1# Generate a flat list of symbols to export.
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, 51 Franklin Street, Fifth Floor, Boston MA
19# 02110-1301, USA.
20
21BEGIN {
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
38state == "nm" && /^%%/ {
39  state = "ver";
40  next;
41}
42
43state == "nm" && ($1 == "U" || $2 == "U") {
44  next;
45}
46
47state == "nm" && NF == 3 {
48  def[$3] = 1;
49  next;
50}
51
52state == "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 inheritence.  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
64NF == 3 && $1 == "%inherit" {
65  next;
66}
67
68NF == 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
88END {
89  for (sym in export)
90    if (def[sym])
91      print sym;
92}
93