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     def debugInfo(self):
  47         return "Assignment:"+str(self.left) + " "+str(self.op)+" "+str(self.right)
  48
  49
  50 class CondStatement:
  51     def __init__(self, cond, ifpart, elsepart):
  52         self.cond = cond
  53         self.ifpart = ifpart
  54         self.elsepart = elsepart
  55
  56
  57 class Absyn:
  58     def __init__(self, outputfn):
  59         self.outputfn = outputfn
  60         self.outputfile = None
  61         self.assign = []
  62         self.ports = []
  63         self.wires = []
  64         self.comb = []
  65
  66     def open(self):
  67         if(self.outputfile is None):
  68             self.outputfile = open(self.outputfn, "w")
  69             self.outputfile.write(preamble)
  70
  71     def printpy(self, p):
  72         self.open()
  73         self.outputfile.write(str(p)+"\n")
  74
  75     def assign(self, p):
  76         p = list(p)
  77         if(p[1] == "assign"):
  78             self.printpy(p[4])
  79
  80     def assign3(self, left, op, right):
  81         return Assignment(left, op, right)
  82
  83     def cond_statement3(self, cond, ifpart, elsepart):
  84         return CondStatement(cond, ifpart, elsepart)
  85
  86     def indent(self, count):
  87         if(indent_debug):
  88             return Leaf(token.INDENT, '>>> '*count)
  89         else:
  90             return Leaf(token.INDENT, ' '*4*count)
  91
  92     def dedent(self, count):
  93         return Leaf(token.DEDENT, '')
  94
  95     def nl(self):
  96         return Leaf(token.NEWLINE, '\n')
  97
  98     def port_decl(self, comment, dt, name):
  99         port = PortDecl(comment, dt, name)
 100         self.ports += [port]
 101         return port
 102
 103     def isPort(self, name):
 104         for p in self.ports:
 105             if(str(p.name) == str(name)):
 106                 return True
 107         return False
 108
 109     def initFunc(self, ports, params):
 110         params = [Leaf(token.LPAR, '('), Leaf(
 111             token.NAME, "self")] + [Leaf(token.RPAR, ')')]
 112         # TODO handle sv params
 113         fn = [Leaf(token.NAME, 'def'),
 114               Leaf(token.NAME, '__init__', prefix=' '),
 115               Node(syms.parameters, params),
 116               Leaf(token.COLON, ':'),
 117               self.nl()
 118               ]
 119         fndef = Node(syms.funcdef, fn)
 120         stmts = Node(syms.stmt, [fndef])
 121         for port in ports:
 122             stmts.children.append(self.indent(2))
 123             stmts.children.append(port.initNode())
 124             stmts.children.append(self.nl())
 125         return stmts
 126
 127     def do_assign(self, a, stmts, indent):
 128         stmts.children.append(self.indent(indent))
 129         stmts.children.append(Leaf(token.STRING, "m.d.comb += "))
 130         if(self.isPort(a.left)):
 131             stmts.children.append(Leaf(token.STRING, "self."))
 132         stmts.children.append(Leaf(token.STRING, a.left))
 133         stmts.children.append(Leaf(token.STRING, ".eq("))
 134         if(self.isPort(a.right)):
 135             stmts.children.append(Leaf(token.STRING, "self."))
 136         stmts.children.append(Leaf(token.STRING, a.right))
 137         stmts.children.append(Leaf(token.STRING, ")"))
 138         stmts.children.append(self.nl())
 139
 140     def do_ifblock(self, c, stmts, indent):
 141         stmts.children.append(self.indent(indent))
 142         stmts.children.append(Leaf(token.STRING, "with m.If("))
 143         if(self.isPort(c.cond)):
 144             stmts.children.append(Leaf(token.STRING, "self."))
 145         stmts.children.append(Leaf(token.STRING, c.cond))
 146         stmts.children.append(Leaf(token.STRING, "):"))
 147         stmts.children.append(self.nl())
 148
 149         for c1 in c.ifpart.statements:
 150             if(type(c1) == Assignment):
 151                 self.do_assign(c1, stmts, indent+1)
 152             else:
 153                 self.do_ifblock(c1, stmts, indent+1)
 154
 155         if(c.elsepart):
 156             stmts.children.append(self.indent(indent))
 157             stmts.children.append(Leaf(token.STRING, "with m.Else():"))
 158             stmts.children.append(self.nl())
 159
 160             for c1 in c.elsepart.statements:
 161                 if(type(c1) == Assignment):
 162                     self.do_assign(c1, stmts, indent+1)
 163                 else:
 164                     self.do_ifblock(c1, stmts, indent+1)
 165
 166     def elaborateFunc(self):
 167         params = [Leaf(token.LPAR, '('), Leaf(
 168             token.NAME, "self, platform=None"), Leaf(token.RPAR, ')')]
 169         fn = [Leaf(token.NAME, 'def'),
 170               Leaf(token.NAME, 'elaborate', prefix=' '),
 171               Node(syms.parameters, params),
 172               Leaf(token.COLON, ':'),
 173               self.nl()
 174               ]
 175         fndef = Node(syms.funcdef, fn)
 176         stmts = Node(syms.stmt, [fndef])
 177         stmts.children.append(self.indent(2))
 178         stmts.children.append(Leaf(token.STRING, "m = Module()"))
 179         stmts.children.append(self.nl())
 180
 181         for w in self.wires:
 182             wirename = w[0]
 183             hasdims = (len(w) >= 4)
 184             stmts.children.append(self.indent(2))
 185             stmts.children.append(Leaf(token.STRING, wirename))
 186             stmts.children.append(Leaf(token.STRING, " = Signal("))
 187             if(hasdims):
 188                 stmts.children.append(Leaf(token.STRING, str(w[3])))
 189             stmts.children.append(Leaf(token.STRING, ")"))
 190             stmts.children.append(self.nl())
 191
 192         # refactor: assignments non cond
 193         for a in self.assign:
 194             self.do_assign(a, stmts)
 195
 196         for c in self.comb:
 197             print("comb", c)
 198             if(type(c) == Assignment):
 199                 self.do_assign(c, stmts, 2)
 200             else:
 201                 self.do_ifblock(c, stmts, 2)
 202
 203         stmts.children.append(self.indent(2))
 204         stmts.children.append(Leaf(token.STRING, "return m"))
 205         stmts.children.append(self.nl())
 206         return stmts
 207
 208     def module_1(self, p):
 209         params = p[7]
 210         ports = p[8]
 211         clsname = [Leaf(token.NAME, 'class'),
 212                    Leaf(token.NAME, p[4], prefix=' '),
 213                    Leaf(token.LPAR, '('),
 214                    Leaf(token.NAME, 'Elaboratable'),
 215                    Leaf(token.LPAR, ')'),
 216                    Leaf(token.COLON, ':'),
 217                    self.nl(),
 218                    ]
 219
 220         suite = Node(syms.suite, [Leaf(token.NEWLINE, '\n'),
 221                                   self.indent(1),
 222                                   self.initFunc(ports, params),
 223                                   self.indent(1),
 224                                   self.elaborateFunc()
 225
 226                                   ])
 227         clsdecl = Node(syms.classdef, clsname + [suite])
 228         clsdecl = Node(syms.compound_stmt, [clsdecl])
 229
 230         self.printpy(str(clsdecl))
 231         return clsdecl
 232
 233     def module_item_2(self, signaltype, dims, mlist):
 234         if(signaltype == "wire"):
 235             for m in mlist:
 236                 if(dims):
 237                     self.wires.append(m+dims)
 238                 else:
 239                     self.wires.append(m)
 240
 241     def appendComments(self, data):
 242         self.open()
 243         self.outputfile.write(data)
 244         #lines = data.split("\n")
 245         # for line in lines:
 246         #    self.printpy("#"+line)
 247
 248     # combinatorical assign
 249     def cont_assign_1(self, p):
 250         self.assign += [Assignment(p[1], p[2], p[3])]
 251
 252     # cond assigmments and other nested blocks
 253     def always_comb(self, p3, p1):
 254         print("always_comb")
 255         slist = p3[6]
 256         self.comb += slist.statements