IVGCVSW-5483 'Implement Loading and Saving to File'

 * Implemented Serialization and Deserialization of CLContext.
 * Fixed flatbuffers android-nn-driver dependency.

!android-nn-driver:4772

Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: If806f050535ffaa70922ba0f1ffe7bb10f902329

1 files changed, 57 insertions, 0 deletions

diff --git a/src/backends/cl/ClContextSerializer.cpp b/src/backends/cl/ClContextSerializer.cpp
new file mode 100644
index 0000000000..db89203a25
--- /dev/null
+++ b/src/backends/cl/ClContextSerializer.cpp
@@ -0,0 +1,57 @@
+//
+// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "ClContextSerializer.hpp"
+#include "ClContextSchema_generated.h"
+
+#include <armnn/Exceptions.hpp>
+#include <armnn/Logging.hpp>
+#include <armnn/utility/NumericCast.hpp>
+
+#include <fmt/format.h>
+
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+namespace armnn
+{
+
+void ClContextSerializer::Serialize(const arm_compute::CLCompileContext& clCompileContext)
+{
+    // Get map of built programs from clCompileContext
+    std::map<std::string, cl::Program> builtProgramsMap = clCompileContext.get_built_programs();
+    if (builtProgramsMap.empty())
+    {
+        ARMNN_LOG(warning) << "There are no built programs to be serialised.";
+        return;
+    }
+
+    // Create Flatbuffer CL Programs
+    std::vector<flatbuffers::Offset<armnn::Program>> clPrograms;
+    for(const auto& program : builtProgramsMap)
+    {
+        std::vector<std::vector<uint8_t>> binaries = program.second.getInfo<CL_PROGRAM_BINARIES>();
+        clPrograms.push_back(CreateProgram(m_FlatBufferBuilder,
+                                           m_FlatBufferBuilder.CreateString(program.first),
+                                           m_FlatBufferBuilder.CreateVector(binaries[0])));
+    }
+
+    // Create Flatbuffer CLContext
+    auto clContext = CreateClContext(m_FlatBufferBuilder, m_FlatBufferBuilder.CreateVector(clPrograms));
+
+    m_FlatBufferBuilder.Finish(clContext);
+}
+
+bool ClContextSerializer::SaveSerializedToStream(std::ostream& stream)
+{
+    // Write to a stream
+    auto bytesToWrite = armnn::numeric_cast<std::streamsize>(m_FlatBufferBuilder.GetSize());
+    stream.write(reinterpret_cast<const char*>(m_FlatBufferBuilder.GetBufferPointer()), bytesToWrite);
+    return !stream.bad();
+}
+
+} // namespace armnn