ppapi/host/dispatch_host_message.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 // This file provides infrastructure for dispatching host resource call
   6 // messages. Normal IPC message handlers can't take extra parameters or
   7 // return values. We want to take a HostMessageContext as a parameter and
   8 // also return the int32_t return value to the caller.
   9
  10 #ifndef PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_
  11 #define PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_
  12
  13 #include "base/profiler/scoped_profile.h"  // For TRACK_RUN_IN_IPC_HANDLER.
  14 #include "ipc/ipc_message_macros.h"
  15 #include "ppapi/c/pp_errors.h"
  16
  17 namespace ppapi {
  18 namespace host {
  19
  20 struct HostMessageContext;
  21
  22 template <class ObjT, class Method>
  23 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
  24                                     HostMessageContext* context,
  25                                     Tuple0& arg) {
  26   return (obj->*method)(context);
  27 }
  28
  29 template <class ObjT, class Method, class A>
  30 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
  31                                     HostMessageContext* context,
  32                                     Tuple1<A>& arg) {
  33   return (obj->*method)(context, arg.a);
  34 }
  35
  36 template<class ObjT, class Method, class A, class B>
  37 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
  38                                     HostMessageContext* context,
  39                                     Tuple2<A, B>& arg) {
  40   return (obj->*method)(context, arg.a, arg.b);
  41 }
  42
  43 template<class ObjT, class Method, class A, class B, class C>
  44 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
  45                                     HostMessageContext* context,
  46                                     Tuple3<A, B, C>& arg) {
  47   return (obj->*method)(context, arg.a, arg.b, arg.c);
  48 }
  49
  50 template<class ObjT, class Method, class A, class B, class C, class D>
  51 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
  52                                     HostMessageContext* context,
  53                                     Tuple4<A, B, C, D>& arg) {
  54   return (obj->*method)(context, arg.a, arg.b, arg.c, arg.d);
  55 }
  56
  57 template<class ObjT, class Method, class A, class B, class C, class D, class E>
  58 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
  59                                     HostMessageContext* context,
  60                                     Tuple5<A, B, C, D, E>& arg) {
  61   return (obj->*method)(context, arg.a, arg.b, arg.c, arg.d, arg.e);
  62 }
  63
  64 // Note that this only works for message with 1 or more parameters. For
  65 // 0-parameter messages you need to use the _0 version below (since there are
  66 // no params in the message).
  67 #define PPAPI_DISPATCH_HOST_RESOURCE_CALL(msg_class, member_func) \
  68     case msg_class::ID: { \
  69       TRACK_RUN_IN_IPC_HANDLER(member_func); \
  70       msg_class::Schema::Param p; \
  71       if (msg_class::Read(&ipc_message__, &p)) { \
  72         return ppapi::host::DispatchResourceCall( \
  73             this, \
  74             &_IpcMessageHandlerClass::member_func, \
  75             context, p); \
  76       } \
  77       return PP_ERROR_FAILED; \
  78     }
  79
  80 #define PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(msg_class, member_func) \
  81   case msg_class::ID: { \
  82     TRACK_RUN_IN_IPC_HANDLER(member_func); \
  83     return member_func(context); \
  84   }
  85
  86 }  // namespace host
  87 }  // namespace ppapi
  88
  89 #endif  // PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_