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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "DynamicBackendUtils.hpp"
#include <boost/filesystem.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/log/trivial.hpp>
#include <regex>
namespace armnn
{
void* DynamicBackendUtils::OpenHandle(const std::string& sharedObjectPath)
{
if (sharedObjectPath.empty())
{
throw RuntimeException("OpenHandle error: shared object path must not be empty");
}
void* sharedObjectHandle = dlopen(sharedObjectPath.c_str(), RTLD_LAZY | RTLD_GLOBAL);
if (!sharedObjectHandle)
{
throw RuntimeException(boost::str(boost::format("OpenHandle error: %1%") % GetDlError()));
}
return sharedObjectHandle;
}
void DynamicBackendUtils::CloseHandle(const void* sharedObjectHandle)
{
if (!sharedObjectHandle)
{
return;
}
dlclose(const_cast<void*>(sharedObjectHandle));
}
bool DynamicBackendUtils::IsBackendCompatible(const BackendVersion &backendVersion)
{
BackendVersion backendApiVersion = IBackendInternal::GetApiVersion();
return IsBackendCompatibleImpl(backendApiVersion, backendVersion);
}
bool DynamicBackendUtils::IsBackendCompatibleImpl(const BackendVersion &backendApiVersion,
const BackendVersion &backendVersion)
{
return backendVersion.m_Major == backendApiVersion.m_Major &&
backendVersion.m_Minor <= backendApiVersion.m_Minor;
}
std::string DynamicBackendUtils::GetDlError()
{
const char* errorMessage = dlerror();
if (!errorMessage)
{
return "";
}
return std::string(errorMessage);
}
std::vector<std::string> DynamicBackendUtils::GetBackendPaths(const std::string& overrideBackendPath)
{
// Check if a path where to dynamically load the backends from is given
if (!overrideBackendPath.empty())
{
if (!IsPathValid(overrideBackendPath))
{
BOOST_LOG_TRIVIAL(warning) << "WARNING: The given override path for dynamic backends \""
<< overrideBackendPath << "\" is not valid";
return {};
}
return std::vector<std::string>{ overrideBackendPath };
}
// Expects a colon-separated list: DYNAMIC_BACKEND_PATHS="PATH_1:PATH_2:...:PATH_N"
const std::string backendPaths = DYNAMIC_BACKEND_PATHS;
return GetBackendPathsImpl(backendPaths);
}
std::vector<std::string> DynamicBackendUtils::GetBackendPathsImpl(const std::string& backendPaths)
{
std::unordered_set<std::string> uniqueBackendPaths;
std::vector<std::string> tempBackendPaths;
std::vector<std::string> validBackendPaths;
// Split the given list of paths
boost::split(tempBackendPaths, backendPaths, boost::is_any_of(":"));
for (const std::string& path : tempBackendPaths)
{
// Check whether the path is valid
if (!IsPathValid(path))
{
continue;
}
// Check whether the path is a duplicate
auto it = uniqueBackendPaths.find(path);
if (it != uniqueBackendPaths.end())
{
// The path is a duplicate
continue;
}
// Add the path to the set of unique paths
uniqueBackendPaths.insert(path);
// Add the path to the list of valid paths
validBackendPaths.push_back(path);
}
return validBackendPaths;
}
bool DynamicBackendUtils::IsPathValid(const std::string& path)
{
if (path.empty())
{
BOOST_LOG_TRIVIAL(warning) << "WARNING: The given backend path is empty";
return false;
}
boost::filesystem::path boostPath(path);
if (!boost::filesystem::exists(boostPath))
{
BOOST_LOG_TRIVIAL(warning) << "WARNING: The given backend path \"" << path << "\" does not exist";
return false;
}
if (!boost::filesystem::is_directory(boostPath))
{
BOOST_LOG_TRIVIAL(warning) << "WARNING: The given backend path \"" << path << "\" is not a directory";
return false;
}
if (!boostPath.is_absolute())
{
BOOST_LOG_TRIVIAL(warning) << "WARNING: The given backend path \"" << path << "\" is not absolute";
return false;
}
return true;
}
std::vector<std::string> DynamicBackendUtils::GetSharedObjects(const std::vector<std::string>& backendPaths)
{
std::unordered_set<std::string> uniqueSharedObjects;
std::vector<std::string> sharedObjects;
for (const std::string& backendPath : backendPaths)
{
using namespace boost::filesystem;
// Check if the path is valid. In case of error, IsValidPath will log an error message
if (!IsPathValid(backendPath))
{
continue;
}
// Go through all the files in the current backend path
for (directory_iterator fileIterator(backendPath); fileIterator != directory_iterator(); fileIterator++)
{
path filePath = *fileIterator;
std::string filename = filePath.filename().string();
if (filename.empty())
{
// Empty filename
continue;
}
path canonicalPath;
try
{
// Get the canonical path for the current file, it will throw if for example the file is a
// symlink that cannot be resolved
canonicalPath = canonical(filePath);
}
catch (const filesystem_error& e)
{
BOOST_LOG_TRIVIAL(warning) << "GetSharedObjects warning: " << e.what();
}
if (canonicalPath.empty())
{
// No such file or perhaps a symlink that couldn't be resolved
continue;
}
// Check if the current filename matches the expected naming convention
// The expected format is: <vendor>_<name>_backend.so[<version>]
// e.g. "Arm_GpuAcc_backend.so" or "Arm_GpuAcc_backend.so.1.2"
const std::regex dynamicBackendRegex("^[a-zA-Z0-9]+_[a-zA-Z0-9]+_backend.so(\\.[0-9]+)*$");
bool filenameMatch = false;
try
{
// Match the filename to the expected naming scheme
filenameMatch = std::regex_match(filename, dynamicBackendRegex);
}
catch (const std::exception& e)
{
BOOST_LOG_TRIVIAL(warning) << "GetSharedObjects warning: " << e.what();
}
if (!filenameMatch)
{
// Filename does not match the expected naming scheme (or an error has occurred)
continue;
}
// Append the valid canonical path to the output list only if it's not a duplicate
std::string validCanonicalPath = canonicalPath.string();
auto it = uniqueSharedObjects.find(validCanonicalPath);
if (it == uniqueSharedObjects.end())
{
// Not a duplicate, append the canonical path to the output list
sharedObjects.push_back(validCanonicalPath);
// Add the canonical path to the collection of unique shared objects
uniqueSharedObjects.insert(validCanonicalPath);
}
}
}
return sharedObjects;
}
} // namespace armnn
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