gdb/dwarf-index-common.h

   1 /* Things needed for both reading and writing DWARF indices.
   2
   3    Copyright (C) 1994-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef DWARF_INDEX_COMMON_H
  21 #define DWARF_INDEX_COMMON_H
  22
  23 /* The suffix for an index file.  */
  24 #define INDEX4_SUFFIX ".gdb-index"
  25 #define INDEX5_SUFFIX ".debug_names"
  26 #define DEBUG_STR_SUFFIX ".debug_str"
  27
  28 /* All offsets in the index are of this type.  It must be
  29    architecture-independent.  */
  30 typedef uint32_t offset_type;
  31
  32 #if WORDS_BIGENDIAN
  33
  34 /* Convert VALUE between big- and little-endian.  */
  35
  36 static inline offset_type
  37 byte_swap (offset_type value)
  38 {
  39   offset_type result;
  40
  41   result = (value & 0xff) << 24;
  42   result |= (value & 0xff00) << 8;
  43   result |= (value & 0xff0000) >> 8;
  44   result |= (value & 0xff000000) >> 24;
  45   return result;
  46 }
  47
  48 #define MAYBE_SWAP(V)  byte_swap (V)
  49
  50 #else
  51 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
  52 #endif /* WORDS_BIGENDIAN */
  53
  54 /* The hash function for strings in the mapped index.  This is the same as
  55    SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
  56    implementation.  This is necessary because the hash function is tied to the
  57    format of the mapped index file.  The hash values do not have to match with
  58    SYMBOL_HASH_NEXT.
  59
  60    Use INT_MAX for INDEX_VERSION if you generate the current index format.  */
  61
  62 hashval_t mapped_index_string_hash (int index_version, const void *p);
  63
  64 /* Symbol name hashing function as specified by DWARF-5.  */
  65
  66 uint32_t dwarf5_djb_hash (const char *str_);
  67
  68 #endif /* DWARF_INDEX_COMMON_H */