IVGCVSW-3596 Register the dynamic backends in the BackendRegistry

 * Added getter for the factory function in the DynamicBackend class
 * Added new RegisterDynamicBackends method in utils class
 * Added dynamic backend registration process in the Runtime class
 * Added new dummy dynamic backend objects for testing
 * Added unit tests for dynamic backend registration
 * Added convenience methods to BackendId

Change-Id: I01e147d1d6f01bf56747ad946f73f867af5770c4
Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>

1 files changed, 27 insertions, 7 deletions

diff --git a/src/backends/backendsCommon/DynamicBackend.cpp b/src/backends/backendsCommon/DynamicBackend.cpp
index 06d819b9a7..c576199e1f 100644
--- a/src/backends/backendsCommon/DynamicBackend.cpp
+++ b/src/backends/backendsCommon/DynamicBackend.cpp
@@ -70,18 +70,22 @@ BackendVersion DynamicBackend::GetBackendVersion()
 
 IBackendInternalUniquePtr DynamicBackend::GetBackend()
 {
+    // This call throws in case of error
+    return CreateBackend();
+}
+
+BackendRegistry::FactoryFunction DynamicBackend::GetFactoryFunction()
+{
     if (m_BackendFactoryFunction == nullptr)
     {
-        throw RuntimeException("GetBackend error: invalid function pointer");
+        throw RuntimeException("GetFactoryFunction error: invalid function pointer");
     }
 
-    auto backendPointer = reinterpret_cast<IBackendInternal*>(m_BackendFactoryFunction());
-    if (backendPointer == nullptr)
+    return [this]() -> IBackendInternalUniquePtr
     {
-        throw RuntimeException("GetBackend error: backend instance must not be null");
-    }
-
-    return std::unique_ptr<IBackendInternal>(backendPointer);
+        // This call throws in case of error
+        return CreateBackend();
+    };
 }
 
 template<typename BackendFunctionType>
@@ -108,4 +112,20 @@ BackendFunctionType DynamicBackend::SetFunctionPointer(const std::string& backen
     return functionPointer;
 }
 
+IBackendInternalUniquePtr DynamicBackend::CreateBackend()
+{
+    if (m_BackendFactoryFunction == nullptr)
+    {
+        throw RuntimeException("CreateBackend error: invalid function pointer");
+    }
+
+    auto backendPointer = reinterpret_cast<IBackendInternal*>(m_BackendFactoryFunction());
+    if (backendPointer == nullptr)
+    {
+        throw RuntimeException("CreateBackend error: backend instance must not be null");
+    }
+
+    return std::unique_ptr<IBackendInternal>(backendPointer);
+}
+
 } // namespace armnn