/*
 * 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.
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package jdk.tools.jaotc.binformat.elf;

import java.nio.ByteBuffer;

import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Rel;
import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Rela;
import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Shdr;
import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Sym;

final class ElfSection {
    private final String name;
    private final ByteBuffer section;
    private final byte[] data;
    private final boolean hasrelocations;
    private final int sectionIndex;

    
String holding section name strings.
/** * String holding section name strings. */
private static final StringBuilder sectNameTab = new StringBuilder();
Keeps track of bytes in section string table since strTabContent.length() is number of chars, not bytes.
/** * Keeps track of bytes in section string table since strTabContent.length() is number of chars, * not bytes. */
private static int shStrTabNrOfBytes = 0; ElfSection(String sectName, byte[] sectData, int sectFlags, int sectType, boolean hasRelocations, int align, int sectIndex) { section = ElfByteBuffer.allocate(Elf64_Shdr.totalsize); name = sectName; // Return all 0's for NULL section if (sectIndex == 0) { sectNameTab.append('\0'); shStrTabNrOfBytes += 1; data = null; hasrelocations = false; sectionIndex = 0; return; } section.putInt(Elf64_Shdr.sh_name.off, shStrTabNrOfBytes); sectNameTab.append(sectName).append('\0'); shStrTabNrOfBytes += (sectName.getBytes().length + 1); section.putInt(Elf64_Shdr.sh_type.off, sectType); section.putLong(Elf64_Shdr.sh_flags.off, sectFlags); section.putLong(Elf64_Shdr.sh_addr.off, 0); section.putLong(Elf64_Shdr.sh_offset.off, 0); if (sectName.equals(".shstrtab")) { section.putLong(Elf64_Shdr.sh_size.off, shStrTabNrOfBytes); data = sectNameTab.toString().getBytes(); } else { data = sectData; section.putLong(Elf64_Shdr.sh_size.off, sectData.length); } section.putLong(Elf64_Shdr.sh_entsize.off, 0); // Determine the entrysize // based on type of section switch (sectType) { case Elf64_Shdr.SHT_SYMTAB: section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Sym.totalsize); break; case Elf64_Shdr.SHT_RELA: section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Rela.totalsize); break; case Elf64_Shdr.SHT_REL: section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Rel.totalsize); break; default: break; } section.putLong(Elf64_Shdr.sh_addralign.off, align); hasrelocations = hasRelocations; sectionIndex = sectIndex; } String getName() { return name; } long getSize() { return section.getLong(Elf64_Shdr.sh_size.off); } int getDataAlign() { return ((int) section.getLong(Elf64_Shdr.sh_addralign.off)); } // Alignment requirements for the Elf64_Shdr structures static int getShdrAlign() { return (4); } byte[] getArray() { return section.array(); } byte[] getDataArray() { return data; } void setOffset(long offset) { section.putLong(Elf64_Shdr.sh_offset.off, offset); } void setLink(int link) { section.putInt(Elf64_Shdr.sh_link.off, link); } void setInfo(int info) { section.putInt(Elf64_Shdr.sh_info.off, info); } long getOffset() { return (section.getLong(Elf64_Shdr.sh_offset.off)); } boolean hasRelocations() { return hasrelocations; } int getSectionId() { return sectionIndex; } }