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/*
* Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "compiler/BackendManager.h"
#include <memory>
#include <dlfcn.h>
#include "backend/Backend.h"
#include "backend/controlflow/Backend.h"
#include "backend/controlflow/Config.h"
#include "backend/IConfig.h"
#include "util/logging.h"
#include "util/ConfigSource.h"
#include "misc/string_helpers.h"
static const char *SHARED_LIB_EXT =
#if defined(__APPLE__) && defined(__MACH__)
".dylib";
#else
".so";
#endif
namespace onert
{
namespace compiler
{
BackendManager &BackendManager::get()
{
static BackendManager object;
return object;
}
BackendManager::BackendManager() { loadControlflowBackend(); }
void BackendManager::loadControlflowBackend()
{
auto backend_object = std::unique_ptr<backend::controlflow::Backend, backend_destroy_t>(
new backend::controlflow::Backend, [](backend::Backend *backend) { delete backend; });
bool initialized = backend_object->config()->initialize(); // Call initialize here?
if (!initialized)
{
throw std::runtime_error(backend::controlflow::Config::ID + " backend initialization failed");
}
_controlflow = backend_object.get(); // Save the controlflow backend implementation pointer
assert(_controlflow);
_gen_map.emplace(backend_object->config()->id(), std::move(backend_object));
}
void BackendManager::loadBackend(const std::string &backend)
{
if (get(backend) != nullptr)
{
return;
}
// TODO Remove indentation
// Workaround If backend have dynamic library with "-boost" suffix naming,
// BackendManager load library with "-boost" suffix instead of library without suffix
// This feature is used for custom backend extension to support additional operations
{
const std::string backend_boost_so = "libbackend_" + backend + "-boost" + SHARED_LIB_EXT;
const std::string backend_so = "libbackend_" + backend + SHARED_LIB_EXT;
void *handle = dlopen(backend_boost_so.c_str(), RTLD_LAZY | RTLD_LOCAL);
if (handle == nullptr)
{
handle = dlopen(backend_so.c_str(), RTLD_LAZY | RTLD_LOCAL);
if (handle == nullptr)
{
VERBOSE_F() << "Failed to load backend '" << backend << "' - " << dlerror() << std::endl;
return;
}
VERBOSE_F() << "Successfully loaded '" << backend << "' - " << backend_so << "\n";
}
else
{
VERBOSE_F() << "Successfully loaded '" << backend << "' - " << backend_boost_so << "\n";
}
{
// load object creator function
auto backend_create = (backend_create_t)dlsym(handle, "onert_backend_create");
if (backend_create == nullptr)
{
fprintf(stderr, "BackendManager: unable to open function onert_backend_create : %s\n",
dlerror());
abort();
}
// load object creator function
auto backend_destroy = (backend_destroy_t)dlsym(handle, "onert_backend_destroy");
if (backend_destroy == nullptr)
{
fprintf(stderr, "BackendManager: unable to open function onert_backend_destroy : %s\n",
dlerror());
abort();
}
auto backend_object =
std::unique_ptr<backend::Backend, backend_destroy_t>(backend_create(), backend_destroy);
bool initialized = backend_object->config()->initialize(); // Call initialize here?
if (!initialized)
{
VERBOSE_F() << backend.c_str() << " backend initialization failed. Don't use this backend"
<< std::endl;
dlclose(handle);
return;
}
_gen_map.emplace(backend_object->config()->id(), std::move(backend_object));
}
// Save backend handle (avoid warning by handle lost without dlclose())
auto u_handle = std::unique_ptr<void, dlhandle_destroy_t>{handle, [](void *h) { dlclose(h); }};
_handle_map.emplace(backend, std::move(u_handle));
}
}
backend::Backend *BackendManager::get(const std::string &key)
{
if (_gen_map.find(key) != _gen_map.end())
{
return _gen_map.at(key).get();
}
return nullptr;
}
const backend::Backend *BackendManager::get(const std::string &key) const
{
if (_gen_map.find(key) != _gen_map.end())
{
return _gen_map.at(key).get();
}
return nullptr;
}
const backend::controlflow::Backend *BackendManager::getControlflow() const { return _controlflow; }
} // namespace compiler
} // namespace onert
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