generator.py 文件源码

def code_gen_extract_sub_runs_old(sub_runs, vname, start_clean = True):
   """Write code that assigns bits to vname based on the sub runs.  If
   start_clean is false, we OR in our first stuff. Otherwise we do an
   assignment for the very first bits extracted."""

   # position is the position of the start of the bit run, treated as
   # a string, so shifts must be adjusted for the width of the run.

   eol  = ';\n'
   nl  = '\n'
   if start_clean:
      first = True
   else:
      first = False
   s = ''

   for (bit,count,position_str, nonterminal_addr) in sub_runs:
      print("PROCESSING SUBRUN (%s, %d, %s, %s)" % (
          bit, count ,position_str, nonterminal_addr))
      # control whether or not we do an assignment or and |= in to our
      # dest var c.
      if first:
         bar = ''
         first = False
      else:
         bar = '|'
         # must shift last "c" by the amount we are or-ing in on this iteration
         t += "%s=%s<<%s%s" % (vname, vname, str(count), eol)
         s += t
         print("ADDING SHIFT OF PREV STUFF: %s" % t)

      sindex =  str(position_str)
      if nonterminal_addr != '':
         sindex += nonterminal_addr
      sindex  += '+xed_decoded_inst_nonterminal_bitpos_start(xds)'
      s += "%s %s=xed_decoded_inst_read_any_bits(xds,%s,%s)%s" % (
          vname, bar, sindex, str(count), eol )
   return s