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compiler: add infer_types module (WIP)

This commit is contained in:
Sebastien Bourdeauducq 2014-08-13 22:08:34 +08:00
parent 04b72642c2
commit 8bdc7964b8
1 changed files with 134 additions and 0 deletions

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from collections import namedtuple
from fractions import gcd
import ast
from artiq.language import units
def _lcm(a, b):
return a*b//gcd(a, b)
TBool = namedtuple("TBool", "")
TFloat = namedtuple("TFloat", "")
TInt = namedtuple("TInt", "nbits")
TFractionCD = namedtuple("TFractionCD", "denominator")
TFraction = namedtuple("TFraction", "")
class TypeAnnotation:
def __init__(self, t, unit=None):
self.t = t
self.unit = unit
def __repr__(self):
r = "TypeAnnotation("+str(self.t)
if self.unit is not None:
r += " <unit:"+str(self.unit.name)+">"
r += ")"
return r
def promote(self, ta):
if ta.unit != self.unit:
raise units.DimensionError
if isinstance(self.t, TBool):
if not isinstance(ta.t, TBool):
raise TypeError
elif isinstance(self.t, TFloat):
if not isinstance(ta.t, TFloat):
raise TypeError
elif isinstance(self.t, TInt):
if isinstance(ta.t, TInt):
self.t = TInt(max(self.t.nbits, ta.t.nbits))
elif isinstance(ta.t, (TFractionCD, TFraction)):
self.t = ta.t
else:
raise TypeError
elif isinstance(self.t, TFractionCD):
if isinstance(ta.t, TInt):
pass
elif isinstance(ta.t, TFractionCD):
self.t = TFractionCD(_lcm(self.t.denominator, ta.t.denominator))
elif isinstance(ta.t, TFraction):
self.t = TFraction()
else:
raise TypeError
elif isinstance(self.t, TFraction):
if not isinstance(ta.t, (TInt, TFractionCD, TFraction)):
raise TypeError
else:
raise TypeError
def _get_expr_type(sym_to_type, node):
if isinstance(node, ast.NameConstant):
if isinstance(node.value, bool):
return TypeAnnotation(TBool())
else:
raise TypeError
elif isinstance(node, ast.Num):
if isinstance(node.n, int):
nbits = 32 if abs(node.n) < 2**31 else 64
return TypeAnnotation(TInt(nbits))
elif isinstance(node.n, float):
return TypeAnnotation(TFloat())
else:
raise TypeError
elif isinstance(node, ast.Name):
return sym_to_type[node.id]
elif isinstance(node, ast.UnaryOp):
return _get_expr_type(sym_to_type, node.operand)
elif isinstance(node, ast.Compare):
return TypeAnnotation(TBool())
elif isinstance(node, ast.BinOp):
l, r = _get_expr_type(sym_to_type, node.left), _get_expr_type(sym_to_type, node.right)
if isinstance(node.op, (ast.Add, ast.Sub)):
if l.unit != r.unit:
raise units.DimensionError
if isinstance(l.t, TFloat):
if isinstance(r.t, (TFloat, TInt, TFraction, TFractionCD)):
return l
else:
raise TypeError
if isinstance(l.t, TInt) and isinstance(r.t, TInt):
return TypeAnnotation(TInt(max(l.t.nbits, r.t.nbits)), l.unit)
if isinstance(l.t, TInt) and isinstance(r.t, (TFloat, TFraction, TFractionCD)):
return r
if isinstance(l.t, (TFractionCD, TFraction)) and isinstance(r.t, TFloat):
return r
if isinstance(l.t, TFractionCD) and isinstance(r.t, TInt):
return l
if isinstance(l.t, TFractionCD) and isinstance(r.t, TFractionCD):
return TypeAnnotation(TFractionCD(_lcm(l.t.denominator, r.t.denominator)), l.unit)
if isinstance(l.t, TFractionCD) and isinstance(r.t, TFraction):
return TypeAnnotation(TFraction())
if isinstance(l.t, TFraction) and isinstance(r.t, (TInt, TFractionCD, TFraction)):
return l
raise TypeError
else:
raise NotImplementedError
elif isinstance(node, ast.Call):
if node.func.id == "bool":
return TypeAnnotation(TBool())
elif node.func.id == "float":
return TypeAnnotation(TFloat())
elif node.func.id == "int":
return TypeAnnotation(TInt(32))
elif node.func.id == "int64":
return TypeAnnotation(TInt(64))
elif node.func.id == "Fraction":
if len(node.args) == 2 and isinstance(node.args[1], ast.Num):
if not isinstance(node.args[1].n, int):
raise TypeError
return TypeAnnotation(TFractionCD(node.args[1].n))
else:
return TypeAnnotation(TFraction())
elif node.func.id == "Quantity":
ta = _get_expr_type(sym_to_type, node.args[0])
ta.unit = getattr(units, node.args[1].id)
return ta
else:
raise NotImplementedError
else:
raise NotImplementedError
if __name__ == "__main__":
import sys
testexpr = ast.parse(sys.argv[1], mode="eval")
print(_get_expr_type(dict(), testexpr.body))