Home | History | Annotate | Download | only in host 
      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                                     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_THIS_SCOPED_REGION(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_THIS_SCOPED_REGION(member_func); \
     83     return member_func(context); \
     84   }
     85 
     86 }  // namespace host
     87 }  // namespace ppapi
     88 
     89 #endif  // PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_
     90