// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_DAWN_NATIVE_DEVICE_H_
#define SRC_DAWN_NATIVE_DEVICE_H_

#include <memory>
#include <mutex>
#include <string>
#include <unordered_set>
#include <utility>
#include <vector>

#include "dawn/native/CacheKey.h"
#include "dawn/native/Commands.h"
#include "dawn/native/ComputePipeline.h"
#include "dawn/native/Error.h"
#include "dawn/native/Features.h"
#include "dawn/native/Format.h"
#include "dawn/native/Forward.h"
#include "dawn/native/Limits.h"
#include "dawn/native/ObjectBase.h"
#include "dawn/native/ObjectType_autogen.h"
#include "dawn/native/RefCountedWithExternalCount.h"
#include "dawn/native/StagingBuffer.h"
#include "dawn/native/Toggles.h"

#include "dawn/native/DawnNative.h"
#include "dawn/native/dawn_platform.h"

namespace dawn::platform {
class WorkerTaskPool;
}  // namespace dawn::platform

namespace dawn::native {
class AsyncTaskManager;
class AttachmentState;
class AttachmentStateBlueprint;
class Blob;
class BlobCache;
class CallbackTaskManager;
class DynamicUploader;
class ErrorScopeStack;
class OwnedCompilationMessages;
struct CallbackTask;
struct InternalPipelineStore;
struct ShaderModuleParseResult;

using WGSLExtensionSet = std::unordered_set<std::string>;

class DeviceBase : public RefCountedWithExternalCount {
  public:
    DeviceBase(AdapterBase* adapter, const DeviceDescriptor* descriptor);
    ~DeviceBase() override;

    void HandleError(InternalErrorType type, const char* message);

    bool ConsumedError(MaybeError maybeError) {
        if (DAWN_UNLIKELY(maybeError.IsError())) {
            ConsumeError(maybeError.AcquireError());
            return true;
        }
        return false;
    }

    template <typename T>
    bool ConsumedError(ResultOrError<T> resultOrError, T* result) {
        if (DAWN_UNLIKELY(resultOrError.IsError())) {
            ConsumeError(resultOrError.AcquireError());
            return true;
        }
        *result = resultOrError.AcquireSuccess();
        return false;
    }

    template <typename... Args>
    bool ConsumedError(MaybeError maybeError, const char* formatStr, const Args&... args) {
        if (DAWN_UNLIKELY(maybeError.IsError())) {
            std::unique_ptr<ErrorData> error = maybeError.AcquireError();
            if (error->GetType() == InternalErrorType::Validation) {
                std::string out;
                absl::UntypedFormatSpec format(formatStr);
                if (absl::FormatUntyped(&out, format, {absl::FormatArg(args)...})) {
                    error->AppendContext(std::move(out));
                } else {
                    error->AppendContext(
                        absl::StrFormat("[Failed to format error: \"%s\"]", formatStr));
                }
            }
            ConsumeError(std::move(error));
            return true;
        }
        return false;
    }

    template <typename T, typename... Args>
    bool ConsumedError(ResultOrError<T> resultOrError,
                       T* result,
                       const char* formatStr,
                       const Args&... args) {
        if (DAWN_UNLIKELY(resultOrError.IsError())) {
            std::unique_ptr<ErrorData> error = resultOrError.AcquireError();
            if (error->GetType() == InternalErrorType::Validation) {
                std::string out;
                absl::UntypedFormatSpec format(formatStr);
                if (absl::FormatUntyped(&out, format, {absl::FormatArg(args)...})) {
                    error->AppendContext(std::move(out));
                } else {
                    error->AppendContext(
                        absl::StrFormat("[Failed to format error: \"%s\"]", formatStr));
                }
            }
            ConsumeError(std::move(error));
            return true;
        }
        *result = resultOrError.AcquireSuccess();
        return false;
    }

    MaybeError ValidateObject(const ApiObjectBase* object) const;

    AdapterBase* GetAdapter() const;
    dawn::platform::Platform* GetPlatform() const;

    // Returns the Format corresponding to the wgpu::TextureFormat or an error if the format
    // isn't a valid wgpu::TextureFormat or isn't supported by this device.
    // The pointer returned has the same lifetime as the device.
    ResultOrError<const Format*> GetInternalFormat(wgpu::TextureFormat format) const;

    // Returns the Format corresponding to the wgpu::TextureFormat and assumes the format is
    // valid and supported.
    // The reference returned has the same lifetime as the device.
    const Format& GetValidInternalFormat(wgpu::TextureFormat format) const;
    const Format& GetValidInternalFormat(FormatIndex formatIndex) const;

    virtual ResultOrError<Ref<CommandBufferBase>> CreateCommandBuffer(
        CommandEncoder* encoder,
        const CommandBufferDescriptor* descriptor) = 0;

    ExecutionSerial GetCompletedCommandSerial() const;
    ExecutionSerial GetLastSubmittedCommandSerial() const;
    ExecutionSerial GetFutureSerial() const;
    ExecutionSerial GetPendingCommandSerial() const;

    // Many Dawn objects are completely immutable once created which means that if two
    // creations are given the same arguments, they can return the same object. Reusing
    // objects will help make comparisons between objects by a single pointer comparison.
    //
    // Technically no object is immutable as they have a reference count, and an
    // application with reference-counting issues could "see" that objects are reused.
    // This is solved by automatic-reference counting, and also the fact that when using
    // the client-server wire every creation will get a different proxy object, with a
    // different reference count.
    //
    // When trying to create an object, we give both the descriptor and an example of what
    // the created object will be, the "blueprint". The blueprint is just a FooBase object
    // instead of a backend Foo object. If the blueprint doesn't match an object in the
    // cache, then the descriptor is used to make a new object.
    ResultOrError<Ref<BindGroupLayoutBase>> GetOrCreateBindGroupLayout(
        const BindGroupLayoutDescriptor* descriptor,
        PipelineCompatibilityToken pipelineCompatibilityToken = PipelineCompatibilityToken(0));
    void UncacheBindGroupLayout(BindGroupLayoutBase* obj);

    BindGroupLayoutBase* GetEmptyBindGroupLayout();

    void UncacheComputePipeline(ComputePipelineBase* obj);

    ResultOrError<Ref<TextureViewBase>> GetOrCreatePlaceholderTextureViewForExternalTexture();

    ResultOrError<Ref<PipelineLayoutBase>> GetOrCreatePipelineLayout(
        const PipelineLayoutDescriptor* descriptor);
    void UncachePipelineLayout(PipelineLayoutBase* obj);

    void UncacheRenderPipeline(RenderPipelineBase* obj);

    ResultOrError<Ref<SamplerBase>> GetOrCreateSampler(const SamplerDescriptor* descriptor);
    void UncacheSampler(SamplerBase* obj);

    ResultOrError<Ref<ShaderModuleBase>> GetOrCreateShaderModule(
        const ShaderModuleDescriptor* descriptor,
        ShaderModuleParseResult* parseResult,
        OwnedCompilationMessages* compilationMessages);
    void UncacheShaderModule(ShaderModuleBase* obj);

    Ref<AttachmentState> GetOrCreateAttachmentState(AttachmentStateBlueprint* blueprint);
    Ref<AttachmentState> GetOrCreateAttachmentState(
        const RenderBundleEncoderDescriptor* descriptor);
    Ref<AttachmentState> GetOrCreateAttachmentState(const RenderPipelineDescriptor* descriptor);
    Ref<AttachmentState> GetOrCreateAttachmentState(const RenderPassDescriptor* descriptor);
    void UncacheAttachmentState(AttachmentState* obj);

    Ref<PipelineCacheBase> GetOrCreatePipelineCache(const CacheKey& key);

    // Object creation methods that be used in a reentrant manner.
    ResultOrError<Ref<BindGroupBase>> CreateBindGroup(const BindGroupDescriptor* descriptor);
    ResultOrError<Ref<BindGroupLayoutBase>> CreateBindGroupLayout(
        const BindGroupLayoutDescriptor* descriptor,
        bool allowInternalBinding = false);
    ResultOrError<Ref<BufferBase>> CreateBuffer(const BufferDescriptor* descriptor);
    ResultOrError<Ref<CommandEncoder>> CreateCommandEncoder(
        const CommandEncoderDescriptor* descriptor = nullptr);
    ResultOrError<Ref<ComputePipelineBase>> CreateComputePipeline(
        const ComputePipelineDescriptor* descriptor);
    MaybeError CreateComputePipelineAsync(const ComputePipelineDescriptor* descriptor,
                                          WGPUCreateComputePipelineAsyncCallback callback,
                                          void* userdata);

    ResultOrError<Ref<PipelineLayoutBase>> CreatePipelineLayout(
        const PipelineLayoutDescriptor* descriptor);
    ResultOrError<Ref<QuerySetBase>> CreateQuerySet(const QuerySetDescriptor* descriptor);
    ResultOrError<Ref<RenderBundleEncoder>> CreateRenderBundleEncoder(
        const RenderBundleEncoderDescriptor* descriptor);
    ResultOrError<Ref<RenderPipelineBase>> CreateRenderPipeline(
        const RenderPipelineDescriptor* descriptor);
    MaybeError CreateRenderPipelineAsync(const RenderPipelineDescriptor* descriptor,
                                         WGPUCreateRenderPipelineAsyncCallback callback,
                                         void* userdata);
    ResultOrError<Ref<SamplerBase>> CreateSampler(const SamplerDescriptor* descriptor = nullptr);
    ResultOrError<Ref<ShaderModuleBase>> CreateShaderModule(
        const ShaderModuleDescriptor* descriptor,
        OwnedCompilationMessages* compilationMessages = nullptr);
    ResultOrError<Ref<SwapChainBase>> CreateSwapChain(Surface* surface,
                                                      const SwapChainDescriptor* descriptor);
    ResultOrError<Ref<TextureBase>> CreateTexture(const TextureDescriptor* descriptor);
    ResultOrError<Ref<TextureViewBase>> CreateTextureView(TextureBase* texture,
                                                          const TextureViewDescriptor* descriptor);

    // Implementation of API object creation methods. DO NOT use them in a reentrant manner.
    BindGroupBase* APICreateBindGroup(const BindGroupDescriptor* descriptor);
    BindGroupLayoutBase* APICreateBindGroupLayout(const BindGroupLayoutDescriptor* descriptor);
    BufferBase* APICreateBuffer(const BufferDescriptor* descriptor);
    CommandEncoder* APICreateCommandEncoder(const CommandEncoderDescriptor* descriptor);
    ComputePipelineBase* APICreateComputePipeline(const ComputePipelineDescriptor* descriptor);
    PipelineLayoutBase* APICreatePipelineLayout(const PipelineLayoutDescriptor* descriptor);
    QuerySetBase* APICreateQuerySet(const QuerySetDescriptor* descriptor);
    void APICreateComputePipelineAsync(const ComputePipelineDescriptor* descriptor,
                                       WGPUCreateComputePipelineAsyncCallback callback,
                                       void* userdata);
    void APICreateRenderPipelineAsync(const RenderPipelineDescriptor* descriptor,
                                      WGPUCreateRenderPipelineAsyncCallback callback,
                                      void* userdata);
    RenderBundleEncoder* APICreateRenderBundleEncoder(
        const RenderBundleEncoderDescriptor* descriptor);
    RenderPipelineBase* APICreateRenderPipeline(const RenderPipelineDescriptor* descriptor);
    ExternalTextureBase* APICreateExternalTexture(const ExternalTextureDescriptor* descriptor);
    SamplerBase* APICreateSampler(const SamplerDescriptor* descriptor);
    ShaderModuleBase* APICreateShaderModule(const ShaderModuleDescriptor* descriptor);
    SwapChainBase* APICreateSwapChain(Surface* surface, const SwapChainDescriptor* descriptor);
    TextureBase* APICreateTexture(const TextureDescriptor* descriptor);

    InternalPipelineStore* GetInternalPipelineStore();

    // For Dawn Wire
    BufferBase* APICreateErrorBuffer();

    ExternalTextureBase* APICreateErrorExternalTexture();

    QueueBase* APIGetQueue();

    bool APIGetLimits(SupportedLimits* limits) const;
    // Note that we should not use this function to query the features which can only be enabled
    // behind toggles (use IsFeatureEnabled() instead).
    bool APIHasFeature(wgpu::FeatureName feature) const;
    // Note that we should not use this function to query the features which can only be enabled
    // behind toggles (use IsFeatureEnabled() instead).
    size_t APIEnumerateFeatures(wgpu::FeatureName* features) const;
    void APIInjectError(wgpu::ErrorType type, const char* message);
    bool APITick();

    void APISetDeviceLostCallback(wgpu::DeviceLostCallback callback, void* userdata);
    void APISetUncapturedErrorCallback(wgpu::ErrorCallback callback, void* userdata);
    void APISetLoggingCallback(wgpu::LoggingCallback callback, void* userdata);
    void APIPushErrorScope(wgpu::ErrorFilter filter);
    bool APIPopErrorScope(wgpu::ErrorCallback callback, void* userdata);

    MaybeError ValidateIsAlive() const;

    BlobCache* GetBlobCache();
    Blob LoadCachedBlob(const CacheKey& key);
    void StoreCachedBlob(const CacheKey& key, const Blob& blob);

    virtual ResultOrError<std::unique_ptr<StagingBufferBase>> CreateStagingBuffer(size_t size) = 0;
    virtual MaybeError CopyFromStagingToBuffer(StagingBufferBase* source,
                                               uint64_t sourceOffset,
                                               BufferBase* destination,
                                               uint64_t destinationOffset,
                                               uint64_t size) = 0;
    virtual MaybeError CopyFromStagingToTexture(const StagingBufferBase* source,
                                                const TextureDataLayout& src,
                                                TextureCopy* dst,
                                                const Extent3D& copySizePixels) = 0;

    DynamicUploader* GetDynamicUploader() const;

    // The device state which is a combination of creation state and loss state.
    //
    //   - BeingCreated: the device didn't finish creation yet and the frontend cannot be used
    //     (both for the application calling WebGPU, or re-entrant calls). No work exists on
    //     the GPU timeline.
    //   - Alive: the device is usable and might have work happening on the GPU timeline.
    //   - BeingDisconnected: the device is no longer usable because we are waiting for all
    //     work on the GPU timeline to finish. (this is to make validation prevent the
    //     application from adding more work during the transition from Available to
    //     Disconnected)
    //   - Disconnected: there is no longer work happening on the GPU timeline and the CPU data
    //     structures can be safely destroyed without additional synchronization.
    //   - Destroyed: the device is disconnected and resources have been reclaimed.
    enum class State {
        BeingCreated,
        Alive,
        BeingDisconnected,
        Disconnected,
        Destroyed,
    };
    State GetState() const;
    bool IsLost() const;
    void TrackObject(ApiObjectBase* object);
    std::mutex* GetObjectListMutex(ObjectType type);

    std::vector<const char*> GetTogglesUsed() const;
    WGSLExtensionSet GetWGSLExtensionAllowList() const;
    bool IsToggleEnabled(Toggle toggle) const;
    bool IsValidationEnabled() const;
    bool IsRobustnessEnabled() const;
    size_t GetLazyClearCountForTesting();
    void IncrementLazyClearCountForTesting();
    size_t GetDeprecationWarningCountForTesting();
    void EmitDeprecationWarning(const char* warning);
    void EmitLog(const char* message);
    void EmitLog(WGPULoggingType loggingType, const char* message);
    void APILoseForTesting();
    QueueBase* GetQueue() const;

    // AddFutureSerial is used to update the mFutureSerial with the max serial needed to be
    // ticked in order to clean up all pending callback work or to execute asynchronous resource
    // writes. It should be given the serial that a callback is tracked with, so that once that
    // serial is completed, it can be resolved and cleaned up. This is so that when there is no
    // gpu work (the last submitted serial has not moved beyond the completed serial), Tick can
    // still check if we have pending work to take care of, rather than hanging and never
    // reaching the serial the work will be executed on.
    void AddFutureSerial(ExecutionSerial serial);
    // Check for passed fences and set the new completed serial
    MaybeError CheckPassedSerials();

    MaybeError Tick();

    // TODO(crbug.com/dawn/839): Organize the below backend-specific parameters into the struct
    // BackendMetadata that we can query from the device.
    virtual uint32_t GetOptimalBytesPerRowAlignment() const = 0;
    virtual uint64_t GetOptimalBufferToTextureCopyOffsetAlignment() const = 0;

    virtual float GetTimestampPeriodInNS() const = 0;

    virtual bool ShouldDuplicateNumWorkgroupsForDispatchIndirect(
        ComputePipelineBase* computePipeline) const;

    virtual bool MayRequireDuplicationOfIndirectParameters() const;

    virtual bool ShouldDuplicateParametersForDrawIndirect(
        const RenderPipelineBase* renderPipelineBase) const;

    // TODO(crbug.com/dawn/1434): Make this function non-overridable when we support requesting
    // Adapter with toggles.
    virtual bool IsFeatureEnabled(Feature feature) const;

    const CombinedLimits& GetLimits() const;

    AsyncTaskManager* GetAsyncTaskManager() const;
    CallbackTaskManager* GetCallbackTaskManager() const;
    dawn::platform::WorkerTaskPool* GetWorkerTaskPool() const;

    void AddComputePipelineAsyncCallbackTask(Ref<ComputePipelineBase> pipeline,
                                             std::string errorMessage,
                                             WGPUCreateComputePipelineAsyncCallback callback,
                                             void* userdata);
    void AddRenderPipelineAsyncCallbackTask(Ref<RenderPipelineBase> pipeline,
                                            std::string errorMessage,
                                            WGPUCreateRenderPipelineAsyncCallback callback,
                                            void* userdata);

    PipelineCompatibilityToken GetNextPipelineCompatibilityToken();

    const CacheKey& GetCacheKey() const;
    const std::string& GetLabel() const;
    void APISetLabel(const char* label);
    void APIDestroy();

    virtual void AppendDebugLayerMessages(ErrorData* error) {}

  protected:
    // Constructor used only for mocking and testing.
    DeviceBase();

    void SetToggle(Toggle toggle, bool isEnabled);
    void ForceSetToggle(Toggle toggle, bool isEnabled);

    MaybeError Initialize(Ref<QueueBase> defaultQueue);
    void DestroyObjects();
    void Destroy();

    // Incrememt mLastSubmittedSerial when we submit the next serial
    void IncrementLastSubmittedCommandSerial();

  private:
    void WillDropLastExternalRef() override;

    virtual ResultOrError<Ref<BindGroupBase>> CreateBindGroupImpl(
        const BindGroupDescriptor* descriptor) = 0;
    virtual ResultOrError<Ref<BindGroupLayoutBase>> CreateBindGroupLayoutImpl(
        const BindGroupLayoutDescriptor* descriptor,
        PipelineCompatibilityToken pipelineCompatibilityToken) = 0;
    virtual ResultOrError<Ref<BufferBase>> CreateBufferImpl(const BufferDescriptor* descriptor) = 0;
    virtual ResultOrError<Ref<ExternalTextureBase>> CreateExternalTextureImpl(
        const ExternalTextureDescriptor* descriptor);
    virtual ResultOrError<Ref<PipelineLayoutBase>> CreatePipelineLayoutImpl(
        const PipelineLayoutDescriptor* descriptor) = 0;
    virtual ResultOrError<Ref<QuerySetBase>> CreateQuerySetImpl(
        const QuerySetDescriptor* descriptor) = 0;
    virtual ResultOrError<Ref<SamplerBase>> CreateSamplerImpl(
        const SamplerDescriptor* descriptor) = 0;
    virtual ResultOrError<Ref<ShaderModuleBase>> CreateShaderModuleImpl(
        const ShaderModuleDescriptor* descriptor,
        ShaderModuleParseResult* parseResult,
        OwnedCompilationMessages* compilationMessages) = 0;
    virtual ResultOrError<Ref<SwapChainBase>> CreateSwapChainImpl(
        const SwapChainDescriptor* descriptor) = 0;
    // Note that previousSwapChain may be nullptr, or come from a different backend.
    virtual ResultOrError<Ref<NewSwapChainBase>> CreateSwapChainImpl(
        Surface* surface,
        NewSwapChainBase* previousSwapChain,
        const SwapChainDescriptor* descriptor) = 0;
    virtual ResultOrError<Ref<TextureBase>> CreateTextureImpl(
        const TextureDescriptor* descriptor) = 0;
    virtual ResultOrError<Ref<TextureViewBase>> CreateTextureViewImpl(
        TextureBase* texture,
        const TextureViewDescriptor* descriptor) = 0;
    virtual Ref<ComputePipelineBase> CreateUninitializedComputePipelineImpl(
        const ComputePipelineDescriptor* descriptor) = 0;
    virtual Ref<RenderPipelineBase> CreateUninitializedRenderPipelineImpl(
        const RenderPipelineDescriptor* descriptor) = 0;
    virtual void SetLabelImpl();

    virtual MaybeError TickImpl() = 0;
    void FlushCallbackTaskQueue();

    ResultOrError<Ref<BindGroupLayoutBase>> CreateEmptyBindGroupLayout();

    Ref<ComputePipelineBase> GetCachedComputePipeline(
        ComputePipelineBase* uninitializedComputePipeline);
    Ref<RenderPipelineBase> GetCachedRenderPipeline(
        RenderPipelineBase* uninitializedRenderPipeline);
    Ref<ComputePipelineBase> AddOrGetCachedComputePipeline(
        Ref<ComputePipelineBase> computePipeline);
    Ref<RenderPipelineBase> AddOrGetCachedRenderPipeline(Ref<RenderPipelineBase> renderPipeline);
    virtual Ref<PipelineCacheBase> GetOrCreatePipelineCacheImpl(const CacheKey& key);
    virtual void InitializeComputePipelineAsyncImpl(Ref<ComputePipelineBase> computePipeline,
                                                    WGPUCreateComputePipelineAsyncCallback callback,
                                                    void* userdata);
    virtual void InitializeRenderPipelineAsyncImpl(Ref<RenderPipelineBase> renderPipeline,
                                                   WGPUCreateRenderPipelineAsyncCallback callback,
                                                   void* userdata);

    void ApplyToggleOverrides(const DawnTogglesDeviceDescriptor* togglesDescriptor);
    void ApplyFeatures(const DeviceDescriptor* deviceDescriptor);

    void SetDefaultToggles();

    void SetWGSLExtensionAllowList();

    void ConsumeError(std::unique_ptr<ErrorData> error);

    // Each backend should implement to check their passed fences if there are any and return a
    // completed serial. Return 0 should indicate no fences to check.
    virtual ResultOrError<ExecutionSerial> CheckAndUpdateCompletedSerials() = 0;
    // During shut down of device, some operations might have been started since the last submit
    // and waiting on a serial that doesn't have a corresponding fence enqueued. Fake serials to
    // make all commands look completed.
    void AssumeCommandsComplete();
    bool IsDeviceIdle();

    // mCompletedSerial tracks the last completed command serial that the fence has returned.
    // mLastSubmittedSerial tracks the last submitted command serial.
    // During device removal, the serials could be artificially incremented
    // to make it appear as if commands have been compeleted. They can also be artificially
    // incremented when no work is being done in the GPU so CPU operations don't have to wait on
    // stale serials.
    // mFutureSerial tracks the largest serial we need to tick to for asynchronous commands or
    // callbacks to fire
    ExecutionSerial mCompletedSerial = ExecutionSerial(0);
    ExecutionSerial mLastSubmittedSerial = ExecutionSerial(0);
    ExecutionSerial mFutureSerial = ExecutionSerial(0);

    // DestroyImpl is used to clean up and release resources used by device, does not wait for
    // GPU or check errors.
    virtual void DestroyImpl() = 0;

    // WaitForIdleForDestruction waits for GPU to finish, checks errors and gets ready for
    // destruction. This is only used when properly destructing the device. For a real
    // device loss, this function doesn't need to be called since the driver already closed all
    // resources.
    virtual MaybeError WaitForIdleForDestruction() = 0;

    wgpu::ErrorCallback mUncapturedErrorCallback = nullptr;
    void* mUncapturedErrorUserdata = nullptr;

    wgpu::LoggingCallback mLoggingCallback = nullptr;
    void* mLoggingUserdata = nullptr;

    wgpu::DeviceLostCallback mDeviceLostCallback = nullptr;
    void* mDeviceLostUserdata = nullptr;

    std::unique_ptr<ErrorScopeStack> mErrorScopeStack;

    // The Device keeps a ref to the Instance so that any live Device keeps the Instance alive.
    // The Instance shouldn't need to ref child objects so this shouldn't introduce ref cycles.
    // The Device keeps a simple pointer to the Adapter because the Adapter is owned by the
    // Instance.
    Ref<InstanceBase> mInstance;
    AdapterBase* mAdapter = nullptr;

    // The object caches aren't exposed in the header as they would require a lot of
    // additional includes.
    struct Caches;
    std::unique_ptr<Caches> mCaches;

    Ref<BindGroupLayoutBase> mEmptyBindGroupLayout;

    Ref<TextureViewBase> mExternalTexturePlaceholderView;

    std::unique_ptr<DynamicUploader> mDynamicUploader;
    std::unique_ptr<AsyncTaskManager> mAsyncTaskManager;
    Ref<QueueBase> mQueue;

    struct DeprecationWarnings;
    std::unique_ptr<DeprecationWarnings> mDeprecationWarnings;

    State mState = State::BeingCreated;

    // Encompasses the mutex and the actual list that contains all live objects "owned" by the
    // device.
    struct ApiObjectList {
        std::mutex mutex;
        LinkedList<ApiObjectBase> objects;
    };
    PerObjectType<ApiObjectList> mObjectLists;

    FormatTable mFormatTable;

    TogglesSet mEnabledToggles;
    TogglesSet mOverridenToggles;
    size_t mLazyClearCountForTesting = 0;
    std::atomic_uint64_t mNextPipelineCompatibilityToken;

    CombinedLimits mLimits;
    FeaturesSet mEnabledFeatures;
    WGSLExtensionSet mWGSLExtensionAllowList;

    std::unique_ptr<InternalPipelineStore> mInternalPipelineStore;

    std::unique_ptr<CallbackTaskManager> mCallbackTaskManager;
    std::unique_ptr<dawn::platform::WorkerTaskPool> mWorkerTaskPool;
    std::string mLabel;
    CacheKey mDeviceCacheKey;
};

}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_DEVICE_H_