The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 #       $NetBSD: genassym.sh,v 1.12 2002/11/17 19:24:50 chs Exp $
    2 
    3 #
    4 # Copyright (c) 1997 Matthias Pfaller.
    5 # All rights reserved.
    6 #
    7 # Redistribution and use in source and binary forms, with or without
    8 # modification, are permitted provided that the following conditions
    9 # are met:
   10 # 1. Redistributions of source code must retain the above copyright
   11 #    notice, this list of conditions and the following disclaimer.
   12 # 2. Redistributions in binary form must reproduce the above copyright
   13 #    notice, this list of conditions and the following disclaimer in the
   14 #    documentation and/or other materials provided with the distribution.
   15 # 3. All advertising materials mentioning features or use of this software
   16 #    must display the following acknowledgement:
   17 #       This product includes software developed by Matthias Pfaller.
   18 # 4. The name of the author may not be used to endorse or promote products
   19 #    derived from this software without specific prior written permission
   20 #
   21 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31 #
   32 
   33 # If first argument is -c, create a temporary C file,
   34 # compile it and execute the result.
   35 
   36 awk=${AWK:-awk}
   37 
   38 if [ "$1" = '-c' ] ; then
   39         shift
   40         ccode=1
   41 else
   42         ccode=0
   43 fi
   44 
   45 # Deal with any leading environment settings..
   46 
   47 while [ "$1" ]
   48 do
   49         case "$1" in
   50         *=*)
   51                 eval export "$1"
   52                 shift
   53                 ;;
   54         *)      
   55                 break
   56                 ;;
   57         esac
   58 done
   59 
   60 trap "rm -f /tmp/$$.c /tmp/genassym.$$" 0 1 2 3 15
   61 
   62 $awk '
   63 BEGIN {
   64         printf("#ifndef _KERNEL\n#define _KERNEL\n#endif\n");
   65         printf("#define offsetof(type, member) ((size_t)(&((type *)0)->member))\n");
   66         defining = 0;
   67         type = "long";
   68         asmtype = "n";
   69         asmprint = "";
   70 }
   71 
   72 $0 ~ /^[ \t]*#.*/ || $0 ~ /^[ \t]*$/ {
   73         # Just ignore comments and empty lines
   74         next;
   75 }
   76 
   77 $0 ~ /^config[ \t]/ {
   78         type = $2;
   79         asmtype = $3;
   80         asmprint = $4;
   81         next;
   82 }
   83 
   84 /^include[ \t]/ {
   85         if (defining != 0) {
   86                 defining = 0;
   87                 printf("}\n");
   88         }
   89         printf("#%s\n", $0);
   90         next;
   91 }
   92 
   93 $0 ~ /^if[ \t]/ ||
   94 $0 ~ /^ifdef[ \t]/ ||
   95 $0 ~ /^ifndef[ \t]/ ||
   96 $0 ~ /^else/ ||
   97 $0 ~ /^elif[ \t]/ ||
   98 $0 ~ /^endif/ {
   99         printf("#%s\n", $0);
  100         next;
  101 }
  102 
  103 /^struct[ \t]/ {
  104         structname = $2;
  105         $0 = "define " structname "_SIZEOF sizeof(struct " structname ")";
  106         # fall through
  107 }
  108 
  109 /^member[ \t]/ {
  110         if (NF > 2)
  111                 $0 = "define " $2 " offsetof(struct " structname ", " $3 ")";
  112         else
  113                 $0 = "define " $2 " offsetof(struct " structname ", " $2 ")";
  114         # fall through
  115 }
  116 
  117 /^export[ \t]/ {
  118         $0 = "define " $2 " " $2;
  119         # fall through
  120 }
  121 
  122 /^define[ \t]/ {
  123         if (defining == 0) {
  124                 defining = 1;
  125                 printf("void f" FNR "(void);\n");
  126                 printf("void f" FNR "() {\n");
  127                 if (ccode)
  128                         call[FNR] = "f" FNR;
  129                 defining = 1;
  130         }
  131         value = $0
  132         gsub("^define[ \t]+[A-Za-z_][A-Za-z_0-9]*[ \t]+", "", value)
  133         if (ccode)
  134                 printf("printf(\"#define " $2 " %%ld\\n\", (%s)" value ");\n", type);
  135         else
  136                 printf("__asm(\"XYZZY %s %%%s0\" : : \"%s\" (%s));\n", $2, asmprint, asmtype, value);
  137         next;
  138 }
  139 
  140 /^quote[ \t]/ {
  141         gsub("^quote[ \t]+", "");
  142         print;
  143         next;
  144 }
  145 
  146 {
  147         printf("syntax error in line %d\n", FNR) >"/dev/stderr";
  148         exit(1);
  149 }
  150 
  151 END {
  152         if (defining != 0) {
  153                 defining = 0;
  154                 printf("}\n");
  155         }
  156         if (ccode) {
  157                 printf("int main(int argc, char **argv) {");
  158                 for (i in call)
  159                         printf(call[i] "();");
  160                 printf("return(0); }\n");
  161         }
  162 }
  163 ' ccode=$ccode > /tmp/$$.c || exit 1
  164 
  165 if [ $ccode = 1 ] ; then
  166         "$@" /tmp/$$.c -o /tmp/genassym.$$ && /tmp/genassym.$$
  167 else
  168         # Kill all of the "#" and "$" modifiers; locore.s already
  169         # prepends the correct "constant" modifier.
  170         "$@" -S /tmp/$$.c -o - > /tmp/genassym.$$ && \
  171             sed -e 's/#//g' -e 's/\$//g' < /tmp/genassym.$$ | \
  172             sed -n 's/.*XYZZY/#define/gp'
  173 fi

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