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fix bugs reported by phan

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-12-17 04:20:24 +02:00
parent 1bcf5b8b5f
commit 56b9c4c8a2
2 changed files with 48 additions and 12 deletions

46
src/opt/weighted_maxsat.cpp
View file

@ -36,6 +36,8 @@ namespace smt {
rational m_min_cost; // current maximal cost assignment.
u_map<theory_var> m_bool2var; // bool_var -> theory_var
svector<bool_var> m_var2bool; // theory_var -> bool_var
bool m_propagate;
svector<bool> m_assigned;
public:
theory_weighted_maxsat(ast_manager& m, opt::opt_solver& s):
@ -43,7 +45,8 @@ namespace smt {
s(s),
m_vars(m),
m_fmls(m),
m_min_cost_atom(m)
m_min_cost_atom(m),
m_propagate(false)
{}
/**
@ -83,7 +86,8 @@ namespace smt {
context & ctx = get_context();
ast_manager& m = get_manager();
bool initialized = !m_var2bool.empty();
m_propagate = true;
for (unsigned i = 0; !initialized && i < m_vars.size(); ++i) {
app* var = m_vars[i].get();
bool_var bv;
@ -106,14 +110,6 @@ namespace smt {
m_var2bool.push_back(bv);
SASSERT(ctx.bool_var2enode(bv));
}
for (unsigned i = 0; i < m_vars.size(); ++i) {
app* var = m_vars[i].get();
bool_var bv = ctx.get_bool_var(var);
lbool asgn = ctx.get_assignment(bv);
if (asgn == l_true) {
assign_eh(bv, true);
}
}
if (!initialized && m_min_cost_atom) {
app* var = m_min_cost_atom;
@ -141,6 +137,7 @@ namespace smt {
m_weights.push_back(w);
m_vars.push_back(var);
m_fmls.push_back(fml);
m_assigned.push_back(false);
m_min_cost += w;
}
@ -167,11 +164,14 @@ namespace smt {
if (is_true) {
context& ctx = get_context();
theory_var tv = m_bool2var[v];
if (m_assigned[tv]) return;
rational const& w = m_weights[tv];
ctx.push_trail(value_trail<context, rational>(m_cost));
ctx.push_trail(push_back_vector<context, svector<theory_var> >(m_costs));
ctx.push_trail(value_trail<context, bool>(m_assigned[tv]));
m_cost += w;
m_costs.push_back(tv);
m_assigned[tv] = true;
if (m_cost > m_min_cost) {
block();
}
@ -206,6 +206,8 @@ namespace smt {
m_bool2var.reset();
m_var2bool.reset();
m_min_cost_atom = 0;
m_propagate = false;
m_assigned.reset();
}
virtual theory * mk_fresh(context * new_ctx) { return 0; }
@ -214,6 +216,24 @@ namespace smt {
virtual void new_eq_eh(theory_var v1, theory_var v2) { }
virtual void new_diseq_eh(theory_var v1, theory_var v2) { }
virtual bool can_propagate() {
return m_propagate;
}
virtual void propagate() {
context& ctx = get_context();
for (unsigned i = 0; m_propagate && i < m_vars.size(); ++i) {
bool_var bv = m_var2bool[i];
lbool asgn = ctx.get_assignment(bv);
if (asgn == l_true) {
assign_eh(bv, true);
}
}
m_propagate = false;
}
bool is_optimal() const {
return m_cost < m_min_cost;
}
@ -386,6 +406,7 @@ namespace opt {
lbool is_sat = l_true;
{
solver::scoped_push _s(s);
bool was_sat = false;
for (unsigned i = 0; i < m_soft.size(); ++i) {
wth.assert_weighted(m_soft[i].get(), m_weights[i]);
}
@ -397,10 +418,13 @@ namespace opt {
}
expr_ref fml = wth.mk_block();
s.assert_expr(fml);
was_sat = true;
}
}
if (is_sat == l_false) {
if (was_sat) {
wth.get_assignment(m_assignment);
}
if (is_sat == l_false && was_sat) {
is_sat = l_true;
}
}

14
src/smt/theory_pb.cpp
View file

@ -983,7 +983,9 @@ namespace smt {
tout << "\n";
display(tout, c, true););
resolve_conflict(c);
if ((c.m_num_propagations & 0xF) == 0) {
resolve_conflict(c);
}
justification* js = 0;
ctx.mk_clause(lits.size(), lits.c_ptr(), js, CLS_AUX_LEMMA, 0);
@ -1029,6 +1031,16 @@ namespace smt {
if (ctx.get_assignment(l) != l_false) {
m_lemma.m_k -= coeff;
if (false && is_marked(v)) {
SASSERT(ctx.get_assignment(l) == l_true);
numeral& lcoeff = m_lemma.m_args[m_conseq_index[v]].second;
lcoeff -= coeff;
if (!lcoeff.is_pos()) {
// perhaps let lemma simplification change coefficient
// when negative?
remove_from_lemma(m_lemma, m_conseq_index[v]);
}
}
}
else if (lvl > ctx.get_base_level()) {
if (is_marked(v)) {