absyn.py

   1 from lib2to3.pytree import Node, Leaf
   2 from lib2to3.pgen2 import token
   3 from lib2to3.pygram import python_symbols as syms
   4
   5 preamble = """# this file has been generated by sv2nmigen
   6
   7 from nmigen import Signal, Module, Const, Cat, Elaboratable
   8
   9
  10
  11 """
  12
  13
  14 def port_decl_do_not_use(comment, dt, name):
  15     if dt is None or dt.dims is None:
  16         width = ''  # width: 1
  17     else:
  18         width = dt.dims
  19         # XXX TODO, better checking, should be using data structure... *sigh*
  20         width = width[1:-1]  # strip brackets
  21         width = width.split(':')
  22         assert width[0] == '0'
  23         width = width[1]
  24     return 'self.%s = Signal(%s) # %s' % (name, width, comment)
  25
  26
  27 indent_debug = 0
  28
  29
  30 class PortDecl:
  31     def __init__(self, comment, dt, name):
  32         self.comment = comment
  33         self.dt = dt
  34         self.name = name
  35
  36     def initNode(self):
  37         return port_decl_do_not_use(self.comment, self.dt, self.name)
  38
  39
  40 class Assignment:
  41     def __init__(self, left, op, right):
  42         self.left = left
  43         self.op = op
  44         self.right = right
  45
  46
  47 class Absyn:
  48     def __init__(self, outputfn):
  49         self.outputfn = outputfn
  50         self.outputfile = None
  51         self.assign = []
  52         self.ports = []
  53
  54     def open(self):
  55         if(self.outputfile is None):
  56             self.outputfile = open(self.outputfn, "w")
  57             self.outputfile.write(preamble)
  58
  59     def printpy(self, p):
  60         self.open()
  61         self.outputfile.write(str(p)+"\n")
  62
  63     def assign(self, p):
  64         p = list(p)
  65         if(p[1] == "assign"):
  66             self.printpy(p[4])
  67             # m.d.comb += [l.eq(r)]
  68
  69     def indent(self, count):
  70         if(indent_debug):
  71             return Leaf(token.INDENT, '>>> '*count)
  72         else:
  73             return Leaf(token.INDENT, ' '*4*count)
  74
  75     def dedent(self, count):
  76         return Leaf(token.DEDENT, '')
  77
  78     def nl(self):
  79         return Leaf(token.NEWLINE, '\n')
  80
  81     def port_decl(self, comment, dt, name):
  82         port = PortDecl(comment, dt, name)
  83         self.ports += [port]
  84         return port
  85
  86     def initFunc(self, ports, params):
  87         params = [Leaf(token.LPAR, '('), Leaf(
  88             token.NAME, "self")] + [Leaf(token.RPAR, ')')]
  89         # TODO handle sv params
  90         fn = [Leaf(token.NAME, 'def'),
  91               Leaf(token.NAME, '__init__', prefix=' '),
  92               Node(syms.parameters, params),
  93               Leaf(token.COLON, ':'),
  94               self.nl()
  95               ]
  96         fndef = Node(syms.funcdef, fn)
  97         stmts = Node(syms.stmt, [fndef])
  98         for port in ports:
  99             stmts.children.append(self.indent(2))
 100             stmts.children.append(port.initNode())
 101             stmts.children.append(self.nl())
 102         return stmts
 103
 104     def elaborateFunc(self):
 105         params = [Leaf(token.LPAR, '('), Leaf(
 106             token.NAME, "self, platform=None"), Leaf(token.RPAR, ')')]
 107         fn = [Leaf(token.NAME, 'def'),
 108               Leaf(token.NAME, 'elaborate', prefix=' '),
 109               Node(syms.parameters, params),
 110               Leaf(token.COLON, ':'),
 111               self.nl()
 112               ]
 113         fndef = Node(syms.funcdef, fn)
 114         stmts = Node(syms.stmt, [fndef])
 115         stmts.children.append(self.indent(2))
 116         stmts.children.append(Leaf(token.STRING, "m = Module()"))
 117         stmts.children.append(self.nl())
 118
 119         for a in self.assign:
 120             stmts.children.append(self.indent(2))
 121             # m.d.sync += self.left.eq(right)
 122             stmts.children.append(Leaf(token.STRING, "m.d.comb += self."))
 123             stmts.children.append(Leaf(token.STRING, a.left))
 124             stmts.children.append(Leaf(token.STRING, ".eq(self."))
 125             stmts.children.append(Leaf(token.STRING, a.right))
 126             stmts.children.append(Leaf(token.STRING, ")"))
 127             stmts.children.append(self.nl())
 128
 129         # for a in self.assign:
 130         #
 131             #
 132             #ports = a[8]
 133         #
 134
 135         stmts.children.append(self.indent(2))
 136         stmts.children.append(Leaf(token.STRING, "return m"))
 137         stmts.children.append(self.nl())
 138         return stmts
 139
 140     def module_1(self, p):
 141         params = p[7]
 142         ports = p[8]
 143         clsname = [Leaf(token.NAME, 'class'),
 144                    Leaf(token.NAME, p[4], prefix=' '),
 145                    Leaf(token.LPAR, '('),
 146                    Leaf(token.NAME, 'Elaboratable'),
 147                    Leaf(token.LPAR, ')'),
 148                    Leaf(token.COLON, ':'),
 149                    self.nl(),
 150                    ]
 151
 152         suite = Node(syms.suite, [Leaf(token.NEWLINE, '\n'),
 153                                   self.indent(1),
 154                                   self.initFunc(ports, params),
 155                                   self.indent(1),
 156                                   self.elaborateFunc()
 157
 158                                   ])
 159         clsdecl = Node(syms.classdef, clsname + [suite])
 160         clsdecl = Node(syms.compound_stmt, [clsdecl])
 161
 162         self.printpy(str(clsdecl))
 163         print("=====================")
 164         print(str(clsdecl))
 165         return clsdecl
 166
 167     def appendComments(self, data):
 168         self.open()
 169         self.outputfile.write(data)
 170         #lines = data.split("\n")
 171         # for line in lines:
 172         #    self.printpy("#"+line)
 173
 174     # combinatorical assign
 175     def cont_assign_1(self, p):
 176         # print("#ASSIGN:BROKEN"+str(list(p)))
 177         self.assign += [Assignment(p[1], p[2], p[3])]