1 files changed, 85 insertions, 3 deletions

diff --git a/src/backends/reference/RefTensorHandle.hpp b/src/backends/reference/RefTensorHandle.hpp
index b4dedd5e77..128f623cd3 100644
--- a/src/backends/reference/RefTensorHandle.hpp
+++ b/src/backends/reference/RefTensorHandle.hpp
@@ -1,7 +1,8 @@
 //
-// Copyright © 2017 Arm Ltd. All rights reserved.
+// Copyright © 2019-2023 Arm Ltd. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
+
 #pragma once
 
 #include <armnn/backends/TensorHandle.hpp>
@@ -11,14 +12,17 @@
 namespace armnn
 {
 
+class RefTensorHandleDecorator;
 // An implementation of ITensorHandle with simple "bump the pointer" memory-management behaviour
 class RefTensorHandle : public ITensorHandle
 {
 public:
-    RefTensorHandle(const TensorInfo& tensorInfo, std::shared_ptr<RefMemoryManager> &memoryManager);
+    RefTensorHandle(const TensorInfo& tensorInfo, std::shared_ptr<RefMemoryManager>& memoryManager);
 
     RefTensorHandle(const TensorInfo& tensorInfo);
 
+    RefTensorHandle(const TensorInfo& tensorInfo, const RefTensorHandle& parent);
+
     ~RefTensorHandle();
 
     virtual void Manage() override;
@@ -56,6 +60,8 @@ public:
     virtual bool Import(void* memory, MemorySource source) override;
     virtual bool CanBeImported(void* memory, MemorySource source) override;
 
+    virtual std::shared_ptr<ITensorHandle> DecorateTensorHandle(const TensorInfo& tensorInfo) override;
+
 private:
     // Only used for testing
     void CopyOutTo(void*) const override;
@@ -68,10 +74,86 @@ private:
 
     TensorInfo m_TensorInfo;
 
-    std::shared_ptr<RefMemoryManager> m_MemoryManager;
+    mutable std::shared_ptr<RefMemoryManager> m_MemoryManager;
     RefMemoryManager::Pool* m_Pool;
     mutable void* m_UnmanagedMemory;
     void* m_ImportedMemory;
+    std::vector<std::shared_ptr<RefTensorHandleDecorator>> m_Decorated;
+};
+
+class RefTensorHandleDecorator : public RefTensorHandle
+{
+public:
+    RefTensorHandleDecorator(const TensorInfo& tensorInfo, const RefTensorHandle& parent);
+
+    ~RefTensorHandleDecorator() = default;
+
+    virtual void Manage() override;
+
+    virtual void Allocate() override;
+
+    virtual ITensorHandle* GetParent() const override
+    {
+        return nullptr;
+    }
+
+    virtual const void* Map(bool /* blocking = true */) const override;
+    using ITensorHandle::Map;
+
+    virtual void Unmap() const override
+    {}
+
+    TensorShape GetStrides() const override
+    {
+        return GetUnpaddedTensorStrides(m_TensorInfo);
+    }
+
+    TensorShape GetShape() const override
+    {
+        return m_TensorInfo.GetShape();
+    }
+
+    const TensorInfo& GetTensorInfo() const
+    {
+        return m_TensorInfo;
+    }
+
+    virtual MemorySourceFlags GetImportFlags() const override;
+
+    virtual bool Import(void* memory, MemorySource source) override;
+    virtual bool CanBeImported(void* memory, MemorySource source) override;
+
+    virtual std::shared_ptr<ITensorHandle> DecorateTensorHandle(const TensorInfo& tensorInfo) override;
+
+    /// Map the tensor data for access. Must be paired with call to Unmap().
+    /// \param blocking hint to block the calling thread until all other accesses are complete. (backend dependent)
+    /// \return pointer to the first element of the mapped data.
+    void* Map(bool blocking=true)
+    {
+        return const_cast<void*>(static_cast<const ITensorHandle*>(this)->Map(blocking));
+    }
+
+    /// Unmap the tensor data that was previously mapped with call to Map().
+    void Unmap()
+    {
+        return static_cast<const ITensorHandle*>(this)->Unmap();
+    }
+
+    /// Testing support to be able to verify and set tensor data content
+    void CopyOutTo(void* /* memory */) const override
+    {};
+
+    void CopyInFrom(const void* /* memory */) override
+    {};
+
+    /// Unimport externally allocated memory
+    void Unimport() override
+    {};
+
+private:
+    TensorInfo m_TensorInfo;
+    const RefTensorHandle& m_Parent;
 };
 
 }
+