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track uses_level better as suggested by Arie Gurfinkel

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2012-11-28 13:43:58 -08:00
parent 1d9b090196
commit 2b0be76685
2 changed files with 13 additions and 12 deletions
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21
src/muz_qe/pdr_context.cpp
View file

@ -266,7 +266,7 @@ namespace pdr {
}
else if (is_invariant(tgt_level, curr, false, assumes_level)) {
add_property(curr, tgt_level); // assumes_level?tgt_level:infty_level
add_property(curr, assumes_level?tgt_level:infty_level);
TRACE("pdr", tout << "is invariant: "<< tgt_level << " " << mk_pp(curr, m) << "\n";);
src[i] = src.back();
src.pop_back();
@ -293,9 +293,6 @@ namespace pdr {
bool pred_transformer::add_property1(expr * lemma, unsigned lvl) {
if (is_infty_level(lvl)) {
if (m.is_false(lemma)) {
return false;
}
if (!m_invariants.contains(lemma)) {
TRACE("pdr", tout << "property1: " << head()->get_name() << " " << mk_pp(lemma, m) << "\n";);
m_invariants.push_back(lemma);
@ -410,7 +407,7 @@ namespace pdr {
add_property(result, level);
}
lbool pred_transformer::is_reachable(model_node& n, expr_ref_vector* core) {
lbool pred_transformer::is_reachable(model_node& n, expr_ref_vector* core, bool& uses_level) {
TRACE("pdr",
tout << "is-reachable: " << head()->get_name() << " level: " << n.level() << "\n";
tout << mk_pp(n.state(), m) << "\n";);
@ -427,6 +424,9 @@ namespace pdr {
tout << mk_pp(n.state(), m) << "\n";);
n.set_model(model);
}
else if (is_sat == l_false) {
uses_level = m_solver.assumes_level();
}
return is_sat;
}
@ -1640,7 +1640,8 @@ namespace pdr {
close_node(n);
}
else {
switch (expand_state(n, cube)) {
bool uses_level = true;
switch (expand_state(n, cube, uses_level)) {
case l_true:
if (n.level() == 0) {
TRACE("pdr", tout << "reachable\n";);
@ -1653,7 +1654,7 @@ namespace pdr {
break;
case l_false: {
core_generalizer::cores cores;
cores.push_back(std::make_pair(cube, true));
cores.push_back(std::make_pair(cube, uses_level));
for (unsigned i = 0; !cores.empty() && i < m_core_generalizers.size(); ++i) {
core_generalizer::cores new_cores;
@ -1666,7 +1667,7 @@ namespace pdr {
bool found_invariant = false;
for (unsigned i = 0; i < cores.size(); ++i) {
expr_ref_vector const& core = cores[i].first;
bool uses_level = cores[i].second;
uses_level = cores[i].second;
found_invariant = !uses_level || found_invariant;
expr_ref ncore(m_pm.mk_not_and(core), m);
TRACE("pdr", tout << "invariant state: " << (uses_level?"":"(inductive) ") << mk_pp(ncore, m) << "\n";);
@ -1690,8 +1691,8 @@ namespace pdr {
// return a property that blocks state and is implied by the
// predicate transformer (or some unfolding of it).
//
lbool context::expand_state(model_node& n, expr_ref_vector& result) {
return n.pt().is_reachable(n, &result);
lbool context::expand_state(model_node& n, expr_ref_vector& result, bool& uses_level) {
return n.pt().is_reachable(n, &result, uses_level);
}
void context::propagate(unsigned max_prop_lvl) {

4
src/muz_qe/pdr_context.h
View file

@ -140,7 +140,7 @@ namespace pdr {
bool propagate_to_next_level(unsigned level);
void add_property(expr * lemma, unsigned lvl); // add property 'p' to state at level.
lbool is_reachable(model_node& n, expr_ref_vector* core);
lbool is_reachable(model_node& n, expr_ref_vector* core, bool& uses_level);
bool is_invariant(unsigned level, expr* co_state, bool inductive, bool& assumes_level, expr_ref_vector* core = 0);
bool check_inductive(unsigned level, expr_ref_vector& state, bool& assumes_level);
@ -309,7 +309,7 @@ namespace pdr {
void close_node(model_node& n);
void check_pre_closed(model_node& n);
void expand_node(model_node& n);
lbool expand_state(model_node& n, expr_ref_vector& cube);
lbool expand_state(model_node& n, expr_ref_vector& cube, bool& uses_level);
void create_children(model_node& n);
expr_ref mk_sat_answer() const;
expr_ref mk_unsat_answer() const;