scripts/gen-as-const.awk

   1 # Script used in producing headers of assembly constants from C expressions.
   2 # The input to this script looks like:
   3 #       #cpp-directive ...
   4 #       NAME1
   5 #       NAME2 expression ...
   6 # The output of this script is C code to be run through gcc -S and then
   7 # massaged to extract the integer constant values of the given C expressions.
   8 # A line giving just a name implies an expression consisting of just that name.
   9
  10 BEGIN { started = 0 }
  11
  12 # cpp directives go straight through.
  13 /^#/ { print; next }
  14
  15 NF >= 1 && !started {
  16   if (test) {
  17     print "\n#include <stdio.h>";
  18     print "\nstatic int do_test (void)\n{\n  int bad = 0, good = 0;\n";
  19     print "#define TEST(name, source, expr) \\\n" \
  20       "  if (asconst_##name != (expr)) { ++bad;" \
  21       " fprintf (stderr, \"%s: %s is %ld but %s is %ld\\n\"," \
  22       " source, #name, (long int) asconst_##name, #expr, (long int) (expr));" \
  23       " } else ++good;\n";
  24   }
  25   else
  26     print "void dummy(void) {";
  27   started = 1;
  28 }
  29
  30 # Separator.
  31 $1 == "--" { next }
  32
  33 NF == 1 { sub(/^.*$/, "& &"); }
  34
  35 NF > 1 {
  36   name = $1;
  37   sub(/^[^      ]+[     ]+/, "");
  38   if (test)
  39     print "  TEST (" name ", \"" FILENAME ":" FNR "\", " $0 ")";
  40   else
  41     printf "asm (\"@@@name@@@%s@@@value@@@%%0@@@end@@@\" : : \"i\" (%s));\n",
  42       name, $0;
  43 }
  44
  45 END {
  46   if (test) {
  47     print "  printf (\"%d errors in %d tests\\n\", bad, good + bad);"
  48     print "  return bad != 0 || good == 0;\n}\n";
  49     print "#define TEST_FUNCTION do_test ()";
  50   }
  51   else if (started) print "}";
  52 }