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
28BEGIN {
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
45state == "nm" && /^%%/ {
46  state = "ver";
47  next;
48}
49
50state == "nm" && ($1 == "U" || $2 == "U") {
51  next;
52}
53
54state == "nm" && NF == 3 {
55  def[$3] = 1;
56  next;
57}
58
59state == "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
71NF == 3 && $1 == "%inherit" {
72  next;
73}
74
75NF == 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
95END {
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}
110