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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "DynamicBackend.hpp"
#include "DynamicBackendUtils.hpp"
namespace armnn
{
DynamicBackend::DynamicBackend(const void* sharedObjectHandle)
: m_BackendIdFunction(nullptr)
, m_BackendVersionFunction(nullptr)
, m_BackendFactoryFunction(nullptr)
, m_Handle(const_cast<void*>(sharedObjectHandle), &DynamicBackendUtils::CloseHandle)
{
if (m_Handle == nullptr)
{
throw InvalidArgumentException("Cannot create a DynamicBackend object from an invalid shared object handle");
}
// These calls will throw in case of error
m_BackendIdFunction = SetFunctionPointer<IdFunctionType>("GetBackendId");
m_BackendVersionFunction = SetFunctionPointer<VersionFunctionType>("GetVersion");
m_BackendFactoryFunction = SetFunctionPointer<FactoryFunctionType>("BackendFactory");
// Check that the backend is compatible with the current Backend API
BackendId backendId = GetBackendId();
BackendVersion backendVersion = GetBackendVersion();
if (!DynamicBackendUtils::IsBackendCompatible(backendVersion))
{
throw RuntimeException(boost::str(boost::format("The dynamic backend %1% (version %2%) is not compatible"
"with the current Backend API (vesion %3%)")
% backendId
% backendVersion
% IBackendInternal::GetApiVersion()));
}
}
BackendId DynamicBackend::GetBackendId()
{
if (m_BackendIdFunction == nullptr)
{
throw RuntimeException("GetBackendId error: invalid function pointer");
}
const char* backendId = m_BackendIdFunction();
if (backendId == nullptr)
{
throw RuntimeException("GetBackendId error: invalid backend id");
}
return BackendId(backendId);
}
BackendVersion DynamicBackend::GetBackendVersion()
{
if (m_BackendVersionFunction == nullptr)
{
throw RuntimeException("GetBackendVersion error: invalid function pointer");
}
uint32_t major = 0;
uint32_t minor = 0;
m_BackendVersionFunction(&major, &minor);
return BackendVersion{ major, minor };
}
IBackendInternalUniquePtr DynamicBackend::GetBackend()
{
if (m_BackendFactoryFunction == nullptr)
{
throw RuntimeException("GetBackend error: invalid function pointer");
}
auto backendPointer = reinterpret_cast<IBackendInternal*>(m_BackendFactoryFunction());
if (backendPointer == nullptr)
{
throw RuntimeException("GetBackend error: backend instance must not be null");
}
return std::unique_ptr<IBackendInternal>(backendPointer);
}
template<typename BackendFunctionType>
BackendFunctionType DynamicBackend::SetFunctionPointer(const std::string& backendFunctionName)
{
if (m_Handle == nullptr)
{
throw RuntimeException("SetFunctionPointer error: invalid shared object handle");
}
if (backendFunctionName.empty())
{
throw RuntimeException("SetFunctionPointer error: backend function name must not be empty");
}
// This call will throw in case of error
auto functionPointer = DynamicBackendUtils::GetEntryPoint<BackendFunctionType>(m_Handle.get(),
backendFunctionName.c_str());
if (!functionPointer)
{
throw RuntimeException("SetFunctionPointer error: invalid backend function pointer returned");
}
return functionPointer;
}
} // namespace armnn
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