mkopcodec.awk

   1 #!/usr/bin/awk -f
   2 #
   3 # This AWK script scans the opcodes.h file (which is itself generated by
   4 # another awk script) and uses the information gleaned to create the
   5 # opcodes.c source file.
   6 #
   7 # Opcodes.c contains strings which are the symbolic names for the various
   8 # opcodes used by the VDBE.  These strings are used when disassembling a
   9 # VDBE program during tracing or as a result of the EXPLAIN keyword.
  10 #
  11 BEGIN {
  12   print "/* Automatically generated.  Do not edit */"
  13   print "/* See the mkopcodec.awk script for details. */"
  14   printf "#if !defined(SQLITE_OMIT_EXPLAIN)"
  15   printf    " || defined(VDBE_PROFILE)"
  16   print     " || defined(SQLITE_DEBUG)"
  17   print "#if defined(SQLITE_ENABLE_EXPLAIN_COMMENTS) || defined(SQLITE_DEBUG)"
  18   print "# define OpHelp(X) \"\\0\" X"
  19   print "#else"
  20   print "# define OpHelp(X)"
  21   print "#endif"
  22   print "const char *sqlite3OpcodeName(int i){"
  23   print " static const char *const azName[] = { \"?\","
  24   mx = 0
  25 }
  26 /^.define OP_/ {
  27   sub("OP_","",$2)
  28   i = $3+0
  29   label[i] = $2
  30   if( mx<i ) mx = i
  31   for(j=5; j<NF; j++) if( $j=="synopsis:" ) break
  32   if( j<NF ){
  33     j++
  34     x = $j
  35     for(j=j+1; j<NF; j++) x = x " " $j
  36     synopsis[i] = x
  37   }else{
  38     synopsis[i] = ""
  39   }
  40 }
  41 END {
  42   for(i=1; i<=mx; i++){
  43     printf "     /* %3d */ %-18s OpHelp(\"%s\"),\n", i, \
  44         "\"" label[i] "\"", synopsis[i]
  45   }
  46   print "  };"
  47   print "  return azName[i];"
  48   print "}"
  49   print "#endif"
  50 }