JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2017, 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
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 */



package jdk.tools.jaotc.binformat.macho;

import java.nio.ByteOrder;
import jdk.tools.jaotc.binformat.macho.MachO.mach_header_64;

/**
 * Class that abstracts MACH-O target details.
 *
 */
final class MachOTargetInfo {
    /**
     * Target architecture and subtype.
     */
    private static final int arch;
    private static final int subarch;

    /**
     * Architecture endian-ness.
     */
    private static final int endian = mach_header_64.CPU_SUBTYPE_LITTLE_ENDIAN;

    /**
     * Target OS string.
     */
    private static final 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 = mach_header_64.CPU_TYPE_X86_64;
            subarch = mach_header_64.CPU_SUBTYPE_I386_ALL;
        } else {
            System.out.println("Unsupported architecture " + archStr);
            arch = mach_header_64.CPU_TYPE_ANY;
            subarch = 0;
        }

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


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