5d8f8ab1eb
Linux fails to build now because the mkdtemp in the bootstrapped
environment wants 6 or more X's. Use 10 out of an abundance of caution.
Sponsored by: Netflix
Reviewed by: arichards
Differential Revision: https://reviews.freebsd.org/D31863
(cherry picked from commit ecfbb2e302)
101 lines
3.0 KiB
Bash
101 lines
3.0 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#
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# Copyright (c) 2000, Bruce Evans <bde@freebsd.org>
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# Copyright (c) 2018, Jeff Roberson <jeff@freebsd.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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usage()
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{
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echo "usage: genoffset [-o outfile] objfile"
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exit 1
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}
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work()
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(
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local last off x1 x2 x3 struct field type lastoff lasttype
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echo "#ifndef _OFFSET_INC_"
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echo "#define _OFFSET_INC_"
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echo "#if !defined(GENOFFSET) && (!defined(KLD_MODULE) || defined(KLD_TIED))"
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last=
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temp=$(mktemp -d genoffset.XXXXXXXXXX)
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trap "rm -rf ${temp}" EXIT
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# Note: we need to print symbol values in decimal so the numeric sort works
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${NM:='nm'} ${NMFLAGS} -t d "$1" | grep __assym_offset__ | sed -e 's/__/ /g' | sort -k 4 -k 1 -n |
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while read off x1 x2 struct field type x3; do
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off=$(echo "$off" | sed -E 's/^0+//')
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if [ "$last" != "$struct" ]; then
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if [ -n "$last" ]; then
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echo "};"
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fi
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echo "struct ${struct}_lite {"
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last=$struct
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printf "%b" "\tu_char\tpad_${field}[${off}];\n"
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else
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printf "%b" "\tu_char\tpad_${field}[${off} - (${lastoff} + sizeof(${lasttype}))];\n"
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fi
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printf "%b" "\t${type}\t${field};\n"
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lastoff="$off"
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lasttype="$type"
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echo "_SA(${struct}, ${field}, ${off});" >> "$temp/asserts"
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done
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echo "};"
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echo "#define _SA(s,f,o) _Static_assert(__builtin_offsetof(struct s ## _lite, f) == o, \\"
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printf '\t"struct "#s"_lite field "#f" not at offset "#o)\n'
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cat "$temp/asserts"
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echo "#undef _SA"
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echo "#endif"
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echo "#endif"
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)
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#
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#MAIN PROGGRAM
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#
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use_outfile="no"
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while getopts "o:" option
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do
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case "$option" in
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o) outfile="$OPTARG"
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use_outfile="yes";;
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*) usage;;
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esac
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done
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shift $((OPTIND - 1))
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case $# in
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1) ;;
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*) usage;;
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esac
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if [ "$use_outfile" = "yes" ]
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then
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work "$1" 3>"$outfile" >&3 3>&-
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else
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work "$1"
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fi
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