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LRA tactic

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-03-06 08:29:29 -08:00
parent 75eca46d93
commit f9aeeeef36
4 changed files with 99 additions and 28 deletions
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113
src/muz_qe/pdr_context.cpp
View file

@ -723,24 +723,17 @@ namespace pdr {
m_closed = true;
}
expr_ref model_node::get_trace() const {
expr_ref model_node::get_trace(context const& ctx) {
pred_transformer& p = pt();
ast_manager& m = p.get_manager();
manager& pm = p.get_pdr_manager();
TRACE("pdr", model_smt2_pp(tout, m, get_model(), 0););
func_decl* f = p.head();
unsigned arity = f->get_arity();
model_ref model = get_model_ptr();
expr_ref_vector args(m);
expr_ref v(m);
model_evaluator mev(m);
for (unsigned i = 0; i < arity; ++i) {
v = m.mk_const(pm.o2n(p.sig(i),0));
expr_ref e = mev.eval(model, v);
args.push_back(e);
}
return expr_ref(m.mk_app(f, args.size(), args.c_ptr()), m);
datalog::context& dctx = ctx.get_context();
datalog::rule_manager& rm = dctx.get_rule_manager();
datalog::rule_ref r0(rm), r1(rm);
expr_ref_vector binding(m);
expr_ref fml(m);
mk_instantiate(r0, r1, binding);
r1->to_formula(fml);
return fml;
}
static bool is_ini(datalog::rule const& r) {
@ -961,21 +954,95 @@ namespace pdr {
return out;
}
expr_ref model_search::get_trace() const {
expr_ref model_search::get_trace(context const& ctx) const {
pred_transformer& pt = get_root().pt();
ast_manager& m = pt.get_manager();
manager& pm = pt.get_pdr_manager();
expr_ref result(m.mk_true(),m);
expr_ref_vector rules(m);
ptr_vector<model_node> nodes;
nodes.push_back(m_root);
expr_ref_vector binding(m);
ptr_vector<model_node> todo;
datalog::rule_ref r0(rm), r1(rm), r2(rm);
model_node* n = m_root;
todo.push_back(n);
while (!todo.empty()) {
n = todo.back();
ptr_vector<model_node> const& chs = n->children();
rls.push_back(0);
for (unsigned i = 0; i < chs.size(); ++i) {
todo.push_back(chs[i]);
}
if (!chs.empty()) {
continue;
}
expr_ref fml0(m);
binding.reset();
n->mk_instantiate(r0, r1, binding);
r0->to_formula(fml0);
datalog::rule_ref reduced_rule(rm), r3(rm);
reduced_rule = rls[0];
// check if binding is identity.
bool binding_is_id = true;
for (unsigned i = 0; binding_is_id && i < binding.size(); ++i) {
expr* v = binding[i].get();
binding_is_id = is_var(v) && to_var(v)->get_idx() == i;
}
if (rls.size() > 1 || !binding_is_id) {
expr_ref tmp(m);
vector<expr_ref_vector> substs;
svector<std::pair<unsigned,unsigned> > positions;
substs.push_back(binding); // TODO base substitution.
for (unsigned i = 1; i < rls.size(); ++i) {
datalog::rule& src = *rls[i];
bool unified = unifier.unify_rules(*reduced_rule, 0, src);
if (!unified) {
IF_VERBOSE(0,
verbose_stream() << "Could not unify rules: ";
reduced_rule->display(dctx, verbose_stream());
src.display(dctx, verbose_stream()););
}
expr_ref_vector sub1 = unifier.get_rule_subst(*reduced_rule, true);
TRACE("pdr",
for (unsigned k = 0; k < sub1.size(); ++k) {
tout << mk_pp(sub1[k].get(), m) << " ";
}
tout << "\n";
);
for (unsigned j = 0; j < substs.size(); ++j) {
for (unsigned k = 0; k < substs[j].size(); ++k) {
var_subst(m, false)(substs[j][k].get(), sub1.size(), sub1.c_ptr(), tmp);
substs[j][k] = tmp;
}
while (substs[j].size() < sub1.size()) {
substs[j].push_back(sub1[substs[j].size()].get());
}
}
positions.push_back(std::make_pair(i,0));
substs.push_back(unifier.get_rule_subst(src, false));
VERIFY(unifier.apply(*reduced_rule.get(), 0, src, r3));
reduced_rule = r3;
}
expr_ref fml_concl(m);
reduced_rule->to_formula(fml_concl);
p1 = m.mk_hyper_resolve(pfs.size(), pfs.c_ptr(), fml_concl, positions, substs);
}
cache.insert(n->state(), p1);
rules.insert(n->state(), reduced_rule);
trail.push_back(p1);
rules_trail.push_back(reduced_rule);
todo.pop_back();
}
while (!nodes.empty()) {
model_node* current = nodes.back();
nodes.pop_back();
rules.push_back(current->get_trace());
rules.push_back(current->get_trace(ctx));
nodes.append(current->children());
}
return pm.mk_and(rules);
return expr_ref(m.mk_and(rules.size(), rules.c_ptr()), m);
}
proof_ref model_search::get_proof_trace(context const& ctx) const {
@ -1594,7 +1661,7 @@ namespace pdr {
proof_ref pr = get_proof();
return expr_ref(pr.get(), m);
}
return m_search.get_trace();
return m_search.get_trace(*this);
}
expr_ref context::mk_unsat_answer() const {

4
src/muz_qe/pdr_context.h
View file

@ -223,7 +223,7 @@ namespace pdr {
void set_rule(datalog::rule const* r) { m_rule = r; }
datalog::rule* get_rule();
expr_ref get_trace() const;
expr_ref get_trace(context const& ctx);
void mk_instantiate(datalog::rule_ref& r0, datalog::rule_ref& r1, expr_ref_vector& binding);
std::ostream& display(std::ostream& out, unsigned indent);
@ -253,7 +253,7 @@ namespace pdr {
void set_root(model_node* n);
model_node& get_root() const { return *m_root; }
std::ostream& display(std::ostream& out) const;
expr_ref get_trace() const;
expr_ref get_trace(context const& ctx) const;
proof_ref get_proof_trace(context const& ctx) const;
void backtrack_level(bool uses_level, model_node& n);
};

2
src/muz_qe/qe_sat_tactic.h
View file

@ -26,7 +26,7 @@ Revision History:
namespace qe {
tactic * mk_sat_tactic(ast_manager& m, params_ref const& p);
tactic * mk_sat_tactic(ast_manager& m, params_ref const& p = params_ref());
};
/*