FreeBSD/Linux Kernel Cross Reference
sys/kern/genoffset.sh

     #!/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()
    (
        local last off x1 x2 x3 struct field type lastoff lasttype
    
        echo "#ifndef _OFFSET_INC_"
        echo "#define _OFFSET_INC_"
        echo "#if !defined(GENOFFSET) && (!defined(KLD_MODULE) || defined(KLD_TIED))"
        last=
        temp=$(mktemp -d genoffset.XXXXXXXXXX)
        trap "rm -rf ${temp}" EXIT
        # Note: we need to print symbol values in decimal so the numeric sort works
        ${NM:='nm'} ${NMFLAGS} -t d "$1" | grep __assym_offset__ | sed -e 's/__/ /g' | sort -k 4 -k 1 -n |
        while read off x1 x2 struct field type x3; do
            off=$(echo "$off" | sed -E 's/^0+//')
            if [ "$last" != "$struct" ]; then
                if [ -n "$last" ]; then
                    echo "};"
                fi
                echo "struct ${struct}_lite {"
                last=$struct
                printf "%b" "\tu_char\tpad_${field}[${off}];\n"
            else
                printf "%b" "\tu_char\tpad_${field}[${off} - (${lastoff} + sizeof(${lasttype}))];\n"
            fi
            printf "%b" "\t${type}\t${field};\n"
            lastoff="$off"
            lasttype="$type"
            echo "_SA(${struct}, ${field}, ${off});" >> "$temp/asserts"
        done
        echo "};"
        echo "#define _SA(s,f,o) _Static_assert(__builtin_offsetof(struct s ## _lite, f) == o, \\"
        printf '\t"struct "#s"_lite field "#f" not at offset "#o)\n'
        cat "$temp/asserts"
        echo "#undef _SA"
        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
   

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