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
17namespace ppapi {
18namespace host {
19
20struct HostMessageContext;
21
22template <class ObjT, class Method>
23inline int32_t DispatchResourceCall(ObjT* obj, Method method,
24                                    HostMessageContext* context,
25                                    Tuple0& arg) {
26  return (obj->*method)(context);
27}
28
29template <class ObjT, class Method, class A>
30inline int32_t DispatchResourceCall(ObjT* obj, Method method,
31                                    HostMessageContext* context,
32                                    Tuple1<A>& arg) {
33  return (obj->*method)(context, arg.a);
34}
35
36template<class ObjT, class Method, class A, class B>
37inline 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
43template<class ObjT, class Method, class A, class B, class C>
44inline 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
50template<class ObjT, class Method, class A, class B, class C, class D>
51inline 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
57template<class ObjT, class Method, class A, class B, class C, class D, class E>
58inline 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