1 /*
   2  * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 
  26 package jdk.tools.jaotc.binformat.macho;
  27 
  28 import java.nio.ByteBuffer;
  29 
  30 import jdk.tools.jaotc.binformat.macho.MachO.reloc_info;
  31 
  32 final class MachORelocEntry {
  33     private final ByteBuffer entry;
  34 
  35     MachORelocEntry(int offset, int symno, int pcrel, int length, int isextern, int type) {
  36 
  37         entry = MachOByteBuffer.allocate(reloc_info.totalsize);
  38 
  39         entry.putInt(reloc_info.r_address.off, offset);
  40 
  41         // Encode and store the relocation entry bitfields
  42         // @formatter:off
  43         entry.putInt(reloc_info.r_relocinfo.off,
  44             ((symno    & reloc_info.REL_SYMNUM_MASK) << reloc_info.REL_SYMNUM_SHIFT) |
  45             ((pcrel    & reloc_info.REL_PCREL_MASK)  << reloc_info.REL_PCREL_SHIFT)  |
  46             ((length   & reloc_info.REL_LENGTH_MASK) << reloc_info.REL_LENGTH_SHIFT) |
  47             ((isextern & reloc_info.REL_EXTERN_MASK) << reloc_info.REL_EXTERN_SHIFT) |
  48             ((type     & reloc_info.REL_TYPE_MASK)   << reloc_info.REL_TYPE_SHIFT));
  49         // @formatter:on
  50     }
  51 
  52     byte[] getArray() {
  53         return entry.array();
  54     }
  55 }