19 files changed, 247 insertions, 72 deletions

diff --git a/src/core/hle/kernel/k_client_port.h b/src/core/hle/kernel/k_client_port.h
index 8501156e8..f2fff3b01 100644
--- a/src/core/hle/kernel/k_client_port.h
+++ b/src/core/hle/kernel/k_client_port.h
@@ -22,7 +22,7 @@ class KClientPort final : public KSynchronizationObject {
 
 public:
     explicit KClientPort(KernelCore& kernel_);
-    virtual ~KClientPort() override;
+    ~KClientPort() override;
 
     void Initialize(KPort* parent_, s32 max_sessions_, std::string&& name_);
     void OnSessionFinalized();
@@ -49,8 +49,8 @@ public:
     bool IsServerClosed() const;
 
     // Overridden virtual functions.
-    virtual void Destroy() override;
-    virtual bool IsSignaled() const override;
+    void Destroy() override;
+    bool IsSignaled() const override;
 
     ResultCode CreateSession(KClientSession** out);
 
diff --git a/src/core/hle/kernel/k_client_session.h b/src/core/hle/kernel/k_client_session.h
index 720a8c243..b11d5b4e3 100644
--- a/src/core/hle/kernel/k_client_session.h
+++ b/src/core/hle/kernel/k_client_session.h
@@ -34,7 +34,7 @@ class KClientSession final
 
 public:
     explicit KClientSession(KernelCore& kernel_);
-    virtual ~KClientSession();
+    ~KClientSession() override;
 
     void Initialize(KSession* parent_, std::string&& name_) {
         // Set member variables.
@@ -42,7 +42,7 @@ public:
         name = std::move(name_);
     }
 
-    virtual void Destroy() override;
+    void Destroy() override;
     static void PostDestroy([[maybe_unused]] uintptr_t arg) {}
 
     KSession* GetParent() const {
diff --git a/src/core/hle/kernel/k_event.h b/src/core/hle/kernel/k_event.h
index 9a59ffb70..3d3ec99e2 100644
--- a/src/core/hle/kernel/k_event.h
+++ b/src/core/hle/kernel/k_event.h
@@ -20,23 +20,21 @@ class KEvent final : public KAutoObjectWithSlabHeapAndContainer<KEvent, KAutoObj
 
 public:
     explicit KEvent(KernelCore& kernel_);
-    virtual ~KEvent();
+    ~KEvent() override;
 
     void Initialize(std::string&& name);
 
-    virtual void Finalize() override;
+    void Finalize() override;
 
-    virtual bool IsInitialized() const override {
+    bool IsInitialized() const override {
         return initialized;
     }
 
-    virtual uintptr_t GetPostDestroyArgument() const override {
+    uintptr_t GetPostDestroyArgument() const override {
         return reinterpret_cast<uintptr_t>(owner);
     }
 
-    static void PostDestroy(uintptr_t arg);
-
-    virtual KProcess* GetOwner() const override {
+    KProcess* GetOwner() const override {
         return owner;
     }
 
@@ -48,6 +46,8 @@ public:
         return writable_event;
     }
 
+    static void PostDestroy(uintptr_t arg);
+
 private:
     KReadableEvent readable_event;
     KWritableEvent writable_event;
diff --git a/src/core/hle/kernel/k_port.h b/src/core/hle/kernel/k_port.h
index 960f1f3a3..4018ea2df 100644
--- a/src/core/hle/kernel/k_port.h
+++ b/src/core/hle/kernel/k_port.h
@@ -22,7 +22,7 @@ class KPort final : public KAutoObjectWithSlabHeapAndContainer<KPort, KAutoObjec
 
 public:
     explicit KPort(KernelCore& kernel_);
-    virtual ~KPort();
+    ~KPort() override;
 
     static void PostDestroy([[maybe_unused]] uintptr_t arg) {}
 
@@ -59,7 +59,6 @@ private:
         ServerClosed = 3,
     };
 
-private:
     KServerPort server;
     KClientPort client;
     State state{State::Invalid};
diff --git a/src/core/hle/kernel/k_process.h b/src/core/hle/kernel/k_process.h
index 123d71cd3..c0656b9af 100644
--- a/src/core/hle/kernel/k_process.h
+++ b/src/core/hle/kernel/k_process.h
@@ -331,19 +331,19 @@ public:
 
     void LoadModule(CodeSet code_set, VAddr base_addr);
 
-    virtual bool IsInitialized() const override {
+    bool IsInitialized() const override {
         return is_initialized;
     }
 
     static void PostDestroy([[maybe_unused]] uintptr_t arg) {}
 
-    virtual void Finalize();
+    void Finalize() override;
 
-    virtual u64 GetId() const override final {
+    u64 GetId() const override {
         return GetProcessID();
     }
 
-    virtual bool IsSignaled() const override;
+    bool IsSignaled() const override;
 
     void PinCurrentThread();
     void UnpinCurrentThread();
diff --git a/src/core/hle/kernel/k_readable_event.h b/src/core/hle/kernel/k_readable_event.h
index 33cd1dd3e..b2850ac7b 100644
--- a/src/core/hle/kernel/k_readable_event.h
+++ b/src/core/hle/kernel/k_readable_event.h
@@ -31,8 +31,8 @@ public:
         return parent;
     }
 
-    virtual bool IsSignaled() const override;
-    virtual void Destroy() override;
+    bool IsSignaled() const override;
+    void Destroy() override;
 
     ResultCode Signal();
     ResultCode Clear();
diff --git a/src/core/hle/kernel/k_resource_limit.h b/src/core/hle/kernel/k_resource_limit.h
index 0debbbb51..fab6005ff 100644
--- a/src/core/hle/kernel/k_resource_limit.h
+++ b/src/core/hle/kernel/k_resource_limit.h
@@ -37,10 +37,10 @@ class KResourceLimit final
 
 public:
     explicit KResourceLimit(KernelCore& kernel_);
-    virtual ~KResourceLimit();
+    ~KResourceLimit() override;
 
     void Initialize(const Core::Timing::CoreTiming* core_timing_);
-    virtual void Finalize() override;
+    void Finalize() override;
 
     s64 GetLimitValue(LimitableResource which) const;
     s64 GetCurrentValue(LimitableResource which) const;
diff --git a/src/core/hle/kernel/k_server_port.h b/src/core/hle/kernel/k_server_port.h
index d1a757ec3..55481d63f 100644
--- a/src/core/hle/kernel/k_server_port.h
+++ b/src/core/hle/kernel/k_server_port.h
@@ -25,12 +25,9 @@ class SessionRequestHandler;
 class KServerPort final : public KSynchronizationObject {
     KERNEL_AUTOOBJECT_TRAITS(KServerPort, KSynchronizationObject);
 
-private:
-    using SessionList = boost::intrusive::list<KServerSession>;
-
 public:
     explicit KServerPort(KernelCore& kernel_);
-    virtual ~KServerPort() override;
+    ~KServerPort() override;
 
     void Initialize(KPort* parent_, std::string&& name_);
 
@@ -63,13 +60,14 @@ public:
     bool IsLight() const;
 
     // Overridden virtual functions.
-    virtual void Destroy() override;
-    virtual bool IsSignaled() const override;
+    void Destroy() override;
+    bool IsSignaled() const override;
 
 private:
+    using SessionList = boost::intrusive::list<KServerSession>;
+
     void CleanupSessions();
 
-private:
     SessionList session_list;
     SessionRequestHandlerPtr session_handler;
     KPort* parent{};
diff --git a/src/core/hle/kernel/k_server_session.h b/src/core/hle/kernel/k_server_session.h
index dd4de2904..27b757ad2 100644
--- a/src/core/hle/kernel/k_server_session.h
+++ b/src/core/hle/kernel/k_server_session.h
@@ -42,9 +42,9 @@ class KServerSession final : public KSynchronizationObject,
 
 public:
     explicit KServerSession(KernelCore& kernel_);
-    virtual ~KServerSession() override;
+    ~KServerSession() override;
 
-    virtual void Destroy() override;
+    void Destroy() override;
 
     void Initialize(KSession* parent_, std::string&& name_);
 
@@ -56,7 +56,7 @@ public:
         return parent;
     }
 
-    virtual bool IsSignaled() const override;
+    bool IsSignaled() const override;
 
     void OnClientClosed();
 
diff --git a/src/core/hle/kernel/k_session.h b/src/core/hle/kernel/k_session.h
index a981fd1f6..4ddd080d2 100644
--- a/src/core/hle/kernel/k_session.h
+++ b/src/core/hle/kernel/k_session.h
@@ -18,17 +18,17 @@ class KSession final : public KAutoObjectWithSlabHeapAndContainer<KSession, KAut
 
 public:
     explicit KSession(KernelCore& kernel_);
-    virtual ~KSession() override;
+    ~KSession() override;
 
     void Initialize(KClientPort* port_, const std::string& name_);
 
-    virtual void Finalize() override;
+    void Finalize() override;
 
-    virtual bool IsInitialized() const override {
+    bool IsInitialized() const override {
         return initialized;
     }
 
-    virtual uintptr_t GetPostDestroyArgument() const override {
+    uintptr_t GetPostDestroyArgument() const override {
         return reinterpret_cast<uintptr_t>(process);
     }
 
@@ -78,7 +78,6 @@ private:
         ServerClosed = 3,
     };
 
-private:
     void SetState(State state) {
         atomic_state = static_cast<u8>(state);
     }
@@ -87,7 +86,6 @@ private:
         return static_cast<State>(atomic_state.load(std::memory_order_relaxed));
     }
 
-private:
     KServerSession server;
     KClientSession client;
     std::atomic<std::underlying_type_t<State>> atomic_state{
diff --git a/src/core/hle/kernel/k_shared_memory.h b/src/core/hle/kernel/k_shared_memory.h
index 553a56327..e9815f90b 100644
--- a/src/core/hle/kernel/k_shared_memory.h
+++ b/src/core/hle/kernel/k_shared_memory.h
@@ -68,9 +68,9 @@ public:
         return device_memory->GetPointer(physical_address + offset);
     }
 
-    virtual void Finalize() override;
+    void Finalize() override;
 
-    virtual bool IsInitialized() const override {
+    bool IsInitialized() const override {
         return is_initialized;
     }
     static void PostDestroy([[maybe_unused]] uintptr_t arg) {}
diff --git a/src/core/hle/kernel/k_slab_heap.h b/src/core/hle/kernel/k_slab_heap.h
index 81d472a3e..0ad74b0a0 100644
--- a/src/core/hle/kernel/k_slab_heap.h
+++ b/src/core/hle/kernel/k_slab_heap.h
@@ -4,34 +4,213 @@
 
 #pragma once
 
+#include <atomic>
+
+#include "common/assert.h"
+#include "common/common_types.h"
+
 namespace Kernel {
 
 class KernelCore;
 
-/// This is a placeholder class to manage slab heaps for kernel objects. For now, we just allocate
-/// these with new/delete, but this can be re-implemented later to allocate these in emulated
-/// memory.
+namespace impl {
+
+class KSlabHeapImpl final : NonCopyable {
+public:
+    struct Node {
+        Node* next{};
+    };
+
+    constexpr KSlabHeapImpl() = default;
+
+    void Initialize(std::size_t size) {
+        ASSERT(head == nullptr);
+        obj_size = size;
+    }
+
+    constexpr std::size_t GetObjectSize() const {
+        return obj_size;
+    }
+
+    Node* GetHead() const {
+        return head;
+    }
+
+    void* Allocate() {
+        Node* ret = head.load();
+
+        do {
+            if (ret == nullptr) {
+                break;
+            }
+        } while (!head.compare_exchange_weak(ret, ret->next));
+
+        return ret;
+    }
+
+    void Free(void* obj) {
+        Node* node = static_cast<Node*>(obj);
+
+        Node* cur_head = head.load();
+        do {
+            node->next = cur_head;
+        } while (!head.compare_exchange_weak(cur_head, node));
+    }
+
+private:
+    std::atomic<Node*> head{};
+    std::size_t obj_size{};
+};
+
+} // namespace impl
+
+class KSlabHeapBase : NonCopyable {
+public:
+    constexpr KSlabHeapBase() = default;
+
+    constexpr bool Contains(uintptr_t addr) const {
+        return start <= addr && addr < end;
+    }
+
+    constexpr std::size_t GetSlabHeapSize() const {
+        return (end - start) / GetObjectSize();
+    }
+
+    constexpr std::size_t GetObjectSize() const {
+        return impl.GetObjectSize();
+    }
+
+    constexpr uintptr_t GetSlabHeapAddress() const {
+        return start;
+    }
+
+    std::size_t GetObjectIndexImpl(const void* obj) const {
+        return (reinterpret_cast<uintptr_t>(obj) - start) / GetObjectSize();
+    }
+
+    std::size_t GetPeakIndex() const {
+        return GetObjectIndexImpl(reinterpret_cast<const void*>(peak));
+    }
+
+    void* AllocateImpl() {
+        return impl.Allocate();
+    }
+
+    void FreeImpl(void* obj) {
+        // Don't allow freeing an object that wasn't allocated from this heap
+        ASSERT(Contains(reinterpret_cast<uintptr_t>(obj)));
+
+        impl.Free(obj);
+    }
+
+    void InitializeImpl(std::size_t obj_size, void* memory, std::size_t memory_size) {
+        // Ensure we don't initialize a slab using null memory
+        ASSERT(memory != nullptr);
+
+        // Initialize the base allocator
+        impl.Initialize(obj_size);
+
+        // Set our tracking variables
+        const std::size_t num_obj = (memory_size / obj_size);
+        start = reinterpret_cast<uintptr_t>(memory);
+        end = start + num_obj * obj_size;
+        peak = start;
+
+        // Free the objects
+        u8* cur = reinterpret_cast<u8*>(end);
+
+        for (std::size_t i{}; i < num_obj; i++) {
+            cur -= obj_size;
+            impl.Free(cur);
+        }
+    }
+
+private:
+    using Impl = impl::KSlabHeapImpl;
+
+    Impl impl;
+    uintptr_t peak{};
+    uintptr_t start{};
+    uintptr_t end{};
+};
 
 template <typename T>
-class KSlabHeap final : NonCopyable {
+class KSlabHeap final : public KSlabHeapBase {
 public:
-    KSlabHeap() = default;
+    enum class AllocationType {
+        Host,
+        Guest,
+    };
 
-    void Initialize([[maybe_unused]] void* memory, [[maybe_unused]] std::size_t memory_size) {
-        // Placeholder that should initialize the backing slab heap implementation.
+    explicit constexpr KSlabHeap(AllocationType allocation_type_ = AllocationType::Host)
+        : KSlabHeapBase(), allocation_type{allocation_type_} {}
+
+    void Initialize(void* memory, std::size_t memory_size) {
+        if (allocation_type == AllocationType::Guest) {
+            InitializeImpl(sizeof(T), memory, memory_size);
+        }
     }
 
     T* Allocate() {
-        return new T();
+        switch (allocation_type) {
+        case AllocationType::Host:
+            // Fallback for cases where we do not yet support allocating guest memory from the slab
+            // heap, such as for kernel memory regions.
+            return new T;
+
+        case AllocationType::Guest:
+            T* obj = static_cast<T*>(AllocateImpl());
+            if (obj != nullptr) {
+                new (obj) T();
+            }
+            return obj;
+        }
+
+        UNREACHABLE_MSG("Invalid AllocationType {}", allocation_type);
+        return nullptr;
     }
 
     T* AllocateWithKernel(KernelCore& kernel) {
-        return new T(kernel);
+        switch (allocation_type) {
+        case AllocationType::Host:
+            // Fallback for cases where we do not yet support allocating guest memory from the slab
+            // heap, such as for kernel memory regions.
+            return new T(kernel);
+
+        case AllocationType::Guest:
+            T* obj = static_cast<T*>(AllocateImpl());
+            if (obj != nullptr) {
+                new (obj) T(kernel);
+            }
+            return obj;
+        }
+
+        UNREACHABLE_MSG("Invalid AllocationType {}", allocation_type);
+        return nullptr;
     }
 
     void Free(T* obj) {
-        delete obj;
+        switch (allocation_type) {
+        case AllocationType::Host:
+            // Fallback for cases where we do not yet support allocating guest memory from the slab
+            // heap, such as for kernel memory regions.
+            delete obj;
+            return;
+
+        case AllocationType::Guest:
+            FreeImpl(obj);
+            return;
+        }
+
+        UNREACHABLE_MSG("Invalid AllocationType {}", allocation_type);
     }
+
+    constexpr std::size_t GetObjectIndex(const T* obj) const {
+        return GetObjectIndexImpl(obj);
+    }
+
+private:
+    const AllocationType allocation_type;
 };
 
 } // namespace Kernel
diff --git a/src/core/hle/kernel/k_synchronization_object.h b/src/core/hle/kernel/k_synchronization_object.h
index a41dd1220..3d4ce1fbc 100644
--- a/src/core/hle/kernel/k_synchronization_object.h
+++ b/src/core/hle/kernel/k_synchronization_object.h
@@ -29,7 +29,7 @@ public:
                                          KSynchronizationObject** objects, const s32 num_objects,
                                          s64 timeout);
 
-    virtual void Finalize() override;
+    void Finalize() override;
 
     [[nodiscard]] virtual bool IsSignaled() const = 0;
 
@@ -37,7 +37,7 @@ public:
 
 protected:
     explicit KSynchronizationObject(KernelCore& kernel);
-    virtual ~KSynchronizationObject();
+    ~KSynchronizationObject() override;
 
     virtual void OnFinalizeSynchronizationObject() {}
 
diff --git a/src/core/hle/kernel/k_thread.cpp b/src/core/hle/kernel/k_thread.cpp
index e3f08f256..3cf43d290 100644
--- a/src/core/hle/kernel/k_thread.cpp
+++ b/src/core/hle/kernel/k_thread.cpp
@@ -168,13 +168,13 @@ ResultCode KThread::Initialize(KThreadFunction func, uintptr_t arg, VAddr user_s
     std::memset(static_cast<void*>(std::addressof(GetStackParameters())), 0,
                 sizeof(StackParameters));
 
-    // Setup the TLS, if needed.
-    if (type == ThreadType::User) {
-        tls_address = owner->CreateTLSRegion();
-    }
-
     // Set parent, if relevant.
     if (owner != nullptr) {
+        // Setup the TLS, if needed.
+        if (type == ThreadType::User) {
+            tls_address = owner->CreateTLSRegion();
+        }
+
         parent = owner;
         parent->Open();
         parent->IncrementThreadCount();
diff --git a/src/core/hle/kernel/k_thread.h b/src/core/hle/kernel/k_thread.h
index 4abfc2b49..01eebb165 100644
--- a/src/core/hle/kernel/k_thread.h
+++ b/src/core/hle/kernel/k_thread.h
@@ -358,21 +358,21 @@ public:
         return termination_requested || GetRawState() == ThreadState::Terminated;
     }
 
-    [[nodiscard]] virtual u64 GetId() const override final {
+    [[nodiscard]] u64 GetId() const override {
         return this->GetThreadID();
     }
 
-    [[nodiscard]] virtual bool IsInitialized() const override {
+    [[nodiscard]] bool IsInitialized() const override {
         return initialized;
     }
 
-    [[nodiscard]] virtual uintptr_t GetPostDestroyArgument() const override {
+    [[nodiscard]] uintptr_t GetPostDestroyArgument() const override {
         return reinterpret_cast<uintptr_t>(parent) | (resource_limit_release_hint ? 1 : 0);
     }
 
-    virtual void Finalize() override;
+    void Finalize() override;
 
-    [[nodiscard]] virtual bool IsSignaled() const override;
+    [[nodiscard]] bool IsSignaled() const override;
 
     static void PostDestroy(uintptr_t arg);
 
diff --git a/src/core/hle/kernel/k_transfer_memory.h b/src/core/hle/kernel/k_transfer_memory.h
index c2d0f1eaf..31029a5c2 100644
--- a/src/core/hle/kernel/k_transfer_memory.h
+++ b/src/core/hle/kernel/k_transfer_memory.h
@@ -27,23 +27,23 @@ class KTransferMemory final
 
 public:
     explicit KTransferMemory(KernelCore& kernel_);
-    virtual ~KTransferMemory() override;
+    ~KTransferMemory() override;
 
     ResultCode Initialize(VAddr address_, std::size_t size_, Svc::MemoryPermission owner_perm_);
 
-    virtual void Finalize() override;
+    void Finalize() override;
 
-    virtual bool IsInitialized() const override {
+    bool IsInitialized() const override {
         return is_initialized;
     }
 
-    virtual uintptr_t GetPostDestroyArgument() const override {
+    uintptr_t GetPostDestroyArgument() const override {
         return reinterpret_cast<uintptr_t>(owner);
     }
 
     static void PostDestroy(uintptr_t arg);
 
-    KProcess* GetOwner() const {
+    KProcess* GetOwner() const override {
         return owner;
     }
 
diff --git a/src/core/hle/kernel/k_writable_event.h b/src/core/hle/kernel/k_writable_event.h
index 607b0eadb..858d982c4 100644
--- a/src/core/hle/kernel/k_writable_event.h
+++ b/src/core/hle/kernel/k_writable_event.h
@@ -21,7 +21,7 @@ public:
     explicit KWritableEvent(KernelCore& kernel_);
     ~KWritableEvent() override;
 
-    virtual void Destroy() override;
+    void Destroy() override;
 
     static void PostDestroy([[maybe_unused]] uintptr_t arg) {}
 
diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp
index 8b55df82e..0ffb78d51 100644
--- a/src/core/hle/kernel/kernel.cpp
+++ b/src/core/hle/kernel/kernel.cpp
@@ -258,7 +258,7 @@ struct KernelCore::Impl {
             KAutoObject::Create(thread.get());
             ASSERT(KThread::InitializeDummyThread(thread.get()).IsSuccess());
             thread->SetName(fmt::format("DummyThread:{}", GetHostThreadId()));
-            return std::move(thread);
+            return thread;
         };
 
         thread_local auto thread = make_thread();
@@ -620,7 +620,8 @@ struct KernelCore::Impl {
 
     void InitializePageSlab() {
         // Allocate slab heaps
-        user_slab_heap_pages = std::make_unique<KSlabHeap<Page>>();
+        user_slab_heap_pages =
+            std::make_unique<KSlabHeap<Page>>(KSlabHeap<Page>::AllocationType::Guest);
 
         // TODO(ameerj): This should be derived, not hardcoded within the kernel
         constexpr u64 user_slab_heap_size{0x3de000};
diff --git a/src/video_core/buffer_cache/buffer_cache.h b/src/video_core/buffer_cache/buffer_cache.h
index de971041f..9e6b87960 100644
--- a/src/video_core/buffer_cache/buffer_cache.h
+++ b/src/video_core/buffer_cache/buffer_cache.h
@@ -596,7 +596,7 @@ void BufferCache<P>::PopAsyncFlushes() {
             runtime.CopyBuffer(download_staging.buffer, slot_buffers[buffer_id], copies);
         }
         runtime.Finish();
-        for (const auto [copy, buffer_id] : downloads) {
+        for (const auto& [copy, buffer_id] : downloads) {
             const Buffer& buffer = slot_buffers[buffer_id];
             const VAddr cpu_addr = buffer.CpuAddr() + copy.src_offset;
             // Undo the modified offset
@@ -606,7 +606,7 @@ void BufferCache<P>::PopAsyncFlushes() {
         }
     } else {
         const std::span<u8> immediate_buffer = ImmediateBuffer(largest_copy);
-        for (const auto [copy, buffer_id] : downloads) {
+        for (const auto& [copy, buffer_id] : downloads) {
             Buffer& buffer = slot_buffers[buffer_id];
             buffer.ImmediateDownload(copy.src_offset, immediate_buffer.subspan(0, copy.size));
             const VAddr cpu_addr = buffer.CpuAddr() + copy.src_offset;