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Fix problem reported at http://stackoverflow.com/questions/17215640/getting-concrete-values-from-a-model-containing-array-ext

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-06-20 17:48:43 -07:00
parent cd485f03dd
commit 185f125f7a
1 changed files with 35 additions and 1 deletions
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34
src/smt/smt_model_finder.cpp
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@ -103,6 +103,14 @@ namespace smt {
SASSERT(!m_manager.is_model_value(n));
}
void remove(expr * n) {
// We can only remove n if it is in m_elems, AND m_inv was not initialized yet.
SASSERT(m_elems.contains(n));
SASSERT(m_inv.empty());
m_elems.erase(n);
m_manager.dec_ref(n);
}
void display(std::ostream & out) const {
obj_map<expr, unsigned>::iterator it = m_elems.begin();
obj_map<expr, unsigned>::iterator end = m_elems.end();
@ -525,6 +533,30 @@ namespace smt {
}
}
// For each instantiation_set, reemove entries that do not evaluate to values.
void cleanup_instantiation_sets() {
ptr_vector<expr> to_delete;
ptr_vector<node>::const_iterator it = m_nodes.begin();
ptr_vector<node>::const_iterator end = m_nodes.end();
for (; it != end; ++it) {
node * curr = *it;
if (curr->is_root()) {
instantiation_set * s = curr->get_instantiation_set();
to_delete.reset();
obj_map<expr, unsigned> const & elems = s->get_elems();
for (obj_map<expr, unsigned>::iterator it = elems.begin(); it != elems.end(); it++) {
expr * n = it->m_key;
expr * n_val = eval(n, true);
if (!m_manager.is_value(n_val))
to_delete.push_back(n);
}
for (ptr_vector<expr>::iterator it = to_delete.begin(); it != to_delete.end(); it++) {
s->remove(*it);
}
}
}
}
void display_nodes(std::ostream & out) const {
display_key2node(out, m_uvars);
display_A_f_is(out);
@ -545,6 +577,7 @@ namespace smt {
r = 0;
else
r = tmp;
TRACE("model_finder", tout << "eval\n" << mk_pp(n, m_manager) << "\n----->\n" << mk_pp(r, m_manager) << "\n";);
m_eval_cache.insert(n, r);
m_eval_cache_range.push_back(r);
return r;
@ -1047,6 +1080,7 @@ namespace smt {
public:
void fix_model(expr_ref_vector & new_constraints) {
cleanup_instantiation_sets();
m_new_constraints = &new_constraints;
func_decl_set partial_funcs;
collect_partial_funcs(partial_funcs);