HandleMessage.h   [plain text]

/*
 * Copyright (C) 2010-2016 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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 */

#pragma once

#include "ArgumentCoders.h"
#include <wtf/StdLibExtras.h>

namespace IPC {

class Connection;

// Dispatch functions with no reply arguments.

template <typename C, typename MF, typename ArgsTuple, size_t... ArgsIndex>
void callMemberFunctionImpl(C* object, MF function, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
{
    (object->*function)(std::get<ArgsIndex>(std::forward<ArgsTuple>(args))...);
}

template<typename C, typename MF, typename ArgsTuple, typename ArgsIndicies = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
void callMemberFunction(ArgsTuple&& args, C* object, MF function)
{
    callMemberFunctionImpl(object, function, std::forward<ArgsTuple>(args), ArgsIndicies());
}

// Dispatch functions with reply arguments.

template <typename C, typename MF, typename ArgsTuple, size_t... ArgsIndex, typename ReplyArgsTuple, size_t... ReplyArgsIndex>
void callMemberFunctionImpl(C* object, MF function, ArgsTuple&& args, ReplyArgsTuple& replyArgs, std::index_sequence<ArgsIndex...>, std::index_sequence<ReplyArgsIndex...>)
{
    (object->*function)(std::get<ArgsIndex>(std::forward<ArgsTuple>(args))..., std::get<ReplyArgsIndex>(replyArgs)...);
}

template <typename C, typename MF, typename ArgsTuple, typename ArgsIndicies = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>, typename ReplyArgsTuple, typename ReplyArgsIndicies = std::make_index_sequence<std::tuple_size<ReplyArgsTuple>::value>>
void callMemberFunction(ArgsTuple&& args, ReplyArgsTuple& replyArgs, C* object, MF function)
{
    callMemberFunctionImpl(object, function, std::forward<ArgsTuple>(args), replyArgs, ArgsIndicies(), ReplyArgsIndicies());
}

// Dispatch functions with delayed reply arguments.

template <typename C, typename MF, typename R, typename ArgsTuple, size_t... ArgsIndex>
void callMemberFunctionImpl(C* object, MF function, Ref<R>&& delayedReply, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
{
    (object->*function)(std::get<ArgsIndex>(args)..., WTFMove(delayedReply));
}

template<typename C, typename MF, typename R, typename ArgsTuple, typename ArgsIndicies = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
void callMemberFunction(ArgsTuple&& args, Ref<R>&& delayedReply, C* object, MF function)
{
    callMemberFunctionImpl(object, function, WTFMove(delayedReply), std::forward<ArgsTuple>(args), ArgsIndicies());
}

// Dispatch functions with connection parameter with no reply arguments.

template <typename C, typename MF, typename ArgsTuple, size_t... ArgsIndex>
void callMemberFunctionImpl(C* object, MF function, Connection& connection, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
{
    (object->*function)(connection, std::get<ArgsIndex>(std::forward<ArgsTuple>(args))...);
}

template<typename C, typename MF, typename ArgsTuple, typename ArgsIndicies = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
void callMemberFunction(Connection& connection, ArgsTuple&& args, C* object, MF function)
{
    callMemberFunctionImpl(object, function, connection, std::forward<ArgsTuple>(args), ArgsIndicies());
}

// Dispatch functions with connection parameter with reply arguments.

template <typename C, typename MF, typename ArgsTuple, size_t... ArgsIndex, typename ReplyArgsTuple, size_t... ReplyArgsIndex>
void callMemberFunctionImpl(C* object, MF function, Connection& connection, ArgsTuple&& args, ReplyArgsTuple& replyArgs, std::index_sequence<ArgsIndex...>, std::index_sequence<ReplyArgsIndex...>)
{
    (object->*function)(connection, std::get<ArgsIndex>(std::forward<ArgsTuple>(args))..., std::get<ReplyArgsIndex>(replyArgs)...);
}

template <typename C, typename MF, typename ArgsTuple, typename ArgsIndicies = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>, typename ReplyArgsTuple, typename ReplyArgsIndicies = std::make_index_sequence<std::tuple_size<ReplyArgsTuple>::value>>
void callMemberFunction(Connection& connection, ArgsTuple&& args, ReplyArgsTuple& replyArgs, C* object, MF function)
{
    callMemberFunctionImpl(object, function, connection, std::forward<ArgsTuple>(args), replyArgs, ArgsIndicies(), ReplyArgsIndicies());
}

// Main dispatch functions

template<typename T>
struct CodingType {
    typedef std::remove_const_t<std::remove_reference_t<T>> Type;
};

template<typename... Ts>
struct CodingType<std::tuple<Ts...>> {
    typedef std::tuple<typename CodingType<Ts>::Type...> Type;
};

template<typename T, typename C, typename MF>
void handleMessage(Decoder& decoder, C* object, MF function)
{
    typename CodingType<typename T::Arguments>::Type arguments;
    if (!decoder.decode(arguments)) {
        ASSERT(decoder.isInvalid());
        return;
    }

    callMemberFunction(WTFMove(arguments), object, function);
}

template<typename T, typename C, typename MF>
void handleMessage(Decoder& decoder, Encoder& replyEncoder, C* object, MF function)
{
    typename CodingType<typename T::Arguments>::Type arguments;
    if (!decoder.decode(arguments)) {
        ASSERT(decoder.isInvalid());
        return;
    }

    typename CodingType<typename T::Reply>::Type replyArguments;
    callMemberFunction(WTFMove(arguments), replyArguments, object, function);
    replyEncoder << replyArguments;
}

template<typename T, typename C, typename MF>
void handleMessage(Connection& connection, Decoder& decoder, Encoder& replyEncoder, C* object, MF function)
{
    typename CodingType<typename T::Arguments>::Type arguments;
    if (!decoder.decode(arguments)) {
        ASSERT(decoder.isInvalid());
        return;
    }

    typename CodingType<typename T::Reply>::Type replyArguments;
    callMemberFunction(connection, WTFMove(arguments), replyArguments, object, function);
    replyEncoder << replyArguments;
}

template<typename T, typename C, typename MF>
void handleMessage(Connection& connection, Decoder& decoder, C* object, MF function)
{
    typename CodingType<typename T::Arguments>::Type arguments;
    if (!decoder.decode(arguments)) {
        ASSERT(decoder.isInvalid());
        return;
    }
    callMemberFunction(connection, WTFMove(arguments), object, function);
}

template<typename T, typename C, typename MF>
void handleMessageDelayed(Connection& connection, Decoder& decoder, std::unique_ptr<Encoder>& replyEncoder, C* object, MF function)
{
    typename CodingType<typename T::Arguments>::Type arguments;
    if (!decoder.decode(arguments)) {
        ASSERT(decoder.isInvalid());
        return;
    }

    Ref<typename T::DelayedReply> delayedReply = adoptRef(*new typename T::DelayedReply(connection, WTFMove(replyEncoder)));
    callMemberFunction(WTFMove(arguments), WTFMove(delayedReply), object, function);
}

} // namespace IPC