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working with incremental depth

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-10-23 14:16:07 -07:00
parent aa6e1badf2
commit 67077d960e
8 changed files with 127 additions and 126 deletions
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47
src/smt/theory_recfun.cpp
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@ -34,7 +34,7 @@ namespace smt {
m_plugin(*reinterpret_cast<recfun_decl_plugin*>(m.get_plugin(get_family_id()))),
m_util(m_plugin.u()),
m_preds(m),
m_max_depth(2),
m_max_depth(0),
m_q_case_expand(),
m_q_body_expand()
{
@ -50,11 +50,15 @@ namespace smt {
return alloc(theory_recfun, new_ctx->get_manager());
}
void theory_recfun::init_search_eh() {
smt_params_helper p(ctx().get_params());
void theory_recfun::init(context* ctx) {
theory::init(ctx);
smt_params_helper p(ctx->get_params());
m_max_depth = p.recfun_depth();
if (m_max_depth < 2) m_max_depth = 2;
}
void theory_recfun::init_search_eh() {
}
bool theory_recfun::internalize_atom(app * atom, bool gate_ctx) {
TRACEFN(mk_pp(atom, m));
@ -199,26 +203,22 @@ namespace smt {
* retrieve depth associated with predicate or expression.
*/
unsigned theory_recfun::get_depth(expr* e) {
SASSERT(u().is_defined(e) || u().is_case_pred(e));
unsigned d = 0;
m_pred_depth.find(e, d);
TRACEFN("depth " << d << " " << mk_pp(e, m));
return d;
}
/**
* Update depth of subterms of e with respect to d.
*/
void theory_recfun::set_depth(unsigned d, expr* e) {
void theory_recfun::set_depth_rec(unsigned d, expr* e) {
struct insert_c {
theory_recfun& th;
unsigned m_depth;
insert_c(theory_recfun& th, unsigned d): th(th), m_depth(d) {}
void operator()(app* e) {
if (th.u().is_defined(e) && !th.m_pred_depth.contains(e)) {
th.m_pred_depth.insert(e, m_depth);
th.m_preds.push_back(e);
TRACEFN("depth " << m_depth << " : " << mk_pp(e, th.m));
}
}
void operator()(app* e) { th.set_depth(m_depth, e); }
void operator()(quantifier*) {}
void operator()(var*) {}
};
@ -226,6 +226,14 @@ namespace smt {
for_each_expr(proc, e);
}
void theory_recfun::set_depth(unsigned depth, expr* e) {
if ((u().is_defined(e) || u().is_case_pred(e)) && !m_pred_depth.contains(e)) {
m_pred_depth.insert(e, depth);
m_preds.push_back(e);
TRACEFN("depth " << depth << " : " << mk_pp(e, m));
}
}
/**
* if `is_true` and `v = C_f_i(t1...tn)`,
* then body-expand i-th case of `f(t1...tn)`
@ -250,7 +258,7 @@ namespace smt {
expr_ref new_body(m);
new_body = subst(e, args.size(), args.c_ptr());
ctx().get_rewriter()(new_body); // simplify
set_depth(depth + 1, new_body);
set_depth_rec(depth + 1, new_body);
return new_body;
}
@ -312,19 +320,23 @@ namespace smt {
SASSERT(e.m_def->is_fun_defined());
// add case-axioms for all case-paths
auto & vars = e.m_def->get_vars();
literal_vector preds;
for (recfun::case_def const & c : e.m_def->get_cases()) {
// applied predicate to `args`
app_ref pred_applied = c.apply_case_predicate(e.m_args);
// cut off cases below max-depth
unsigned depth = get_depth(e.m_lhs);
set_depth(depth, pred_applied);
SASSERT(u().owns_app(pred_applied));
literal concl = mk_literal(pred_applied);
preds.push_back(concl);
if (depth >= m_max_depth) {
assert_max_depth_limit(pred_applied);
continue;
}
SASSERT(u().owns_app(pred_applied));
literal concl = mk_literal(pred_applied);
literal_vector guards;
guards.push_back(concl);
@ -338,10 +350,11 @@ namespace smt {
ctx().mk_th_axiom(get_id(), guards);
if (c.is_immediate()) {
body_expansion be(e.m_lhs, c, e.m_args);
body_expansion be(pred_applied, c, e.m_args);
assert_body_axiom(be);
}
}
ctx().mk_th_axiom(get_id(), preds);
}
/**
@ -357,7 +370,7 @@ namespace smt {
auto & vars = d.get_vars();
auto & args = e.m_args;
SASSERT(is_standard_order(vars));
unsigned depth = get_depth(e.m_lhs);
unsigned depth = get_depth(e.m_pred);
expr_ref lhs(u().mk_fun_defined(d, args), m);
expr_ref rhs = apply_args(depth, vars, args, e.m_cdef->get_rhs());
@ -388,7 +401,7 @@ namespace smt {
}
void theory_recfun::add_theory_assumptions(expr_ref_vector & assumptions) {
if (u().has_def()) {
if (u().has_defs()) {
app_ref dlimit = m_util.mk_depth_limit_pred(m_max_depth);
TRACEFN("add_theory_assumption " << mk_pp(dlimit.get(), m));
assumptions.push_back(dlimit);