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infer_type: better rules

This commit is contained in:
Sebastien Bourdeauducq 2014-08-16 20:58:10 +08:00
parent 232092166e
commit 02798d1996
1 changed files with 105 additions and 60 deletions

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@ -1,16 +1,11 @@
from collections import namedtuple from collections import namedtuple
from fractions import gcd
import ast import ast
from artiq.language import units from artiq.language import units
def _lcm(a, b):
return a*b//gcd(a, b)
TBool = namedtuple("TBool", "") TBool = namedtuple("TBool", "")
TFloat = namedtuple("TFloat", "") TFloat = namedtuple("TFloat", "")
TInt = namedtuple("TInt", "nbits") TInt = namedtuple("TInt", "nbits")
TFractionCD = namedtuple("TFractionCD", "denominator")
TFraction = namedtuple("TFraction", "") TFraction = namedtuple("TFraction", "")
class TypeAnnotation: class TypeAnnotation:
@ -25,6 +20,9 @@ class TypeAnnotation:
r += ")" r += ")"
return r return r
def __eq__(self, other):
return self.t == other.t and self.unit == other.unit
def promote(self, ta): def promote(self, ta):
if ta.unit != self.unit: if ta.unit != self.unit:
raise units.DimensionError raise units.DimensionError
@ -37,25 +35,107 @@ class TypeAnnotation:
elif isinstance(self.t, TInt): elif isinstance(self.t, TInt):
if isinstance(ta.t, TInt): if isinstance(ta.t, TInt):
self.t = TInt(max(self.t.nbits, ta.t.nbits)) 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: else:
raise TypeError raise TypeError
elif isinstance(self.t, TFraction): elif isinstance(self.t, TFraction):
if not isinstance(ta.t, (TInt, TFractionCD, TFraction)): if not isinstance(ta.t, TFraction):
raise TypeError raise TypeError
else: else:
raise TypeError raise TypeError
def _get_addsub_type(l, r):
if l.unit != r.unit:
raise units.DimensionError
if isinstance(l.t, TFloat):
if isinstance(r.t, (TFloat, TInt, TFraction)):
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)):
return r
if isinstance(l.t, TFraction) and isinstance(r.t, TFloat):
return r
if isinstance(l.t, TFraction) and isinstance(r.t, (TInt, TFraction)):
return l
raise TypeError
def _get_mul_type(l, r):
unit = l.unit
if r.unit is not None:
if unit is None:
unit = r.unit
else:
raise NotImplementedError
if isinstance(l.t, TFloat):
if isinstance(r.t, (TFloat, TInt, TFraction)):
return TypeAnnotation(TFloat(), unit)
else:
raise TypeError
if isinstance(l.t, TInt) and isinstance(r.t, TInt):
return TypeAnnotation(TInt(max(l.t.nbits, r.t.nbits)), unit)
if isinstance(l.t, TInt) and isinstance(r.t, (TFloat, TFraction)):
return TypeAnnotation(r.t, unit)
if isinstance(l.t, TFraction) and isinstance(r.t, TFloat):
return TypeAnnotation(TFloat(), unit)
if isinstance(l.t, TFraction) and isinstance(r.t, (TInt, TFraction)):
return TypeAnnotation(TFraction(), unit)
raise TypeError
def _get_div_unit(l, r):
if l.unit is not None and r.unit is None:
return l.unit
elif l.unit == r.unit:
return None
else:
raise NotImplementedError
def _get_truediv_type(l, r):
unit = _get_div_unit(l, r)
if isinstance(l.t, (TInt, TFraction)) and isinstance(r.t, TFraction):
return TypeAnnotation(TFraction(), unit)
elif isinstance(l.t, TFraction) and isinstance(r.t, (TInt, TFraction)):
return TypeAnnotation(TFraction(), unit)
else:
return TypeAnnotation(TFloat(), unit)
def _get_floordiv_type(l, r):
unit = _get_div_unit(l, r)
if isinstance(l.t, TInt) and isinstance(r.t, TInt):
return TypeAnnotation(TInt(max(l.t.nbits, r.t.nbits)), unit)
elif isinstance(l.t, (TInt, TFloat)) and isinstance(r.t, TFloat):
return TypeAnnotation(TFloat(), unit)
elif isinstance(l.t, TFloat) and isinstance(r.t, (TInt, TFloat)):
return TypeAnnotation(TFloat(), unit)
elif (isinstance(l.t, TFloat) and isinstance(r.t, TFraction)) or (isinstance(l.t, TFraction) and isinstance(r.t, TFloat)):
return TypeAnnotation(TInt(64), unit)
elif isinstance(l.t, (TInt, TFraction)) and isinstance(r.t, TFraction):
return TypeAnnotation(TFraction(), unit)
elif isinstance(l.t, TFraction) and isinstance(r.t, (TInt, TFraction)):
return TypeAnnotation(TFraction(), unit)
else:
raise NotImplementedError
def _get_call_type(sym_to_type, node):
fn = node.func.id
if fn == "bool":
return TypeAnnotation(TBool())
elif fn == "float":
return TypeAnnotation(TFloat())
elif fn == "int" or fn == "round":
return TypeAnnotation(TInt(32))
elif fn == "int64" or fn == "round64":
return TypeAnnotation(TInt(64))
elif fn == "Fraction":
return TypeAnnotation(TFraction())
elif fn == "Quantity":
ta = _get_expr_type(sym_to_type, node.args[0])
ta.unit = getattr(units, node.args[1].id)
return ta
else:
raise NotImplementedError
def _get_expr_type(sym_to_type, node): def _get_expr_type(sym_to_type, node):
if isinstance(node, ast.NameConstant): if isinstance(node, ast.NameConstant):
if isinstance(node.value, bool): if isinstance(node.value, bool):
@ -79,52 +159,17 @@ def _get_expr_type(sym_to_type, node):
elif isinstance(node, ast.BinOp): elif isinstance(node, ast.BinOp):
l, r = _get_expr_type(sym_to_type, node.left), _get_expr_type(sym_to_type, node.right) 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 isinstance(node.op, (ast.Add, ast.Sub)):
if l.unit != r.unit: return _get_addsub_type(l, r)
raise units.DimensionError elif isinstance(node.op, ast.Mul):
if isinstance(l.t, TFloat): return _get_mul_type(l, r)
if isinstance(r.t, (TFloat, TInt, TFraction, TFractionCD)): elif isinstance(node.op, ast.Div):
return l return _get_truediv_type(l, r)
else: elif isinstance(node.op, ast.FloorDiv):
raise TypeError return _get_floordiv_type(l, r)
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: else:
raise NotImplementedError raise NotImplementedError
elif isinstance(node, ast.Call): elif isinstance(node, ast.Call):
if node.func.id == "bool": return _get_call_type(sym_to_type, node)
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: else:
raise NotImplementedError raise NotImplementedError