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# Generate an ELF symbol version map a-la Solaris and GNU ld.

#       Copyright (C) 2007  Free Software Foundation, Inc.

#       Contributed by Richard Henderson <rth@cygnus.com>

#

# 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/>.

BEGIN {

  state = "nm";

  sawsymbol = 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 not emit them into the final version script -- Solaris

# complains at us if we do.

state == "nm" && /^%%/ {

  state = "ver";

  next;

}

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

  next;

}

state == "nm" && NF == 3 {

  def[$3] = 1;

  sawsymbol = 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 inheritence.  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" {

  inherit[$2] = $3;

  next;

}

NF == 2 && $2 == "{" {

  if ($1 != "%exclude")

    libs[$1] = 1;

  thislib = $1;

  next;

}

$1 == "}" {

  thislib = "";

  next;

}

{

  sym = prefix $1;

  if (thislib != "%exclude")

    ver[sym] = thislib;

  else

    delete ver[sym];

  next;

}

END {

  if (!sawsymbol)

    {

      print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";

      exit 1;

    }

  for (l in libs)

    output(l);

}

function output(lib) {

  if (done[lib])

    return;

  done[lib] = 1;

  if (inherit[lib])

    output(inherit[lib]);

  empty=1

  for (sym in ver)

    if ((ver[sym] == lib) && (sym in def))

      {

        if (empty)

          {

            printf("%s {\n", lib);

            printf("  global:\n");

            empty = 0;

          }

        printf("\t%s;\n", sym);

      }

  if (empty)

    {

      for (l in libs)

        if (inherit[l] == lib)

          inherit[l] = inherit[lib];

    }

  else if (inherit[lib])

    printf("} %s;\n", inherit[lib]);

  else

    printf ("\n  local:\n\t*;\n};\n");

}