sqlite/mkopcodec.awk

#!/usr/bin/awk -f
#
# This AWK script scans the opcodes.h file (which is itself generated by
# another awk script) and uses the information gleaned to create the
# opcodes.c source file.
#
# Opcodes.c contains strings which are the symbolic names for the various
# opcodes used by the VDBE.  These strings are used when disassembling a
# VDBE program during tracing or as a result of the EXPLAIN keyword.
#
BEGIN {
  print "/* Automatically generated.  Do not edit */"
  print "/* See the mkopcodec.awk script for details. */"
  printf "#if !defined(SQLITE_OMIT_EXPLAIN)"
  printf    " || !defined(NDEBUG)"
  printf    " || defined(VDBE_PROFILE)"
  print     " || defined(SQLITE_DEBUG)"
  print "const char *sqlite3OpcodeName(int i){"
  print " static const char *const azName[] = { \"?\","
  mx = 0
}
/define OP_/ {
  sub("OP_","",$2)
  i = $3+0
  label[i] = $2
  if( mx<i ) mx = i
}
END {
  for(i=1; i<=mx; i++){
    printf "     /* %3d */ \"%s\",\n", i, label[i]
  }
  print "  };"
  print "  return azName[i];"
  print "}"
  print "#endif"
}