157 lines
4.2 KiB
Python
157 lines
4.2 KiB
Python
from .structure import *
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from .convtools import *
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from functools import partial
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def _printsig(ns, s):
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if s.bv.signed:
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n = "signed "
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else:
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n = ""
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if s.bv.width > 1:
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n += "[" + str(s.bv.width-1) + ":0] "
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n += ns.GetName(s)
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return n
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def _printexpr(ns, node):
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if isinstance(node, Constant):
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if node.n >= 0:
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return str(node.bv) + str(node.n)
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else:
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return "-" + str(node.bv) + str(-self.n)
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elif isinstance(node, Signal):
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return ns.GetName(node)
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elif isinstance(node, Operator):
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arity = len(node.operands)
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if arity == 1:
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r = node.op + _printexpr(ns, node.operands[0])
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elif arity == 2:
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r = _printexpr(ns, node.operands[0]) + " " + node.op + " " + _printexpr(ns, node.operands[1])
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else:
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raise TypeError
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return "(" + r + ")"
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elif isinstance(node, Slice):
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if node.start + 1 == node.stop:
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sr = "[" + str(node.start) + "]"
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else:
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sr = "[" + str(node.stop-1) + ":" + str(node.start) + "]"
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return _printexpr(ns, node.value) + sr
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elif isinstance(node, Cat):
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l = list(map(partial(_printexpr, ns), node.l))
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l.reverse()
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return "{" + ", ".join(l) + "}"
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elif isinstance(node, Replicate):
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return "{" + str(node.n) + "{" + _printexpr(ns, node.v) + "}}"
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else:
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raise TypeError
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def _printnode(ns, level, comb, node):
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if isinstance(node, Assign):
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if comb or IsVariable(node.l):
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assignment = " = "
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else:
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assignment = " <= "
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return "\t"*level + _printexpr(ns, node.l) + assignment + _printexpr(ns, node.r) + ";\n"
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elif isinstance(node, StatementList):
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return "".join(list(map(partial(_printnode, ns, level, comb), node.l)))
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elif isinstance(node, If):
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r = "\t"*level + "if (" + _printexpr(ns, node.cond) + ") begin\n"
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r += _printnode(ns, level + 1, comb, node.t)
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if node.f.l:
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r += "\t"*level + "end else begin\n"
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r += _printnode(ns, level + 1, comb, node.f)
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r += "\t"*level + "end\n"
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return r
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elif isinstance(node, Case):
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r = "\t"*level + "case (" + _printexpr(ns, node.test) + ")\n"
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for case in node.cases:
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r += "\t"*(level + 1) + _printexpr(ns, case[0]) + ": begin\n"
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r += _printnode(ns, level + 2, comb, case[1])
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r += "\t"*(level + 1) + "end\n"
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if node.default.l:
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r += "\t"*(level + 1) + "default: begin\n"
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r += _printnode(ns, level + 2, comb, node.default)
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r += "\t"*(level + 1) + "end\n"
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r += "\t"*level + "endcase\n"
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return r
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else:
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raise TypeError
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def _printinstances(ns, i, clk, rst):
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r = ""
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for x in i:
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r += x.of + " "
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if x.parameters:
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r += "#(\n"
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firstp = True
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for p in x.parameters:
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if not firstp:
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r += ",\n"
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firstp = False
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r += "\t." + p[0] + "("
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if isinstance(p[1], int):
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r += str(p[1])
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elif isinstance(p[1], basestring):
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r += "\"" + p[1] + "\""
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else:
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raise TypeError
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r += ")"
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r += "\n) "
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r += ns.GetName(x) + "(\n"
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ports = list(x.ins.items()) + list(x.outs.items())
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if x.clkport:
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ports.append((x.clkport, clk))
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if x.rstport:
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ports.append((x.rstport, rst))
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firstp = True
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for p in ports:
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if not firstp:
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r += ",\n"
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firstp = False
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r += "\t." + p[0] + "(" + ns.GetName(p[1]) + ")"
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if not firstp:
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r += "\n"
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r += ");\n\n"
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return r
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def Convert(f, ios=set(), name="top", clkname="sys_clk", rstname="sys_rst"):
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ns = Namespace()
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clks = Signal(name=clkname)
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rsts = Signal(name=rstname)
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sigs = ListSignals(f)
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targets = ListTargets(f)
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instouts = ListInstOuts(f)
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r = "/* Machine-generated using Migen */\n"
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r += "module " + name + "(\n"
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r += "\tinput " + ns.GetName(clks) + ",\n"
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r += "\tinput " + ns.GetName(rsts)
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for sig in ios:
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if sig in targets:
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r += ",\n\toutput reg " + _printsig(ns, sig)
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elif sig in instouts:
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r += ",\n\toutput " + _printsig(ns, sig)
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else:
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r += ",\n\tinput " + _printsig(ns, sig)
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r += "\n);\n\n"
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for sig in sigs - ios:
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if sig in instouts:
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r += "wire " + _printsig(ns, sig) + ";\n"
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else:
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r += "reg " + _printsig(ns, sig) + ";\n"
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r += "\n"
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if f.comb.l:
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r += "always @(*) begin\n"
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r += _printnode(ns, 1, True, f.comb)
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r += "end\n\n"
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if f.sync.l:
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r += "always @(posedge " + ns.GetName(clks) + ") begin\n"
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r += _printnode(ns, 1, False, InsertReset(rsts, f.sync))
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r += "end\n\n"
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r += _printinstances(ns, f.instances, clks, rsts)
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r += "endmodule\n"
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return r |