141 lines
3.0 KiB
Awk
141 lines
3.0 KiB
Awk
# Generate an ELF symbol version map a-la Solaris and GNU ld.
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# Copyright (C) 2007-2018 Free Software Foundation, Inc.
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# Contributed by Richard Henderson <rth@cygnus.com>
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#
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# This file is part of GCC.
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#
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# GCC is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 3, or (at your option) any later
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# version.
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#
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# GCC is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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# License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GCC; see the file COPYING3. If not see
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# <http://www.gnu.org/licenses/>.
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BEGIN {
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state = "nm";
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sawsymbol = 0;
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if (leading_underscore)
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prefix = "_";
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else
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prefix = "";
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}
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# Remove comment and blank lines.
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/^ *#/ || /^ *$/ {
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next;
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}
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# We begin with nm input. Collect the set of symbols that are present
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# so that we can not emit them into the final version script -- Solaris
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# complains at us if we do.
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state == "nm" && /^%%/ {
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state = "ver";
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next;
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}
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state == "nm" && ($1 == "U" || $2 == "U") {
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next;
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}
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state == "nm" && NF == 3 {
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split ($3, s, "@")
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if (skip_underscore && substr(s[1], 1, 1) == "_")
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symname = substr(s[1], 2);
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else
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symname = s[1];
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def[symname] = 1;
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sawsymbol = 1;
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next;
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}
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state == "nm" {
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next;
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}
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# Now we process a simplified variant of the Solaris symbol version
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# script. We have one symbol per line, no semicolons, simple markers
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# for beginning and ending each section, and %inherit markers for
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# describing version inheritance. A symbol may appear in more than
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# one symbol version, and the last seen takes effect.
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# The magic version name '%exclude' causes all the symbols given that
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# version to be dropped from the output (unless a later version overrides).
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NF == 3 && $1 == "%inherit" {
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inherit[$2] = $3;
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next;
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}
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NF == 2 && $2 == "{" {
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if ($1 != "%exclude")
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libs[$1] = 1;
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thislib = $1;
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next;
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}
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$1 == "}" {
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thislib = "";
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next;
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}
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{
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sym = prefix $1;
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symbols[sym] = 1
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if (thislib != "%exclude")
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ver[sym, thislib] = 1;
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else {
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for (l in libs)
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ver[sym, l] = 0;
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}
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next;
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}
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END {
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if (!sawsymbol)
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{
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print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
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exit 1;
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}
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for (l in libs)
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output(l);
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}
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function output(lib) {
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if (done[lib])
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return;
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done[lib] = 1;
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if (inherit[lib])
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output(inherit[lib]);
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empty=1
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for (sym in symbols)
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if ((ver[sym, lib] != 0) && (sym in def))
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{
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if (empty)
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{
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printf("%s {\n", lib);
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printf(" global:\n");
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empty = 0;
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}
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printf("\t%s;\n", sym);
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}
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if (empty)
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{
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for (l in libs)
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if (inherit[l] == lib)
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inherit[l] = inherit[lib];
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}
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else if (inherit[lib])
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printf("} %s;\n", inherit[lib]);
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else
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printf ("\n local:\n\t*;\n};\n");
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}
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