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 header = """\
  22 # auto-generated by pywriter.py, do not edit or commit
  23
  24 from soc.decoder.isa import ISACaller
  25 from soc.decoder.helpers import (EXTS64, EXTZ64, ROTL64, ROTL32, MASK,)
  26 from soc.decoder.selectable_int import SelectableInt
  27 from soc.decoder.selectable_int import selectconcat as concat
  28
  29 class %s(ISACaller):
  30
  31 """
  32
  33 class PyISAWriter(ISA):
  34     def __init__(self):
  35         ISA.__init__(self)
  36
  37     def write_pysource(self, pagename):
  38         instrs = isa.page[pagename]
  39         isadir = get_isasrc_dir()
  40         fname = os.path.join(isadir, "%s.py" % pagename)
  41         with open(fname, "w") as f:
  42             iinf = ''
  43             f.write(header % pagename) # write out header
  44             # go through all instructions
  45             for page in instrs:
  46                 d = self.instr[page]
  47                 print (fname, d.opcode)
  48                 pcode = '\n'.join(d.pcode) + '\n'
  49                 print (pcode)
  50                 pycode, rused = convert_to_python(pcode)
  51                 # create list of arguments to call
  52                 regs = rused['read_regs'] + rused['uninit_regs']
  53                 args = create_args(regs, 'self')
  54                 # create list of arguments to return
  55                 retargs = create_args(rused['write_regs'])
  56                 # write out function.  pre-pend "op_" because some instrs are
  57                 # also python keywords (cmp).  also replace "." with "_"
  58                 op_fname ="op_%s" % page.replace(".", "_")
  59                 f.write("    def %s(%s):\n" % (op_fname, args))
  60                 pycode = pycode.split("\n")
  61                 pycode = '\n'.join(map(lambda x: "        %s" % x, pycode))
  62                 pycode = pycode.rstrip()
  63                 f.write(pycode + '\n')
  64                 if retargs:
  65                     f.write("        return (%s,)\n\n" % retargs)
  66                 else:
  67                     f.write("\n")
  68                 # accumulate the instruction info
  69                 iinfo = "(%s, %s, %s, %s)" % \
  70                             (op_fname, rused['read_regs'],
  71                             rused['uninit_regs'], rused['write_regs'])
  72                 iinf += "    instrs['%s'] = %s\n" % (page, iinfo)
  73             # write out initialisation of info, for ISACaller to use
  74             f.write("    instrs = {}\n")
  75             f.write(iinf)
  76
  77 if __name__ == '__main__':
  78     isa = PyISAWriter()
  79     isa.write_pysource('comparefixed')
  80     isa.write_pysource('fixedarith')