1# Generate an ELF symbol version map a-la Solaris and GNU ld.
2#	Copyright (C) 2007-2016 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
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  split ($3, s, "@")
50  def[s[1]] = 1;
51  sawsymbol = 1;
52  next;
53}
54
55state == "nm" {
56  next;
57}
58
59# Now we process a simplified variant of the Solaris symbol version
60# script.  We have one symbol per line, no semicolons, simple markers
61# for beginning and ending each section, and %inherit markers for
62# describing version inheritance.  A symbol may appear in more than
63# one symbol version, and the last seen takes effect.
64# The magic version name '%exclude' causes all the symbols given that
65# version to be dropped from the output (unless a later version overrides).
66
67NF == 3 && $1 == "%inherit" {
68  inherit[$2] = $3;
69  next;
70}
71
72NF == 2 && $2 == "{" {
73  if ($1 != "%exclude")
74    libs[$1] = 1;
75  thislib = $1;
76  next;
77}
78
79$1 == "}" {
80  thislib = "";
81  next;
82}
83
84{
85  sym = prefix $1;
86  symbols[sym] = 1
87  if (thislib != "%exclude")
88    ver[sym, thislib] = 1;
89  else {
90    for (l in libs)
91      ver[sym, l] = 0;
92  }
93  next;
94}
95
96END {
97  if (!sawsymbol)
98    {
99      print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
100      exit 1;
101    }
102  for (l in libs)
103    output(l);
104}
105
106function output(lib) {
107  if (done[lib])
108    return;
109  done[lib] = 1;
110  if (inherit[lib])
111    output(inherit[lib]);
112
113  empty=1
114  for (sym in symbols)
115    if ((ver[sym, lib] != 0) && (sym in def))
116      {
117	if (empty)
118	  {
119	    printf("%s {\n", lib);
120	    printf("  global:\n");
121	    empty = 0;
122	  }
123	printf("\t%s;\n", sym);
124      }
125
126  if (empty)
127    {
128      for (l in libs)
129	if (inherit[l] == lib)
130	  inherit[l] = inherit[lib];
131    }
132  else if (inherit[lib])
133    printf("} %s;\n", inherit[lib]);
134  else
135    printf ("\n  local:\n\t*;\n};\n");
136}
137