2 files changed, 50 insertions, 71 deletions

diff --git a/src/core/core.cpp b/src/core/core.cpp
index bb268a319..3532839df 100644
--- a/src/core/core.cpp
+++ b/src/core/core.cpp
@@ -139,8 +139,8 @@ struct System::Impl {
         : kernel{system}, fs_controller{system}, memory{system},
           cpu_manager{system}, reporter{system}, applet_manager{system}, time_manager{system} {}
 
-    ResultStatus Run() {
-        status = ResultStatus::Success;
+    SystemResultStatus Run() {
+        status = SystemResultStatus::Success;
 
         kernel.Suspend(false);
         core_timing.SyncPause(false);
@@ -149,8 +149,8 @@ struct System::Impl {
         return status;
     }
 
-    ResultStatus Pause() {
-        status = ResultStatus::Success;
+    SystemResultStatus Pause() {
+        status = SystemResultStatus::Success;
 
         core_timing.SyncPause(true);
         kernel.Suspend(true);
@@ -159,7 +159,7 @@ struct System::Impl {
         return status;
     }
 
-    ResultStatus Init(System& system, Frontend::EmuWindow& emu_window) {
+    SystemResultStatus Init(System& system, Frontend::EmuWindow& emu_window) {
         LOG_DEBUG(Core, "initialized OK");
 
         device_memory = std::make_unique<Core::DeviceMemory>();
@@ -197,7 +197,7 @@ struct System::Impl {
 
         gpu_core = VideoCore::CreateGPU(emu_window, system);
         if (!gpu_core) {
-            return ResultStatus::ErrorVideoCore;
+            return SystemResultStatus::ErrorVideoCore;
         }
 
         service_manager = std::make_shared<Service::SM::ServiceManager>(kernel);
@@ -217,21 +217,22 @@ struct System::Impl {
 
         LOG_DEBUG(Core, "Initialized OK");
 
-        return ResultStatus::Success;
+        return SystemResultStatus::Success;
     }
 
-    ResultStatus Load(System& system, Frontend::EmuWindow& emu_window, const std::string& filepath,
-                      u64 program_id, std::size_t program_index) {
+    SystemResultStatus Load(System& system, Frontend::EmuWindow& emu_window,
+                            const std::string& filepath, u64 program_id,
+                            std::size_t program_index) {
         app_loader = Loader::GetLoader(system, GetGameFileFromPath(virtual_filesystem, filepath),
                                        program_id, program_index);
 
         if (!app_loader) {
             LOG_CRITICAL(Core, "Failed to obtain loader for {}!", filepath);
-            return ResultStatus::ErrorGetLoader;
+            return SystemResultStatus::ErrorGetLoader;
         }
 
-        ResultStatus init_result{Init(system, emu_window)};
-        if (init_result != ResultStatus::Success) {
+        SystemResultStatus init_result{Init(system, emu_window)};
+        if (init_result != SystemResultStatus::Success) {
             LOG_CRITICAL(Core, "Failed to initialize system (Error {})!",
                          static_cast<int>(init_result));
             Shutdown();
@@ -249,8 +250,8 @@ struct System::Impl {
             LOG_CRITICAL(Core, "Failed to load ROM (Error {})!", load_result);
             Shutdown();
 
-            return static_cast<ResultStatus>(static_cast<u32>(ResultStatus::ErrorLoader) +
-                                             static_cast<u32>(load_result));
+            return static_cast<SystemResultStatus>(
+                static_cast<u32>(SystemResultStatus::ErrorLoader) + static_cast<u32>(load_result));
         }
         AddGlueRegistrationForProcess(*app_loader, *main_process);
         kernel.MakeCurrentProcess(main_process.get());
@@ -282,7 +283,7 @@ struct System::Impl {
         GetAndResetPerfStats();
         perf_stats->BeginSystemFrame();
 
-        status = ResultStatus::Success;
+        status = SystemResultStatus::Success;
         return status;
     }
 
@@ -355,7 +356,7 @@ struct System::Impl {
         arp_manager.Register(launch.title_id, launch, std::move(nacp_data));
     }
 
-    void SetStatus(ResultStatus new_status, const char* details = nullptr) {
+    void SetStatus(SystemResultStatus new_status, const char* details = nullptr) {
         status = new_status;
         if (details) {
             status_details = details;
@@ -411,7 +412,7 @@ struct System::Impl {
     /// Network instance
     Network::NetworkInstance network_instance;
 
-    ResultStatus status = ResultStatus::Success;
+    SystemResultStatus status = SystemResultStatus::Success;
     std::string status_details = "";
 
     std::unique_ptr<Core::PerfStats> perf_stats;
@@ -428,21 +429,8 @@ struct System::Impl {
 };
 
 System::System() : impl{std::make_unique<Impl>(*this)} {}
-System::~System() = default;
-
-System& System::GetInstance() {
-    if (!s_instance) {
-        throw std::runtime_error("Using System instance before its initialization");
-    }
-    return *s_instance;
-}
 
-void System::InitializeGlobalInstance() {
-    if (s_instance) {
-        throw std::runtime_error("Reinitializing Global System instance.");
-    }
-    s_instance = std::unique_ptr<System>(new System);
-}
+System::~System() = default;
 
 CpuManager& System::GetCpuManager() {
     return impl->cpu_manager;
@@ -452,16 +440,16 @@ const CpuManager& System::GetCpuManager() const {
     return impl->cpu_manager;
 }
 
-System::ResultStatus System::Run() {
+SystemResultStatus System::Run() {
     return impl->Run();
 }
 
-System::ResultStatus System::Pause() {
+SystemResultStatus System::Pause() {
     return impl->Pause();
 }
 
-System::ResultStatus System::SingleStep() {
-    return ResultStatus::Success;
+SystemResultStatus System::SingleStep() {
+    return SystemResultStatus::Success;
 }
 
 void System::InvalidateCpuInstructionCaches() {
@@ -476,8 +464,8 @@ void System::Shutdown() {
     impl->Shutdown();
 }
 
-System::ResultStatus System::Load(Frontend::EmuWindow& emu_window, const std::string& filepath,
-                                  u64 program_id, std::size_t program_index) {
+SystemResultStatus System::Load(Frontend::EmuWindow& emu_window, const std::string& filepath,
+                                u64 program_id, std::size_t program_index) {
     return impl->Load(*this, emu_window, filepath, program_id, program_index);
 }
 
@@ -637,7 +625,7 @@ Loader::ResultStatus System::GetGameName(std::string& out) const {
     return impl->GetGameName(out);
 }
 
-void System::SetStatus(ResultStatus new_status, const char* details) {
+void System::SetStatus(SystemResultStatus new_status, const char* details) {
     impl->SetStatus(new_status, details);
 }
 
diff --git a/src/core/core.h b/src/core/core.h
index a796472b2..c1234ef77 100644
--- a/src/core/core.h
+++ b/src/core/core.h
@@ -104,55 +104,49 @@ struct PerfStatsResults;
 FileSys::VirtualFile GetGameFileFromPath(const FileSys::VirtualFilesystem& vfs,
                                          const std::string& path);
 
+/// Enumeration representing the return values of the System Initialize and Load process.
+enum class SystemResultStatus : u32 {
+    Success,             ///< Succeeded
+    ErrorNotInitialized, ///< Error trying to use core prior to initialization
+    ErrorGetLoader,      ///< Error finding the correct application loader
+    ErrorSystemFiles,    ///< Error in finding system files
+    ErrorSharedFont,     ///< Error in finding shared font
+    ErrorVideoCore,      ///< Error in the video core
+    ErrorUnknown,        ///< Any other error
+    ErrorLoader,         ///< The base for loader errors (too many to repeat)
+};
+
 class System {
 public:
     using CurrentBuildProcessID = std::array<u8, 0x20>;
 
+    explicit System();
+
+    ~System();
+
     System(const System&) = delete;
     System& operator=(const System&) = delete;
 
     System(System&&) = delete;
     System& operator=(System&&) = delete;
 
-    ~System();
-
-    /**
-     * Gets the instance of the System singleton class.
-     * @returns Reference to the instance of the System singleton class.
-     */
-    [[deprecated("Use of the global system instance is deprecated")]] static System& GetInstance();
-
-    static void InitializeGlobalInstance();
-
-    /// Enumeration representing the return values of the System Initialize and Load process.
-    enum class ResultStatus : u32 {
-        Success,             ///< Succeeded
-        ErrorNotInitialized, ///< Error trying to use core prior to initialization
-        ErrorGetLoader,      ///< Error finding the correct application loader
-        ErrorSystemFiles,    ///< Error in finding system files
-        ErrorSharedFont,     ///< Error in finding shared font
-        ErrorVideoCore,      ///< Error in the video core
-        ErrorUnknown,        ///< Any other error
-        ErrorLoader,         ///< The base for loader errors (too many to repeat)
-    };
-
     /**
      * Run the OS and Application
      * This function will start emulation and run the relevant devices
      */
-    [[nodiscard]] ResultStatus Run();
+    [[nodiscard]] SystemResultStatus Run();
 
     /**
      * Pause the OS and Application
      * This function will pause emulation and stop the relevant devices
      */
-    [[nodiscard]] ResultStatus Pause();
+    [[nodiscard]] SystemResultStatus Pause();
 
     /**
      * Step the CPU one instruction
      * @return Result status, indicating whether or not the operation succeeded.
      */
-    [[nodiscard]] ResultStatus SingleStep();
+    [[nodiscard]] SystemResultStatus SingleStep();
 
     /**
      * Invalidate the CPU instruction caches
@@ -172,10 +166,11 @@ public:
      *                   input.
      * @param filepath String path to the executable application to load on the host file system.
      * @param program_index Specifies the index within the container of the program to launch.
-     * @returns ResultStatus code, indicating if the operation succeeded.
+     * @returns SystemResultStatus code, indicating if the operation succeeded.
      */
-    [[nodiscard]] ResultStatus Load(Frontend::EmuWindow& emu_window, const std::string& filepath,
-                                    u64 program_id = 0, std::size_t program_index = 0);
+    [[nodiscard]] SystemResultStatus Load(Frontend::EmuWindow& emu_window,
+                                          const std::string& filepath, u64 program_id = 0,
+                                          std::size_t program_index = 0);
 
     /**
      * Indicates if the emulated system is powered on (all subsystems initialized and able to run an
@@ -301,7 +296,7 @@ public:
     /// Gets the name of the current game
     [[nodiscard]] Loader::ResultStatus GetGameName(std::string& out) const;
 
-    void SetStatus(ResultStatus new_status, const char* details);
+    void SetStatus(SystemResultStatus new_status, const char* details);
 
     [[nodiscard]] const std::string& GetStatusDetails() const;
 
@@ -403,12 +398,8 @@ public:
     void ApplySettings();
 
 private:
-    System();
-
     struct Impl;
     std::unique_ptr<Impl> impl;
-
-    inline static std::unique_ptr<System> s_instance{};
 };
 
 } // namespace Core