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Fix bug in weak abs

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Must ensure that weak model makes all summaries true. Otherwise,
it is possible to get stuck discovering the same lemma forever.
This commit is contained in:
Arie Gurfinkel 2018-06-08 23:37:16 -07:00
parent df7ab0e496
commit 8445e2a7a2
2 changed files with 8 additions and 3 deletions
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8
src/muz/spacer/spacer_context.cpp
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@ -1166,6 +1166,10 @@ expr_ref pred_transformer::get_origin_summary (model_evaluator_util &mev,
summary[i] = v;
}
// bail out of if the model is insufficient
if (!mev.is_true(summary))
return expr_ref(m);
// -- pick an implicant
expr_ref_vector lits(m);
compute_implicant_literals (mev, summary, lits);
@ -3722,6 +3726,10 @@ bool context::create_children(pob& n, datalog::rule const& r,
expr_ref sum(m);
sum = pt.get_origin_summary (mev, prev_level(n.level()),
j, reach_pred_used[j], &aux);
if (!sum) {
dealloc(deriv);
return false;
}
deriv->add_premise (pt, j, sum, reach_pred_used[j], aux);
}

3
src/muz/spacer/spacer_context.h
View file

@ -350,9 +350,6 @@ class pred_transformer {
};
typedef obj_map<datalog::rule const, expr*> rule2expr;
typedef obj_map<datalog::rule const, ptr_vector<app> > rule2apps;
typedef obj_map<expr, datalog::rule const*> expr2rule;
manager& pm; // spacer::manager
ast_manager& m; // ast_manager
context& ctx; // spacer::context