1# Generate an ELF symbol version map a-la Solaris and GNU ld.
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  sawsymbol = 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 not emit them into the final version script -- Solaris
37# complains at us if we do.
38
39state == "nm" && /^%%/ {
40  state = "ver";
41  next;
42}
43
44state == "nm" && ($1 == "U" || $2 == "U") {
45  next;
46}
47
48state == "nm" && NF == 3 {
49  def[$3] = 1;
50  sawsymbol = 1;
51  next;
52}
53
54state == "nm" {
55  next;
56}
57
58# Now we process a simplified variant of the Solaris symbol version
59# script.  We have one symbol per line, no semicolons, simple markers
60# for beginning and ending each section, and %inherit markers for
61# describing version inheritence.  A symbol may appear in more than
62# one symbol version, and the last seen takes effect.
63# The magic version name '%exclude' causes all the symbols given that
64# version to be dropped from the output (unless a later version overrides).
65
66NF == 3 && $1 == "%inherit" {
67  inherit[$2] = $3;
68  next;
69}
70
71NF == 2 && $2 == "{" {
72  if ($1 != "%exclude")
73    libs[$1] = 1;
74  thislib = $1;
75  next;
76}
77
78$1 == "}" {
79  thislib = "";
80  next;
81}
82
83{
84  sym = prefix $1;
85  if (thislib != "%exclude")
86    ver[sym] = thislib;
87  else
88    delete ver[sym];
89  next;
90}
91
92END {
93  if (!sawsymbol)
94    {
95      print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
96      exit 1;
97    }
98  for (l in libs)
99    output(l);
100}
101
102function output(lib) {
103  if (done[lib])
104    return;
105  done[lib] = 1;
106  if (inherit[lib])
107    output(inherit[lib]);
108
109  empty=1
110  for (sym in ver)
111    if ((ver[sym] == lib) && (sym in def))
112      {
113	if (empty)
114	  {
115	    printf("%s {\n", lib);
116	    printf("  global:\n");
117	    empty = 0;
118	  }
119	printf("\t%s;\n", sym);
120      }
121
122  if (empty)
123    {
124      for (l in libs)
125	if (inherit[l] == lib)
126	  inherit[l] = inherit[lib];
127    }
128  else if (inherit[lib])
129    printf("} %s;\n", inherit[lib]);
130  else
131    printf ("\n  local:\n\t*;\n};\n");
132}
133