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freebsd/share/mk/version_gen.awk
Daniel Eischen 6f91e7a3af When generating the version map file, order versions oldest
first to make it easier for rtld to choose the oldest version
of a symbol.

Sumbitted by:	kan
2007-04-23 03:24:33 +00:00

184 lines
4.7 KiB
Awk

#
# Copyright (C) 2006 Daniel M. Eischen. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#
#
# Make a list of all the library versions listed in the master file.
#
# versions[] - array indexed by version name, contains number
# of symbols (+ 1) found for each version.
# successors[] - array index by version name, contains successor
# version name.
# symbols[][] - array index by [version name, symbol index], contains
# names of symbols defined for each version.
#
BEGIN {
brackets = 0;
errors = 0;
version_count = 0;
current_version = "";
stderr = "/dev/stderr";
while (getline < vfile) {
# Strip comments.
sub("#.*$", "", $0);
# Strip trailing spaces.
sub(" *$", "", $0);
if (/^[ \t]*[a-zA-Z0-9._]+ *{/) {
brackets++;
symver = $1;
versions[symver] = 1;
successors[symver] = "";
generated[symver] = 0;
version_count++;
}
else if (/^[ \t]*} *[a-zA-Z0-9._]+ *;/) {
# Strip semicolon.
gsub(";", "", $2);
if (symver == "")
printf("Unmatched bracket.\n");
else if (versions[$2] != 1)
printf("File %s: %s has unknown " \
"successor %s\n", vfile, symver, $2);
else
successors[symver] = $2;
brackets--;
}
else if (/^[ \t]*};/) {
if (symver == "")
printf("File %s: Unmatched bracket.\n",
vfile) > stderr;
# No successor
brackets--;
}
else if (/^[ \t]*}/) {
printf("File %s: Missing ending semi-colon.\n",
vfile) > stderr;
}
else if (/^$/)
; # Ignore blank lines.
else
printf("File %s: Unknown directive: %s\n",
vfile, $0) > stderr;
}
brackets = 0;
}
/.*/ {
# Delete comments, preceding and trailing whitespace, then
# consume blank lines.
sub("#.*$", "", $0);
sub("^[ \t]+", "", $0);
sub("[ \t]+$", "", $0);
if ($0 == "")
next;
}
/^[a-zA-Z0-9._]+ +{$/ {
# Strip bracket from version name.
sub("{", "", $1);
if (current_version != "")
printf("File %s, line %d: Illegal nesting detected.\n",
FILENAME, FNR) > stderr;
else if (versions[$1] == 0) {
printf("File %s, line %d: Undefined " \
"library version %s\n", FILENAME, FNR, $1) > stderr;
# Remove this entry from the versions.
delete versions[$1];
}
else
current_version = $1;
brackets++;
next;
}
/^[a-zA-Z0-9._]+ *;$/ {
if (current_version != "") {
count = versions[current_version];
versions[current_version]++;
symbols[current_version, count] = $1;
}
next;
}
/^} *;$/ {
brackets--;
if (brackets < 0) {
printf("File %s, line %d: Unmatched bracket.\n",
FILENAME, FNR, $1) > stderr;
brackets = 0; # Reset
}
current_version = "";
next;
}
/.*/ {
printf("File %s, line %d: Unknown directive: '%s'\n",
FILENAME, FNR, $0) > stderr;
}
function print_version(v)
{
# This function is recursive, so return if this version
# has already been printed. Otherwise, if there is an
# ancestral version, recursively print its symbols before
# printing the symbols for this version.
#
if (generated[v] == 1)
return;
if (successors[v] != "")
print_version(successors[v]);
printf("%s {\n", v);
# The version count is always one more that actual,
# so the loop ranges from 1 to n-1.
#
for (i = 1; i < versions[v]; i++) {
if (i == 1)
printf("global:\n");
printf("\t%s\n", symbols[v, i]);
}
if (successors[v] == "") {
# This version succeeds no other version.
printf("local:\n");
printf("\t*;\n");
printf("};\n");
}
else
printf("} %s;\n", successors[v]);
printf("\n");
generated[v] = 1;
}
END {
for (v in versions) {
print_version(v);
}
}