def lit2bdd(self, lit):
""" Convert AIGER lit into BDD """
# query cache
if lit in self.lit_to_bdd:
return self.lit_to_bdd[lit]
# get stripped lit
stripped_lit = strip_lit(lit)
(intput, latch, and_gate) = self.get_lit_type(stripped_lit)
# is it an input, latch, gate or constant
if intput or latch:
result = BDD(stripped_lit)
elif and_gate:
result = (self.lit2bdd(and_gate.rhs0) &
self.lit2bdd(and_gate.rhs1))
else: # 0 literal, 1 literal and errors
result = BDD.false()
# cache result
self.lit_to_bdd[stripped_lit] = result
self.bdd_to_lit[result] = stripped_lit
# check for negation
if lit_is_negated(lit):
result = ~result
self.lit_to_bdd[lit] = result
self.bdd_to_lit[result] = lit
return result
def lit2formula(self, lit):
if lit in self.lit_to_formula:
return self.lit_to_formula[lit]
# get stripped lit
stripped_lit = strip_lit(lit)
is_neg = lit_is_negated(lit)
(input, latch, and_gate) = self.aig.get_lit_type(stripped_lit)
# is it an input, latch, gate or constant
if input or latch:
# Boolean variables are encoded as 1-bit integers for now
result = "({0})".format(self.name_of(stripped_lit))
elif and_gate:
if numeric_mode:
result = ("({0} * {1})".format(self.lit2formula(and_gate.rhs0),
self.lit2formula(
and_gate.rhs1)))
else:
result = ("({0} && {1})".format(
self.lit2formula(and_gate.rhs0),
self.lit2formula(and_gate.rhs1)))
else: # 0 literal, 1 literal and errors
result = "0" # this means false
# cache result
self.lit_to_formula[stripped_lit] = result
if is_neg:
if result == "0":
result = "1"
else:
if numeric_mode:
result = "(1-{0})".format(result)
else:
result = "!{0}".format(result)
self.lit_to_formula[lit] = result
return result
def get_bdd_for_aig_lit(lit):
""" Convert AIGER lit into BDD.
param lit: 'signed' value of gate
returns: BDD representation of the input literal
"""
# query cache
if lit in lit_to_bdd:
return lit_to_bdd[lit]
# get stripped lit
stripped_lit = aig.strip_lit(lit)
if stripped_lit == error_fake_latch.lit:
(intput, latch, and_gate) = (None, error_fake_latch, None)
else:
(intput, latch, and_gate) = aig.get_lit_type(stripped_lit)
# is it an input, latch, gate or constant
if intput or latch:
result = bdd.BDD(stripped_lit)
elif and_gate:
result = (get_bdd_for_aig_lit(and_gate.rhs0) &
get_bdd_for_aig_lit(and_gate.rhs1))
else: # 0 literal, 1 literal and errors
result = bdd.false()
# cache result
lit_to_bdd[stripped_lit] = result
bdd_to_lit[result] = stripped_lit
# check for negation
if aig.lit_is_negated(lit):
result = ~result
lit_to_bdd[lit] = result
bdd_to_lit[result] = lit
return result
def lit2bdd(self, lit):
""" Convert AIGER lit into BDD """
# query cache
if lit in self.lit_to_bdd:
return self.lit_to_bdd[lit]
# get stripped lit
stripped_lit = strip_lit(lit)
(intput, latch, and_gate) = self.get_lit_type(stripped_lit)
# is it an input, latch, gate or constant
if intput or latch:
result = BDD(stripped_lit)
elif and_gate:
result = (self.lit2bdd(and_gate.rhs0)
& self.lit2bdd(and_gate.rhs1))
else: # 0 literal, 1 literal and errors
result = BDD.false()
# cache result
self.lit_to_bdd[stripped_lit] = result
self.bdd_to_lit[result] = stripped_lit
# check for negation
if lit_is_negated(lit):
result = ~result
self.lit_to_bdd[lit] = result
self.bdd_to_lit[result] = lit
return result
def get_bdd_for_aig_lit(lit):
""" Convert AIGER lit into BDD.
param lit: 'signed' value of gate
returns: BDD representation of the input literal
"""
# query cache
if lit in lit_to_bdd:
return lit_to_bdd[lit]
# get stripped lit
stripped_lit = aig.strip_lit(lit)
if stripped_lit == error_fake_latch.lit:
(intput, latch, and_gate) = (None, error_fake_latch, None)
else:
(intput, latch, and_gate) = aig.get_lit_type(stripped_lit)
# is it an input, latch, gate or constant
if intput or latch:
result = bdd.BDD(stripped_lit)
elif and_gate:
result = (get_bdd_for_aig_lit(and_gate.rhs0)
& get_bdd_for_aig_lit(and_gate.rhs1))
else: # 0 literal, 1 literal and errors
result = bdd.false()
# cache result
lit_to_bdd[stripped_lit] = result
bdd_to_lit[result] = stripped_lit
# check for negation
if aig.lit_is_negated(lit):
result = ~result
lit_to_bdd[lit] = result
bdd_to_lit[result] = lit
return result
def trans_rel_CNF():
global cached_tr_cnf
# we create a fake latch for the error
introduce_error_latch()
if cached_tr_cnf is not None:
return cached_tr_cnf
# per latch, handle the next function
T = sat.CNF()
for l in iterate_latches():
# easy case, the latch just directly maps input or terminal
(ii, ll, a) = get_lit_type(l.next)
if not a:
if l.next == 0 or l.next == 1: # is it a terminal?
T.add_mand(get_primed_var(l.lit), [l.next])
else: # otherwise
x = strip_lit(l.next) * -1 if lit_is_negated(l.next)\
else strip_lit(l.next)
T.add_mand(get_primed_var(l.lit), [x])
else: # complicated case, l.next is an AND
if lit_is_negated(l.next):
A = set([strip_lit(l.next) * -1])
B = set([strip_lit(l.next)])
else:
(A, B) = get_mand(l.next)
T.add_mand(get_primed_var(l.lit), A)
pending = B
# handle CNF for each pending gate
while pending:
cur = pending.pop()
(A, B) = get_mand(cur)
pending |= B
T.add_mand(cur, A)
# handle caching
cached_tr_cnf = T
return T
def trans_rel_CNF():
global cached_tr_cnf
# we create a fake latch for the error
introduce_error_latch()
if cached_tr_cnf is not None:
return cached_tr_cnf
# per latch, handle the next function
T = sat.CNF()
for l in iterate_latches():
# easy case, the latch just directly maps input or terminal
(ii, ll, a) = get_lit_type(l.next)
if not a:
if l.next == 0 or l.next == 1: # is it a terminal?
T.add_mand(get_primed_var(l.lit), [l.next])
else: # otherwise
x = strip_lit(l.next) * -1 if lit_is_negated(l.next)\
else strip_lit(l.next)
T.add_mand(get_primed_var(l.lit), [x])
else: # complicated case, l.next is an AND
if lit_is_negated(l.next):
A = set([strip_lit(l.next) * -1])
B = set([strip_lit(l.next)])
else:
(A, B) = get_mand(l.next)
T.add_mand(get_primed_var(l.lit), A)
pending = B
# handle CNF for each pending gate
while pending:
cur = pending.pop()
(A, B) = get_mand(cur)
pending |= B
T.add_mand(cur, A)
# handle caching
cached_tr_cnf = T
return T
def decompose(aig, argv):
if argv.decomp == 1:
if lit_is_negated(aig.error_fake_latch.next):
log.DBG_MSG("Decomposition opt possible (BIG OR case)")
(A, B) = aig.get_1l_land(strip_lit(aig.error_fake_latch.next))
return imap(lambda a: ConcGame(
BDDAIG(aig).short_error(a),
use_trans=argv.use_trans),
merge_some_signals(BDD.true(), A, aig, argv))
else:
(A, B) = aig.get_1l_land(aig.error_fake_latch.next)
if not B:
log.DBG_MSG("No decomposition opt possible")
return None
else:
log.DBG_MSG("Decomposition opt possible (A ^ [C v D] case)")
log.DBG_MSG(str(len(A)) + " AND leaves: " + str(A))
# critical heuristic: which OR leaf do we distribute?
# here I propose to choose the one with the most children
b = B.pop()
(C, D) = aig.get_1l_land(b)
for bp in B:
(Cp, Dp) = aig.get_1l_land(bp)
if len(Cp) > len(C):
b = bp
C = Cp
log.DBG_MSG("Chosen OR: " + str(b))
rem_AND_leaves = filter(lambda x: strip_lit(x) != b, A)
rdeps = set()
for r in rem_AND_leaves:
rdeps |= aig.get_lit_deps(strip_lit(r))
log.DBG_MSG("Rem. AND leaves' deps: " + str(rdeps))
cube = BDD.make_cube(map(aig.lit2bdd, rem_AND_leaves))
log.DBG_MSG(str(len(C)) + " OR leaves: " +
str(map(aig.get_lit_name, C)))
return imap(lambda a: ConcGame(
BDDAIG(aig).short_error(a),
use_trans=argv.use_trans), merge_some_signals(cube, C, aig,
argv))
elif argv.decomp == 2:
raise NotImplementedError
def decompose(aig, argv):
if argv.decomp == 1:
if lit_is_negated(aig.error_fake_latch.next):
log.DBG_MSG("Decomposition opt possible (BIG OR case)")
(A, B) = aig.get_1l_land(strip_lit(aig.error_fake_latch.next))
return imap(
lambda a: ConcGame(BDDAIG(aig).short_error(a),
use_trans=argv.use_trans),
merge_some_signals(BDD.true(), A, aig, argv))
else:
(A, B) = aig.get_1l_land(aig.error_fake_latch.next)
if not B:
log.DBG_MSG("No decomposition opt possible")
return None
else:
log.DBG_MSG("Decomposition opt possible (A ^ [C v D] case)")
log.DBG_MSG(str(len(A)) + " AND leaves: " + str(A))
# critical heuristic: which OR leaf do we distribute?
# here I propose to choose the one with the most children
b = B.pop()
(C, D) = aig.get_1l_land(b)
for bp in B:
(Cp, Dp) = aig.get_1l_land(bp)
if len(Cp) > len(C):
b = bp
C = Cp
log.DBG_MSG("Chosen OR: " + str(b))
rem_AND_leaves = filter(lambda x: strip_lit(x) != b, A)
rdeps = set()
for r in rem_AND_leaves:
rdeps |= aig.get_lit_deps(strip_lit(r))
log.DBG_MSG("Rem. AND leaves' deps: " + str(rdeps))
cube = BDD.make_cube(map(aig.lit2bdd, rem_AND_leaves))
log.DBG_MSG(
str(len(C)) + " OR leaves: " + str(map(aig.get_lit_name, C)))
return imap(
lambda a: ConcGame(BDDAIG(aig).short_error(a),
use_trans=argv.use_trans),
merge_some_signals(cube, C, aig, argv))
elif argv.decomp == 2:
raise NotImplementedError
def get_mand(lit):
(A, B) = get_1l_land(lit)
A2 = set(map(A, lambda x: strip_lit(x) * -1
if lit_is_negated(x)
else x))
return (A2, B)
def get_mand(lit):
(A, B) = get_1l_land(lit)
A2 = set(map(A, lambda x: strip_lit(x) * -1 if lit_is_negated(x) else x))
return (A2, B)