# Generate a flat list of symbols to export.
#       Copyright (C) 2007-2024 Free Software Foundation, Inc.
#       Contributed by Richard Henderson <[email protected]>
#
# This file is part of GCC.
#
# GCC is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 3, or (at your option) any later
# version.
#
# GCC is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
# License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.

# Options:
#   "-v leading_underscore=1" : Symbols in map need leading underscore.
#   "-v pe_dll=1"             : Create .DEF file for Windows PECOFF
#                               DLL link instead of map file.

BEGIN {
 state = "nm";
 excluding = 0;
 if (leading_underscore)
   prefix = "_";
 else
   prefix = "";
}

# Remove comment and blank lines.
/^ *#/ || /^ *$/ {
 next;
}

# We begin with nm input.  Collect the set of symbols that are present
# so that we can elide undefined symbols.

state == "nm" && /^%%/ {
 state = "ver";
 next;
}

state == "nm" && ($1 == "U" || $2 == "U") {
 next;
}

state == "nm" && NF == 3 {
 def[$3] = 1;
 next;
}

state == "nm" {
 next;
}

# Now we process a simplified variant of the Solaris symbol version
# script.  We have one symbol per line, no semicolons, simple markers
# for beginning and ending each section, and %inherit markers for
# describing version inheritance.  A symbol may appear in more than
# one symbol version, and the last seen takes effect.
# The magic version name '%exclude' causes all the symbols given that
# version to be dropped from the output (unless a later version overrides).

NF == 3 && $1 == "%inherit" {
 next;
}

NF == 2 && $2 == "{" {
 if ($1 == "%exclude")
   excluding = 1;
 next;
}

$1 == "}" {
 excluding = 0;
 next;
}

{
 sym = prefix $1;
 if (excluding)
   delete export[sym];
 else
   export[sym] = 1;
 next;
}

END {

 if (pe_dll) {
   print "LIBRARY " pe_dll;
   print "EXPORTS";
 }

 for (sym in export)
   if (def[sym] || (pe_dll && def["_" sym]))
     print sym;
}