core: Migrate current_process pointer to the kernel

Given we now have the kernel as a class, it doesn't make sense to keep
the current process pointer within the System class, as processes are
related to the kernel.

This also gets rid of a subtle case where memory wouldn't be freed on
core shutdown, as the current_process pointer would never be reset,
causing the pointed to contents to continue to live.

src/core/core.cpp

@@ -136,7 +136,7 @@ struct System::Impl {
         if (virtual_filesystem == nullptr)
             virtual_filesystem = std::make_shared<FileSys::RealVfsFilesystem>();
 
-        current_process = Kernel::Process::Create(kernel, "main");
+        kernel.MakeCurrentProcess(Kernel::Process::Create(kernel, "main"));
 
         cpu_barrier = std::make_shared<CpuBarrier>();
         cpu_exclusive_monitor = Cpu::MakeExclusiveMonitor(cpu_cores.size());
@@ -202,7 +202,7 @@ struct System::Impl {
             return init_result;
         }
 
-        const Loader::ResultStatus load_result{app_loader->Load(current_process)};
+        const Loader::ResultStatus load_result{app_loader->Load(kernel.CurrentProcess())};
         if (load_result != Loader::ResultStatus::Success) {
             LOG_CRITICAL(Core, "Failed to load ROM (Error {})!", static_cast<int>(load_result));
             Shutdown();
@@ -281,7 +281,6 @@ struct System::Impl {
     std::unique_ptr<VideoCore::RendererBase> renderer;
     std::unique_ptr<Tegra::GPU> gpu_core;
     std::shared_ptr<Tegra::DebugContext> debug_context;
-    Kernel::SharedPtr<Kernel::Process> current_process;
     std::shared_ptr<ExclusiveMonitor> cpu_exclusive_monitor;
     std::shared_ptr<CpuBarrier> cpu_barrier;
     std::array<std::shared_ptr<Cpu>, NUM_CPU_CORES> cpu_cores;
@@ -363,7 +362,11 @@ const std::shared_ptr<Kernel::Scheduler>& System::Scheduler(size_t core_index) {
 }
 
 Kernel::SharedPtr<Kernel::Process>& System::CurrentProcess() {
-    return impl->current_process;
+    return impl->kernel.CurrentProcess();
+}
+
+const Kernel::SharedPtr<Kernel::Process>& System::CurrentProcess() const {
+    return impl->kernel.CurrentProcess();
 }
 
 ARM_Interface& System::ArmInterface(size_t core_index) {

src/core/core.h

@@ -174,9 +174,12 @@ public:
     /// Gets the scheduler for the CPU core with the specified index
     const std::shared_ptr<Kernel::Scheduler>& Scheduler(size_t core_index);
 
-    /// Gets the current process
+    /// Provides a reference to the current process
     Kernel::SharedPtr<Kernel::Process>& CurrentProcess();
 
+    /// Provides a constant reference to the current process.
+    const Kernel::SharedPtr<Kernel::Process>& CurrentProcess() const;
+
     /// Provides a reference to the kernel instance.
     Kernel::KernelCore& Kernel();
 

src/core/hle/kernel/kernel.cpp

@@ -116,6 +116,7 @@ struct KernelCore::Impl {
         next_thread_id = 1;
 
         process_list.clear();
+        current_process.reset();
 
         handle_table.Clear();
         resource_limits.fill(nullptr);
@@ -206,6 +207,7 @@ struct KernelCore::Impl {
 
     // Lists all processes that exist in the current session.
     std::vector<SharedPtr<Process>> process_list;
+    SharedPtr<Process> current_process;
 
     Kernel::HandleTable handle_table;
     std::array<SharedPtr<ResourceLimit>, 4> resource_limits;
@@ -264,6 +266,18 @@ void KernelCore::AppendNewProcess(SharedPtr<Process> process) {
     impl->process_list.push_back(std::move(process));
 }
 
+void KernelCore::MakeCurrentProcess(SharedPtr<Process> process) {
+    impl->current_process = std::move(process);
+}
+
+SharedPtr<Process>& KernelCore::CurrentProcess() {
+    return impl->current_process;
+}
+
+const SharedPtr<Process>& KernelCore::CurrentProcess() const {
+    return impl->current_process;
+}
+
 void KernelCore::AddNamedPort(std::string name, SharedPtr<ClientPort> port) {
     impl->named_ports.emplace(std::move(name), std::move(port));
 }

src/core/hle/kernel/kernel.h

@@ -65,6 +65,15 @@ public:
     /// Adds the given shared pointer to an internal list of active processes.
     void AppendNewProcess(SharedPtr<Process> process);
 
+    /// Makes the given process the new current process.
+    void MakeCurrentProcess(SharedPtr<Process> process);
+
+    /// Retrieves a reference to the current process.
+    SharedPtr<Process>& CurrentProcess();
+
+    /// Retrieves a const reference to the current process.
+    const SharedPtr<Process>& CurrentProcess() const;
+
     /// Adds a port to the named port table
     void AddNamedPort(std::string name, SharedPtr<ClientPort> port);