| // Copyright 2018 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_OBJECTBASE_H_ |
| #define SRC_DAWN_NATIVE_OBJECTBASE_H_ |
| |
| #include <mutex> |
| #include <string> |
| |
| #include "dawn/common/LinkedList.h" |
| #include "dawn/common/Ref.h" |
| #include "dawn/common/RefCounted.h" |
| #include "dawn/native/Forward.h" |
| |
| namespace absl { |
| class FormatSink; |
| } |
| |
| namespace dawn::native { |
| |
| class ApiObjectBase; |
| class DeviceBase; |
| |
| class ErrorMonad : public RefCounted { |
| public: |
| struct ErrorTag {}; |
| static constexpr ErrorTag kError = {}; |
| |
| ErrorMonad(); |
| explicit ErrorMonad(ErrorTag tag); |
| |
| bool IsError() const; |
| }; |
| |
| class ObjectBase : public ErrorMonad { |
| public: |
| explicit ObjectBase(DeviceBase* device); |
| ObjectBase(DeviceBase* device, ErrorTag tag); |
| |
| DeviceBase* GetDevice() const; |
| |
| private: |
| // Ref to owning device. |
| Ref<DeviceBase> mDevice; |
| }; |
| |
| // Generic object list with a mutex for tracking for destruction. |
| class ApiObjectList { |
| public: |
| // Tracks an object if the list is not destroyed. If the list is destroyed, destroys the object. |
| void Track(ApiObjectBase* object); |
| |
| // Returns true iff the object was removed from the list. |
| bool Untrack(ApiObjectBase* object); |
| |
| // Destroys and removes all the objects tracked in the list. |
| void Destroy(); |
| |
| private: |
| // Boolean used to mark the list so that on subsequent calls to Untrack, we don't need to |
| // reaquire the lock, and Track on new objects immediately destroys them. |
| bool mMarkedDestroyed = false; |
| std::mutex mMutex; |
| LinkedList<ApiObjectBase> mObjects; |
| }; |
| |
| class ApiObjectBase : public ObjectBase, public LinkNode<ApiObjectBase> { |
| public: |
| struct LabelNotImplementedTag {}; |
| static constexpr LabelNotImplementedTag kLabelNotImplemented = {}; |
| struct UntrackedByDeviceTag {}; |
| static constexpr UntrackedByDeviceTag kUntrackedByDevice = {}; |
| |
| ApiObjectBase(DeviceBase* device, LabelNotImplementedTag tag); |
| ApiObjectBase(DeviceBase* device, const char* label); |
| ApiObjectBase(DeviceBase* device, ErrorTag tag, const char* label = nullptr); |
| ~ApiObjectBase() override; |
| |
| virtual ObjectType GetType() const = 0; |
| void SetLabel(std::string label); |
| const std::string& GetLabel() const; |
| |
| virtual void FormatLabel(absl::FormatSink* s) const; |
| |
| // The ApiObjectBase is considered alive if it is tracked in a respective linked list owned |
| // by the owning device. |
| bool IsAlive() const; |
| |
| // This needs to be public because it can be called from the device owning the object. |
| void Destroy(); |
| |
| // Dawn API |
| void APISetLabel(const char* label); |
| |
| protected: |
| // Overriding of the RefCounted's DeleteThis function ensures that instances of objects |
| // always call their derived class implementation of Destroy prior to the derived |
| // class being destroyed. This guarantees that when ApiObjects' reference counts drop to 0, |
| // then the underlying backend's Destroy calls are executed. We cannot naively put the call |
| // to Destroy in the destructor of this class because it calls DestroyImpl |
| // which is a virtual function often implemented in the Derived class which would already |
| // have been destroyed by the time ApiObject's destructor is called by C++'s destruction |
| // order. Note that some classes like BindGroup may override the DeleteThis function again, |
| // and they should ensure that their overriding versions call this underlying version |
| // somewhere. |
| void DeleteThis() override; |
| void LockAndDeleteThis() override; |
| |
| // Returns the list where this object may be tracked for future destruction. This can be |
| // overrided to create hierarchical object tracking ownership: |
| // i.e. Device -[tracks]-> Texture -[tracks]-> TextureView. |
| virtual ApiObjectList* GetObjectTrackingList(); |
| |
| // Sub-classes may override this function multiple times. Whenever overriding this function, |
| // however, users should be sure to call their parent's version in the new override to make |
| // sure that all destroy functionality is kept. This function is guaranteed to only be |
| // called once through the exposed Destroy function. |
| virtual void DestroyImpl() = 0; |
| |
| private: |
| friend class ApiObjectList; |
| |
| virtual void SetLabelImpl(); |
| |
| std::string mLabel; |
| }; |
| |
| } // namespace dawn::native |
| |
| #endif // SRC_DAWN_NATIVE_OBJECTBASE_H_ |