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"
  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                                     Tuple<>& 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                                     Tuple<A>& arg) {
  33   return (obj->*method)(context, get<0>(arg));
  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                                     Tuple<A, B>& arg) {
  40   return (obj->*method)(context, get<0>(arg), get<1>(arg));
  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                                     Tuple<A, B, C>& arg) {
  47   return (obj->*method)(context, get<0>(arg), get<1>(arg), get<2>(arg));
  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                                     Tuple<A, B, C, D>& arg) {
  54   return (obj->*method)(context, get<0>(arg), get<1>(arg), get<2>(arg),
  55                         get<3>(arg));
  56 }
  57
  58 template<class ObjT, class Method, class A, class B, class C, class D, class E>
  59 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
  60                                     HostMessageContext* context,
  61                                     Tuple<A, B, C, D, E>& arg) {
  62   return (obj->*method)(context, get<0>(arg), get<1>(arg), get<2>(arg),
  63                         get<3>(arg), get<4>(arg));
  64 }
  65
  66 // Note that this only works for message with 1 or more parameters. For
  67 // 0-parameter messages you need to use the _0 version below (since there are
  68 // no params in the message).
  69 #define PPAPI_DISPATCH_HOST_RESOURCE_CALL(msg_class, member_func) \
  70     case msg_class::ID: { \
  71       TRACK_RUN_IN_THIS_SCOPED_REGION(member_func); \
  72       msg_class::Schema::Param p; \
  73       if (msg_class::Read(&ipc_message__, &p)) { \
  74         return ppapi::host::DispatchResourceCall( \
  75             this, \
  76             &_IpcMessageHandlerClass::member_func, \
  77             context, p); \
  78       } \
  79       return PP_ERROR_FAILED; \
  80     }
  81
  82 #define PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(msg_class, member_func) \
  83   case msg_class::ID: { \
  84     TRACK_RUN_IN_THIS_SCOPED_REGION(member_func); \
  85     return member_func(context); \
  86   }
  87
  88 }  // namespace host
  89 }  // namespace ppapi
  90
  91 #endif  // PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_