src/openpower/decoder/pseudo/pywriter.py

   1 # python code-writer for OpenPOWER ISA pseudo-code parsing
   2
   3 import os
   4 import sys
   5 import shutil
   6 import subprocess
   7 from openpower.decoder.pseudo.pagereader import ISA
   8 from openpower.decoder.power_pseudo import convert_to_python
   9 from openpower.decoder.orderedset import OrderedSet
  10 from openpower.decoder.isa.caller import create_args
  11
  12
  13 def get_isasrc_dir():
  14     fdir = os.path.abspath(os.path.dirname(__file__))
  15     fdir = os.path.split(fdir)[0]
  16     return os.path.join(fdir, "isa")
  17
  18
  19 header = """\
  20 # auto-generated by pywriter.py, do not edit or commit
  21
  22 from openpower.decoder.isa.caller import inject, instruction_info
  23 from openpower.decoder.helpers import (EXTS, EXTS64, EXTZ64, ROTL64, ROTL32,
  24                                  MASK, MASK32,
  25                                  ne, eq, gt, ge, lt, le, ltu, gtu, length,
  26                                  trunc_divs, trunc_rems, MULS, DIVS, MODS,
  27                                  EXTS128, undefined,
  28                                  DOUBLE, SINGLE,
  29                                  FPADD32, FPSUB32, FPMUL32, FPDIV32,
  30                                  FPADD64, FPSUB64, FPMUL64, FPDIV64,
  31                                 )
  32 from openpower.decoder.selectable_int import SelectableInt
  33 from openpower.decoder.selectable_int import selectconcat as concat
  34 from openpower.decoder.orderedset import OrderedSet
  35
  36 """
  37
  38 fpheader = """
  39 from openpower.decoder.helpers import (
  40                                  DOUBLE, SINGLE,
  41                                  FPADD32, FPSUB32, FPMUL32, FPDIV32,
  42                                  FPADD64, FPSUB64, FPMUL64, FPDIV64,
  43                                  FPMULADD32,
  44                                 )
  45 from openpower.decoder.isafunctions.fpfromint import INT2FP
  46
  47
  48 """
  49
  50 iinfo_template = """instruction_info(func=%s,
  51                 read_regs=%s,
  52                 uninit_regs=%s, write_regs=%s,
  53                 special_regs=%s, op_fields=%s,
  54                 form='%s',
  55                 asmregs=%s)"""
  56
  57
  58 class PyISAWriter(ISA):
  59     def __init__(self):
  60         ISA.__init__(self)
  61         self.pages_written = []
  62
  63     def write_pysource(self, pagename):
  64         self.pages_written.append(pagename)
  65         instrs = self.page[pagename]
  66         isadir = get_isasrc_dir()
  67         fname = os.path.join(isadir, "%s.py" % pagename)
  68         with open(fname, "w") as f:
  69             iinf = ''
  70             # write headers: FP gets extra imports
  71             f.write(header)  # write out header
  72             if pagename.startswith("fp"):
  73                 f.write(fpheader)
  74             f.write("class %s:\n" % pagename)
  75
  76             # go through all instructions
  77             for page in instrs:
  78                 d = self.instr[page]
  79                 print("page", pagename, page, fname, d.opcode)
  80                 pcode = '\n'.join(d.pcode) + '\n'
  81                 print(pcode)
  82                 incl_carry = pagename == 'fixedshift'
  83                 pycode, rused = convert_to_python(pcode, d.form, incl_carry)
  84                 # create list of arguments to call
  85                 regs = list(rused['read_regs']) + list(rused['uninit_regs'])
  86                 regs += list(rused['special_regs'])
  87                 args = ', '.join(create_args(regs, 'self'))
  88                 # create list of arguments to return
  89                 retargs = ', '.join(create_args(rused['write_regs']))
  90                 # write out function.  pre-pend "op_" because some instrs are
  91                 # also python keywords (cmp).  also replace "." with "_"
  92                 op_fname = "op_%s" % page.replace(".", "_")
  93                 f.write("    @inject()\n")
  94                 f.write("    def %s(%s):\n" % (op_fname, args))
  95                 if 'NIA' in pycode:  # HACK - TODO fix
  96                     f.write("        global NIA\n")
  97                 pycode = pycode.split("\n")
  98                 pycode = '\n'.join(map(lambda x: "        %s" % x, pycode))
  99                 pycode = pycode.rstrip()
 100                 f.write(pycode + '\n')
 101                 if retargs:
 102                     f.write("        return (%s,)\n\n" % retargs)
 103                 else:
 104                     f.write("\n")
 105                 # accumulate the instruction info
 106                 ops = repr(rused['op_fields'])
 107                 iinfo = iinfo_template % (op_fname, rused['read_regs'],
 108                                           rused['uninit_regs'],
 109                                           rused['write_regs'],
 110                                           rused['special_regs'],
 111                                           ops, d.form, d.regs)
 112                 iinf += "    %s_instrs['%s'] = %s\n" % (pagename, page, iinfo)
 113             # write out initialisation of info, for ISACaller to use
 114             f.write("    %s_instrs = {}\n" % pagename)
 115             f.write(iinf)
 116
 117     def patch_if_needed(self, source):
 118         isadir = get_isasrc_dir()
 119         fname = os.path.join(isadir, "%s.py" % source)
 120         patchname = os.path.join(isadir, "%s.patch" % source)
 121
 122         try:
 123             with open(patchname, 'r') as patch:
 124                 newfname = fname + '.orig'
 125                 shutil.copyfile(fname, newfname)
 126                 subprocess.check_call(['patch', fname],
 127                                       stdin=patch)
 128         except:
 129             pass
 130
 131     def write_isa_class(self):
 132         isadir = get_isasrc_dir()
 133         fname = os.path.join(isadir, "all.py")
 134
 135         with open(fname, "w") as f:
 136             f.write('# auto-generated by pywriter.py: do not edit or commit\n')
 137             f.write('from openpower.decoder.isa.caller import ISACaller\n')
 138             for page in self.pages_written:
 139                 f.write('from openpower.decoder.isa.%s ' \
 140                         'import %s\n' % (page, page))
 141             f.write('\n')
 142
 143             classes = ', '.join(['ISACaller'] + self.pages_written)
 144             f.write('class ISA(%s):\n' % classes)
 145             f.write('    def __init__(self, *args, **kwargs):\n')
 146             f.write('        super().__init__(*args, **kwargs)\n')
 147             f.write('        self.instrs = {\n')
 148             for page in self.pages_written:
 149                 f.write('            **self.%s_instrs,\n' % page)
 150             f.write('        }\n')
 151
 152
 153 def pywriter():
 154     isa = PyISAWriter()
 155     write_isa_class = True
 156     if len(sys.argv) == 1:  # quick way to do it
 157         print(dir(isa))
 158         sources = isa.page.keys()
 159     else:
 160         sources = sys.argv[1:]
 161         if sources[0] == "noall": # don't rewrite all.py
 162             write_isa_class = False
 163             sources.pop(0)
 164     print ("sources", write_isa_class, sources)
 165     for source in sources:
 166         isa.write_pysource(source)
 167         isa.patch_if_needed(source)
 168     if write_isa_class:
 169         isa.write_isa_class()
 170
 171 if __name__ == '__main__':
 172     pywriter()