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   sawsymbol = 0;
  24 }
  25
  26 # Remove comment and blank lines.
  27 /^ *#/ || /^ *$/ {
  28   next;
  29 }
  30
  31 # We begin with nm input.  Collect the set of symbols that are present
  32 # so that we can not emit them into the final version script -- Solaris
  33 # complains at us if we do.
  34
  35 state == "nm" && /^%%/ {
  36   state = "ver";
  37   next;
  38 }
  39
  40 state == "nm" && ($1 == "U" || $2 == "U") {
  41   next;
  42 }
  43
  44 state == "nm" && NF == 3 {
  45   def[$3] = 1;
  46   sawsymbol = 1;
  47   next;
  48 }
  49
  50 state == "nm" {
  51   next;
  52 }
  53
  54 # Now we process a simplified variant of the Solaris symbol version
  55 # script.  We have one symbol per line, no semicolons, simple markers
  56 # for beginning and ending each section, and %inherit markers for
  57 # describing version inheritence.  A symbol may appear in more than
  58 # one symbol version, and the last seen takes effect.
  59
  60 NF == 3 && $1 == "%inherit" {
  61   inherit[$2] = $3;
  62   next;
  63 }
  64
  65 NF == 2 && $2 == "{" {
  66   libs[$1] = 1;
  67   thislib = $1;
  68   next;
  69 }
  70
  71 $1 == "}" {
  72   thislib = "";
  73   next;
  74 }
  75
  76 {
  77   ver[$1] = thislib;
  78   next;
  79 }
  80
  81 END {
  82   if (!sawsymbol)
  83     {
  84       print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
  85       exit 1;
  86     }
  87   for (l in libs)
  88     output(l);
  89 }
  90
  91 function output(lib) {
  92   if (done[lib])
  93     return;
  94   done[lib] = 1;
  95   if (inherit[lib])
  96     output(inherit[lib]);
  97
  98   empty=1
  99   for (sym in ver)
 100     if ((ver[sym] == lib) && (sym in def))
 101       {
 102         if (empty)
 103           {
 104             printf("%s {\n", lib);
 105             printf("  global:\n");
 106             empty = 0;
 107           }
 108         printf("\t%s;\n", sym);
 109         if (dotsyms)
 110           printf("\t.%s;\n", sym);
 111       }
 112
 113   if (empty)
 114     {
 115       for (l in libs)
 116         if (inherit[l] == lib)
 117           inherit[l] = inherit[lib];
 118     }
 119   else if (inherit[lib])
 120     printf("} %s;\n", inherit[lib]);
 121   else
 122     printf ("\n  local:\n\t*;\n};\n");
 123 }