mkmap-symver.awk revision 96263 
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, 59 Temple Place - Suite 330, Boston MA
19# 02111-1307, USA.
20
21BEGIN {
22  state = "nm";
23}
24
25# Remove comment and blank lines.
26/^ *#/ || /^ *$/ {
27  next;
28}
29
30# We begin with nm input.  Collect the set of symbols that are present
31# so that we can not emit them into the final version script -- Solaris
32# complains at us if we do.
33
34state == "nm" && /^%%/ {
35  state = "ver";
36  next;
37}
38
39state == "nm" && ($1 == "U" || $2 == "U") {
40  next;
41}
42
43state == "nm" && NF == 3 {
44  def[$3] = 1;
45  next;
46}
47
48state == "nm" {
49  next;
50}
51
52# Now we process a simplified variant of the Solaris symbol version
53# script.  We have one symbol per line, no semicolons, simple markers
54# for beginning and ending each section, and %inherit markers for
55# describing version inheritence.  A symbol may appear in more than
56# one symbol version, and the last seen takes effect.
57
58NF == 3 && $1 == "%inherit" {
59  inherit[$2] = $3;
60  next;
61}
62
63NF == 2 && $2 == "{" {
64  libs[$1] = 1;
65  thislib = $1;
66  next;
67}
68
69$1 == "}" {
70  thislib = "";
71  next;
72}
73
74{
75  ver[$1] = thislib;
76  next;
77}
78
79END {
80  for (l in libs)
81    output(l);
82}
83
84function output(lib) {
85  if (done[lib])
86    return;
87  done[lib] = 1;
88  if (inherit[lib])
89    output(inherit[lib]);
90
91  printf("%s {\n", lib);
92  printf("  global:\n");
93  for (sym in ver)
94    if ((ver[sym] == lib) && (sym in def))
95      {
96	printf("\t%s;\n", sym);
97	if (dotsyms)
98	  printf("\t.%s;\n", sym);
99      }
100
101  if (inherit[lib])
102    printf("} %s;\n", inherit[lib]);
103  else
104    printf ("\n  local:\n\t*;\n};\n");
105}
106