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#ifndef DataFormats_Portable_interface_PortableDeviceObject_h
#define DataFormats_Portable_interface_PortableDeviceObject_h
#include <cassert>
#include <optional>
#include <type_traits>
#include <alpaka/alpaka.hpp>
#include "DataFormats/Common/interface/Uninitialized.h"
#include "HeterogeneousCore/AlpakaInterface/interface/config.h"
#include "HeterogeneousCore/AlpakaInterface/interface/memory.h"
// generic object in device memory
template <typename T, typename TDev, typename = std::enable_if_t<alpaka::isDevice<TDev>>>
class PortableDeviceObject {
static_assert(not std::is_same_v<TDev, alpaka_common::DevHost>,
"Use PortableHostObject<T> instead of PortableDeviceObject<T, DevHost>");
public:
using Product = T;
using Buffer = cms::alpakatools::device_buffer<TDev, Product>;
using ConstBuffer = cms::alpakatools::const_device_buffer<TDev, Product>;
PortableDeviceObject() = delete;
PortableDeviceObject(edm::Uninitialized) {}
PortableDeviceObject(TDev const& device)
// allocate global device memory
: buffer_{cms::alpakatools::make_device_buffer<Product>(device)} {
assert(reinterpret_cast<uintptr_t>(buffer_->data()) % alignof(Product) == 0);
}
template <typename TQueue, typename = std::enable_if_t<alpaka::isQueue<TQueue>>>
PortableDeviceObject(TQueue const& queue)
// allocate global device memory with queue-ordered semantic
: buffer_{cms::alpakatools::make_device_buffer<Product>(queue)} {
assert(reinterpret_cast<uintptr_t>(buffer_->data()) % alignof(Product) == 0);
}
// non-copyable
PortableDeviceObject(PortableDeviceObject const&) = delete;
PortableDeviceObject& operator=(PortableDeviceObject const&) = delete;
// movable
PortableDeviceObject(PortableDeviceObject&&) = default;
PortableDeviceObject& operator=(PortableDeviceObject&&) = default;
// default destructor
~PortableDeviceObject() = default;
// access the product
Product& value() { return *buffer_->data(); }
Product const& value() const { return *buffer_->data(); }
Product const& const_value() const { return *buffer_->data(); }
Product* data() { return buffer_->data(); }
Product const* data() const { return buffer_->data(); }
Product const* const_data() const { return buffer_->data(); }
Product& operator*() { return *buffer_->data(); }
Product const& operator*() const { return *buffer_->data(); }
Product* operator->() { return buffer_->data(); }
Product const* operator->() const { return buffer_->data(); }
// access the buffer
Buffer buffer() { return *buffer_; }
ConstBuffer buffer() const { return *buffer_; }
ConstBuffer const_buffer() const { return *buffer_; }
// erases the data in the Buffer by writing zeros (bytes containing '\0') to it
template <typename TQueue, typename = std::enable_if_t<alpaka::isQueue<TQueue>>>
void zeroInitialise(TQueue&& queue) {
alpaka::memset(std::forward<TQueue>(queue), *buffer_, 0x00);
}
private:
std::optional<Buffer> buffer_;
};
#endif // DataFormats_Portable_interface_PortableDeviceObject_h
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