def test_mapget_of_makemap1(self):
t = THandle("T", INT)
xs = EVar("xs").with_type(TBag(t))
x = EVar("x").with_type(t)
y = EVar("y").with_type(t)
mt = TTuple((INT, INT))
e1 = EMapGet(
EMakeMap2(
xs,
ELambda(
x,
ETuple(
(EGetField(x, "val").with_type(INT), EGetField(
y,
"val").with_type(INT))).with_type(mt))).with_type(
TMap(t, mt)), y).with_type(mt)
e2 = EUnaryOp(
UOp.The,
EMap(
EFilter(
e1.map.e,
mk_lambda(e1.map.value.arg.type,
lambda foo: EEq(foo, e1.key))).with_type(
e1.map.e.type),
e1.map.value).with_type(e1.map.e.type)).with_type(
e1.map.e.type.t)
assert retypecheck(e1)
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_distinct_mapkeys(self):
xs = EVar("xs").with_type(INT_BAG)
x = EVar("x").with_type(INT)
e1 = EUnaryOp(UOp.Distinct, xs)
e2 = EMapKeys(EMakeMap2(xs, ELambda(x, T)))
assert retypecheck(e1)
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_let_discovery(self):
x = EVar("x").with_type(INT)
spec = ESum([x, x, x, x])
assert retypecheck(spec)
y = EVar("y").with_type(INT)
goal = ELet(ESum([x, x]), ELambda(y, ESum([y, y])))
assert retypecheck(goal)
assert check_discovery(spec=spec, args=[x], expected=goal)
def test_let_discovery(self):
x = EVar("x").with_type(INT)
spec = ESum([x, x, x, x])
assert retypecheck(spec)
y = EVar("y").with_type(INT)
goal = ELet(ESum([x, x]), ELambda(y, ESum([y, y])))
assert retypecheck(goal)
assert check_discovery(spec=spec, args=[x], expected=goal)
def test_distinct_mapkeys(self):
xs = EVar("xs").with_type(INT_BAG)
x = EVar("x").with_type(INT)
e1 = EUnaryOp(UOp.Distinct, xs)
e2 = EMapKeys(EMakeMap2(xs, ELambda(x, ETRUE)))
assert retypecheck(e1)
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_distribute_filter_over_subtract(self):
xs = EVar("xs").with_type(INT_BAG)
ys = EVar("ys").with_type(INT_BAG)
x = EVar("x").with_type(INT)
e1 = EFilter(EBinOp(xs, "-", ys), ELambda(x, ECall("f", (x,)).with_type(BOOL)))
assert retypecheck(e1)
e2 = EBinOp(EFilter(xs, e1.p), "-", EFilter(ys, e1.p))
assert retypecheck(e2)
self.assert_same(e1, e2)
def desugar(spec: Spec) -> Spec:
# rewrite enums
repl = {
name: EEnumEntry(name).with_type(t)
for t in all_types(spec) if isinstance(t, TEnum) for name in t.cases
}
spec = subst(spec, repl)
# convert all collection types to bags
spec = Spec(spec.name, list(spec.types), list(spec.extern_funcs),
list(spec.statevars), list(spec.assumptions),
list(spec.methods), spec.header, spec.footer, spec.docstring)
for i in range(len(spec.statevars)):
v, t = spec.statevars[i]
if isinstance(t, TSet):
# Sets become bags w/ implicit unique assumptions.
t = TBag(t.t)
spec.statevars[i] = (v, t)
v = EVar(v).with_type(t)
spec.assumptions.append(EUnaryOp(UOp.AreUnique, v).with_type(BOOL))
assert retypecheck(spec, env={})
# organize queries by name
queries = {q.name: q for q in spec.methods if isinstance(q, Query)}
class V(BottomUpRewriter):
def visit_ECall(self, e):
q = queries.get(e.func)
if q is not None:
return self.visit(
subst(
q.ret, {
arg_name: arg
for ((arg_name, ty), arg) in zip(q.args, e.args)
}))
else:
return ECall(e.func, tuple(self.visit(a)
for a in e.args)).with_type(e.type)
spec = V().visit(spec)
spec.methods = [
m for m in spec.methods
if not (isinstance(m, Query) and m.visibility == Visibility.Private)
]
class V(BottomUpRewriter):
def visit_Exp(self, e):
return desugar_list_comprehensions(e)
spec = V().visit(spec)
assert retypecheck(spec, env={})
return spec
def test_distribute_filter_over_subtract(self):
xs = EVar("xs").with_type(INT_BAG)
ys = EVar("ys").with_type(INT_BAG)
x = EVar("x").with_type(INT)
e1 = EFilter(EBinOp(xs, "-", ys), ELambda(x, ECall("f", (x,)).with_type(BOOL)))
assert retypecheck(e1)
e2 = EBinOp(EFilter(xs, e1.predicate), "-", EFilter(ys, e1.predicate))
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_easy_synth(self):
res = None
x = EVar("x").with_type(BOOL)
xs = EVar("xs").with_type(TBag(BOOL))
target = EFilter(EStateVar(xs), ELambda(x, x))
assumptions = EUnaryOp(UOp.All, xs)
assert retypecheck(target)
assert retypecheck(assumptions)
assert check_discovery(target, EStateVar(EVar("xs")), args=[x], state_vars=[xs], assumptions=assumptions)
def test_distribute_the_over_map(self):
xs = EVar("xs").with_type(INT_BAG)
x = EVar("x").with_type(INT)
e1 = EUnaryOp(UOp.The, EMap(xs, ELambda(x, ECall("f", (x,)).with_type(INT))))
assert retypecheck(e1)
e2 = ECond(
EUnaryOp(UOp.Exists, xs),
e1.e.transform_function.apply_to(EUnaryOp(UOp.The, xs)),
EUnaryOp(UOp.The, EEmptyList().with_type(xs.type)))
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_slice_of_slice(self):
xs = EVar("xs").with_type(TList(INT))
st1 = EVar("st1").with_type(INT)
ed1 = EVar("ed1").with_type(INT)
st2 = EVar("st2").with_type(INT)
ed2 = EVar("ed2").with_type(INT)
e1 = EListSlice(EListSlice(xs, st1, ed1), st2, ed2)
assert retypecheck(e1)
e2 = EListSlice(xs, EBinOp(max_of(st2, ZERO), "+", max_of(st1, ZERO)), min_of(ed1, ESum([max_of(st1, ZERO), ed2])))
assert retypecheck(e2)
self.assert_same(e1, e2, assumptions=EUnaryOp(UOp.AreUnique, xs).with_type(BOOL))
def test_distribute_the_over_map(self):
xs = EVar("xs").with_type(INT_BAG)
x = EVar("x").with_type(INT)
e1 = EUnaryOp(UOp.The, EMap(xs, ELambda(x, ECall("f", (x,)).with_type(INT))))
assert retypecheck(e1)
e2 = ECond(
EUnaryOp(UOp.Exists, xs),
e1.e.f.apply_to(EUnaryOp(UOp.The, xs)),
EUnaryOp(UOp.The, EEmptyList().with_type(xs.type)))
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_heap_enumeration(self):
xs = EVar("xs").with_type(INT_BAG)
context = RootCtx(state_vars=[xs])
cost_model = CostModel()
def not_min_or_max(e, *args, **kwargs):
# forbid min/max to ensure that heap operations get cached
if isinstance(e, EArgMin) or isinstance(e, EArgMax):
return False
return True
enumerator = Enumerator(examples=[{
"xs": Bag(())
}, {
"xs": Bag((1, 2))
}, {
"xs": Bag((1, 1))
}],
cost_model=cost_model,
check_wf=not_min_or_max)
with save_property(accelerate, "value"):
accelerate.value = False
print("-" * 20 + " Looking for xs...")
found_xs = False
for e in enumerator.enumerate(context, 0, STATE_POOL):
print(pprint(e))
if e == xs:
assert retypecheck(deep_copy(e))
found_xs = True
print("^^^ FOUND")
assert found_xs
print("-" * 20 + " Looking for heap construction...")
found_make_heap = False
for e in enumerator.enumerate(context, 1, STATE_POOL):
print(pprint(e))
if isinstance(e, EMakeMinHeap) or isinstance(e, EMakeMaxHeap):
assert retypecheck(deep_copy(e))
found_make_heap = True
print("^^^ FOUND")
assert found_make_heap
print("-" * 20 + " Looking for heap usage...")
found_heap_peek = False
for e in enumerator.enumerate(context, 2, RUNTIME_POOL):
print(pprint(e))
if isinstance(e, EHeapPeek) or isinstance(e, EHeapPeek2):
assert retypecheck(deep_copy(e))
found_heap_peek = True
print("^^^ FOUND")
assert found_heap_peek
def test_easy_synth(self):
res = None
x = EVar("x").with_type(BOOL)
xs = EVar("xs").with_type(TBag(BOOL))
target = EFilter(EStateVar(xs), ELambda(x, x))
assumptions = EUnaryOp(UOp.All, xs)
assert retypecheck(target)
assert retypecheck(assumptions)
assert check_discovery(target,
EStateVar(EVar("xs")),
args=[x],
state_vars=[xs],
assumptions=assumptions)
def test_argmin(self):
xs = EVar("xs").with_type(INT_BAG)
ys = EVar("ys").with_type(INT_BAG)
id = mk_lambda(INT, lambda x: x)
e1 = EArgMin(EBinOp(xs, "+", ys), id)
e2 = ECond(EUnaryOp(UOp.Empty, xs), EArgMin(ys, id),
ECond(EUnaryOp(UOp.Empty, ys), EArgMin(xs, id),
EArgMin(EBinOp(
ESingleton(EArgMin(xs, id)),
"+",
ESingleton(EArgMin(ys, id))), id)))
assert retypecheck(e1)
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_argmin(self):
xs = EVar("xs").with_type(INT_BAG)
ys = EVar("ys").with_type(INT_BAG)
id = mk_lambda(INT, lambda x: x)
e1 = EArgMin(EBinOp(xs, "+", ys), id)
e2 = ECond(EUnaryOp(UOp.Empty, xs), EArgMin(ys, id),
ECond(EUnaryOp(UOp.Empty, ys), EArgMin(xs, id),
EArgMin(EBinOp(
ESingleton(EArgMin(xs, id)),
"+",
ESingleton(EArgMin(ys, id))), id)))
assert retypecheck(e1)
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_map_eq(self):
k = TNative("V")
v = TBag(THandle("H", k))
t = TMap(k, v)
m1 = EVar("m1").with_type(t)
m2 = EVar("m1").with_type(t)
e = EImplies(EEq(m1, m2), EEq(EMapKeys(m1), EMapKeys(m2)))
assert retypecheck(e)
assert valid(e, collection_depth=3)
k = EVar("k").with_type(t.k)
e = EImplies(EEq(m1, m2), EEq(EMapGet(m1, k), EMapGet(m2, k)))
assert retypecheck(e)
assert valid(e, collection_depth=3)
def test_easy_synth(self):
# FIXME: resolve ETreeMultisetElems problem (#107) and support allow_random_assignment_heuristic in this case
with save_property(allow_random_assignment_heuristic, "value"):
allow_random_assignment_heuristic.value = False
x = EVar("x").with_type(BOOL)
xs = EVar("xs").with_type(TBag(BOOL))
target = EFilter(EStateVar(xs), ELambda(x, x))
assumptions = EUnaryOp(UOp.All, xs)
assert retypecheck(target)
assert retypecheck(assumptions)
assert check_discovery(target,
EStateVar(EVar("xs")),
args=[x],
state_vars=[xs],
assumptions=assumptions)
def test_map_eq(self):
k = TNative("V")
v = TBag(THandle("H", k))
t = TMap(k, v)
m1 = EVar("m1").with_type(t)
m2 = EVar("m1").with_type(t)
e = EImplies(EEq(m1, m2), EEq(EMapKeys(m1), EMapKeys(m2)))
assert retypecheck(e)
assert valid(e, collection_depth=3)
k = EVar("k").with_type(t.k)
e = EImplies(EEq(m1, m2), EEq(EMapGet(m1, k), EMapGet(m2, k)))
assert retypecheck(e)
assert valid(e, collection_depth=3)
def test_slice_of_slice(self):
xs = EVar("xs").with_type(TList(INT))
st1 = EVar("st1").with_type(INT)
ed1 = EVar("ed1").with_type(INT)
st2 = EVar("st2").with_type(INT)
ed2 = EVar("ed2").with_type(INT)
e1 = EListSlice(EListSlice(xs, st1, ed1), st2, ed2)
assert retypecheck(e1)
e2 = EListSlice(xs, EBinOp(max_of(st2, ZERO), "+", max_of(st1, ZERO)),
min_of(ed1, ESum([max_of(st1, ZERO), ed2])))
assert retypecheck(e2)
self.assert_same(e1,
e2,
assumptions=EUnaryOp(UOp.AreUnique,
xs).with_type(BOOL))
def test_heap_enumeration(self):
xs = EVar("xs").with_type(INT_BAG)
context = RootCtx(state_vars=[xs])
cost_model = CostModel()
def not_min_or_max(e, *args, **kwargs):
# forbid min/max to ensure that heap operations get cached
if isinstance(e, EArgMin) or isinstance(e, EArgMax):
return False
return True
enumerator = Enumerator(
examples=[{"xs": Bag(())}, {"xs": Bag((1,2))}, {"xs": Bag((1,1))}],
cost_model=cost_model,
check_wf=not_min_or_max)
with save_property(accelerate, "value"):
accelerate.value = False
print("-" * 20 + " Looking for xs...")
found_xs = False
for e in enumerator.enumerate(context, 0, STATE_POOL):
print(pprint(e))
if e == xs:
assert retypecheck(deep_copy(e))
found_xs = True
print("^^^ FOUND")
assert found_xs
print("-" * 20 + " Looking for heap construction...")
found_make_heap = False
for e in enumerator.enumerate(context, 1, STATE_POOL):
print(pprint(e))
if isinstance(e, EMakeMinHeap) or isinstance(e, EMakeMaxHeap):
assert retypecheck(deep_copy(e))
found_make_heap = True
print("^^^ FOUND")
assert found_make_heap
print("-" * 20 + " Looking for heap usage...")
found_heap_peek = False
for e in enumerator.enumerate(context, 2, RUNTIME_POOL):
print(pprint(e))
if isinstance(e, EHeapPeek) or isinstance(e, EHeapPeek2):
assert retypecheck(deep_copy(e))
found_heap_peek = True
print("^^^ FOUND")
assert found_heap_peek
def test_set_sub(self):
t = TSet(INT)
s1 = Bag((0, 1))
s2 = Bag((1, 0))
e = EEq(EBinOp(EVar("s1").with_type(t), "-", EVar("s2").with_type(t)), EEmptyList().with_type(t))
assert retypecheck(e)
assert eval(e, {"s1": s1, "s2": s2}) is True
def convert_sets_to_bags(spec : Spec) -> Spec:
"""Convert set-type state variables to bag-type state variables.
This function also adds invariants stating that all bags which used to be
sets have distinct elements.
"""
spec = Spec(
spec.name,
list(spec.types),
list(spec.extern_funcs),
list(spec.statevars),
list(spec.assumptions),
list(spec.methods),
spec.header,
spec.footer,
spec.docstring)
for i in range(len(spec.statevars)):
v, t = spec.statevars[i]
if isinstance(t, TSet):
t = TBag(t.elem_type)
spec.statevars[i] = (v, t)
v = EVar(v).with_type(t)
spec.assumptions.append(EUnaryOp(UOp.AreUnique, v).with_type(BOOL))
if not retypecheck(spec, env={}):
raise Exception("Set->Bag conversion failed")
return spec
def test_set_sub(self):
t = TSet(INT)
s1 = Bag((0, 1))
s2 = Bag((1, 0))
e = EEq(EBinOp(EVar("s1").with_type(t), "-", EVar("s2").with_type(t)), EEmptyList().with_type(t))
assert retypecheck(e)
assert eval(e, {"s1": s1, "s2": s2}) is True
def test_enumerate_fragments_estatevar(self):
b = EVar("b").with_type(BOOL)
e = ELet(ZERO, mk_lambda(INT, lambda x: EStateVar(b)))
assert retypecheck(e)
for (a, e, r, bound) in enumerate_fragments(e):
if e == b:
assert not bound, "EStateVar should reset bound variables, but got {}".format(bound)
def test_intersect(self):
a = EVar("a").with_type(INT_BAG)
b = EVar("b").with_type(INT_BAG)
e = EBinOp(
EIntersect(a, b), "+",
EBinOp(a, "-", b))
assert retypecheck(e)
self.assert_same(a, e, op="==")
def test_heap_wf(self):
e = EHeapPeek2(EStateVar(EMakeMinHeap(EVar('xs'), ELambda(EVar('_var21501'), EVar('_var21501')))))
assert retypecheck(e, env={
"xs": INT_BAG,
"_var21501": INT})
state_vars = OrderedSet([EVar('xs').with_type(TBag(TInt()))])
args = OrderedSet([EVar('x').with_type(TInt())])
pool = RUNTIME_POOL
assert exp_wf(e, context=RootCtx(args=args, state_vars=state_vars), pool=pool)
def test_optimized_in1(self):
xs = EVar("xs").with_type(INT_BAG)
i = EVar("i").with_type(INT)
j = EVar("j").with_type(INT)
e1 = EIn(i, EBinOp(EStateVar(xs), "-", ESingleton(j)))
assert retypecheck(e1)
e2 = optimized_in(i, e1.e2)
assert not alpha_equivalent(e1, e2)
self.assert_same(e1, e2)
def test_enumerate_fragments_bound(self):
b = EVar("b").with_type(BOOL)
e = ELet(ZERO, mk_lambda(INT, lambda x: b))
assert retypecheck(e)
for (a, x, r, bound) in enumerate_fragments(e):
if x == b:
assert bound == { e.f.arg }, "got {}".format(bound)
elif x == ZERO:
assert bound == set(), "got {}".format(bound)
def test_optimized_in2(self):
xs = EVar("xs").with_type(INT_BAG)
ys = EVar("ys").with_type(INT_BAG)
i = EVar("i").with_type(INT)
e1 = EIn(i, EBinOp(xs, "-", ys))
assert retypecheck(e1)
e2 = optimized_in(i, e1.e2)
assert not alpha_equivalent(e1, e2)
self.assert_same(e1, e2)
def test_optimized_in1(self):
xs = EVar("xs").with_type(INT_BAG)
i = EVar("i").with_type(INT)
j = EVar("j").with_type(INT)
e1 = EIn(i, EBinOp(EStateVar(xs), "-", ESingleton(j)))
assert retypecheck(e1)
e2 = optimized_in(i, e1.e2)
assert not alpha_equivalent(e1, e2)
self.assert_same(e1, e2)
def test_subsub(self):
xs = EVar("xs").with_type(INT_BAG)
i = EVar("i").with_type(INT)
e1 = EBinOp(EUnaryOp(UOp.Distinct, xs), "-",
EBinOp(xs, "-", ESingleton(i)))
assert retypecheck(e1)
m = EMakeMap2(
e1.e1,
mk_lambda(
INT, lambda x: EUnaryOp(
UOp.Length, EFilter(xs, mk_lambda(INT, lambda y: EEq(
x, y)))).with_type(INT))).with_type(TMap(INT, INT))
count = EMapGet(m, i).with_type(INT)
e2 = ECond(EEq(count, ONE),
ESingleton(i).with_type(INT_BAG),
EEmptyList().with_type(INT_BAG)).with_type(INT_BAG)
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_sub_self(self):
xs = EVar("xs").with_type(TBag(INT))
removed = EVar("removed").with_type(TBag(INT))
added = EVar("added").with_type(TBag(INT))
e = EBinOp(EBinOp(EBinOp(xs, "-", removed), "+", added), "-", xs)
assert retypecheck(e)
self.assert_same(e, added, assumptions=EAll([
# EIsSubset(removed, xs),
EDisjoint(added, removed)]))
def test_optimized_in2(self):
xs = EVar("xs").with_type(INT_BAG)
ys = EVar("ys").with_type(INT_BAG)
i = EVar("i").with_type(INT)
e1 = EIn(i, EBinOp(xs, "-", ys))
assert retypecheck(e1)
e2 = optimized_in(i, e1.e2)
assert not alpha_equivalent(e1, e2)
self.assert_same(e1, e2)
def test_no_argument_conflict_lambda(self):
x = EVar("x").with_type(TInt())
y = EVar("y").with_type(TInt())
f = ELambda(x, EBinOp(y, "+", ENum(1).with_type(INT)))
assert retypecheck(f)
g = subst(f, { y.id : x })
a = EVar("a").with_type(TInt())
b = EVar("b").with_type(TInt())
assert valid(EEq(g.apply_to(a), g.apply_to(b)))
def test_mutate_preserves_statevar(self):
x = EVar("x").with_type(INT)
e = EBinOp(EStateVar(x), "+", ONE)
assert retypecheck(e)
s = SAssign(x, EBinOp(x, "+", ONE).with_type(INT))
e2 = inc.mutate(e, s)
e2 = inc.repair_EStateVar(e2, [x])
print(pprint(e))
print(pprint(e2))
assert e2 == EBinOp(EBinOp(EStateVar(x), "+", ONE), "+", ONE)
def test_mapget_of_makemap1(self):
t = THandle("elem_type", INT)
xs = EVar("xs").with_type(TBag(t))
x = EVar("x").with_type(t)
y = EVar("y").with_type(t)
mt = TTuple((INT, INT))
e1 = EMapGet(
EMakeMap2(xs, ELambda(x,
ETuple((EGetField(x, "val").with_type(INT), EGetField(y, "val").with_type(INT))).with_type(mt)
)).with_type(TMap(t, mt)),
y).with_type(mt)
e2 = EUnaryOp(UOp.The,
EMap(
EFilter(e1.map.e,
mk_lambda(e1.map.value_function.arg.type, lambda foo: EEq(foo, e1.key))).with_type(e1.map.e.type),
e1.map.value_function).with_type(e1.map.e.type)).with_type(e1.map.e.type.elem_type)
assert retypecheck(e1)
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_mutate_preserves_statevar(self):
x = EVar("x").with_type(INT)
e = EBinOp(EStateVar(x), "+", ONE)
assert retypecheck(e)
s = SAssign(x, EBinOp(x, "+", ONE).with_type(INT))
e2 = strip_EStateVar(inc.mutate(e, s))
e2 = repair_well_formedness(e2, context=RootCtx(state_vars=[x], args=[]))
print(pprint(e))
print(pprint(e2))
assert e2 == EBinOp(EBinOp(EStateVar(x), "+", ONE), "+", ONE)
def test_no_argument_conflict_lambda(self):
x = EVar("x").with_type(TInt())
y = EVar("y").with_type(TInt())
f = ELambda(x, EBinOp(y, "+", ENum(1).with_type(INT)))
assert retypecheck(f)
g = subst(f, {y.id: x})
a = EVar("a").with_type(TInt())
b = EVar("b").with_type(TInt())
assert valid(equal(g.apply_to(a), g.apply_to(b)))
def test_mutate_preserves_statevar(self):
x = EVar("x").with_type(INT)
e = EBinOp(EStateVar(x), "+", ONE)
assert retypecheck(e)
s = SAssign(x, EBinOp(x, "+", ONE).with_type(INT))
e2 = strip_EStateVar(inc.mutate(e, s))
e2 = repair_well_formedness(e2,
context=RootCtx(state_vars=[x], args=[]))
print(pprint(e))
print(pprint(e2))
assert e2 == EBinOp(EBinOp(EStateVar(x), "+", ONE), "+", ONE)
def test_map_discovery(self):
xs = EVar("xs").with_type(INT_BAG)
y = EVar("y").with_type(INT)
spec = EFilter(EStateVar(xs), mk_lambda(INT, lambda x: EEq(x, y)))
assert retypecheck(spec)
assert check_discovery(
spec=spec,
expected=lambda e: isinstance(e, EMapGet) and isinstance(
e.map, EStateVar) and valid(EEq(e, spec)),
args=[y],
state_vars=[xs])
def test_let(self):
e1 = ELet(ZERO, ELambda(x, x))
root_ctx = RootCtx(args=(), state_vars=())
assert retypecheck(e1)
n = 0
for ee, ctx, pool in shred(e1, root_ctx, RUNTIME_POOL):
if ee == x:
e2 = replace(e1, root_ctx, RUNTIME_POOL, x, ctx, pool, ZERO)
assert e2 == ELet(ZERO, ELambda(x, ZERO))
n += 1
assert n == 1
def test_incomplete_binders_list_2(self):
res = None
x = EVar("x").with_type(BOOL)
xs = EVar("xs").with_type(TBag(BOOL))
target = EFilter(EStateVar(xs), ELambda(x, T))
assumptions = EUnaryOp(UOp.All, xs)
assert retypecheck(target)
assert retypecheck(assumptions)
def should_stop():
return res == EStateVar(EVar("xs"))
for r in improve(target,
assumptions, [], [xs], [],
CompositeCostModel(),
BinderBuilder([], [xs], []),
stop_callback=should_stop):
print(pprint(r))
res = r
assert should_stop()
def test_bag_plus_minus(self):
t = THandle("H", INT)
x = EVar("x").with_type(t)
xs = EVar("xs").with_type(TBag(t))
spec = EBinOp(EBinOp(xs, "+", ESingleton(x)), "-", ESingleton(x))
expected = xs
assert retypecheck(spec)
assert valid(EEq(spec, expected))
ex = satisfy(ENot(EBinOp(spec, "===", expected).with_type(BOOL)))
assert ex is not None
assert check_discovery(spec=spec, expected=expected, args=[x, xs], examples=[ex])
def test_bind_callback(self):
xs = EVar("xs").with_type(TBag(INT))
x = EVar("x").with_type(INT)
e = EFilter(xs, ELambda(x, equal(x, ENum(1).with_type(INT))))
assert retypecheck(e)
numbers = [0, 1, 1, 2, 3, 4]
binds = []
m = eval(e,
env={xs.id: Bag(numbers)},
bind_callback=lambda arg, val: binds.append((arg, val)))
assert m == Bag([1, 1]), "m={}".format(m)
assert binds == [(x, i) for i in numbers], "binds={}".format(binds)
def test_enumerate_fragments_strange_binder_behavior(self):
xs = EVar("xs").with_type(TBag(INT))
x = EVar("x").with_type(INT)
xs_eq_zero = EFilter(xs, ELambda(x, equal(x, ZERO)))
e = EFilter(xs_eq_zero, ELambda(x,
equal(
EFilter(xs, ELambda(x, T)),
EEmptyList().with_type(xs.type))))
assert retypecheck(e)
for (a, e, r, bound) in enumerate_fragments(e):
if e == T:
assert not valid(implies(EAll(a), equal(x, ZERO)), validate_model=True), "assumptions at {}: {}".format(pprint(e), "; ".join(pprint(aa) for aa in a))
def test_var_under_estatevar(self):
# wow, very tricky!
# EStateVar(...) needs to be "separable" from the parent, so bound vars
# get cleared. Thus, if EStateVar(x) appears somewhere, then `x` is
# is free, even if it appears in e.g. \x -> EStateVar(x).
x = EVar("x").with_type(INT)
e = EUnaryOp(UOp.Exists, EFilter(ESingleton(ONE), ELambda(x, EStateVar(EEq(x, ZERO)))))
print(pprint(e))
assert retypecheck(e)
assert x in free_vars(e), free_vars(e)
sub = subst(e, {"x":ZERO})
assert sub == EUnaryOp(UOp.Exists, EFilter(ESingleton(ONE), ELambda(x, EStateVar(EEq(ZERO, ZERO))))), pprint(sub)
def test_subsub(self):
xs = EVar("xs").with_type(INT_BAG)
i = EVar("i").with_type(INT)
e1 = EBinOp(
EUnaryOp(UOp.Distinct, xs), "-",
EBinOp(
xs, "-",
ESingleton(i)))
assert retypecheck(e1)
m = EMakeMap2(e1.e1,
mk_lambda(INT, lambda x:
EUnaryOp(UOp.Length, EFilter(xs,
mk_lambda(INT, lambda y:
EEq(x, y)))).with_type(INT))).with_type(TMap(INT, INT))
count = EMapGet(m, i).with_type(INT)
e2 = ECond(
EEq(count, ONE),
ESingleton(i).with_type(INT_BAG),
EEmptyList().with_type(INT_BAG)).with_type(INT_BAG)
assert retypecheck(e2)
self.assert_same(e1, e2)
def test_map_discovery2(self):
xs = EVar("xs").with_type(INT_BAG)
y = EVar("y").with_type(INT)
spec = EIn(y, EStateVar(xs))
assert retypecheck(spec)
assert check_discovery(
spec=spec,
expected=lambda e:
(isinstance(e, EMapGet) or isinstance(e, EHasKey)) and isinstance(
e.map, EStateVar) and valid(EEq(e, spec)),
args=[y],
state_vars=[xs])
def test_let(self):
e1 = ELet(ZERO, ELambda(x, x))
root_ctx = RootCtx(args=(), state_vars=())
assert retypecheck(e1)
n = 0
for ee, ctx, pool in all_subexpressions_with_context_information(e1, root_ctx, RUNTIME_POOL):
if ee == x:
e2 = replace(
e1, root_ctx, RUNTIME_POOL,
x, ctx, pool,
ZERO)
assert e2 == ELet(ZERO, ELambda(x, ZERO))
n += 1
assert n == 1
def test_estatevar_ctx(self):
xs = EVar("xs").with_type(INT_BAG)
x = EVar("x").with_type(INT)
y = EVar("y").with_type(BOOL)
e = EMap(xs, ELambda(x, EStateVar(y)))
ctx = RootCtx(args=(xs,), state_vars=(y,))
assert retypecheck(e)
for ee, ctx, pool in all_subexpressions_with_context_information(e, ctx):
if ee == y:
assert isinstance(ctx, RootCtx)
e = replace(
e, ctx, RUNTIME_POOL,
y, ctx, STATE_POOL,
ETRUE)
assert e == EMap(xs, ELambda(x, EStateVar(ETRUE))), pprint(e)
def test_pool_affects_alpha_equivalence(self):
e = EMap(EEmptyList().with_type(INT_BAG), ELambda(x, ONE))
root_ctx = RootCtx(args=(), state_vars=())
assert retypecheck(e)
c1 = []
for ee, ctx, pool in all_subexpressions_with_context_information(e, root_ctx, RUNTIME_POOL):
if ee == ONE:
c1.append(ctx)
assert len(c1) == 1
c1 = c1[0]
c2 = []
for ee, ctx, pool in all_subexpressions_with_context_information(e, root_ctx, STATE_POOL):
if ee == ONE:
c2.append(ctx)
assert len(c2) == 1
c2 = c2[0]
assert c1 != c2
assert not c1.alpha_equivalent(c2)
def test_ECond_3(self):
x = ENum(1).with_type(INT)
y = EBool(False)
assert not retypecheck(ECond(EBool(True), y, x))
def _simple_filter(xs : Exp, p : ELambda, args : {EVar}):
"""Assumes the body of p is already in negation normal form"""
if p.body == ETRUE:
yield xs
return
if p.body == EFALSE:
yield EEmptyList().with_type(xs.type)
return
if isinstance(xs, EEmptyList):
yield xs
return
yielded = False
if isinstance(xs, ESingleton):
yielded = True
yield optimized_cond(p.apply_to(xs.e), xs, EEmptyList().with_type(xs.type))
if isinstance(p.body, EBinOp) and p.body.op == BOp.Or:
for e1, e2 in itertools.permutations([p.body.e1, p.body.e2]):
for r1 in _simple_filter(xs, ELambda(p.arg, e1), args):
for r2 in _simple_filter(xs, ELambda(p.arg, EAll([e2, ENot(e1)])), args):
yielded = True
yield EBinOp(r1, "+", r2).with_type(xs.type)
if isinstance(p.body, EBinOp) and p.body.op == BOp.And:
for e1, e2 in itertools.permutations([p.body.e1, p.body.e2]):
for r1 in _simple_filter(xs, ELambda(p.arg, e1), args):
yielded = True
yield from _simple_filter(r1, ELambda(p.arg, e2), args)
if isinstance(xs, EStateVar) and not any(v in args for v in free_vars(p)):
yielded = True
yield EStateVar(EFilter(xs.e, strip_EStateVar(p)).with_type(xs.type)).with_type(xs.type)
if isinstance(xs, EMapGet) and isinstance(xs.map, EStateVar) and not any(v in args for v in free_vars(p)):
for m in map_values_multi(xs.map.e, lambda ys: _simple_filter(ys, p, args)):
yielded = True
yield EMapGet(EStateVar(m).with_type(m.type), xs.key).with_type(xs.type)
if isinstance(xs, EBinOp) and xs.op in ("+", "-"):
for e1 in _simple_filter(xs.e1, p, args):
for e2 in _simple_filter(xs.e2, p, args):
yielded = True
yield EBinOp(e1, xs.op, e2).with_type(xs.type)
if isinstance(p.body, EBinOp) and p.body.op == "==":
e1 = p.body.e1
e2 = p.body.e2
fvs2 = free_vars(e2)
fvs1 = free_vars(e1)
for (e1, fvs1), (e2, fvs2) in itertools.permutations([(e1, fvs1), (e2, fvs2)]):
if p.arg in fvs1 and not any(a in fvs1 for a in args) and p.arg not in fvs2 and isinstance(xs, EStateVar):
if e1 == p.arg:
yield optimized_cond(
optimized_in(e2, xs),
ESingleton(e2).with_type(xs.type),
EEmptyList().with_type(xs.type))
k = fresh_var(e1.type)
e = EMapGet(
EStateVar(
EMakeMap2(
EMap(xs.e, ELambda(p.arg, e1)),
ELambda(k, EFilter(xs.e, ELambda(p.arg, EEq(e1, k)))))),
e2)
res = retypecheck(e)
assert res
yielded = True
yield e
if not yielded:
yield EFilter(xs, p).with_type(xs.type)
def test_ECond_4(self):
x = ENum(1).with_type(INT)
assert not retypecheck(ECond(x, x, x))
def test_lambda_arg_inference(self):
s = ESingleton(ETRUE)
x = EVar("x")
assert retypecheck(EFilter(s, ELambda(x, x)))
assert retypecheck(EMap(s, ELambda(x, x)))
assert retypecheck(EMakeMap2(s, ELambda(x, x)))
def test_heaps(self):
e = ECond(EBinOp(EBinOp(EMapGet(EStateVar(EMakeMap2(EVar('xs'), ELambda(EVar('_var39381'), EUnaryOp('len', EFilter(EVar('xs'), ELambda(EVar('_var39382'), EBinOp(EVar('_var39381'), '==', EVar('_var39382')))))))), ENum(0).with_type(INT)), '==', ENum(1).with_type(INT)), 'and', EBinOp(ENum(0).with_type(INT), '==', EStateVar(EArgMin(EVar('xs'), ELambda(EVar('_var21501'), EVar('_var21501')))))), EHeapPeek2(EStateVar(EMakeMinHeap(EVar('xs'), ELambda(EVar('_var21501'), EVar('_var21501'))))), EStateVar(EArgMin(EVar('xs'), ELambda(EVar('_var21501'), EVar('_var21501')))))
assert retypecheck(e, env={
"xs": INT_BAG,
"_var21501": INT})
def test_map_discovery(self):
xs = EVar("xs").with_type(INT_BAG)
y = EVar("y").with_type(INT)
spec = EFilter(EStateVar(xs), mk_lambda(INT, lambda x: EEq(x, y)))
assert retypecheck(spec)
assert check_discovery(spec=spec, expected=lambda e: isinstance(e, EMapGet) and isinstance(e.map, EStateVar) and valid(EEq(e, spec)), args=[y], state_vars=[xs])
def test_map_discovery2(self):
xs = EVar("xs").with_type(INT_BAG)
y = EVar("y").with_type(INT)
spec = EIn(y, EStateVar(xs))
assert retypecheck(spec)
assert check_discovery(spec=spec, expected=lambda e: (isinstance(e, EMapGet) or isinstance(e, EHasKey)) and isinstance(e.map, EStateVar) and valid(EEq(e, spec)), args=[y], state_vars=[xs])
