mkmap-symver.awk revision 122180 
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  sawsymbol = 0;
24}
25
26# Remove comment and blank lines.
27/^ *#/ || /^ *$/ {
28  next;
29}
30
31# We begin with nm input.  Collect the set of symbols that are present
32# so that we can not emit them into the final version script -- Solaris
33# complains at us if we do.
34
35state == "nm" && /^%%/ {
36  state = "ver";
37  next;
38}
39
40state == "nm" && ($1 == "U" || $2 == "U") {
41  next;
42}
43
44state == "nm" && NF == 3 {
45  def[$3] = 1;
46  sawsymbol = 1;
47  next;
48}
49
50state == "nm" {
51  next;
52}
53
54# Now we process a simplified variant of the Solaris symbol version
55# script.  We have one symbol per line, no semicolons, simple markers
56# for beginning and ending each section, and %inherit markers for
57# describing version inheritence.  A symbol may appear in more than
58# one symbol version, and the last seen takes effect.
59
60NF == 3 && $1 == "%inherit" {
61  inherit[$2] = $3;
62  next;
63}
64
65NF == 2 && $2 == "{" {
66  libs[$1] = 1;
67  thislib = $1;
68  next;
69}
70
71$1 == "}" {
72  thislib = "";
73  next;
74}
75
76{
77  ver[$1] = thislib;
78  next;
79}
80
81END {
82  if (!sawsymbol)
83    {
84      print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
85      exit 1;
86    }
87  for (l in libs)
88    output(l);
89}
90
91function output(lib) {
92  if (done[lib])
93    return;
94  done[lib] = 1;
95  if (inherit[lib])
96    output(inherit[lib]);
97
98  empty=1
99  for (sym in ver)
100    if ((ver[sym] == lib) && (sym in def))
101      {
102	if (empty)
103	  {
104	    printf("%s {\n", lib);
105	    printf("  global:\n");
106	    empty = 0;
107	  }
108	printf("\t%s;\n", sym);
109	if (dotsyms)
110	  printf("\t.%s;\n", sym);
111      }
112
113  if (empty)
114    {
115      for (l in libs)
116	if (inherit[l] == lib)
117	  inherit[l] = inherit[lib];
118    }
119  else if (inherit[lib])
120    printf("} %s;\n", inherit[lib]);
121  else
122    printf ("\n  local:\n\t*;\n};\n");
123}
124