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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include "IBackendInternal.hpp"
#include "DynamicBackend.hpp"
#include <armnn/Exceptions.hpp>
#include <string>
#include <dlfcn.h>
#include <vector>
#include <boost/format.hpp>
#if !defined(DYNAMIC_BACKEND_PATHS)
#define DYNAMIC_BACKEND_PATHS ""
#endif
namespace armnn
{
class DynamicBackendUtils
{
public:
static void* OpenHandle(const std::string& sharedObjectPath);
static void CloseHandle(const void* sharedObjectHandle);
template<typename EntryPointType>
static EntryPointType GetEntryPoint(const void* sharedObjectHandle, const char* symbolName);
static bool IsBackendCompatible(const BackendVersion& backendVersion);
static std::vector<std::string> GetBackendPaths(const std::string& overrideBackendPath = "");
static bool IsPathValid(const std::string& path);
static std::vector<std::string> GetSharedObjects(const std::vector<std::string>& backendPaths);
static std::vector<DynamicBackendPtr> CreateDynamicBackends(const std::vector<std::string>& sharedObjects);
static BackendIdSet RegisterDynamicBackends(const std::vector<DynamicBackendPtr>& dynamicBackends);
protected:
/// Protected methods for testing purposes
static bool IsBackendCompatibleImpl(const BackendVersion& backendApiVersion, const BackendVersion& backendVersion);
static std::vector<std::string> GetBackendPathsImpl(const std::string& backendPaths);
static BackendIdSet RegisterDynamicBackendsImpl(BackendRegistry& backendRegistry,
const std::vector<DynamicBackendPtr>& dynamicBackends);
private:
static std::string GetDlError();
/// This class is to hold utility functions only
DynamicBackendUtils() = delete;
};
template<typename EntryPointType>
EntryPointType DynamicBackendUtils::GetEntryPoint(const void* sharedObjectHandle, const char* symbolName)
{
if (sharedObjectHandle == nullptr)
{
throw RuntimeException("GetEntryPoint error: invalid handle");
}
if (symbolName == nullptr)
{
throw RuntimeException("GetEntryPoint error: invalid symbol");
}
auto entryPoint = reinterpret_cast<EntryPointType>(dlsym(const_cast<void*>(sharedObjectHandle), symbolName));
if (!entryPoint)
{
throw RuntimeException(boost::str(boost::format("GetEntryPoint error: %1%") % GetDlError()));
}
return entryPoint;
}
} // namespace armnn
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