def flattenInstances(instances):
'''
sets the new polarities to corresponding ternary values
'''
for (sort, index) in instances.keys():
final_expr = mOr(SMTLib.SMT_BoolConst(False))
(l, h, _) = sort.instanceRanges[index]
(exprs, pols) = instances[(sort, index)]
final_polarity = Common.DEFINITELY_OFF
all_on = True
for i in range(l, h + 1):
currExpr = exprs.get(i)
currPol = pols.get(i)
if not (i in pols.keys()) or currPol == Common.DEFINITELY_OFF:
all_on = False
continue
elif currPol == Common.UNKNOWN:
all_on = False
final_polarity = Common.UNKNOWN
final_expr = mOr(final_expr, currExpr)
else:
final_polarity = Common.UNKNOWN
final_expr = mOr(final_expr, currExpr)
if all_on:
final_polarity = Common.DEFINITELY_ON
final_expr = SMTLib.SMT_BoolConst(True)
instances[(sort, index)] = (final_expr, final_polarity)
return instances
def op_union(left,right):
'''
:param left:
:type left: :class:`~ExprArg`
:param right:
:type right: :class:`~ExprArg`
:returns: :class:`~ExprArg`
Computes the set union (left ++ right)
'''
assert isinstance(left, ExprArg)
assert isinstance(right, ExprArg)
if left.getInts() or right.getInts():
sys.exit("FIXME ints union")
matches = getSetInstancePairs(left,right)
newInstances = {}
for (sort,index) in matches.keys():
key = (sort,index)
((lexpr,lpol),(rexpr,rpol)) = matches[(sort,index)]
if rpol == Common.DEFINITELY_OFF and lpol == Common.DEFINITELY_OFF:
continue
else:
new_expr = mOr(lexpr,rexpr)
newInstances[key] = (new_expr, Common.aggregate_polarity(lpol, rpol))
return ExprArg(newInstances)
def joinWithParent(arg):
instances = arg.getInstances(nonsupered=True)
newInstances = {}
for (sort, index) in instances.keys():
(expr, pol) = instances[(sort, index)]
if pol == Common.DEFINITELY_OFF:
continue
(lower, upper, _) = sort.instanceRanges[index]
for i in range(lower, min(sort.parentInstances, upper + 1)):
(old_expr, old_pol) = newInstances.get(
(sort.parent, i),
(SMTLib.SMT_BoolConst(False), Common.DEFINITELY_OFF))
if pol == Common.DEFINITELY_ON and lower == upper:
new_pol = Common.DEFINITELY_ON
new_expr = SMTLib.SMT_BoolConst(True)
else:
new_pol = Common.aggregate_polarity(old_pol, Common.UNKNOWN)
new_expr = mOr(
old_expr,
mAnd(
expr,
SMTLib.SMT_EQ(sort.instances[index],
SMTLib.SMT_IntConst(i))))
newInstances[(sort.parent, i)] = (new_expr, new_pol)
return ExprArg(newInstances, nonsupered=True)
def op_union(left, right):
'''
:param left:
:type left: :class:`~ExprArg`
:param right:
:type right: :class:`~ExprArg`
:returns: :class:`~ExprArg`
Computes the set union (left ++ right)
'''
assert isinstance(left, ExprArg)
assert isinstance(right, ExprArg)
if left.getInts() or right.getInts():
sys.exit("FIXME ints union")
matches = getSetInstancePairs(left, right)
newInstances = {}
for (sort, index) in matches.keys():
key = (sort, index)
((lexpr, lpol), (rexpr, rpol)) = matches[(sort, index)]
if rpol == Common.DEFINITELY_OFF and lpol == Common.DEFINITELY_OFF:
continue
else:
new_expr = mOr(lexpr, rexpr)
newInstances[key] = (new_expr,
Common.aggregate_polarity(lpol, rpol))
return ExprArg(newInstances)
def compute_int_set(instances):
cons = []
for index in range(len(instances)):
(i, c) = instances[index]
cons.append(
mAnd(
c, *[
mOr(SMTLib.createNot(jc), SMTLib.SMT_NE(j, i))
for (j, jc) in instances[0:index]
]))
return cons
def addMatchValues(matches, instances, left=True):
'''
Ignores PrimitiveSorts
'''
for (sort, index) in instances.keys():
(expr,polarity) = instances[(sort,index)]
#!!!
default = (SMTLib.SMT_BoolConst(False), Common.DEFINITELY_OFF)
(prev_left, prev_right) = matches.get((sort,index), (default,default))
if left:
(prev_expr, prev_pol) = prev_left
new_left = (mOr(expr, prev_expr), Common.aggregate_polarity(polarity, prev_pol))
new_right = prev_right
else:
(prev_expr, prev_pol) = prev_right
new_left = prev_left
new_right = (mOr(expr, prev_expr), Common.aggregate_polarity(polarity, prev_pol))
matches[(sort,index)] = (new_left,new_right)
return matches
def addMatchValues(matches, instances, left=True):
'''
Ignores PrimitiveSorts
'''
for (sort, index) in instances.keys():
(expr, polarity) = instances[(sort, index)]
#!!!
default = (SMTLib.SMT_BoolConst(False), Common.DEFINITELY_OFF)
(prev_left, prev_right) = matches.get((sort, index),
(default, default))
if left:
(prev_expr, prev_pol) = prev_left
new_left = (mOr(expr, prev_expr),
Common.aggregate_polarity(polarity, prev_pol))
new_right = prev_right
else:
(prev_expr, prev_pol) = prev_right
new_left = prev_left
new_right = (mOr(expr, prev_expr),
Common.aggregate_polarity(polarity, prev_pol))
matches[(sort, index)] = (new_left, new_right)
return matches
def op_or(left,right):
'''
:param left:
:type left: :class:`~ExprArg`
:param right:
:type right: :class:`~ExprArg`
:returns: :class:`~BoolArg`
Computes the boolean disjunction of the left and right instances.
'''
assert isinstance(left, ExprArg)
assert isinstance(right, ExprArg)
lval = left.getBool()
rval = right.getBool()
return BoolArg(mOr(lval, rval))
def getInstances(self, nonsupered=False):
if nonsupered or self.hasBeenSupered:
return self.clafers
else:
newClafers = {}
for (sort, index) in self.clafers.keys():
(expr, polarity) = self.clafers[(sort,index)]
if polarity == Common.DEFINITELY_OFF:
continue
key = (sort.highestSuperSort, sort.indexInHighestSuper + index)
if polarity == Common.DEFINITELY_ON:
newClafers[key] = (SMTLib.SMT_BoolConst(True), Common.DEFINITELY_ON)
continue
(currEntry, currPolarity) = newClafers.get(key, (SMTLib.SMT_BoolConst(False), Common.DEFINITELY_OFF))
currEntry = mOr(currEntry, expr)
newClafers[key] = (currEntry, Common.aggregate_polarity(currPolarity, polarity))
self.clafers = newClafers
self.hasBeenSupered = True
return self.clafers
def getQuantifierConditionList(exprs):
'''
Iterates over all values in all masks,
and returns a list of Booleans, indicating whether
each instance is on (or true), or not.
'''
finalList = []
for i in exprs:
for expr in i:
if isinstance(expr, BoolArg):
finalList.append(expr.getBool())
continue
condList = []
for k in expr.getInstances().values():
(e, pol) = k
if pol != Common.DEFINITELY_ON:
condList.append(e)
else:
condList.append(SMTLib.SMT_BoolConst(True))
break
finalList.append(mOr(*condList))
return finalList
def getQuantifierConditionList(exprs):
'''
Iterates over all values in all masks,
and returns a list of Booleans, indicating whether
each instance is on (or true), or not.
'''
finalList = []
for i in exprs:
for expr in i:
if isinstance(expr, BoolArg):
finalList.append(expr.getBool())
continue
condList = []
for k in expr.getInstances().values():
(e, pol) = k
if pol != Common.DEFINITELY_ON:
condList.append(e)
else:
condList.append(SMTLib.SMT_BoolConst(True))
break
finalList.append(mOr(*condList))
return finalList
def getInstances(self, nonsupered=False):
if nonsupered or self.hasBeenSupered:
return self.clafers
else:
newClafers = {}
for (sort, index) in self.clafers.keys():
(expr, polarity) = self.clafers[(sort, index)]
if polarity == Common.DEFINITELY_OFF:
continue
key = (sort.highestSuperSort, sort.indexInHighestSuper + index)
if polarity == Common.DEFINITELY_ON:
newClafers[key] = (SMTLib.SMT_BoolConst(True),
Common.DEFINITELY_ON)
continue
(currEntry, currPolarity) = newClafers.get(
key, (SMTLib.SMT_BoolConst(False), Common.DEFINITELY_OFF))
currEntry = mOr(currEntry, expr)
newClafers[key] = (currEntry,
Common.aggregate_polarity(
currPolarity, polarity))
self.clafers = newClafers
self.hasBeenSupered = True
return self.clafers
def joinWithClaferRef(arg):
instances = arg.getInstances(nonsupered=True)
newArg = ExprArg(nonsupered=True)
for (sort, index) in instances.keys():
(expr, pol) = instances[(sort, index)]
while not sort.refSort:
(sort, index) = joinWithSuper(sort, index)
if isinstance(sort.refSort, PrimitiveType):
joinWithPrimitive(newArg, sort, index, expr, pol)
else:
for i in range(sort.refSort.numInstances):
(prev_expr, _) = newArg.getInstances(nonsupered=True).get(
(sort.refSort, i),
(SMTLib.SMT_BoolConst(False), Common.DEFINITELY_OFF))
newArg.getInstances(nonsupered=True)[(sort.refSort, i)] = (mOr(
prev_expr,
mAnd(
expr,
SMTLib.SMT_EQ(
sort.refs[index],
SMTLib.SMT_IntConst(i)))), Common.UNKNOWN)
return newArg
def op_eq(left,right, cacheJoins=False, bc = None):
'''
:param left:
:type left: :class:`~ExprArg`
:param right:
:type right: :class:`~ExprArg`
:returns: :class:`~BoolArg`
Ensures that the left = right.
'''
assert isinstance(left, ExprArg)
assert isinstance(right, ExprArg)
if cacheJoins and bc:
#TODO CLEAN
left_key = None
right_key = None
keys = []
#asil allocation speedup, if both sides are sets, we can perform expression substitution in other constraints
#bc is the bracketed constraint to put the cache
for i in [left,right]:
if isinstance(i, JoinArg):
newkeys = Common.computeCacheKeys(i.flattenJoin())
#print(tuple(key))
keys = keys + newkeys
#need to return all keys during the progress of join, add flag?
#get the all keys
all_keys = i.checkIfJoinIsComputed(nonsupered=True, getAllKeys = True)
#print(keys)
#print(all_keys)
keys = keys+all_keys
#sys.exit()
#print()
#print("GGGG right" + str(right.__class__))
#print(right.clafers)
if len(left.clafers) != len(right.clafers):
minJoinVal = left.clafers if len(left.clafers) < len(right.clafers) else right.clafers
for i in keys:
#TODO make more robust (e.g. if multiple equalities exist for the same join key, aggregate expressions
bc.cache[i] = ExprArg(minJoinVal)
#print(i)
#print(minJoinVal)
#print(str(len(minJoinVal)) + " " + str(len(left.clafers)) + " " + str(len(right.clafers)))
#print(str(len(left.clafers)) + " " + str(len(right.clafers)))
cond = []
#int equality case
lints = [(e,c) for (e,c) in left.getInts() if str(c) != "False"]
rints = [(e,c) for (e,c) in right.getInts() if str(c) != "False"]
if lints or rints:
for (e,c) in lints:
#exists r in R s.t. e == r
expr = mOr(*[mAnd(rc, SMTLib.SMT_EQ(e,r)) for (r,rc) in rints])
if str(c) != "True":
expr = SMTLib.SMT_Implies(c, expr)
cond.append(expr)
for (e,c) in rints:
#exists l in L s.t. e == l
expr = mOr(*[mAnd(lc, SMTLib.SMT_EQ(e,l)) for (l,lc) in lints])
if str(c) != "True":
expr = SMTLib.SMT_Implies(c, expr)
cond.append(expr)
#clafer-set equality case
matches = getSetInstancePairs(left,right)
for ((lexpr, lpol),(rexpr, rpol)) in matches.values():
if lpol == Common.DEFINITELY_OFF and rpol == Common.DEFINITELY_OFF:
continue
elif lpol == Common.DEFINITELY_OFF:
cond.append(SMTLib.createNot(rexpr))
elif rpol == Common.DEFINITELY_OFF:
cond.append(SMTLib.createNot(lexpr))
else:
cond.append(SMTLib.SMT_Implies(lexpr, rexpr))
cond.append(SMTLib.SMT_Implies(rexpr, lexpr))
return BoolArg(mAnd(*cond))
def quant_no(exprs, ifConstraints):
condList = getQuantifierConditionList(exprs)
if ifConstraints:
condList = [mAnd(i, j) for i,j in zip(ifConstraints, condList)]
return SMTLib.createNot(mOr(*condList))
def quant_some(exprs, ifConstraints):
condList = getQuantifierConditionList(exprs)
if ifConstraints:
condList = [mAnd(i, j) for i, j in zip(ifConstraints, condList)]
return mOr(*condList)
def quant_no(exprs, ifConstraints):
condList = getQuantifierConditionList(exprs)
if ifConstraints:
condList = [mAnd(i, j) for i, j in zip(ifConstraints, condList)]
return SMTLib.createNot(mOr(*condList))
def compute_int_set(instances):
cons = []
for index in range(len(instances)):
(i,c) = instances[index]
cons.append(mAnd(c, *[mOr(SMTLib.createNot(jc), SMTLib.SMT_NE(j,i)) for (j, jc) in instances[0:index]]))
return cons
def addRefConstraints(self):
if not self.refSort:
return
elif isinstance(self.refSort, PrimitiveType) and self.refSort.type == "real":
self.refs = SMTLib.SMT_RealVector(self.element.uid + "_ref",self.numInstances)
elif isinstance(self.refSort, PrimitiveType):
self.refs = SMTLib.SMT_IntVector(self.element.uid + "_ref",self.numInstances)
else:
self.refs = SMTLib.SMT_IntVector(self.element.uid + "_ref",self.numInstances,
bits=self.getBits(self.refSort.parentInstances+1))
if not isinstance(self.refSort, PrimitiveType):
for i in range(self.numInstances):
#refs pointer is >= 0
self.constraints.addRefConstraint(SMTLib.SMT_GE(self.refs[i], SMTLib.SMT_IntConst(0)))
#ref pointer is <= upper card of ref parent
self.constraints.addRefConstraint(SMTLib.SMT_LE(self.refs[i], SMTLib.SMT_IntConst(self.refSort.numInstances)))
#if integer refs, zero out refs that do not have live parents,
#if clafer refs, set equal to ref.parentInstances if not live
#reference symmetry breaking
if not self.element.isAbstract:
for i in range(self.numInstances - 1):
for j in range(i+1, self.numInstances):
if isinstance(self.refSort, PrimitiveType):
self.constraints.addRefConstraint(SMTLib.SMT_Implies(SMTLib.SMT_EQ(self.instances[i],self.instances[j]),
SMTLib.SMT_LE(self.refs[i], self.refs[j])))
else:
self.constraints.addRefConstraint(SMTLib.SMT_Implies(mAnd(SMTLib.SMT_NE(self.refs[i], SMTLib.SMT_IntConst(self.refSort.numInstances)),
SMTLib.SMT_EQ(self.instances[i], self.instances[j])),
SMTLib.SMT_LE(self.refs[i], self.refs[j])))
for i in range(self.numInstances):
if isinstance(self.refSort, PrimitiveType):
if self.refSort == "integer":
self.constraints.addRefConstraint(SMTLib.SMT_Implies(self.isOff(i),
SMTLib.SMT_EQ(self.refs[i], SMTLib.SMT_IntConst(0))),
self.known_polarity(i, local=True) != Common.DEFINITELY_ON)
elif self.refSort == "string":
if Options.STRING_CONSTRAINTS:
self.constraints.addRefConstraint(SMTLib.SMT_Implies(self.isOff(i), SMTLib.SMT_EQ(self.refs[i], self.cfr.EMPTYSTRING)),
self.known_polarity(i, local=True) != Common.DEFINITELY_ON)
else:
self.constraints.addRefConstraint(SMTLib.SMT_Implies(self.isOff(i), SMTLib.SMT_EQ(self.refs[i], SMTLib.SMT_IntConst(0))),
self.known_polarity(i, local=True) != Common.DEFINITELY_ON)
else:
self.constraints.addRefConstraint(SMTLib.SMT_Implies(self.isOff(i), SMTLib.SMT_EQ(self.refs[i], SMTLib.SMT_IntConst(0))),
self.known_polarity(i, local=True) != Common.DEFINITELY_ON)
else:
if self.known_polarity(i, local=True) != Common.DEFINITELY_ON:
self.constraints.addRefConstraint(SMTLib.SMT_If(self.isOff(i)
, SMTLib.SMT_EQ(self.refs[i], SMTLib.SMT_IntConst(self.refSort.numInstances))
, SMTLib.SMT_NE(self.refs[i], SMTLib.SMT_IntConst(self.refSort.numInstances))))
else:
self.constraints.addRefConstraint(SMTLib.SMT_NE(self.refs[i], SMTLib.SMT_IntConst(self.refSort.numInstances)))
#if refsort.full does not exist, create it
if not self.refSort.full:
self.refSort.full = lambda x:mOr(*[SMTLib.SMT_And(SMTLib.SMT_EQ(x, SMTLib.SMT_IntConst(i)), self.refSort.isOn(i)) for i in range(self.refSort.numInstances)])
#the clafer that the reference points to must be "on"
self.constraints.addRefConstraint(SMTLib.SMT_Implies(SMTLib.SMT_NE(self.refs[i], SMTLib.SMT_IntConst(self.refSort.numInstances)),
self.refSort.full(self.refs[i])))
def quant_some(exprs, ifConstraints):
condList = getQuantifierConditionList(exprs)
if ifConstraints:
condList = [mAnd(i, j) for i,j in zip(ifConstraints, condList)]
return mOr(*condList)
def addRefConstraints(self):
if not self.refSort:
return
elif isinstance(self.refSort,
PrimitiveType) and self.refSort.type == "real":
self.refs = SMTLib.SMT_RealVector(self.element.uid + "_ref",
self.numInstances)
elif isinstance(self.refSort, PrimitiveType):
self.refs = SMTLib.SMT_IntVector(self.element.uid + "_ref",
self.numInstances)
else:
self.refs = SMTLib.SMT_IntVector(
self.element.uid + "_ref",
self.numInstances,
bits=self.getBits(self.refSort.parentInstances + 1))
if not isinstance(self.refSort, PrimitiveType):
for i in range(self.numInstances):
#refs pointer is >= 0
self.constraints.addRefConstraint(
SMTLib.SMT_GE(self.refs[i], SMTLib.SMT_IntConst(0)))
#ref pointer is <= upper card of ref parent
self.constraints.addRefConstraint(
SMTLib.SMT_LE(
self.refs[i],
SMTLib.SMT_IntConst(self.refSort.numInstances)))
#if integer refs, zero out refs that do not have live parents,
#if clafer refs, set equal to ref.parentInstances if not live
#reference symmetry breaking
if not self.element.isAbstract:
for i in range(self.numInstances - 1):
for j in range(i + 1, self.numInstances):
if isinstance(self.refSort, PrimitiveType):
self.constraints.addRefConstraint(
SMTLib.SMT_Implies(
SMTLib.SMT_EQ(self.instances[i],
self.instances[j]),
SMTLib.SMT_LE(self.refs[i], self.refs[j])))
else:
self.constraints.addRefConstraint(
SMTLib.SMT_Implies(
mAnd(
SMTLib.SMT_NE(
self.refs[i],
SMTLib.SMT_IntConst(
self.refSort.numInstances)),
SMTLib.SMT_EQ(self.instances[i],
self.instances[j])),
SMTLib.SMT_LE(self.refs[i], self.refs[j])))
for i in range(self.numInstances):
if isinstance(self.refSort, PrimitiveType):
if self.refSort == "integer":
self.constraints.addRefConstraint(
SMTLib.SMT_Implies(
self.isOff(i),
SMTLib.SMT_EQ(self.refs[i],
SMTLib.SMT_IntConst(0))),
self.known_polarity(i, local=True) !=
Common.DEFINITELY_ON)
elif self.refSort == "string":
if Options.STRING_CONSTRAINTS:
self.constraints.addRefConstraint(
SMTLib.SMT_Implies(
self.isOff(i),
SMTLib.SMT_EQ(self.refs[i],
self.cfr.EMPTYSTRING)),
self.known_polarity(i, local=True) !=
Common.DEFINITELY_ON)
else:
self.constraints.addRefConstraint(
SMTLib.SMT_Implies(
self.isOff(i),
SMTLib.SMT_EQ(self.refs[i],
SMTLib.SMT_IntConst(0))),
self.known_polarity(i, local=True) !=
Common.DEFINITELY_ON)
else:
self.constraints.addRefConstraint(
SMTLib.SMT_Implies(
self.isOff(i),
SMTLib.SMT_EQ(self.refs[i],
SMTLib.SMT_IntConst(0))),
self.known_polarity(i, local=True) !=
Common.DEFINITELY_ON)
else:
if self.known_polarity(i, local=True) != Common.DEFINITELY_ON:
self.constraints.addRefConstraint(
SMTLib.SMT_If(
self.isOff(i),
SMTLib.SMT_EQ(
self.refs[i],
SMTLib.SMT_IntConst(
self.refSort.numInstances)),
SMTLib.SMT_NE(
self.refs[i],
SMTLib.SMT_IntConst(
self.refSort.numInstances))))
else:
self.constraints.addRefConstraint(
SMTLib.SMT_NE(
self.refs[i],
SMTLib.SMT_IntConst(self.refSort.numInstances)))
#if refsort.full does not exist, create it
if not self.refSort.full:
self.refSort.full = lambda x: mOr(*[
SMTLib.SMT_And(
SMTLib.SMT_EQ(x, SMTLib.SMT_IntConst(i)),
self.refSort.isOn(i))
for i in range(self.refSort.numInstances)
])
#the clafer that the reference points to must be "on"
self.constraints.addRefConstraint(
SMTLib.SMT_Implies(
SMTLib.SMT_NE(
self.refs[i],
SMTLib.SMT_IntConst(self.refSort.numInstances)),
self.refSort.full(self.refs[i])))
def op_eq(left, right, cacheJoins=False, bc=None):
'''
:param left:
:type left: :class:`~ExprArg`
:param right:
:type right: :class:`~ExprArg`
:returns: :class:`~BoolArg`
Ensures that the left = right.
'''
assert isinstance(left, ExprArg)
assert isinstance(right, ExprArg)
if cacheJoins and bc:
#TODO CLEAN
left_key = None
right_key = None
keys = []
#asil allocation speedup, if both sides are sets, we can perform expression substitution in other constraints
#bc is the bracketed constraint to put the cache
for i in [left, right]:
if isinstance(i, JoinArg):
newkeys = Common.computeCacheKeys(i.flattenJoin())
#print(tuple(key))
keys = keys + newkeys
#need to return all keys during the progress of join, add flag?
#get the all keys
all_keys = i.checkIfJoinIsComputed(nonsupered=True,
getAllKeys=True)
#print(keys)
#print(all_keys)
keys = keys + all_keys
#sys.exit()
#print()
#print("GGGG right" + str(right.__class__))
#print(right.clafers)
if len(left.clafers) != len(right.clafers):
minJoinVal = left.clafers if len(left.clafers) < len(
right.clafers) else right.clafers
for i in keys:
#TODO make more robust (e.g. if multiple equalities exist for the same join key, aggregate expressions
bc.cache[i] = ExprArg(minJoinVal)
#print(i)
#print(minJoinVal)
#print(str(len(minJoinVal)) + " " + str(len(left.clafers)) + " " + str(len(right.clafers)))
#print(str(len(left.clafers)) + " " + str(len(right.clafers)))
cond = []
#int equality case
lints = [(e, c) for (e, c) in left.getInts() if str(c) != "False"]
rints = [(e, c) for (e, c) in right.getInts() if str(c) != "False"]
if lints or rints:
for (e, c) in lints:
#exists r in R s.t. e == r
expr = mOr(*[mAnd(rc, SMTLib.SMT_EQ(e, r)) for (r, rc) in rints])
if str(c) != "True":
expr = SMTLib.SMT_Implies(c, expr)
cond.append(expr)
for (e, c) in rints:
#exists l in L s.t. e == l
expr = mOr(*[mAnd(lc, SMTLib.SMT_EQ(e, l)) for (l, lc) in lints])
if str(c) != "True":
expr = SMTLib.SMT_Implies(c, expr)
cond.append(expr)
#clafer-set equality case
matches = getSetInstancePairs(left, right)
for ((lexpr, lpol), (rexpr, rpol)) in matches.values():
if lpol == Common.DEFINITELY_OFF and rpol == Common.DEFINITELY_OFF:
continue
elif lpol == Common.DEFINITELY_OFF:
cond.append(SMTLib.createNot(rexpr))
elif rpol == Common.DEFINITELY_OFF:
cond.append(SMTLib.createNot(lexpr))
else:
cond.append(SMTLib.SMT_Implies(lexpr, rexpr))
cond.append(SMTLib.SMT_Implies(rexpr, lexpr))
return BoolArg(mAnd(*cond))
