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update unstable branch with qhc changes that don't have dependencies

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2012-12-10 11:13:04 -08:00
parent 7f210d55be
commit 271c143de5
11 changed files with 1881 additions and 1059 deletions
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2361
src/muz_qe/dl_bmc_engine.cpp
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File diff suppressed because it is too large Load diff

72
src/muz_qe/dl_bmc_engine.h
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@ -35,83 +35,23 @@ namespace datalog {
ast_manager& m;
smt_params m_fparams;
smt::kernel m_solver;
obj_map<func_decl, sort*> m_pred2sort;
obj_map<sort, func_decl*> m_sort2pred;
obj_map<func_decl, func_decl*> m_pred2newpred;
obj_map<func_decl, ptr_vector<func_decl> > m_pred2args;
ast_ref_vector m_pinned;
rule_set m_rules;
func_decl_ref m_query_pred;
expr_ref m_answer;
volatile bool m_cancel;
proof_converter_ref m_pc;
sort_ref m_path_sort;
bv_util m_bv;
unsigned m_bit_width;
lbool check_query();
proof_ref get_proof(model_ref& md, app* trace, app* path);
void checkpoint();
void declare_datatypes();
void compile_nonlinear();
void mk_rule_vars_nonlinear(rule& r, unsigned rule_id, expr* trace_arg, expr* path_arg, expr_ref_vector& sub);
expr_ref mk_var_nonlinear(func_decl* pred, sort* s, unsigned idx, expr* path_arg, expr* trace_arg);
expr_ref mk_arg_nonlinear(func_decl* pred, unsigned idx, expr* path_arg, expr* trace_arg);
void mk_subst(rule& r, expr* path, app* trace, expr_ref_vector& sub);
class nonlinear_dt;
class nonlinear;
class qlinear;
class linear;
bool is_linear() const;
lbool check_nonlinear();
void setup_nonlinear();
bool check_model_nonlinear(model_ref& md, expr* trace);
void mk_answer_nonlinear(model_ref& md, expr_ref& trace, expr_ref& path);
func_decl_ref mk_predicate(func_decl* p);
func_decl_ref mk_rule(func_decl* p, unsigned rule_idx);
// linear check
lbool check_linear();
lbool check_linear(unsigned level);
void compile_linear();
void compile_linear(unsigned level);
void compile_linear(rule& r, unsigned level);
expr_ref mk_level_predicate(symbol const& name, unsigned level);
expr_ref mk_level_predicate(func_decl* p, unsigned level);
expr_ref mk_level_arg(func_decl* pred, unsigned idx, unsigned level);
expr_ref mk_level_rule(func_decl* p, unsigned rule_idx, unsigned level);
expr_ref mk_level_var(func_decl* pred, sort* s, unsigned rule_id, unsigned idx, unsigned level);
void get_model_linear(unsigned level);
void setup_linear();
void assert_expr(expr* e);
void mk_rule_vars(rule& r, unsigned level, unsigned rule_id, expr_ref_vector& sub);
// quantified linear check
void compile_qlinear();
void setup_qlinear();
lbool check_qlinear();
lbool get_model_qlinear();
sort_ref mk_index_sort();
var_ref mk_index_var();
void mk_qrule_vars(datalog::rule const& r, unsigned i, expr_ref_vector& sub);
expr_ref mk_q_var(func_decl* pred, sort* s, unsigned rule_id, unsigned idx);
expr_ref mk_q_arg(func_decl* pred, unsigned idx, bool is_current);
expr_ref mk_q_one();
expr_ref mk_q_num(unsigned i);
expr_ref eval_q(model_ref& model, expr* t, unsigned i);
expr_ref eval_q(model_ref& model, func_decl* f, unsigned i);
func_decl_ref mk_q_rule(func_decl* f, unsigned rule_id);
func_decl_ref mk_q_func_decl(func_decl* f);
public:
bmc(context& ctx);
@ -131,6 +71,10 @@ namespace datalog {
void reset_statistics();
expr_ref get_answer();
// direct access to (new) non-linear compiler.
void compile(rule_set const& rules, expr_ref_vector& fmls, unsigned level);
expr_ref compile_query(func_decl* query_pred, unsigned level);
};
};

2
src/muz_qe/dl_context.cpp
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@ -715,6 +715,8 @@ namespace datalog {
check_positive_predicates(r);
break;
case BMC_ENGINE:
check_positive_predicates(r);
break;
case QBMC_ENGINE:
check_existential_tail(r);
check_positive_predicates(r);

15
src/muz_qe/dl_mk_array_blast.cpp
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@ -18,7 +18,8 @@ Revision History:
--*/
#include "dl_mk_array_blast.h"
#include "expr_replacer.h"
#include "expr_safe_replace.h"
namespace datalog {
@ -54,9 +55,10 @@ namespace datalog {
unsigned tsz = r.get_tail_size();
expr_ref_vector conjs(m), new_conjs(m);
expr_ref tmp(m);
expr_substitution sub(m);
expr_safe_replace sub(m);
uint_set lhs_vars, rhs_vars;
bool change = false;
bool inserted = false;
for (unsigned i = 0; i < utsz; ++i) {
new_conjs.push_back(r.get_tail(i));
@ -81,6 +83,7 @@ namespace datalog {
}
else {
sub.insert(x, y);
inserted = true;
}
}
else {
@ -89,7 +92,7 @@ namespace datalog {
new_conjs.push_back(tmp);
}
}
if (sub.empty() && !change) {
if (!inserted && !change) {
rules.add_rule(&r);
return false;
}
@ -99,11 +102,9 @@ namespace datalog {
r.to_formula(fml1);
body = m.mk_and(new_conjs.size(), new_conjs.c_ptr());
head = r.get_head();
scoped_ptr<expr_replacer> replace = mk_default_expr_replacer(m);
replace->set_substitution(&sub);
(*replace)(body);
sub(body);
m_rewriter(body);
(*replace)(head);
sub(head);
m_rewriter(head);
fml2 = m.mk_implies(body, head);
rm.mk_rule(fml2, new_rules, r.name());

12
src/muz_qe/dl_mk_coalesce.cpp
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@ -60,7 +60,7 @@ namespace datalog {
obj_map<expr, unsigned> indices;
bool_rewriter bwr(m);
rule_ref r(const_cast<rule*>(&rl), rm);
sort_ref_vector sorts(m);
ptr_vector<sort> sorts;
expr_ref_vector revsub(m), conjs(m);
rl.get_vars(sorts);
revsub.resize(sorts.size());
@ -72,8 +72,8 @@ namespace datalog {
if (is_var(e)) {
unsigned v = to_var(e)->get_idx();
SASSERT(v < valid.size());
if (sorts[v].get()) {
SASSERT(s == sorts[v].get());
if (sorts[v]) {
SASSERT(s == sorts[v]);
if (valid[v]) {
revsub[v] = w;
valid[v] = false;
@ -92,8 +92,8 @@ namespace datalog {
}
}
for (unsigned i = 0; i < sorts.size(); ++i) {
if (valid[i] && sorts[i].get() && !revsub[i].get()) {
revsub[i] = m.mk_var(m_idx++, sorts[i].get());
if (valid[i] && sorts[i] && !revsub[i].get()) {
revsub[i] = m.mk_var(m_idx++, sorts[i]);
}
}
var_subst vs(m, false);
@ -112,7 +112,7 @@ namespace datalog {
app_ref pred(m), head(m);
expr_ref fml1(m), fml2(m), fml(m);
app_ref_vector tail(m);
sort_ref_vector sorts1(m), sorts2(m);
ptr_vector<sort> sorts1, sorts2;
expr_ref_vector conjs1(m), conjs(m);
rule_ref res(rm);
bool_rewriter bwr(m);

366
src/muz_qe/dl_mk_extract_quantifiers2.cpp Normal file
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@ -0,0 +1,366 @@
/*++
Copyright (c) 2012 Microsoft Corporation
Module Name:
dl_mk_extract_quantifiers2.cpp
Abstract:
Remove universal quantifiers over interpreted predicates in the body.
Author:
Nikolaj Bjorner (nbjorner) 2012-11-21
Revision History:
--*/
#include"dl_mk_extract_quantifiers2.h"
#include"ast_pp.h"
#include"dl_bmc_engine.h"
#include"smt_quantifier.h"
#include"smt_context.h"
namespace datalog {
mk_extract_quantifiers2::mk_extract_quantifiers2(context & ctx) :
rule_transformer::plugin(101, false),
m_ctx(ctx),
m(ctx.get_manager()),
rm(ctx.get_rule_manager()),
m_query_pred(m),
m_quantifiers(m),
m_refs(m)
{}
mk_extract_quantifiers2::~mk_extract_quantifiers2() {
reset();
}
void mk_extract_quantifiers2::set_query(func_decl* q) {
m_query_pred = q;
}
bool mk_extract_quantifiers2::matches_signature(func_decl* head, expr_ref_vector const& binding) {
unsigned sz = head->get_arity();
if (sz != binding.size()) {
return false;
}
for (unsigned i = 0; i < sz; ++i) {
if (head->get_domain(i) != m.get_sort(binding[sz-i-1])) {
return false;
}
}
return true;
}
bool mk_extract_quantifiers2::matches_quantifier(quantifier* q, expr_ref_vector const& binding) {
unsigned sz = q->get_num_decls();
if (sz != binding.size()) {
return false;
}
for (unsigned i = 0; i < sz; ++i) {
if (q->get_decl_sort(i) != m.get_sort(binding[sz-i-1])) {
return false;
}
}
return true;
}
bool mk_extract_quantifiers2::mk_abstract_expr(expr_ref& term) {
if (!is_app(term)) {
return false;
}
expr* r;
if (m_map.find(term, r)) {
term = r;
return true;
}
if (to_app(term)->get_family_id() == null_family_id) {
return false;
}
expr_ref_vector args(m);
expr_ref tmp(m);
for (unsigned i = 0; i < to_app(term)->get_num_args(); ++i) {
tmp = to_app(term)->get_arg(i);
if (!mk_abstract_expr(tmp)) {
return false;
}
args.push_back(tmp);
}
tmp = m.mk_app(to_app(term)->get_decl(), args.size(), args.c_ptr());
m_refs.push_back(tmp);
m_map.insert(term, tmp);
term = tmp;
return true;
}
bool mk_extract_quantifiers2::mk_abstract_binding(expr_ref_vector const& binding, expr_ref_vector& result) {
for (unsigned i = 0; i < binding.size(); ++i) {
expr_ref tmp(m);
tmp = binding[i];
if (!mk_abstract_expr(tmp)) {
return false;
}
result.push_back(tmp);
}
return true;
}
void mk_extract_quantifiers2::mk_abstraction_map(rule& r, expr_ref_vector const& binding) {
m_map.reset();
unsigned sz = binding.size();
SASSERT(sz == r.get_decl()->get_arity());
for (unsigned i = 0; i < sz; ++i) {
m_map.insert(binding[sz-i-1], r.get_head()->get_arg(i));
SASSERT(m.get_sort(binding[sz-i-1]) == m.get_sort(r.get_head()->get_arg(i)));
}
// todo: also make bindings for variables in rule body.
}
void mk_extract_quantifiers2::match_bindings(unsigned i, unsigned j, unsigned k) {
expr_ref_vector resb(m);
rule* r = m_qrules[i];
quantifier* q = m_quantifiers[i].get();
expr_ref_vector const& ruleb = m_rule_bindings[i][j];
expr_ref_vector const& quantb = m_quantifier_bindings[i][k];
mk_abstraction_map(*r, ruleb);
if (!mk_abstract_binding(quantb, resb)) {
return;
}
expr_ref inst(m), tmp(m);
var_shifter shift(m);
for (unsigned l = 0; l < resb.size(); ++l) {
tmp = resb[l].get();
shift(tmp, q->get_num_decls(), tmp);
resb[l] = tmp;
}
instantiate(m, q, resb.c_ptr(), inst);
if (!m_seen.contains(r)) {
m_seen.insert(r, alloc(obj_hashtable<expr>));
}
obj_hashtable<expr>& seen = *m_seen.find(r);
if (seen.contains(inst)) {
return;
}
seen.insert(inst);
m_refs.push_back(inst);
if (!m_quantifier_instantiations.contains(r, q)) {
m_quantifier_instantiations.insert(r, q, alloc(expr_ref_vector, m));
}
expr_ref_vector* vec = 0;
VERIFY(m_quantifier_instantiations.find(r, q, vec));
vec->push_back(inst);
TRACE("dl", tout << "matched: " << mk_pp(q, m) << "\n" << mk_pp(inst, m) << "\n";);
}
app_ref mk_extract_quantifiers2::ensure_app(expr* e) {
if (is_app(e)) {
return app_ref(to_app(e), m);
}
else {
return app_ref(m.mk_eq(e, m.mk_true()), m);
}
}
void mk_extract_quantifiers2::extract(rule& r, rule_set& new_rules) {
unsigned utsz = r.get_uninterpreted_tail_size();
unsigned tsz = r.get_tail_size();
bool has_quantifier = false;
expr_ref_vector conjs(m);
for (unsigned i = utsz; i < tsz; ++i) {
conjs.push_back(r.get_tail(i));
}
datalog::flatten_and(conjs);
for (unsigned j = 0; j < conjs.size(); ++j) {
expr* e = conjs[j].get();
quantifier* q;
if (rule_manager::is_forall(m, e, q)) {
m_quantifiers.push_back(q);
m_qrules.push_back(&r);
m_rule_bindings.push_back(vector<expr_ref_vector>());
m_quantifier_bindings.push_back(vector<expr_ref_vector>());
has_quantifier = true;
}
}
if (!has_quantifier) {
new_rules.add_rule(&r);
}
}
void mk_extract_quantifiers2::apply(rule& r, rule_set& new_rules) {
expr_ref_vector tail(m), conjs(m);
expr_ref fml(m);
unsigned utsz = r.get_uninterpreted_tail_size();
unsigned tsz = r.get_tail_size();
for (unsigned i = 0; i < utsz; ++i) {
SASSERT(!r.is_neg_tail(i));
tail.push_back(r.get_tail(i));
}
bool has_quantifier = false;
for (unsigned i = utsz; i < tsz; ++i) {
conjs.push_back(r.get_tail(i));
}
datalog::flatten_and(conjs);
for (unsigned j = 0; j < conjs.size(); ++j) {
expr* e = conjs[j].get();
quantifier* q;
if (rule_manager::is_forall(m, e, q)) {
expr_ref_vector* ls;
if (m_quantifier_instantiations.find(&r,q,ls)) {
tail.append(*ls);
}
has_quantifier = true;
}
else {
tail.push_back(e);
}
}
if (has_quantifier) {
fml = m.mk_implies(m.mk_and(tail.size(), tail.c_ptr()), r.get_head());
rule_ref_vector rules(rm);
rm.mk_rule(fml, rules, r.name());
for (unsigned i = 0; i < rules.size(); ++i) {
new_rules.add_rule(rules[i].get());
}
}
}
#if 0
class mk_extract_quantifiers2::instance_plugin : public smt::quantifier_instance_plugin {
mk_extract_quantifiers2& ex;
ast_manager& m;
expr_ref_vector m_refs;
obj_hashtable<expr> m_bindings;
public:
instance_plugin(mk_extract_quantifiers2& ex): ex(ex), m(ex.m), m_refs(m) {}
virtual void operator()(quantifier* q, unsigned num_bindings, smt::enode*const* bindings) {
expr_ref_vector binding(m);
ptr_vector<sort> sorts;
for (unsigned i = 0; i < num_bindings; ++i) {
binding.push_back(bindings[i]->get_owner());
sorts.push_back(m.get_sort(binding[i].get()));
}
func_decl* f = m.mk_func_decl(symbol("T"), sorts.size(), sorts.c_ptr(), m.mk_bool_sort());
expr_ref tup(m);
tup = m.mk_app(f, binding.size(), binding.c_ptr());
if (!m_bindings.contains(tup)) {
m_bindings.insert(tup);
m_refs.push_back(tup);
ex.m_bindings.push_back(binding);
TRACE("dl", tout << "insert\n" << mk_pp(q, m) << "\n" << mk_pp(tup, m) << "\n";);
}
}
};
#endif
void mk_extract_quantifiers2::reset() {
{
obj_pair_map<rule,quantifier, expr_ref_vector*>::iterator
it = m_quantifier_instantiations.begin(),
end = m_quantifier_instantiations.end();
for (; it != end; ++it) {
dealloc(it->get_value());
}
}
{
obj_map<rule,obj_hashtable<expr>*>::iterator
it = m_seen.begin(),
end = m_seen.end();
for (; it != end; ++it) {
dealloc(it->m_value);
}
}
m_quantifier_instantiations.reset();
m_seen.reset();
m_has_quantifiers = false;
m_quantifiers.reset();
m_qrules.reset();
m_bindings.reset();
m_rule_bindings.reset();
m_quantifier_bindings.reset();
m_refs.reset();
}
rule_set * mk_extract_quantifiers2::operator()(rule_set const & source, model_converter_ref& mc, proof_converter_ref& pc) {
reset();
rule_set::iterator it = source.begin(), end = source.end();
for (; !m_has_quantifiers && it != end; ++it) {
m_has_quantifiers = (*it)->has_quantifiers();
}
if (!m_has_quantifiers) {
return 0;
}
rule_set* rules = alloc(rule_set, m_ctx);
it = source.begin();
for (; it != end; ++it) {
extract(**it, *rules);
}
bmc bmc(m_ctx);
expr_ref_vector fmls(m);
bmc.compile(source, fmls, 0); // TBD: use cancel_eh to terminate without base-case.
bmc.compile(source, fmls, 1);
bmc.compile(source, fmls, 2);
// bmc.compile(source, fmls, 3);
expr_ref query = bmc.compile_query(m_query_pred, 2);
fmls.push_back(query);
smt_params fparams;
fparams.m_relevancy_lvl = 0;
fparams.m_model = true;
fparams.m_model_compact = true;
fparams.m_mbqi = true;
smt::kernel solver(m, fparams);
TRACE("dl",
for (unsigned i = 0; i < fmls.size(); ++i) {
tout << mk_pp(fmls[i].get(), m) << "\n";
});
for (unsigned i = 0; i < fmls.size(); ++i) {
solver.assert_expr(fmls[i].get());
}
#if 0
smt::context& ctx = solver.get_context();
smt::quantifier_manager* qm = ctx.get_quantifier_manager();
qm->get_plugin()->set_instance_plugin(alloc(instance_plugin, *this));
#endif
lbool res = solver.check();
for (unsigned i = 0; i < m_bindings.size(); ++i) {
expr_ref_vector& binding = m_bindings[i];
for (unsigned j = 0; j < m_qrules.size(); ++j) {
rule* r = m_qrules[j];
if (matches_signature(r->get_decl(), binding)) {
m_rule_bindings[j].push_back(binding);
}
else if (matches_quantifier(m_quantifiers[j].get(), binding)) {
m_quantifier_bindings[j].push_back(binding);
}
}
}
for (unsigned i = 0; i < m_qrules.size(); ++i) {
for (unsigned j = 0; j < m_rule_bindings[i].size(); ++j) {
for (unsigned k = 0; k < m_quantifier_bindings[i].size(); ++k) {
match_bindings(i, j, k);
}
}
}
it = source.begin();
for (; it != end; ++it) {
apply(**it, *rules);
}
return rules;
}
};

91
src/muz_qe/dl_mk_extract_quantifiers2.h Normal file
View file

@ -0,0 +1,91 @@
/*++
Copyright (c) 2012 Microsoft Corporation
Module Name:
dl_mk_extract_quantifiers2.h
Abstract:
Replace universal quantifiers over interpreted predicates in the body
by instantiations mined using bounded model checking search.
Author:
Nikolaj Bjorner (nbjorner) 2012-11-21
Revision History:
--*/
#ifndef _DL_MK_EXTRACT_QUANTIFIERS2_H_
#define _DL_MK_EXTRACT_QUANTIFIERS2_H_
#include"dl_context.h"
#include"dl_rule_set.h"
#include"dl_rule_transformer.h"
#include"obj_pair_hashtable.h"
namespace datalog {
/**
\brief Extract universal quantifiers from rules.
*/
class mk_extract_quantifiers2 : public rule_transformer::plugin {
context& m_ctx;
ast_manager& m;
rule_manager& rm;
func_decl_ref m_query_pred;
quantifier_ref_vector m_quantifiers;
ptr_vector<rule> m_qrules;
vector<expr_ref_vector>m_bindings;
vector<vector<expr_ref_vector> > m_rule_bindings;
vector<vector<expr_ref_vector> > m_quantifier_bindings;
obj_pair_map<rule,quantifier, expr_ref_vector*> m_quantifier_instantiations;
obj_map<rule, obj_hashtable<expr>*> m_seen;
bool m_has_quantifiers;
obj_map<expr,expr*> m_map;
expr_ref_vector m_refs;
class instance_plugin;
void reset();
void extract(rule& r, rule_set& new_rules);
void apply(rule& r, rule_set& new_rules);
app_ref ensure_app(expr* e);
bool matches_signature(func_decl* head, expr_ref_vector const& binding);
bool matches_quantifier(quantifier* q, expr_ref_vector const& binding);
void match_bindings(unsigned i, unsigned j, unsigned k);
bool mk_abstract_expr(expr_ref& term);
bool mk_abstract_binding(expr_ref_vector const& binding, expr_ref_vector& result);
void mk_abstraction_map(rule& r, expr_ref_vector const& binding);
public:
/**
\brief Create rule transformer that extracts universal quantifiers (over recursive predicates).
*/
mk_extract_quantifiers2(context & ctx);
virtual ~mk_extract_quantifiers2();
void set_query(func_decl* q);
rule_set * operator()(rule_set const & source, model_converter_ref& mc, proof_converter_ref& pc);
bool has_quantifiers() { return m_has_quantifiers; }
};
};
#endif /* _DL_MK_EXTRACT_QUANTIFIERS2_H_ */

6
src/muz_qe/dl_mk_rule_inliner.cpp
View file

@ -136,14 +136,14 @@ namespace datalog {
expr_ref_vector rule_unifier::get_rule_subst(const rule& r, bool is_tgt) {
SASSERT(m_ready);
expr_ref_vector result(m);
sort_ref_vector sorts(m);
ptr_vector<sort> sorts;
expr_ref v(m), w(m);
r.get_vars(sorts);
for (unsigned i = 0; i < sorts.size(); ++i) {
if (!sorts[i].get()) {
if (!sorts[i]) {
sorts[i] = m.mk_bool_sort();
}
v = m.mk_var(i, sorts[i].get());
v = m.mk_var(i, sorts[i]);
m_subst.apply(2, m_deltas, expr_offset(v, is_tgt?0:1), w);
result.push_back(w);
}

11
src/muz_qe/dl_rule.cpp
View file

@ -41,6 +41,7 @@ Revision History:
#include"expr_replacer.h"
#include"bool_rewriter.h"
#include"qe_lite.h"
#include"expr_safe_replace.h"
namespace datalog {
@ -130,17 +131,15 @@ namespace datalog {
return index;
}
// replace vars by de-bruijn indices
expr_substitution sub(m);
expr_safe_replace rep(m);
for (unsigned i = 0; i < vars.size(); ++i) {
app* v = vars[i].get();
if (names) {
names->push_back(v->get_decl()->get_name());
}
sub.insert(v, m.mk_var(index++,m.get_sort(v)));
rep.insert(v, m.mk_var(index++,m.get_sort(v)));
}
scoped_ptr<expr_replacer> rep = mk_default_expr_replacer(m);
rep->set_substitution(&sub);
(*rep)(fml);
rep(fml);
return index;
}
@ -936,7 +935,7 @@ namespace datalog {
}
}
void rule::get_vars(sort_ref_vector& sorts) const {
void rule::get_vars(ptr_vector<sort>& sorts) const {
sorts.reset();
used_vars used;
get_used_vars(used);

2
src/muz_qe/dl_rule.h
View file

@ -244,7 +244,7 @@ namespace datalog {
void norm_vars(rule_manager & rm);
void get_vars(sort_ref_vector& sorts) const;
void get_vars(ptr_vector<sort>& sorts) const;
void to_formula(expr_ref& result) const;

2
src/muz_qe/pdr_quantifiers.cpp
View file

@ -440,7 +440,7 @@ namespace pdr {
unsigned ut_size = r.get_uninterpreted_tail_size();
unsigned t_size = r.get_tail_size();
var_subst vs(m, false);
sort_ref_vector vars(m);
ptr_vector<sort> vars;
uint_set empty_index_set;
qe_lite qe(m);