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randomize generation of 'some value' for user sorts. #4557

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-07-01 16:34:09 -07:00
parent d91ca423ab
commit 655166b867
3 changed files with 14 additions and 2 deletions
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13
src/model/value_factory.cpp
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@ -18,6 +18,7 @@ Revision History:
--*/
#include "model/value_factory.h"
#include "ast/ast_pp.h"
value_factory::value_factory(ast_manager & m, family_id fid):
m_manager(m),
@ -81,7 +82,17 @@ expr * user_sort_factory::get_some_value(sort * s) {
m_sort2value_set.find(s, set);
SASSERT(set != 0);
SASSERT(!set->m_values.empty());
return *(set->m_values.begin());
unsigned nv = set->m_values.size();
random_gen rand(m_manager.get_num_asts());
unsigned n = 1;
expr* result = nullptr;
for (auto v : set->m_values) {
if (0 == (rand() % (n++)))
result = v;
if (n > 10)
break;
}
return result;
}
return simple_factory<unsigned>::get_some_value(s);
}

1
src/smt/smt_model_checker.cpp
View file

@ -359,6 +359,7 @@ namespace smt {
break;
model_ref cex;
m_aux_context->get_model(cex);
if (!add_instance(q, cex.get(), sks, true)) {
break;
}

2
src/smt/smt_model_finder.cpp
View file

@ -958,7 +958,7 @@ namespace smt {
ptr_vector<node> need_fresh;
for (node * n : m_root_nodes) {
SASSERT(n->is_root());
instantiation_set const * s = n->get_instantiation_set();
instantiation_set const * s = n->get_instantiation_set();
TRACE("model_finder", s->display(tout););
obj_map<expr, unsigned> const & elems = s->get_elems();
if (elems.empty()) {