gcc/mkmap-symver.awk

   1 # Generate an ELF symbol version map a-la Solaris and GNU ld.
   2 #       Contributed by Richard Henderson <rth@cygnus.com>
   3 #
   4 # This file is part of GCC.
   5 #
   6 # GCC is free software; you can redistribute it and/or modify it under
   7 # the terms of the GNU General Public License as published by the Free
   8 # Software Foundation; either version 2, or (at your option) any later
   9 # version.
  10 #
  11 # GCC is distributed in the hope that it will be useful, but WITHOUT
  12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13 # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14 # License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with GCC; see the file COPYING.  If not, write to the Free
  18 # Software Foundation, 59 Temple Place - Suite 330, Boston MA
  19 # 02111-1307, USA.
  20
  21 BEGIN {
  22   state = "nm";
  23 }
  24
  25 # Remove comment and blank lines.
  26 /^ *#/ || /^ *$/ {
  27   next;
  28 }
  29
  30 # We begin with nm input.  Collect the set of symbols that are present
  31 # so that we can not emit them into the final version script -- Solaris
  32 # complains at us if we do.
  33
  34 state == "nm" && /^%%/ {
  35   state = "ver";
  36   next;
  37 }
  38
  39 state == "nm" && ($1 == "U" || $2 == "U") {
  40   next;
  41 }
  42
  43 state == "nm" && NF == 3 {
  44   def[$3] = 1;
  45   next;
  46 }
  47
  48 state == "nm" {
  49   next;
  50 }
  51
  52 # Now we process a simplified variant of the Solaris symbol version
  53 # script.  We have one symbol per line, no semicolons, simple markers
  54 # for beginning and ending each section, and %inherit markers for
  55 # describing version inheritence.  A symbol may appear in more than
  56 # one symbol version, and the last seen takes effect.
  57
  58 NF == 3 && $1 == "%inherit" {
  59   inherit[$2] = $3;
  60   next;
  61 }
  62
  63 NF == 2 && $2 == "{" {
  64   libs[$1] = 1;
  65   thislib = $1;
  66   next;
  67 }
  68
  69 $1 == "}" {
  70   thislib = "";
  71   next;
  72 }
  73
  74 {
  75   ver[$1] = thislib;
  76   next;
  77 }
  78
  79 END {
  80   for (l in libs)
  81     output(l);
  82 }
  83
  84 function output(lib) {
  85   if (done[lib])
  86     return;
  87   done[lib] = 1;
  88   if (inherit[lib])
  89     output(inherit[lib]);
  90
  91   printf("%s {\n", lib);
  92   printf("  global:\n");
  93   for (sym in ver)
  94     if ((ver[sym] == lib) && (sym in def))
  95       printf("\t%s;\n", sym);
  96
  97   if (inherit[lib])
  98     printf("} %s;\n", inherit[lib]);
  99   else
 100     printf ("\n  local:\n\t*;\n};\n");
 101 }