libgcc/mkmap-flat.awk

   1 # Generate a flat list of symbols to export.
   2 #       Copyright (C) 2007, 2008, 2009, 2011  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 # Options:
  22 #   "-v leading_underscore=1" : Symbols in map need leading underscore.
  23 #   "-v osf_export=1"         : Create -input file for Tru64 UNIX linker
  24 #                               instead of map file.
  25 #   "-v pe_dll=1"             : Create .DEF file for Windows PECOFF
  26 #                               DLL link instead of map file.
  27
  28 BEGIN {
  29   state = "nm";
  30   excluding = 0;
  31   if (leading_underscore)
  32     prefix = "_";
  33   else
  34     prefix = "";
  35 }
  36
  37 # Remove comment and blank lines.
  38 /^ *#/ || /^ *$/ {
  39   next;
  40 }
  41
  42 # We begin with nm input.  Collect the set of symbols that are present
  43 # so that we can elide undefined symbols.
  44
  45 state == "nm" && /^%%/ {
  46   state = "ver";
  47   next;
  48 }
  49
  50 state == "nm" && ($1 == "U" || $2 == "U") {
  51   next;
  52 }
  53
  54 state == "nm" && NF == 3 {
  55   def[$3] = 1;
  56   next;
  57 }
  58
  59 state == "nm" {
  60   next;
  61 }
  62
  63 # Now we process a simplified variant of the Solaris symbol version
  64 # script.  We have one symbol per line, no semicolons, simple markers
  65 # for beginning and ending each section, and %inherit markers for
  66 # describing version inheritance.  A symbol may appear in more than
  67 # one symbol version, and the last seen takes effect.
  68 # The magic version name '%exclude' causes all the symbols given that
  69 # version to be dropped from the output (unless a later version overrides).
  70
  71 NF == 3 && $1 == "%inherit" {
  72   next;
  73 }
  74
  75 NF == 2 && $2 == "{" {
  76   if ($1 == "%exclude")
  77     excluding = 1;
  78   next;
  79 }
  80
  81 $1 == "}" {
  82   excluding = 0;
  83   next;
  84 }
  85
  86 {
  87   sym = prefix $1;
  88   if (excluding)
  89     delete export[sym];
  90   else
  91     export[sym] = 1;
  92   next;
  93 }
  94
  95 END {
  96
  97   if (pe_dll) {
  98     print "LIBRARY " pe_dll;
  99     print "EXPORTS";
 100   }
 101
 102   for (sym in export)
 103     if (def[sym] || (pe_dll && def["_" sym])) {
 104       if (!osf_export)
 105         print sym;
 106       else
 107         print "-exported_symbol " sym;
 108     }
 109 }