1# Generate a flat list of symbols to export.
2#	Copyright (C) 2007-2015 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 pe_dll=1"             : Create .DEF file for Windows PECOFF
24#                               DLL link instead of map file.
25
26BEGIN {
27  state = "nm";
28  excluding = 0;
29  if (leading_underscore)
30    prefix = "_";
31  else
32    prefix = "";
33}
34
35# Remove comment and blank lines.
36/^ *#/ || /^ *$/ {
37  next;
38}
39
40# We begin with nm input.  Collect the set of symbols that are present
41# so that we can elide undefined symbols.
42
43state == "nm" && /^%%/ {
44  state = "ver";
45  next;
46}
47
48state == "nm" && ($1 == "U" || $2 == "U") {
49  next;
50}
51
52state == "nm" && NF == 3 {
53  def[$3] = 1;
54  next;
55}
56
57state == "nm" {
58  next;
59}
60
61# Now we process a simplified variant of the Solaris symbol version
62# script.  We have one symbol per line, no semicolons, simple markers
63# for beginning and ending each section, and %inherit markers for
64# describing version inheritance.  A symbol may appear in more than
65# one symbol version, and the last seen takes effect.
66# The magic version name '%exclude' causes all the symbols given that
67# version to be dropped from the output (unless a later version overrides).
68
69NF == 3 && $1 == "%inherit" {
70  next;
71}
72
73NF == 2 && $2 == "{" {
74  if ($1 == "%exclude")
75    excluding = 1;
76  next;
77}
78
79$1 == "}" {
80  excluding = 0;
81  next;
82}
83
84{
85  sym = prefix $1;
86  if (excluding)
87    delete export[sym];
88  else
89    export[sym] = 1;
90  next;
91}
92
93END {
94
95  if (pe_dll) {
96    print "LIBRARY " pe_dll;
97    print "EXPORTS";
98  }
99
100  for (sym in export)
101    if (def[sym] || (pe_dll && def["_" sym]))
102      print sym;
103}
104