gcc/mkmap-flat.awk

   1 # Generate a flat list of symbols to export.
   2 #       Copyright (C) 2007, 2008  Free Software Foundation, Inc.
   3 #       Contributed by Richard Henderson <rth@cygnus.com>
   4 #
   5 # This file is part of GCC.
   6 #
   7 # GCC is free software; you can redistribute it and/or modify it under
   8 # the terms of the GNU General Public License as published by the Free
   9 # Software Foundation; either version 3, or (at your option) any later
  10 # version.
  11 #
  12 # GCC is distributed in the hope that it will be useful, but WITHOUT
  13 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14 # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15 # License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with GCC; see the file COPYING3.  If not see
  19 # <http://www.gnu.org/licenses/>.
  20
  21 BEGIN {
  22   state = "nm";
  23   excluding = 0;
  24   if (leading_underscore)
  25     prefix = "_";
  26   else
  27     prefix = "";
  28 }
  29
  30 # Remove comment and blank lines.
  31 /^ *#/ || /^ *$/ {
  32   next;
  33 }
  34
  35 # We begin with nm input.  Collect the set of symbols that are present
  36 # so that we can elide undefined symbols.
  37
  38 state == "nm" && /^%%/ {
  39   state = "ver";
  40   next;
  41 }
  42
  43 state == "nm" && ($1 == "U" || $2 == "U") {
  44   next;
  45 }
  46
  47 state == "nm" && NF == 3 {
  48   def[$3] = 1;
  49   next;
  50 }
  51
  52 state == "nm" {
  53   next;
  54 }
  55
  56 # Now we process a simplified variant of the Solaris symbol version
  57 # script.  We have one symbol per line, no semicolons, simple markers
  58 # for beginning and ending each section, and %inherit markers for
  59 # describing version inheritance.  A symbol may appear in more than
  60 # one symbol version, and the last seen takes effect.
  61 # The magic version name '%exclude' causes all the symbols given that
  62 # version to be dropped from the output (unless a later version overrides).
  63
  64 NF == 3 && $1 == "%inherit" {
  65   next;
  66 }
  67
  68 NF == 2 && $2 == "{" {
  69   if ($1 == "%exclude")
  70     excluding = 1;
  71   next;
  72 }
  73
  74 $1 == "}" {
  75   excluding = 0;
  76   next;
  77 }
  78
  79 {
  80   sym = prefix $1;
  81   if (excluding)
  82     delete export[sym];
  83   else
  84     export[sym] = 1;
  85   next;
  86 }
  87
  88 END {
  89   for (sym in export)
  90     if (def[sym])
  91       print sym;
  92 }