#!/bin/sh
# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
#
# Copyright (c) 2000, Bruce Evans <bde@freebsd.org>
# Copyright (c) 2018, Jeff Roberson <jeff@freebsd.org>
#
# 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 THE 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 THE 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.
#
# $FreeBSD$
usage()
{
echo "usage: genoffset [-o outfile] objfile"
exit 1
}
work()
{
echo "#ifndef _OFFSET_INC_"
echo "#define _OFFSET_INC_"
echo "#if !defined(GENOFFSET) && (!defined(KLD_MODULE) || defined(KLD_TIED))"
${NM:='nm'} ${NMFLAGS} "$1" | ${AWK:='awk'} '
/ C .*_datatype_*/ {
type = substr($3, match($3, "_datatype_") + length("_datatype_"))
}
/ C .*_parenttype_*/ {
parent = substr($3, match($3, "_parenttype_") + length("_parenttype_"))
}
/ C .*sign$/ {
sign = substr($1, length($1) - 3, 4)
sub("^0*", "", sign)
if (sign != "")
sign = "-"
}
/ C .*w0$/ {
w0 = substr($1, length($1) - 3, 4)
}
/ C .*w1$/ {
w1 = substr($1, length($1) - 3, 4)
}
/ C .*w2$/ {
w2 = substr($1, length($1) - 3, 4)
}
/ C .*w3$/ {
w3 = substr($1, length($1) - 3, 4)
w = w3 w2 w1 w0
sub("^0*", "", w)
if (w == "")
w = "0"
hex = ""
if (w != "0")
hex = "0x"
sub("w3$", "", $3)
member = tolower($3)
# This still has minor problems representing INT_MIN, etc.
# E.g.,
# with 32-bit 2''s complement ints, this prints -0x80000000,
# which has the wrong type (unsigned int).
offset = sprintf("%s%s%s", sign, hex, w)
structures[parent] = sprintf("%s%s %s %s\n",
structures[parent], offset, type, member)
}
END {
for (struct in structures) {
printf("struct %s_lite {\n", struct);
n = split(structures[struct], members, "\n")
for (i = 1; i < n; i++) {
for (j = i + 1; j < n; j++) {
split(members[i], ivar, " ")
split(members[j], jvar, " ")
if (jvar[1] < ivar[1]) {
tmp = members[i]
members[i] = members[j]
members[j] = tmp
}
}
}
off = "0"
for (i = 1; i < n; i++) {
split(members[i], m, " ")
printf "\tu_char\tpad_%s[%s - %s];\n", m[3], m[1], off
printf "\t%s\t%s;\n", m[2], m[3]
off = sprintf("(%s + sizeof(%s))", m[1], m[2])
}
printf("};\n");
}
}
'
echo "#endif"
echo "#endif"
}
#
#MAIN PROGGRAM
#
use_outfile="no"
while getopts "o:" option
do
case "$option" in
o) outfile="$OPTARG"
use_outfile="yes";;
*) usage;;
esac
done
shift $(($OPTIND - 1))
case $# in
1) ;;
*) usage;;
esac
if [ "$use_outfile" = "yes" ]
then
work $1 3>"$outfile" >&3 3>&-
else
work $1
fi
