      \
 906     switch (ipc_message__.type()) {
 907
 908 #define IPC_MESSAGE_FORWARD(msg_class, obj, member_func)                       \
 909     case msg_class::ID: {                                                      \
 910         TRACK_RUN_IN_THIS_SCOPED_REGION(member_func);                          \
 911         if (!msg_class::Dispatch(&ipc_message__, obj, this, param__,           \
 912                                  &member_func))                                \
 913           ipc_message__.set_dispatch_error();                                  \
 914       }                                                                        \
 915       break;
 916
 917 #define IPC_MESSAGE_HANDLER(msg_class, member_func) \
 918   IPC_MESSAGE_FORWARD(msg_class, this, _IpcMessageHandlerClass::member_func)
 919
 920 #define IPC_MESSAGE_FORWARD_DELAY_REPLY(msg_class, obj, member_func)           \
 921     case msg_class::ID: {                                                      \
 922         TRACK_RUN_IN_THIS_SCOPED_REGION(member_func);                          \
 923         if (!msg_class::DispatchDelayReply(&ipc_message__, obj, param__,       \
 924                                            &member_func))                      \
 925           ipc_message__.set_dispatch_error();                                  \
 926       }                                                                        \
 927       break;
 928
 929 #define IPC_MESSAGE_HANDLER_DELAY_REPLY(msg_class, member_func)                \
 930     IPC_MESSAGE_FORWARD_DELAY_REPLY(msg_class, this,                           \
 931                                     _IpcMessageHandlerClass::member_func)
 932
 933 // TODO(jar): fix chrome frame to always supply |code| argument.
 934 #define IPC_MESSAGE_HANDLER_GENERIC(msg_class, code)                           \
 935     case msg_class::ID: {                                                      \
 936         /* TRACK_RUN_IN_THIS_SCOPED_REGION(code);  TODO(jar) */                \
 937         code;                                                                  \
 938       }                                                                        \
 939       break;
 940
 941 #define IPC_REPLY_HANDLER(func)                                                \
 942     case IPC_REPLY_ID: {                                                       \
 943         TRACK_RUN_IN_THIS_SCOPED_REGION(func);                                 \
 944         func(ipc_message__);                                                   \
 945       }                                                                        \
 946       break;
 947
 948
 949 #define IPC_MESSAGE_UNHANDLED(code)                                            \
 950     default: {                                                                 \
 951         code;                                                                  \
 952       }                                                                        \
 953       break;
 954
 955 #define IPC_MESSAGE_UNHANDLED_ERROR() \
 956   IPC_MESSAGE_UNHANDLED(NOTREACHED() << \
 957                               "Invalid message with type = " << \
 958                               ipc_message__.type())
 959
 960 #define IPC_END_MESSAGE_MAP() \
 961   } \
 962 }
 963
 964 // This corresponds to an enum value from IPCMessageStart.
 965 #define IPC_MESSAGE_CLASS(message) \
 966   IPC_MESSAGE_ID_CLASS(message.type())
 967
 968 #endif  // IPC_IPC_MESSAGE_MACROS_H_
 969
 970 // Clean up IPC_MESSAGE_START in this unguarded section so that the
 971 // XXX_messages.h files need not do so themselves.  This makes the
 972 // XXX_messages.h files easier to write.
 973 #undef IPC_MESSAGE_START