compute-runtime/shared/source/compiler_interface/linux/os_compiler_cache_helper.cpp

/*
 * Copyright (C) 2023 Intel Corporation
 *
 * SPDX-License-Identifier: MIT
 *
 */

#include "shared/source/compiler_interface/os_compiler_cache_helper.h"

#include "shared/source/os_interface/linux/sys_calls.h"
#include "shared/source/utilities/debug_settings_reader.h"
#include "shared/source/utilities/io_functions.h"

#include "os_inc.h"

#include <dlfcn.h>
#include <link.h>

namespace NEO {
std::string makePath(const std::string &lhs, const std::string &rhs) {
    if (lhs.size() == 0) {
        return rhs;
    }

    if (rhs.size() == 0) {
        return lhs;
    }

    if (*lhs.rbegin() == PATH_SEPARATOR) {
        return lhs + rhs;
    }

    return lhs + PATH_SEPARATOR + rhs;
}

bool createCompilerCachePath(std::string &cacheDir) {
    if (NEO::SysCalls::pathExists(cacheDir)) {
        if (NEO::SysCalls::pathExists(makePath(cacheDir, "neo_compiler_cache"))) {
            cacheDir = makePath(cacheDir, "neo_compiler_cache");
            return true;
        }

        if (NEO::SysCalls::mkdir(makePath(cacheDir, "neo_compiler_cache")) == 0) {
            cacheDir = makePath(cacheDir, "neo_compiler_cache");
            return true;
        } else {
            if (errno == EEXIST) {
                cacheDir = makePath(cacheDir, "neo_compiler_cache");
                return true;
            }
        }
    }

    cacheDir = "";
    return false;
}

bool checkDefaultCacheDirSettings(std::string &cacheDir, SettingsReader *reader) {
    std::string emptyString = "";
    cacheDir = reader->getSetting(reader->appSpecificLocation("XDG_CACHE_HOME"), emptyString);

    if (cacheDir.empty()) {
        cacheDir = reader->getSetting(reader->appSpecificLocation("HOME"), emptyString);
        if (cacheDir.empty()) {
            return false;
        }

        // .cache might not exist on fresh installation
        cacheDir = makePath(cacheDir, ".cache/");
        if (!NEO::SysCalls::pathExists(cacheDir)) {
            NEO::SysCalls::mkdir(cacheDir);
        }

        return createCompilerCachePath(cacheDir);
    }

    if (NEO::SysCalls::pathExists(cacheDir)) {
        return createCompilerCachePath(cacheDir);
    }

    return false;
}

time_t getFileModificationTime(const std::string &path) {
    struct stat st;
    if (NEO::SysCalls::stat(path, &st) == 0) {
        return st.st_mtim.tv_sec;
    }
    return 0;
}

size_t getFileSize(const std::string &path) {
    struct stat st;
    if (NEO::SysCalls::stat(path, &st) == 0) {
        return static_cast<size_t>(st.st_size);
    }
    return 0u;
}
} // namespace NEO