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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <cstddef>
#include <string>
#include <boost/container/flat_map.hpp>
#include "common/common_types.h"
#include "core/hle/kernel/hle_ipc.h"
#include "core/hle/kernel/object.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
// Namespace Service
namespace Kernel {
class ClientPort;
class ServerPort;
class ServerSession;
class HLERequestContext;
} // namespace Kernel
namespace FileSys {
class VfsFilesystem;
}
namespace Service {
namespace SM {
class ServiceManager;
}
static const int kMaxPortSize = 8; ///< Maximum size of a port name (8 characters)
/// Arbitrary default number of maximum connections to an HLE service.
static const u32 DefaultMaxSessions = 10;
/**
* This is an non-templated base of ServiceFramework to reduce code bloat and compilation times, it
* is not meant to be used directly.
*
* @see ServiceFramework
*/
class ServiceFrameworkBase : public Kernel::SessionRequestHandler {
public:
/// Returns the string identifier used to connect to the service.
std::string GetServiceName() const {
return service_name;
}
/**
* Returns the maximum number of sessions that can be connected to this service at the same
* time.
*/
u32 GetMaxSessions() const {
return max_sessions;
}
/// Creates a port pair and registers this service with the given ServiceManager.
void InstallAsService(SM::ServiceManager& service_manager);
/// Creates a port pair and registers it on the kernel's global port registry.
void InstallAsNamedPort();
/// Creates and returns an unregistered port for the service.
Kernel::SharedPtr<Kernel::ClientPort> CreatePort();
void InvokeRequest(Kernel::HLERequestContext& ctx);
ResultCode HandleSyncRequest(Kernel::HLERequestContext& context) override;
protected:
/// Member-function pointer type of SyncRequest handlers.
template <typename Self>
using HandlerFnP = void (Self::*)(Kernel::HLERequestContext&);
private:
template <typename T>
friend class ServiceFramework;
struct FunctionInfoBase {
u32 expected_header;
HandlerFnP<ServiceFrameworkBase> handler_callback;
const char* name;
};
using InvokerFn = void(ServiceFrameworkBase* object, HandlerFnP<ServiceFrameworkBase> member,
Kernel::HLERequestContext& ctx);
ServiceFrameworkBase(const char* service_name, u32 max_sessions, InvokerFn* handler_invoker);
~ServiceFrameworkBase();
void RegisterHandlersBase(const FunctionInfoBase* functions, std::size_t n);
void ReportUnimplementedFunction(Kernel::HLERequestContext& ctx, const FunctionInfoBase* info);
/// Identifier string used to connect to the service.
std::string service_name;
/// Maximum number of concurrent sessions that this service can handle.
u32 max_sessions;
/// Flag to store if a port was already create/installed to detect multiple install attempts,
/// which is not supported.
bool port_installed = false;
/// Function used to safely up-cast pointers to the derived class before invoking a handler.
InvokerFn* handler_invoker;
boost::container::flat_map<u32, FunctionInfoBase> handlers;
};
/**
* Framework for implementing HLE services. Dispatches on the header id of incoming SyncRequests
* based on a table mapping header ids to handler functions. Service implementations should inherit
* from ServiceFramework using the CRTP (`class Foo : public ServiceFramework<Foo> { ... };`) and
* populate it with handlers by calling #RegisterHandlers.
*
* In order to avoid duplicating code in the binary and exposing too many implementation details in
* the header, this class is split into a non-templated base (ServiceFrameworkBase) and a template
* deriving from it (ServiceFramework). The functions in this class will mostly only erase the type
* of the passed in function pointers and then delegate the actual work to the implementation in the
* base class.
*/
template <typename Self>
class ServiceFramework : public ServiceFrameworkBase {
protected:
/// Contains information about a request type which is handled by the service.
struct FunctionInfo : FunctionInfoBase {
// TODO(yuriks): This function could be constexpr, but clang is the only compiler that
// doesn't emit an ICE or a wrong diagnostic because of the static_cast.
/**
* Constructs a FunctionInfo for a function.
*
* @param expected_header request header in the command buffer which will trigger dispatch
* to this handler
* @param handler_callback member function in this service which will be called to handle
* the request
* @param name human-friendly name for the request. Used mostly for logging purposes.
*/
FunctionInfo(u32 expected_header, HandlerFnP<Self> handler_callback, const char* name)
: FunctionInfoBase{
expected_header,
// Type-erase member function pointer by casting it down to the base class.
static_cast<HandlerFnP<ServiceFrameworkBase>>(handler_callback), name} {}
};
/**
* Initializes the handler with no functions installed.
* @param max_sessions Maximum number of sessions that can be
* connected to this service at the same time.
*/
explicit ServiceFramework(const char* service_name, u32 max_sessions = DefaultMaxSessions)
: ServiceFrameworkBase(service_name, max_sessions, Invoker) {}
/// Registers handlers in the service.
template <std::size_t N>
void RegisterHandlers(const FunctionInfo (&functions)[N]) {
RegisterHandlers(functions, N);
}
/**
* Registers handlers in the service. Usually prefer using the other RegisterHandlers
* overload in order to avoid needing to specify the array size.
*/
void RegisterHandlers(const FunctionInfo* functions, std::size_t n) {
RegisterHandlersBase(functions, n);
}
private:
/**
* This function is used to allow invocation of pointers to handlers stored in the base class
* without needing to expose the type of this derived class. Pointers-to-member may require a
* fixup when being up or downcast, and thus code that does that needs to know the concrete type
* of the derived class in order to invoke one of it's functions through a pointer.
*/
static void Invoker(ServiceFrameworkBase* object, HandlerFnP<ServiceFrameworkBase> member,
Kernel::HLERequestContext& ctx) {
// Cast back up to our original types and call the member function
(static_cast<Self*>(object)->*static_cast<HandlerFnP<Self>>(member))(ctx);
}
};
/// Initialize ServiceManager
void Init(std::shared_ptr<SM::ServiceManager>& sm, FileSys::VfsFilesystem& vfs);
/// Shutdown ServiceManager
void Shutdown();
} // namespace Service
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