1 files changed, 81 insertions, 0 deletions
diff --git a/src/backends/tosaCommon/TosaMappings.hpp b/src/backends/tosaCommon/TosaMappings.hpp
new file mode 100644
index 0000000000..5728ff3203
--- /dev/null
+++ b/src/backends/tosaCommon/TosaMappings.hpp
@@ -0,0 +1,81 @@
+//
+// Copyright © 2022 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <Layer.hpp>
+
+#include <tosa_serialization_handler.h>
+#include "operatorMappings/AdditionOperator.hpp"
+
+using namespace armnn;
+using namespace tosa;
+
+// From the input armnn::Layer, set the corresponding data field in the
+// tosa::TosaSerializationTensor where constant tensor data exists in the armnn::Layer.
+void SetBasicBlockConstantTensorData(Layer* layer, TosaSerializationBasicBlock* /*basicBlock*/)
+{
+    switch (layer->GetType())
+    {
+        case LayerType::Convolution2d:
+        {
+            // ToDo: using Convolution2d as an example as it has constant tensors for weights and bias.
+            // ToDo: manually set TosaOperator data of basicBlock where constant tensors exist.
+        }
+        default:
+            // If no switch statement for layer, no constant tensors exist in that layer, return
+            return;
+    }
+}
+
+// Populates a tosa::TosaSerializationBasicBlock from constructing
+// tosa::TosaSerializationOperator(s) and tosa::TosaSerializationTensor(s)
+// based on the input armnn::LayerType and associated armnn::TensorInfos and armnn::Descriptor.
+//
+// If an armnn::LayerType does not have a tosa mapping or the mapping is not implemented in ArmNN,
+// an empty tosa::TosaSerializationBasicBlock() is returned with operator tosa::Op_UNKNOWN.
+TosaSerializationBasicBlock* GetTosaMapping(const LayerType type,
+                                            const std::vector<const TensorInfo*>& inputs,
+                                            const std::vector<const TensorInfo*>& outputs,
+                                            const BaseDescriptor& /*descriptor*/)
+{
+    switch (type)
+    {
+        case LayerType::Addition:
+        {
+            return ConvertAdditionToTosaOperator(inputs, outputs);
+        }
+        default:
+        {
+            // empty basic block when no tosa mapping implemented/exists
+            TosaSerializationOperator* op = new TosaSerializationOperator(Op_UNKNOWN, Attribute_NONE, nullptr, {}, {});
+            return new TosaSerializationBasicBlock("", {op}, {}, {}, {});
+        }
+    }
+}
+
+// Function called in armnn::OptimizeSubgraphView() when access to armnn::Layer is available
+// and there is an option to set tosa basic block data from constant layer tenors available from the input layer.
+TosaSerializationBasicBlock* GetTosaMappingFromLayer(Layer* layer)
+{
+    std::vector<const TensorInfo*> inputs;
+    for (auto inputSlot : layer->GetInputSlots())
+    {
+        inputs.push_back(&inputSlot.GetConnection()->GetTensorInfo());
+    }
+
+    std::vector<const TensorInfo*> outputs;
+    for (auto& outputSlot : layer->GetOutputSlots())
+    {
+        outputs.push_back(&outputSlot.GetTensorInfo());
+    }
+
+    TosaSerializationBasicBlock* basicBlock = GetTosaMapping(layer->GetType(),
+                                                             inputs,
+                                                             outputs,
+                                                             layer->GetParameters());
+    SetBasicBlockConstantTensorData(layer, basicBlock);
+    return basicBlock;
+}