src/jdk.aot/share/classes/jdk.tools.jaotc.binformat/src/jdk/tools/jaotc/binformat/macho/MachOSection.java

/*
 * Copyright (c) 2017, 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
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package jdk.tools.jaotc.binformat.macho;

import java.nio.ByteBuffer;

import jdk.tools.jaotc.binformat.macho.MachO.section_64;
import jdk.tools.jaotc.binformat.macho.MachOByteBuffer;

final class MachOSection {
    private final ByteBuffer section;
    private final byte[] data;
    private final boolean hasrelocations;

    MachOSection(String sectName, String segName, byte[] sectData, int sectFlags, boolean hasRelocations, int align) {
        section = MachOByteBuffer.allocate(section_64.totalsize);

        // TODO: Hotspot uses long section names.
        // They are getting truncated.
        // Is this a problem??
        byte[] sectNameBytes = sectName.getBytes();
        int sectNameMax = section_64.sectname.sz < sectNameBytes.length ? section_64.sectname.sz : sectNameBytes.length;

        for (int i = 0; i < sectNameMax; i++) {
            section.put(section_64.sectname.off + i, sectNameBytes[i]);
        }
        byte[] segNameBytes = segName.getBytes();
        int segNameMax = section_64.segname.sz < segNameBytes.length ? section_64.segname.sz : segNameBytes.length;

        for (int i = 0; i < segNameMax; i++) {
            section.put(section_64.segname.off + i, segNameBytes[i]);
        }
        section.putLong(section_64.size.off, sectData.length);

        section.putInt(section_64.align.off, 31 - Integer.numberOfLeadingZeros(align));

        section.putInt(section_64.flags.off, sectFlags);

        data = sectData;

        hasrelocations = hasRelocations;
    }

    long getSize() {
        return section.getLong(section_64.size.off);
    }

    int getAlign() {
        return (1 << section.getInt(section_64.align.off));
    }

    byte[] getArray() {
        return section.array();
    }

    byte[] getDataArray() {
        return data;
    }

    void setAddr(long addr) {
        section.putLong(section_64.addr.off, addr);
    }

    long getAddr() {
        return (section.getLong(section_64.addr.off));
    }

    void setOffset(int offset) {
        section.putInt(section_64.offset.off, offset);
    }

    int getOffset() {
        return (section.getInt(section_64.offset.off));
    }

    void setReloff(int offset) {
        section.putInt(section_64.reloff.off, offset);
    }

    void setRelcount(int count) {
        section.putInt(section_64.nreloc.off, count);
    }

    boolean hasRelocations() {
        return hasrelocations;
    }
}