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add evaluation of array equalities to model evaluator

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-04-02 15:07:01 +02:00
parent f6aaa5cc8d
commit 03336ab9f2
3 changed files with 273 additions and 4 deletions
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87
src/model/model_evaluator.cpp
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@ -30,6 +30,7 @@ Revision History:
#include"fpa_rewriter.h"
#include"rewriter_def.h"
#include"cooperate.h"
#include"ast_pp.h"
struct evaluator_cfg : public default_rewriter_cfg {
@ -42,6 +43,7 @@ struct evaluator_cfg : public default_rewriter_cfg {
pb_rewriter m_pb_rw;
fpa_rewriter m_f_rw;
seq_rewriter m_seq_rw;
array_util m_ar;
unsigned long long m_max_memory;
unsigned m_max_steps;
bool m_model_completion;
@ -59,7 +61,8 @@ struct evaluator_cfg : public default_rewriter_cfg {
m_dt_rw(m),
m_pb_rw(m),
m_f_rw(m),
m_seq_rw(m) {
m_seq_rw(m),
m_ar(m) {
bool flat = true;
m_b_rw.set_flat(flat);
m_a_rw.set_flat(flat);
@ -146,6 +149,8 @@ struct evaluator_cfg : public default_rewriter_cfg {
st = m_f_rw.mk_eq_core(args[0], args[1], result);
else if (s_fid == m_seq_rw.get_fid())
st = m_seq_rw.mk_eq_core(args[0], args[1], result);
else if (fid == m_ar_rw.get_fid())
st = mk_array_eq(args[0], args[1], result);
if (st != BR_FAILED)
return st;
}
@ -182,6 +187,7 @@ struct evaluator_cfg : public default_rewriter_cfg {
return st;
}
bool get_macro(func_decl * f, expr * & def, quantifier * & q, proof * & def_pr) {
#define TRACE_MACRO TRACE("model_evaluator", tout << "get_macro for " << f->get_name() << " (model completion: " << m_model_completion << ")\n";);
@ -230,6 +236,85 @@ struct evaluator_cfg : public default_rewriter_cfg {
bool cache_results() const { return m_cache; }
br_status mk_array_eq(expr* a, expr* b, expr_ref& result) {
if (a == b) {
result = m().mk_true();
return BR_DONE;
}
vector<expr_ref_vector> stores;
expr_ref else1(m()), else2(m());
if (extract_array_func_interp(a, stores, else1) &&
extract_array_func_interp(b, stores, else2)) {
expr_ref_vector conj(m()), args1(m()), args2(m());
conj.push_back(m().mk_eq(else1, else2));
args1.push_back(a);
args2.push_back(b);
for (unsigned i = 0; i < stores.size(); ++i) {
args1.resize(1); args1.append(stores[i].size() - 1, stores[i].c_ptr());
args2.resize(1); args2.append(stores[i].size() - 1, stores[i].c_ptr());
expr* s1 = m_ar.mk_select(args1.size(), args1.c_ptr());
expr* s2 = m_ar.mk_select(args2.size(), args2.c_ptr());
conj.push_back(m().mk_eq(s1, s2));
}
result = m().mk_and(conj.size(), conj.c_ptr());
return BR_REWRITE_FULL;
}
return BR_FAILED;
}
bool extract_array_func_interp(expr* a, vector<expr_ref_vector>& stores, expr_ref& else_case) {
SASSERT(m_ar.is_array(a));
while (m_ar.is_store(a)) {
expr_ref_vector store(m());
store.append(to_app(a)->get_num_args()-1, to_app(a)->get_args()+1);
stores.push_back(store);
a = to_app(a)->get_arg(0);
}
if (m_ar.is_const(a)) {
else_case = to_app(a)->get_arg(0);
return true;
}
if (m_ar.is_as_array(a)) {
func_decl* f = m_ar.get_as_array_func_decl(to_app(a));
func_interp* g = m_model.get_func_interp(f);
unsigned sz = g->num_entries();
unsigned arity = f->get_arity();
for (unsigned i = 0; i < sz; ++i) {
expr_ref_vector store(m());
func_entry const* fe = g->get_entry(i);
store.append(arity, fe->get_args());
store.push_back(fe->get_result());
for (unsigned j = 0; j < store.size(); ++j) {
if (!is_ground(store[j].get())) {
TRACE("model_evaluator", tout << "could not extract array interpretation: " << mk_pp(a, m()) << "\n" << mk_pp(store[j].get(), m()) << "\n";);
return false;
}
}
stores.push_back(store);
}
else_case = g->get_else();
if (!else_case) {
TRACE("model_evaluator", tout << "no else case " << mk_pp(a, m()) << "\n";);
return false;
}
if (!is_ground(else_case)) {
TRACE("model_evaluator", tout << "non-ground else case " << mk_pp(a, m()) << "\n" << mk_pp(else_case, m()) << "\n";);
return false;
}
TRACE("model_evaluator", tout << "else case: " << mk_pp(else_case, m()) << "\n";);
return true;
}
TRACE("model_evaluator", tout << "no translation: " << mk_pp(a, m()) << "\n";);
return false;
}
};
template class rewriter_tpl<evaluator_cfg>;