297 lines
6.7 KiB
Python
297 lines
6.7 KiB
Python
import math
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import inspect
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import re
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from migen.fhdl import tracer
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def log2_int(n):
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l = 1
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r = 0
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while l < n:
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l *= 2
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r += 1
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if l == n:
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return r
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else:
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raise ValueError("Not a power of 2")
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def bits_for(n):
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if isinstance(n, Constant):
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return n.bv.width
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else:
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if n < 0:
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return bits_for(-n) + 1
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elif n == 0:
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return 1
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else:
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return int(math.ceil(math.log(n+1, 2)))
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class BV:
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def __init__(self, width=1, signed=False):
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self.width = width
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self.signed = signed
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def __repr__(self):
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r = str(self.width) + "'"
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if self.signed:
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r += "s"
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r += "d"
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return r
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def __eq__(self, other):
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return self.width == other.width and self.signed == other.signed
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class Value:
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def __invert__(self):
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return _Operator("~", [self])
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def __add__(self, other):
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return _Operator("+", [self, other])
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def __radd__(self, other):
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return _Operator("+", [other, self])
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def __sub__(self, other):
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return _Operator("-", [self, other])
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def __rsub__(self, other):
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return _Operator("-", [other, self])
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def __mul__(self, other):
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return _Operator("*", [self, other])
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def __rmul__(self, other):
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return _Operator("*", [other, self])
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def __lshift__(self, other):
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return _Operator("<<", [self, other])
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def __rlshift__(self, other):
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return _Operator("<<", [other, self])
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def __rshift__(self, other):
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return _Operator(">>", [self, other])
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def __rrshift__(self, other):
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return _Operator(">>", [other, self])
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def __and__(self, other):
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return _Operator("&", [self, other])
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def __rand__(self, other):
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return _Operator("&", [other, self])
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def __xor__(self, other):
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return _Operator("^", [self, other])
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def __rxor__(self, other):
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return _Operator("^", [other, self])
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def __or__(self, other):
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return _Operator("|", [self, other])
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def __ror__(self, other):
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return _Operator("|", [other, self])
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def __lt__(self, other):
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return _Operator("<", [self, other])
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def __le__(self, other):
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return _Operator("<=", [self, other])
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def __eq__(self, other):
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return _Operator("==", [self, other])
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def __ne__(self, other):
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return _Operator("!=", [self, other])
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def __gt__(self, other):
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return _Operator(">", [self, other])
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def __ge__(self, other):
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return _Operator(">=", [self, other])
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def __getitem__(self, key):
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if isinstance(key, int):
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return _Slice(self, key, key+1)
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elif isinstance(key, slice):
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start = key.start or 0
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stop = key.stop or self.bv.width
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if stop > self.bv.width:
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stop = self.bv.width
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if key.step != None:
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raise KeyError
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return _Slice(self, start, stop)
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else:
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raise KeyError
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def eq(self, r):
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return _Assign(self, r)
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class _Operator(Value):
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def __init__(self, op, operands):
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self.op = op
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self.operands = list(map(_cst, operands))
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class _Slice(Value):
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def __init__(self, value, start, stop):
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self.value = value
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self.start = start
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self.stop = stop
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class Cat(Value):
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def __init__(self, *args):
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self.l = list(map(_cst, args))
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class Replicate(Value):
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def __init__(self, v, n):
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self.v = _cst(v)
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self.n = n
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class Constant(Value):
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def __init__(self, n, bv=None):
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self.bv = bv or BV(bits_for(n), n < 0)
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self.n = n
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def __repr__(self):
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return str(self.bv) + str(self.n)
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def __eq__(self, other):
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return self.bv == other.bv and self.n == other.n
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def binc(x, signed=False):
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return Constant(int(x, 2), BV(len(x), signed))
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def _cst(x):
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if isinstance(x, int):
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return Constant(x)
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else:
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return x
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class Signal(Value):
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def __init__(self, bv=BV(), name=None, variable=False, reset=0, name_override=None):
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assert(isinstance(bv, BV))
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self.bv = bv
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self.variable = variable
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self.reset = Constant(reset, bv)
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self.name_override = name_override
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self.backtrace = tracer.trace_back(name)
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def __len__(self):
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return self.bv.width
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def __hash__(self):
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return id(self)
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def __repr__(self):
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return "<Signal " + (self.backtrace[-1][1] or "anonymous") + ">"
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# statements
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class _Assign:
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def __init__(self, l, r):
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self.l = l
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self.r = _cst(r)
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class _StatementList:
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def __init__(self, l=None):
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if l is None: l = []
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self.l = l
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class If:
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def __init__(self, cond, *t):
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self.cond = cond
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self.t = _StatementList(t)
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self.f = _StatementList()
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def Else(self, *f):
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_insert_else(self, _StatementList(f))
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return self
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def Elif(self, cond, *t):
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_insert_else(self, _StatementList([If(cond, *t)]))
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return self
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def _insert_else(obj, clause):
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o = obj
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while o.f.l:
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assert(len(o.f.l) == 1)
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assert(isinstance(o.f.l[0], If))
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o = o.f.l[0]
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o.f = clause
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def _sl(x):
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if isinstance(x, list):
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return _StatementList(x)
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else:
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return x
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class Default:
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pass
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class Case:
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def __init__(self, test, *cases):
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self.test = test
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self.cases = [(c[0], _StatementList(c[1:])) for c in cases if not isinstance(c[0], Default)]
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self.default = None
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for c in cases:
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if isinstance(c[0], Default):
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if self.default is not None:
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raise ValueError
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self.default = _StatementList(c[1:])
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if self.default is None:
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self.default = _StatementList()
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#
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class Instance:
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def __init__(self, of, outs=[], ins=[], inouts=[], parameters=[], clkport="", rstport="", name=""):
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self.of = of
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if name:
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self.name_override = name
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else:
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self.name_override = of
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def process_io(x):
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if isinstance(x[1], Signal):
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return x # override
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elif isinstance(x[1], BV):
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return (x[0], Signal(x[1], x[0]))
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else:
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raise TypeError
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self.outs = dict(map(process_io, outs))
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self.ins = dict(map(process_io, ins))
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self.inouts = dict(map(process_io, inouts))
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self.parameters = parameters
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self.clkport = clkport
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self.rstport = rstport
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def __hash__(self):
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return id(self)
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(READ_FIRST, WRITE_FIRST, NO_CHANGE) = range(3)
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class MemoryPort:
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def __init__(self, adr, dat_r, we=None, dat_w=None,
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async_read=False, re=None, we_granularity=0, mode=WRITE_FIRST):
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self.adr = adr
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self.dat_r = dat_r
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self.we = we
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self.dat_w = dat_w
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self.async_read = async_read
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self.re = re
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self.we_granularity = we_granularity
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self.mode = mode
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class Memory:
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def __init__(self, width, depth, *ports, init=None):
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self.width = width
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self.depth = depth
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self.ports = ports
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self.init = init
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class Fragment:
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def __init__(self, comb=None, sync=None, instances=None, memories=None, sim=None):
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if comb is None: comb = []
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if sync is None: sync = []
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if instances is None: instances = []
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if memories is None: memories = []
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if sim is None: sim = []
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self.comb = _sl(comb)
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self.sync = _sl(sync)
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self.instances = instances
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self.memories = memories
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self.sim = sim
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def __add__(self, other):
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return Fragment(self.comb.l + other.comb.l,
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self.sync.l + other.sync.l,
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self.instances + other.instances,
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self.memories + other.memories,
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self.sim + other.sim)
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def call_sim(self, simulator):
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for s in self.sim:
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if simulator.cycle_counter >= 0 or (hasattr(s, "initialize") and s.initialize):
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s(simulator)
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