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https://github.com/Z3Prover/z3
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fix setup of path constraints when the path constraint is False
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@ -9904,21 +9904,44 @@ namespace smt {
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}
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lhs_terms.push_back(ctx.mk_eq_atom(mk_strlen(str), m_autil.mk_numeral(exact_length_value, true)));
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expr_ref lhs(mk_and(lhs_terms), m);
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// If the automaton was built with the same polarity as the constraint,
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// assert directly. Otherwise, negate the path constraint
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if ( (current_assignment == l_true && assumption.get_polarity())
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|| (current_assignment == l_false && !assumption.get_polarity())) {
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TRACE("str", tout << "automaton and regex term have same polarity" << std::endl;);
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expr_ref rhs(m.mk_and(pathConstraint, characterConstraints), m);
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assert_implication(lhs, rhs);
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// If the path constraint comes out as "false", this means there are no paths of that length
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// in the automaton. If the polarity is the same, we can assert a conflict clause.
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// If the polarity is opposite, we ignore the path constraint.
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if (m.is_false(pathConstraint)) {
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if ( (current_assignment == l_true && assumption.get_polarity())
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|| (current_assignment == l_false && !assumption.get_polarity())) {
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// automaton and constraint have same polarity -- assert conflict clause
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TRACE("str", tout << "path constraint is false with matching polarity; asserting conflict clause" << std::endl;);
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expr_ref conflict(m.mk_not(mk_and(lhs_terms)), m);
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assert_axiom(conflict);
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// don't set up "regex_terms_with_path_constraints" as a conflict clause is not a path constraint
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} else {
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// automaton and constraint have opposite polarity -- ignore path constraint
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TRACE("str", tout << "path constraint is false with opposite polarity; ignoring path constraint" << std::endl;);
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assert_implication(lhs, characterConstraints);
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regex_terms_with_path_constraints.insert(str_in_re);
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m_trail_stack.push(insert_obj_trail<theory_str, expr>(regex_terms_with_path_constraints, str_in_re));
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}
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regex_axiom_add = true;
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} else {
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TRACE("str", tout << "automaton and regex term have opposite polarity" << std::endl;);
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expr_ref rhs(m.mk_and(m.mk_not(pathConstraint), characterConstraints), m);
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assert_implication(lhs, rhs);
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// If the automaton was built with the same polarity as the constraint,
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// assert directly. Otherwise, negate the path constraint
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if ( (current_assignment == l_true && assumption.get_polarity())
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|| (current_assignment == l_false && !assumption.get_polarity())) {
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TRACE("str", tout << "automaton and regex term have same polarity" << std::endl;);
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expr_ref rhs(m.mk_and(pathConstraint, characterConstraints), m);
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assert_implication(lhs, rhs);
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} else {
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TRACE("str", tout << "automaton and regex term have opposite polarity" << std::endl;);
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expr_ref rhs(m.mk_and(m.mk_not(pathConstraint), characterConstraints), m);
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assert_implication(lhs, rhs);
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}
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regex_terms_with_path_constraints.insert(str_in_re);
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m_trail_stack.push(insert_obj_trail<theory_str, expr>(regex_terms_with_path_constraints, str_in_re));
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regex_axiom_add = true;
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}
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regex_terms_with_path_constraints.insert(str_in_re);
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m_trail_stack.push(insert_obj_trail<theory_str, expr>(regex_terms_with_path_constraints, str_in_re));
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regex_axiom_add = true;
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// increment LengthAttemptCount
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regex_inc_counter(regex_length_attempt_count, re);
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