# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# Created on Jul 28, 2019
#
# @author: ballance
from vsc.model.constraint_model import ConstraintModel
from vsc.model.expr_bin_model import ExprBinModel
from vsc.model.bin_expr_type import BinExprType
from vsc.model.expr_fieldref_model import ExprFieldRefModel
from vsc.model.field_array_model import FieldArrayModel
[docs]class ConstraintUniqueModel(ConstraintModel):
def __init__(self, unique_l):
super().__init__()
self.unique_l = unique_l
self.expr = None
[docs] def build(self, btor, soft=False):
ret = None
# Elements in the unique list might be arrays
unique_l = []
for i in self.unique_l:
if isinstance(i, ExprFieldRefModel) and isinstance(i.fm, FieldArrayModel):
# Collect up the array elements
self._add_list_elems(unique_l, i.fm)
else:
unique_l.append(i)
if len(unique_l) > 1:
for i in range(len(unique_l)):
for j in range(i+1, len(unique_l)):
t = ExprBinModel(unique_l[i], BinExprType.Ne, unique_l[j])
from vsc.visitors import ModelPrettyPrinter
if ret is None:
ret = t.build(btor)
else:
ret = btor.And(t.build(btor), ret)
else:
# Size 0,1: Always true
ret = btor.Const(1, 1)
return ret
def _add_list_elems(self, unique_l, l : FieldArrayModel):
for f in l.field_l:
unique_l.append(ExprFieldRefModel(f))
[docs] def get_nodes(self, node_l):
node_l.append(self.expr.get_node())
[docs] def accept(self, visitor):
visitor.visit_constraint_unique(self)
[docs] def clone(self, deep=False)->'ConstraintModel':
ret = ConstraintUniqueModel(self.unique_l)
return ret