Kernel: Add a dedicated SetHleHandler method to ServerPort/ServerSession

This allows attaching a HLE handle to a ServerPort at any point after it
is created, allowing port/session creation to be generic between HLE and
regular services.

src/core/hle/kernel/client_port.cpp

@@ -26,20 +26,17 @@ ResultVal<SharedPtr<ClientSession>> ClientPort::Connect() {
     active_sessions++;
 
     // Create a new session pair, let the created sessions inherit the parent port's HLE handler.
-    auto sessions =
-        ServerSession::CreateSessionPair(server_port->GetName(), server_port->hle_handler, this);
-    auto client_session = std::get<SharedPtr<ClientSession>>(sessions);
-    auto server_session = std::get<SharedPtr<ServerSession>>(sessions);
+    auto sessions = ServerSession::CreateSessionPair(server_port->GetName(), this);
 
     if (server_port->hle_handler)
-        server_port->hle_handler->ClientConnected(server_session);
+        server_port->hle_handler->ClientConnected(std::get<SharedPtr<ServerSession>>(sessions));
     else
-        server_port->pending_sessions.push_back(std::move(server_session));
+        server_port->pending_sessions.push_back(std::get<SharedPtr<ServerSession>>(sessions));
 
     // Wake the threads waiting on the ServerPort
     server_port->WakeupAllWaitingThreads();
 
-    return MakeResult<SharedPtr<ClientSession>>(std::move(client_session));
+    return MakeResult(std::get<SharedPtr<ClientSession>>(sessions));
 }
 
 } // namespace

src/core/hle/kernel/hle_ipc.cpp

@@ -12,10 +12,12 @@
 namespace Kernel {
 
 void SessionRequestHandler::ClientConnected(SharedPtr<ServerSession> server_session) {
+    server_session->SetHleHandler(shared_from_this());
     connected_sessions.push_back(server_session);
 }
 
 void SessionRequestHandler::ClientDisconnected(SharedPtr<ServerSession> server_session) {
+    server_session->SetHleHandler(nullptr);
     boost::range::remove_erase(connected_sessions, server_session);
 }
 

src/core/hle/kernel/hle_ipc.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <memory>
 #include <vector>
 #include "core/hle/kernel/kernel.h"
 
@@ -16,7 +17,7 @@ class ServerSession;
  * This can be provided to a ServerSession in order to hook into several relevant events
  * (such as a new connection or a SyncRequest) so they can be implemented in the emulator.
  */
-class SessionRequestHandler {
+class SessionRequestHandler : public std::enable_shared_from_this<SessionRequestHandler> {
 public:
     /**
      * Handles a sync request from the emulated application.

src/core/hle/kernel/server_port.cpp

@@ -24,13 +24,12 @@ void ServerPort::Acquire(Thread* thread) {
 }
 
 std::tuple<SharedPtr<ServerPort>, SharedPtr<ClientPort>> ServerPort::CreatePortPair(
-    u32 max_sessions, std::string name, std::shared_ptr<SessionRequestHandler> hle_handler) {
+    u32 max_sessions, std::string name) {
 
     SharedPtr<ServerPort> server_port(new ServerPort);
     SharedPtr<ClientPort> client_port(new ClientPort);
 
     server_port->name = name + "_Server";
-    server_port->hle_handler = std::move(hle_handler);
     client_port->name = name + "_Client";
     client_port->server_port = server_port;
     client_port->max_sessions = max_sessions;

src/core/hle/kernel/server_port.h

@@ -20,15 +20,13 @@ class ServerPort final : public WaitObject {
 public:
     /**
      * Creates a pair of ServerPort and an associated ClientPort.
+     *
      * @param max_sessions Maximum number of sessions to the port
      * @param name Optional name of the ports
-     * @param hle_handler Optional HLE handler template for the port,
-     * ServerSessions crated from this port will inherit a reference to this handler.
      * @return The created port tuple
      */
     static std::tuple<SharedPtr<ServerPort>, SharedPtr<ClientPort>> CreatePortPair(
-        u32 max_sessions, std::string name = "UnknownPort",
-        std::shared_ptr<SessionRequestHandler> hle_handler = nullptr);
+        u32 max_sessions, std::string name = "UnknownPort");
 
     std::string GetTypeName() const override {
         return "ServerPort";
@@ -42,6 +40,14 @@ public:
         return HANDLE_TYPE;
     }
 
+    /**
+     * Sets the HLE handler template for the port. ServerSessions crated by connecting to this port
+     * will inherit a reference to this handler.
+     */
+    void SetHleHandler(std::shared_ptr<SessionRequestHandler> hle_handler_) {
+        hle_handler = std::move(hle_handler_);
+    }
+
     std::string name; ///< Name of port (optional)
 
     std::vector<SharedPtr<WaitObject>>

src/core/hle/kernel/server_session.cpp

@@ -28,16 +28,14 @@ ServerSession::~ServerSession() {
     parent->server = nullptr;
 }
 
-ResultVal<SharedPtr<ServerSession>> ServerSession::Create(
-    std::string name, std::shared_ptr<SessionRequestHandler> hle_handler) {
+ResultVal<SharedPtr<ServerSession>> ServerSession::Create(std::string name) {
     SharedPtr<ServerSession> server_session(new ServerSession);
 
     server_session->name = std::move(name);
     server_session->signaled = false;
-    server_session->hle_handler = std::move(hle_handler);
     server_session->parent = nullptr;
 
-    return MakeResult<SharedPtr<ServerSession>>(std::move(server_session));
+    return MakeResult(std::move(server_session));
 }
 
 bool ServerSession::ShouldWait(Thread* thread) const {
@@ -71,13 +69,9 @@ ResultCode ServerSession::HandleSyncRequest() {
     return RESULT_SUCCESS;
 }
 
-ServerSession::SessionPair ServerSession::CreateSessionPair(
-    const std::string& name, std::shared_ptr<SessionRequestHandler> hle_handler,
-    SharedPtr<ClientPort> port) {
-
-    auto server_session =
-        ServerSession::Create(name + "_Server", std::move(hle_handler)).MoveFrom();
-
+ServerSession::SessionPair ServerSession::CreateSessionPair(const std::string& name,
+                                                            SharedPtr<ClientPort> port) {
+    auto server_session = ServerSession::Create(name + "_Server").MoveFrom();
     SharedPtr<ClientSession> client_session(new ClientSession);
     client_session->name = name + "_Client";
 

src/core/hle/kernel/server_session.h

@@ -50,14 +50,20 @@ public:
     /**
      * Creates a pair of ServerSession and an associated ClientSession.
      * @param name        Optional name of the ports.
-     * @param hle_handler Optional HLE handler for this server session.
      * @param client_port Optional The ClientPort that spawned this session.
      * @return The created session tuple
      */
-    static SessionPair CreateSessionPair(
-        const std::string& name = "Unknown",
-        std::shared_ptr<SessionRequestHandler> hle_handler = nullptr,
-        SharedPtr<ClientPort> client_port = nullptr);
+    static SessionPair CreateSessionPair(const std::string& name = "Unknown",
+                                         SharedPtr<ClientPort> client_port = nullptr);
+
+    /**
+     * Sets the HLE handler for the session. This handler will be called to service IPC requests
+     * instead of the regular IPC machinery. (The regular IPC machinery is currently not
+     * implemented.)
+     */
+    void SetHleHandler(std::shared_ptr<SessionRequestHandler> hle_handler_) {
+        hle_handler = std::move(hle_handler_);
+    }
 
     /**
      * Handle a sync request from the emulated application.
@@ -83,11 +89,9 @@ private:
      * Creates a server session. The server session can have an optional HLE handler,
      * which will be invoked to handle the IPC requests that this session receives.
      * @param name Optional name of the server session.
-     * @param hle_handler Optional HLE handler for this server session.
      * @return The created server session
      */
-    static ResultVal<SharedPtr<ServerSession>> Create(
-        std::string name = "Unknown", std::shared_ptr<SessionRequestHandler> hle_handler = nullptr);
+    static ResultVal<SharedPtr<ServerSession>> Create(std::string name = "Unknown");
 };
 
 /**