blob: c234da03e3c53ed3dbb51bf31a7225e6c61a15be [file] [log] [blame]
// 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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "common/LinkedList.h"
#include "common/RefCounted.h"
#include "dawn_native/Forward.h"
#include <string>
namespace dawn_native {
class DeviceBase;
class ObjectBase : public RefCounted {
struct ErrorTag {};
static constexpr ErrorTag kError = {};
explicit ObjectBase(DeviceBase* device);
ObjectBase(DeviceBase* device, ErrorTag tag);
DeviceBase* GetDevice() const;
bool IsError() const;
// Pointer to owning device.
DeviceBase* mDevice;
class ApiObjectBase : public ObjectBase, public LinkNode<ApiObjectBase> {
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);
~ApiObjectBase() override;
virtual ObjectType GetType() const = 0;
const std::string& GetLabel() const;
// The ApiObjectBase is considered alive if it is tracked in a respective linked list owned
// by the owning device.
bool IsAlive() const;
// Allow virtual overriding of actual destroy call in order to allow for re-using of base
// destruction oerations. Classes that override this function should almost always call this
// class's implementation in the override. This needs to be public because it can be called
// from the device owning the object. Returns true iff destruction occurs. Upon any re-calls
// of the function it will return false to indicate no further operations should be taken.
virtual bool Destroy();
// Dawn API
void APISetLabel(const char* label);
// 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 TrackInDevice();
// Thread-safe manner to mark an object as destroyed. Returns true iff the call was the
// "winning" attempt to destroy the object. This is useful when sub-classes may have extra
// pre-destruction steps that need to occur only once, i.e. Buffer needs to be unmapped
// before being destroyed.
bool MarkDestroyed();
virtual void DestroyImpl();
virtual void SetLabelImpl();
std::string mLabel;
} // namespace dawn_native