src/soc/decoder/pseudo/pywriter.py

   1 # python code-writer for OpenPOWER ISA pseudo-code parsing
   2
   3 import os
   4 import sys
   5 from soc.decoder.pseudo.pagereader import ISA
   6 from soc.decoder.power_pseudo import convert_to_python
   7 from soc.decoder.orderedset import OrderedSet
   8 from soc.decoder.isa.caller import create_args
   9
  10 def get_isasrc_dir():
  11     fdir = os.path.abspath(os.path.dirname(__file__))
  12     fdir = os.path.split(fdir)[0]
  13     return os.path.join(fdir, "isa")
  14
  15
  16 header = """\
  17 # auto-generated by pywriter.py, do not edit or commit
  18
  19 from soc.decoder.isa.caller import inject
  20 from soc.decoder.helpers import (EXTS, EXTS64, EXTZ64, ROTL64, ROTL32, MASK,)
  21 from soc.decoder.selectable_int import SelectableInt
  22 from soc.decoder.selectable_int import selectconcat as concat
  23 from soc.decoder.orderedset import OrderedSet
  24
  25 class %s:
  26
  27 """
  28
  29 iinfo_template = """(%s, %s,
  30                 %s, %s,
  31                 %s, '%s',
  32                 %s)"""
  33
  34 class PyISAWriter(ISA):
  35     def __init__(self):
  36         ISA.__init__(self)
  37         self.pages_written = []
  38
  39     def write_pysource(self, pagename):
  40         self.pages_written.append(pagename)
  41         instrs = isa.page[pagename]
  42         isadir = get_isasrc_dir()
  43         fname = os.path.join(isadir, "%s.py" % pagename)
  44         with open(fname, "w") as f:
  45             iinf = ''
  46             f.write(header % pagename) # write out header
  47             # go through all instructions
  48             for page in instrs:
  49                 d = self.instr[page]
  50                 print (fname, d.opcode)
  51                 pcode = '\n'.join(d.pcode) + '\n'
  52                 print (pcode)
  53                 pycode, rused = convert_to_python(pcode, d.form)
  54                 # create list of arguments to call
  55                 regs = list(rused['read_regs']) + list(rused['uninit_regs'])
  56                 args = ', '.join(create_args(regs, 'self'))
  57                 # create list of arguments to return
  58                 retargs = ', '.join(create_args(rused['write_regs']))
  59                 # write out function.  pre-pend "op_" because some instrs are
  60                 # also python keywords (cmp).  also replace "." with "_"
  61                 op_fname ="op_%s" % page.replace(".", "_")
  62                 f.write("    @inject()\n")
  63                 f.write("    def %s(%s):\n" % (op_fname, args))
  64                 pycode = pycode.split("\n")
  65                 pycode = '\n'.join(map(lambda x: "        %s" % x, pycode))
  66                 pycode = pycode.rstrip()
  67                 f.write(pycode + '\n')
  68                 if retargs:
  69                     f.write("        return (%s,)\n\n" % retargs)
  70                 else:
  71                     f.write("\n")
  72                 # accumulate the instruction info
  73                 ops = repr(rused['op_fields'])
  74                 iinfo = iinfo_template % (op_fname, rused['read_regs'],
  75                                 rused['uninit_regs'], rused['write_regs'],
  76                                 ops, d.form, d.regs)
  77                 iinf += "    %s_instrs['%s'] = %s\n" % (pagename, page, iinfo)
  78             # write out initialisation of info, for ISACaller to use
  79             f.write("    %s_instrs = {}\n" % pagename)
  80             f.write(iinf)
  81
  82     def write_isa_class(self):
  83         isadir = get_isasrc_dir()
  84         fname = os.path.join(isadir, "all.py")
  85
  86         with open(fname, "w") as f:
  87             f.write('from soc.decoder.isa.caller import ISACaller\n')
  88             for page in self.pages_written:
  89                 f.write('from soc.decoder.isa.%s import %s\n' % (page, page))
  90             f.write('\n')
  91
  92             classes = ', '.join(['ISACaller'] + self.pages_written)
  93             f.write('class ISA(%s):\n' % classes)
  94             f.write('    def __init__(self, dec, regs):\n')
  95             f.write('        super().__init__(dec, regs)\n')
  96             f.write('        self.instrs = {\n')
  97             for page in self.pages_written:
  98                 f.write('            **self.%s_instrs,\n' % page)
  99             f.write('        }\n')
 100
 101
 102
 103
 104
 105 if __name__ == '__main__':
 106     isa = PyISAWriter()
 107     if len(sys.argv) == 1: # quick way to do it
 108         print (dir(isa))
 109         sources = isa.page.keys()
 110     else:
 111         sources = sys.argv[1:]
 112     for source in sources:
 113         isa.write_pysource(source)
 114     isa.write_isa_class()