/*

 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.tools.jaotc.binformat.elf;

import java.nio.ByteOrder;

import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Ehdr;

/**

 * Class that abstracts MACH-O target details.

 *

 */

final class ElfTargetInfo {

    /**

     * Target architecture.

     */

    private static final char arch;

    /**

     * Architecture endian-ness.

     */

    private static final int endian = Elf64_Ehdr.ELFDATA2LSB;

    /**

     * Target OS string.

     */

    private static String osName;

    static {

        // Find the target arch details

        String archStr = System.getProperty("os.arch").toLowerCase();

        if (ByteOrder.nativeOrder() != ByteOrder.LITTLE_ENDIAN) {

            System.out.println("Only Little Endian byte order supported!");

        }

        if (archStr.equals("amd64") || archStr.equals("x86_64")) {

            arch = Elf64_Ehdr.EM_X86_64;

        } else if (archStr.equals("aarch64")) {

            arch = Elf64_Ehdr.EM_AARCH64;

        } else {

            System.out.println("Unsupported architecture " + archStr);

            arch = Elf64_Ehdr.EM_NONE;

        }

        osName = System.getProperty("os.name").toLowerCase();

        if (!osName.equals("linux") && !osName.equals("sunos")) {

            System.out.println("Unsupported Operating System " + osName);

            osName = "Unknown";

        }

    }

    static char getElfArch() {

        return arch;

    }

    static int getElfEndian() {

        return endian;

    }

    static String getOsName() {

        return osName;

    }

}