src/soc/decoder/pseudo/pywriter.py

   1 # python code-writer for OpenPOWER ISA pseudo-code parsing
   2
   3 import os
   4 from soc.decoder.pseudo.pagereader import ISA
   5 from soc.decoder.power_pseudo import convert_to_python
   6
   7 def get_isasrc_dir():
   8     fdir = os.path.abspath(os.path.dirname(__file__))
   9     fdir = os.path.split(fdir)[0]
  10     return os.path.join(fdir, "isa")
  11
  12 def create_args(reglist, extra=None):
  13     args = set()
  14     for reg in reglist:
  15         args.add(reg)
  16     args = list(args)
  17     if extra:
  18         args = [extra] + args
  19     return ', '.join(args)
  20
  21
  22 class PyISAWriter(ISA):
  23     def __init__(self):
  24         ISA.__init__(self)
  25
  26     def write_pysource(self, pagename):
  27         instrs = isa.page[pagename]
  28         isadir = get_isasrc_dir()
  29         fname = os.path.join(isadir, "%s.py" % pagename)
  30         with open(fname, "w") as f:
  31             iinf = ''
  32             f.write("# auto-generated by pywriter.py, do not edit or commit\n")
  33             f.write("from soc.decoder.isa import ISACaller\n\n")
  34             f.write("from soc.decoder.helpers import " + \
  35                     "(EXTS64, EXTZ64, ROTL64, ROTL32, MASK,)\n")
  36
  37             f.write("class %s(ISACaller):\n" % pagename)
  38             for page in instrs:
  39                 d = self.instr[page]
  40                 print (fname, d.opcode)
  41                 pcode = '\n'.join(d.pcode) + '\n'
  42                 print (pcode)
  43                 pycode, rused = convert_to_python(pcode)
  44                 # create list of arguments to call
  45                 regs = rused['read_regs'] + rused['uninit_regs']
  46                 args = create_args(regs, 'self')
  47                 # create list of arguments to return
  48                 retargs = create_args(rused['write_regs'])
  49                 f.write("    def %s(%s):\n" % (page.replace(".", "_"), args))
  50                 pycode = pycode.split("\n")
  51                 pycode = '\n'.join(map(lambda x: "        %s" % x, pycode))
  52                 pycode = pycode.rstrip()
  53                 f.write(pycode + '\n')
  54                 if retargs:
  55                     f.write("        return (%s,)\n\n" % retargs)
  56                 else:
  57                     f.write("\n")
  58                 # cumulate the instruction info
  59                 iinfo = "(%s, %s, %s, %s)" % \
  60                             (pagename, rused['read_regs'],
  61                             rused['uninit_regs'], rused['write_regs'])
  62                 iinf += "    instrs['%s'] = %s\n" % (pagename, iinfo)
  63             f.write("    instrs = {}\n")
  64             f.write(iinf)
  65
  66 if __name__ == '__main__':
  67     isa = PyISAWriter()
  68     isa.write_pysource('comparefixed')
  69     isa.write_pysource('fixedarith')