def mk_variant_assign_clauses(lhs, rhs):
n = lhs.rep
new_n = new(n)
args = lhs.args
dlhs = new_n(*sym_placeholders(n))
vs = dlhs.args
eqs = [
eq_atom(v, a) for (v, a) in zip(vs, args)
if not isinstance(a, Variable)
]
rn = dict((a.rep, v) for v, a in zip(vs, args) if isinstance(a, Variable))
drhs = substitute_ast(rhs, rn)
nondet = n.suffix("_nd").skolem()
if eqs:
nondet = Ite(And(*eqs), nondet, n(*dlhs.args))
lsort, rsort = lhs.sort, rhs.sort
fmlas = [
Iff(
pto(lsort, rsort)(dlhs, Variable('X', rsort)),
Equals(Variable('X', rsort), drhs))
]
for s in ivy_module.module.variants[lsort.name]:
if s != rsort:
fmlas.append(Not(pto(lsort, s)(dlhs, Variable('X', s))))
new_clauses = Clauses(fmlas, [Definition(dlhs, nondet)])
return new_clauses
def match(self,action):
""" if action matches pattern, return the axioms, else None """
## print "match: %s %s" % (self,action)
subst = dict()
if self.pattern.match(action,self.placeholders.args,subst):
# print "match: {}".format(subst)
axioms_as_clause_sets = (formula_to_clauses(x) for x in (Not(self.precond),self.transrel))
return (subst_both_clauses(x,subst) for x in axioms_as_clause_sets)
return None
def subactions(self):
if isinstance(self.args[0], ivy_ast.Some):
ps = list(self.args[0].params())
fmla = self.args[0].fmla()
vs = [
Variable('V{}'.format(idx), x.sort) for idx, x in enumerate(ps)
]
subst = dict((c, v) for c, v in zip(ps, vs))
sfmla = substitute_constants_ast(fmla, subst)
if isinstance(self.args[0], ivy_ast.SomeMinMax):
idx = self.args[0].index()
if idx not in ps:
ltsym = Symbol('<', RelationSort([idx.sort, idx.sort]))
operator = lambda x, y: Not(ltsym(x, y))
ivar = substitute_constants_ast(idx, subst)
comp = operator(ivar, idx) if isinstance(
self.args[0], ivy_ast.SomeMin) else operator(
idx, ivar)
fmla = And(fmla, Implies(sfmla, comp))
else:
leqsym = Symbol('<=', RelationSort([idx.sort, idx.sort]))
operator = lambda x, y: And(leqsym(x, y), Not(Equals(x, y))
)
ivar = next(v for p, v in zip(ps, vs) if p == idx)
comp = operator(ivar, idx) if isinstance(
self.args[0], ivy_ast.SomeMin) else operator(
idx, ivar)
fmla = And(fmla, Not(And(sfmla, comp)))
if_part = LocalAction(
*(ps + [Sequence(AssumeAction(fmla), self.args[1])]))
else_action = self.args[2] if len(self.args) >= 3 else Sequence()
else_part = Sequence(AssumeAction(Not(sfmla)), else_action)
# iu.dbg('if_part')
# iu.dbg('else_part')
else:
if not is_boolean(self.args[0]):
raise IvyError(self, 'condition must be boolean')
if_part = Sequence(AssumeAction(self.args[0]), self.args[1])
else_action = self.args[2] if len(self.args) >= 3 else Sequence()
else_part = Sequence(AssumeAction(dual_formula(self.args[0])),
else_action)
return if_part, else_part
def int_update(self, domain, pvars):
if determinize and len(self.args) == 2:
cond = bool_const('___branch:' + str(self.unique_id))
ite = IfAction(Not(cond), self.args[0], self.args[1])
return ite.int_update(domain, pvars)
result = [], false_clauses(), false_clauses()
for a in self.args:
foo = a.int_update(domain, pvars)
result = join_action(result, foo, domain.relations)
return result
def condition_update_on_fmla(update, fmla, relations):
"""Given an update, return an update conditioned on fmla. Maybe an "else" would
be useful too :-).
"""
updated, if_clauses, if_pre = update
else_clauses = update_frame_constraint(update, relations)
if_clauses = condition_clauses(if_clauses, fmla)
else_clauses = condition_clauses(else_clauses, Not(fmla))
## print "if_clauses: %s" % if_clauses
## print "else_clauses: %s" % else_clauses
return updated, (and_clauses(if_clauses, else_clauses)), if_pre
def expand(self,domain,pvars):
modset,pre,post = self.args[1].int_update(domain,pvars) # TODO:cheaper way to get modset
asserts = self.args[2:]
assumes = [a.assert_to_assume() for a in asserts]
havocs = [HavocAction(sym) for sym in modset]
res = Sequence(*(
asserts +
havocs +
assumes +
[ChoiceAction(Sequence(),Sequence(*([AssumeAction(self.args[0]),
self.args[1]]+asserts+[AssumeAction(And())]))),
AssumeAction(Not(self.args[0]))]))
return res
def condition_update_on_fmla(update, fmla):
"""Given an update, return an update conditioned on fmla. Maybe an "else" would
be useful too :-).
"""
assert isinstance(update, SemValue)
updated, if_clauses, if_pre = update.comps
else_clauses = update_frame_constraint(update)
if_clauses = condition_clauses(if_clauses, fmla)
else_clauses = condition_clauses(else_clauses, Not(fmla))
## print "if_clauses: %s" % if_clauses
## print "else_clauses: %s" % else_clauses
return type(update)(updated, (and_clauses(if_clauses, else_clauses)),
if_pre)
def action_update(self, domain, pvars):
lhs = type_ast(domain, self.args[0])
n = lhs.rep
new_n = new(n)
args = lhs.args
vs = [Variable("X%d" % i, s) for i, s in enumerate(n.sort.dom)]
eqs = [
eq_atom(v, a) for (v, a) in zip(vs, args)
if not isinstance(a, Variable)
]
if is_atom(lhs):
clauses = And(
*([Or(Not(Atom(new_n, vs)), Atom(n, vs), eq) for eq in eqs] +
[Or(Atom(new_n, vs), Not(Atom(n, vs)), eq) for eq in eqs]))
elif is_individual_ast(lhs.rep):
clauses = And(*[
Or(eq_atom(type(lhs)(new_n, vs),
type(lhs)(n, vs)), eq) for eq in eqs
])
else: # TODO: ???
clauses = And()
clauses = formula_to_clauses(clauses)
return ([n], clauses, false_clauses())
def unroll(self, card, body=None):
cond = self.args[0]
while isinstance(cond, And) and len(cond.args) > 0:
cond = cond.args[0]
if is_app(cond) and cond.rep.name in ['<', '>', '<=', '>=']:
idx_sort = cond.args[0].sort
elif isinstance(cond, Not) and is_eq(cond.args[0]):
idx_sort = cond.args[0].args[0].sort
else:
raise IvyError(self, 'cannot determine an index sort for loop')
cardsort = card(idx_sort)
if cardsort is None:
raise IvyError(
self,
'cannot determine an iteration bound for loop over {}'.format(
idx_sort))
res = AssumeAction(Not(self.args[0]))
for idx in range(cardsort):
res = IfAction(self.args[0], Sequence(body or self.args[1], res))
if hasattr(self, 'formal_params'):
res.formal_params = self.formal_params
if hasattr(self, 'formal_returns'):
res.formal_returns = self.formal_returns
return res
def sign(polarity,atom):
return atom if polarity else Not(atom)
def equiv_ast(ast1,ast2):
if is_individual_ast(ast1): # ast2 had better be the same!
return eq_atom(ast1,ast2)
return And(Or(ast1,Not(ast2)),Or(Not(ast1),ast2))
def assert_action(fmla):
fail_flag = Symbol("sys:fail", RelationSort([]))
return SemActionValue(
[fail_flag], true_clauses(),
Clauses(defs=[Definition(new(fail_flag), Or(fail_flag, Not(fmla)))]))
def check_can_assert(fmla, ast):
check_can_assume(fmla, ast)
logic = ivy_module.logic()
if not is_in_logic(Not(fmla), logic):
raise IvyError(
ast, "This formula is not in logic {} when negated.".format(logic))
