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comparison gcc/mkmap-symver.awk @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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-1:000000000000 0:a06113de4d67
1 # Generate an ELF symbol version map a-la Solaris and GNU ld.
2 # Copyright (C) 2007, 2008 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 BEGIN {
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
39 state == "nm" && /^%%/ {
40 state = "ver";
41 next;
42 }
43
44 state == "nm" && ($1 == "U" || $2 == "U") {
45 next;
46 }
47
48 state == "nm" && NF == 3 {
49 split ($3, s, "@")
50 def[s[1]] = 1;
51 sawsymbol = 1;
52 next;
53 }
54
55 state == "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
67 NF == 3 && $1 == "%inherit" {
68 inherit[$2] = $3;
69 next;
70 }
71
72 NF == 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
96 END {
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
106 function 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 }