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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include "CpuTensorHandleFwd.hpp"
#include <armnn/TypesUtils.hpp>
#include <backendsCommon/OutputHandler.hpp>
#include <algorithm>
namespace armnn
{
// Abstract tensor handles wrapping a CPU-readable region of memory, interpreting it as tensor data.
class ConstCpuTensorHandle : public ITensorHandle
{
public:
template <typename T>
const T* GetConstTensor() const
{
BOOST_ASSERT(GetTensorInfo().GetDataType() == GetDataType<T>());
return reinterpret_cast<const T*>(m_Memory);
}
const TensorInfo& GetTensorInfo() const
{
return m_TensorInfo;
}
virtual void Manage() override {}
virtual ITensorHandle* GetParent() const override { return nullptr; }
virtual const void* Map(bool /* blocking = true */) const override { return m_Memory; }
virtual void Unmap() const override {}
TensorShape GetStrides() const override
{
TensorShape shape(m_TensorInfo.GetShape());
auto size = GetDataTypeSize(m_TensorInfo.GetDataType());
auto runningSize = size;
std::vector<unsigned int> strides(shape.GetNumDimensions());
auto lastIdx = shape.GetNumDimensions()-1;
for (unsigned int i=0; i < lastIdx ; i++)
{
strides[lastIdx-i] = runningSize;
runningSize *= shape[lastIdx-i];
}
strides[0] = runningSize;
return TensorShape(shape.GetNumDimensions(), strides.data());
}
TensorShape GetShape() const override { return m_TensorInfo.GetShape(); }
protected:
ConstCpuTensorHandle(const TensorInfo& tensorInfo);
void SetConstMemory(const void* mem) { m_Memory = mem; }
private:
// Only used for testing
void CopyOutTo(void *) const override {}
void CopyInFrom(const void*) override {}
ConstCpuTensorHandle(const ConstCpuTensorHandle& other) = delete;
ConstCpuTensorHandle& operator=(const ConstCpuTensorHandle& other) = delete;
TensorInfo m_TensorInfo;
const void* m_Memory;
};
// Abstract specialization of ConstCpuTensorHandle that allows write access to the same data.
class CpuTensorHandle : public ConstCpuTensorHandle
{
public:
template <typename T>
T* GetTensor() const
{
BOOST_ASSERT(GetTensorInfo().GetDataType() == GetDataType<T>());
return reinterpret_cast<T*>(m_MutableMemory);
}
protected:
CpuTensorHandle(const TensorInfo& tensorInfo);
void SetMemory(void* mem)
{
m_MutableMemory = mem;
SetConstMemory(m_MutableMemory);
}
private:
CpuTensorHandle(const CpuTensorHandle& other) = delete;
CpuTensorHandle& operator=(const CpuTensorHandle& other) = delete;
void* m_MutableMemory;
};
// A CpuTensorHandle that owns the wrapped memory region.
class ScopedCpuTensorHandle : public CpuTensorHandle
{
public:
explicit ScopedCpuTensorHandle(const TensorInfo& tensorInfo);
// Copies contents from Tensor.
explicit ScopedCpuTensorHandle(const ConstTensor& tensor);
// Copies contents from ConstCpuTensorHandle
explicit ScopedCpuTensorHandle(const ConstCpuTensorHandle& tensorHandle);
ScopedCpuTensorHandle(const ScopedCpuTensorHandle& other);
ScopedCpuTensorHandle& operator=(const ScopedCpuTensorHandle& other);
~ScopedCpuTensorHandle();
virtual void Allocate() override;
private:
// Only used for testing
void CopyOutTo(void* memory) const override;
void CopyInFrom(const void* memory) override;
void CopyFrom(const ScopedCpuTensorHandle& other);
void CopyFrom(const void* srcMemory, unsigned int numBytes);
};
// A CpuTensorHandle that wraps an already allocated memory region.
//
// Clients must make sure the passed in memory region stays alive for the lifetime of
// the PassthroughCpuTensorHandle instance.
//
// Note there is no polymorphism to/from ConstPassthroughCpuTensorHandle.
class PassthroughCpuTensorHandle : public CpuTensorHandle
{
public:
PassthroughCpuTensorHandle(const TensorInfo& tensorInfo, void* mem)
: CpuTensorHandle(tensorInfo)
{
SetMemory(mem);
}
virtual void Allocate() override;
};
// A ConstCpuTensorHandle that wraps an already allocated memory region.
//
// This allows users to pass in const memory to a network.
// Clients must make sure the passed in memory region stays alive for the lifetime of
// the PassthroughCpuTensorHandle instance.
//
// Note there is no polymorphism to/from PassthroughCpuTensorHandle.
class ConstPassthroughCpuTensorHandle : public ConstCpuTensorHandle
{
public:
ConstPassthroughCpuTensorHandle(const TensorInfo& tensorInfo, const void* mem)
: ConstCpuTensorHandle(tensorInfo)
{
SetConstMemory(mem);
}
virtual void Allocate() override;
};
// Template specializations.
template <>
const void* ConstCpuTensorHandle::GetConstTensor() const;
template <>
void* CpuTensorHandle::GetTensor() const;
} // namespace armnn
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