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enable exposing internal solver state on interrupted solvers

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-05-30 17:33:27 -07:00
parent e0a86ccc1a
commit 7d245be4e1
15 changed files with 215 additions and 29 deletions
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3
src/api/api_model.cpp
View file

@ -349,10 +349,10 @@ extern "C" {
//
// ----------------------------
#if 0
void Z3_API Z3_del_model(Z3_context c, Z3_model m) {
Z3_model_dec_ref(c, m);
}
unsigned Z3_API Z3_get_model_num_constants(Z3_context c, Z3_model m) {
return Z3_model_get_num_consts(c, m);
}
@ -368,6 +368,7 @@ extern "C" {
Z3_func_decl Z3_API Z3_get_model_func_decl(Z3_context c, Z3_model m, unsigned i) {
return Z3_model_get_func_decl(c, m, i);
}
#endif
unsigned get_model_func_num_entries_core(Z3_context c, Z3_model m, unsigned i) {

3
src/ast/rewriter/pb2bv_rewriter.cpp
View file

@ -822,8 +822,7 @@ struct pb2bv_rewriter::imp {
p.get_bool("keep_cardinality_constraints", false) ||
p.get_bool("sat.cardinality.solver", false) ||
p.get_bool("cardinality.solver", false) ||
gparams::get_module("sat").get_bool("cardinality.solver", false) ||
keep_pb();
gparams::get_module("sat").get_bool("cardinality.solver", false);
}
bool keep_pb() const {

11
src/sat/card_extension.h
View file

@ -42,7 +42,8 @@ namespace sat {
stats() { reset(); }
void reset() { memset(this, 0, sizeof(*this)); }
};
public:
class card {
unsigned m_index;
literal m_lit;
@ -105,6 +106,7 @@ namespace sat {
void swap(unsigned i, unsigned j) { std::swap(m_lits[i], m_lits[j]); }
void negate() { m_lits[0].neg(); }
};
protected:
struct ineq {
literal_vector m_lits;
@ -304,6 +306,13 @@ namespace sat {
void add_at_least(bool_var v, literal_vector const& lits, unsigned k);
void add_pb_ge(bool_var v, svector<wliteral> const& wlits, unsigned k);
void add_xor(bool_var v, literal_vector const& lits);
unsigned num_pb() const { return m_pbs.size(); }
pb const& get_pb(unsigned i) const { return *m_pbs[i]; }
unsigned num_card() const { return m_cards.size(); }
card const& get_card(unsigned i) const { return *m_cards[i]; }
unsigned num_xor() const { return m_xors.size(); }
xor const& get_xor(unsigned i) const { return *m_xors[i]; }
virtual void propagate(literal l, ext_constraint_idx idx, bool & keep);
virtual bool resolve_conflict();
virtual void get_antecedents(literal l, ext_justification_idx idx, literal_vector & r);

2
src/sat/sat_extension.h
View file

@ -46,7 +46,7 @@ namespace sat {
virtual std::ostream& display(std::ostream& out) const = 0;
virtual std::ostream& display_justification(std::ostream& out, ext_justification_idx idx) const = 0;
virtual void collect_statistics(statistics& st) const = 0;
virtual extension* copy(solver* s) = 0;
virtual extension* copy(solver* s) = 0;
virtual void find_mutexes(literal_vector& lits, vector<literal_vector> & mutexes) = 0;
};

2
src/sat/sat_solver.h
View file

@ -309,7 +309,7 @@ namespace sat {
}
void set_par(parallel* p, unsigned id);
bool canceled() { return !m_rlimit.inc(); }
config const& get_config() { return m_config; }
config const& get_config() const { return m_config; }
extension* get_extension() const { return m_ext.get(); }
void set_extension(extension* e);
typedef std::pair<literal, literal> bin_clause;

58
src/sat/sat_solver/inc_sat_solver.cpp
View file

@ -66,7 +66,11 @@ class inc_sat_solver : public solver {
expr_dependency_ref m_dep_core;
svector<double> m_weights;
std::string m_unknown;
// access formulas after they have been pre-processed and handled by the sat solver.
// this allows to access the internal state of the SAT solver and carry on partial results.
bool m_internalized; // are formulas internalized?
bool m_internalized_converted; // have internalized formulas been converted back
expr_ref_vector m_internalized_fmls; // formulas in internalized format
typedef obj_map<expr, sat::literal> dep2asm_t;
public:
@ -81,7 +85,10 @@ public:
m_map(m),
m_num_scopes(0),
m_dep_core(m),
m_unknown("no reason given") {
m_unknown("no reason given"),
m_internalized(false),
m_internalized_converted(false),
m_internalized_fmls(m) {
updt_params(p);
init_preprocess();
}
@ -141,6 +148,8 @@ public:
if (r != l_true) return r;
r = internalize_assumptions(sz, assumptions, dep2asm);
if (r != l_true) return r;
m_internalized = true;
m_internalized_converted = false;
r = m_solver.check(m_asms.size(), m_asms.c_ptr());
@ -170,8 +179,11 @@ public:
m_fmls_head_lim.push_back(m_fmls_head);
if (m_bb_rewriter) m_bb_rewriter->push();
m_map.push();
m_internalized = true;
m_internalized_converted = false;
}
virtual void pop(unsigned n) {
m_internalized = false;
if (n > m_num_scopes) { // allow inc_sat_solver to
n = m_num_scopes; // take over for another solver.
}
@ -204,6 +216,7 @@ public:
}
virtual ast_manager& get_manager() const { return m; }
virtual void assert_expr(expr * t) {
m_internalized = false;
TRACE("goal2sat", tout << mk_pp(t, m) << "\n";);
m_fmls.push_back(t);
}
@ -320,9 +333,18 @@ public:
virtual void get_labels(svector<symbol> & r) {
}
virtual unsigned get_num_assertions() const {
return m_fmls.size();
const_cast<inc_sat_solver*>(this)->convert_internalized();
if (m_internalized && m_internalized_converted) {
return m_internalized_fmls.size();
}
else {
return m_fmls.size();
}
}
virtual expr * get_assertion(unsigned idx) const {
if (m_internalized && m_internalized_converted) {
return m_internalized_fmls[idx];
}
return m_fmls[idx];
}
virtual unsigned get_num_assumptions() const {
@ -332,6 +354,32 @@ public:
return m_asmsf[idx];
}
void convert_internalized() {
if (!m_internalized) return;
sat2goal s2g;
model_converter_ref mc;
goal g(m, false, false, false);
s2g(m_solver, m_map, m_params, g, mc);
extract_model();
if (!m_model) {
m_model = alloc(model, m);
}
model_ref mdl = m_model;
if (m_mc) (*m_mc)(mdl);
for (unsigned i = 0; i < mdl->get_num_constants(); ++i) {
func_decl* c = mdl->get_constant(i);
expr_ref eq(m.mk_eq(m.mk_const(c), mdl->get_const_interp(c)), m);
g.assert_expr(eq);
}
m_internalized_fmls.reset();
g.get_formulas(m_internalized_fmls);
// g.display(std::cout);
m_internalized_converted = true;
// if (mc) mc->display(std::cout << "mc");
// if (m_mc) m_mc->display(std::cout << "m_mc\n");
// if (m_mc0) m_mc0->display(std::cout << "m_mc0\n");
}
void init_preprocess() {
if (m_preprocess) {
m_preprocess->reset();
@ -374,7 +422,7 @@ private:
init_preprocess();
SASSERT(g->models_enabled());
SASSERT(!g->proofs_enabled());
TRACE("goal2sat", g->display(tout););
TRACE("sat", g->display(tout););
try {
(*m_preprocess)(g, m_subgoals, m_mc, m_pc, m_dep_core);
}
@ -391,7 +439,7 @@ private:
}
g = m_subgoals[0];
expr_ref_vector atoms(m);
TRACE("goal2sat", g->display_with_dependencies(tout););
TRACE("sat", g->display_with_dependencies(tout););
m_goal2sat(*g, m_params, m_solver, m_map, dep2asm, true);
m_goal2sat.get_interpreted_atoms(atoms);
if (!atoms.empty()) {

83
src/sat/tactic/goal2sat.cpp
View file

@ -137,7 +137,7 @@ struct goal2sat::imp {
sat::bool_var v = m_solver.mk_var(ext);
m_map.insert(t, v);
l = sat::literal(v, sign);
TRACE("goal2sat", tout << "new_var: " << v << "\n" << mk_ismt2_pp(t, m) << "\n";);
TRACE("sat", tout << "new_var: " << v << ": " << mk_ismt2_pp(t, m) << "\n";);
if (ext && !is_uninterp_const(t)) {
m_interpreted_atoms.push_back(t);
}
@ -993,6 +993,7 @@ struct sat2goal::imp {
expr_ref_vector m_lit2expr;
unsigned long long m_max_memory;
bool m_learned;
unsigned m_glue;
imp(ast_manager & _m, params_ref const & p):m(_m), m_lit2expr(m) {
updt_params(p);
@ -1000,6 +1001,7 @@ struct sat2goal::imp {
void updt_params(params_ref const & p) {
m_learned = p.get_bool("learned", false);
m_glue = p.get_uint("glue", UINT_MAX);
m_max_memory = megabytes_to_bytes(p.get_uint("max_memory", UINT_MAX));
}
@ -1042,20 +1044,71 @@ struct sat2goal::imp {
return m_lit2expr.get(l.index());
}
void assert_clauses(sat::clause * const * begin, sat::clause * const * end, goal & r) {
void assert_pb(goal& r, sat::card_extension::pb const& p) {
pb_util pb(m);
ptr_buffer<expr> lits;
vector<rational> coeffs;
for (unsigned i = 0; i < p.size(); ++i) {
lits.push_back(lit2expr(p[i].second));
coeffs.push_back(rational(p[i].first));
}
rational k(p.k());
expr_ref fml(pb.mk_ge(p.size(), coeffs.c_ptr(), lits.c_ptr(), k), m);
if (p.lit() != sat::null_literal) {
fml = m.mk_eq(lit2expr(p.lit()), fml);
}
r.assert_expr(fml);
}
void assert_card(goal& r, sat::card_extension::card const& c) {
pb_util pb(m);
ptr_buffer<expr> lits;
for (unsigned i = 0; i < c.size(); ++i) {
lits.push_back(lit2expr(c[i]));
}
expr_ref fml(pb.mk_at_most_k(c.size(), lits.c_ptr(), c.k()), m);
if (c.lit() != sat::null_literal) {
fml = m.mk_eq(lit2expr(c.lit()), fml);
}
r.assert_expr(fml);
}
void assert_xor(goal & r, sat::card_extension::xor const& x) {
ptr_buffer<expr> lits;
for (unsigned i = 0; i < x.size(); ++i) {
lits.push_back(lit2expr(x[i]));
}
expr_ref fml(m.mk_xor(x.size(), lits.c_ptr()), m);
if (x.lit() != sat::null_literal) {
fml = m.mk_eq(lit2expr(x.lit()), fml);
}
r.assert_expr(fml);
}
void assert_clauses(sat::solver const & s, sat::clause * const * begin, sat::clause * const * end, goal & r, bool asserted) {
ptr_buffer<expr> lits;
for (sat::clause * const * it = begin; it != end; it++) {
checkpoint();
lits.reset();
sat::clause const & c = *(*it);
unsigned sz = c.size();
for (unsigned i = 0; i < sz; i++) {
lits.push_back(lit2expr(c[i]));
if (asserted || m_learned || c.glue() <= s.get_config().m_gc_small_lbd) {
for (unsigned i = 0; i < sz; i++) {
lits.push_back(lit2expr(c[i]));
}
r.assert_expr(m.mk_or(lits.size(), lits.c_ptr()));
}
r.assert_expr(m.mk_or(lits.size(), lits.c_ptr()));
}
}
sat::card_extension* get_card_extension(sat::solver const& s) {
sat::extension* ext = s.get_extension();
return dynamic_cast<sat::card_extension*>(ext);
}
void operator()(sat::solver const & s, atom2bool_var const & map, goal & r, model_converter_ref & mc) {
if (s.inconsistent()) {
r.assert_expr(m.mk_false());
@ -1087,9 +1140,22 @@ struct sat2goal::imp {
r.assert_expr(m.mk_or(lit2expr(it->first), lit2expr(it->second)));
}
// collect clauses
assert_clauses(s.begin_clauses(), s.end_clauses(), r);
if (m_learned)
assert_clauses(s.begin_learned(), s.end_learned(), r);
assert_clauses(s, s.begin_clauses(), s.end_clauses(), r, true);
assert_clauses(s, s.begin_learned(), s.end_learned(), r, false);
// TBD: collect assertions from plugin
sat::card_extension* ext = get_card_extension(s);
if (ext) {
for (unsigned i = 0; i < ext->num_pb(); ++i) {
assert_pb(r, ext->get_pb(i));
}
for (unsigned i = 0; i < ext->num_card(); ++i) {
assert_card(r, ext->get_card(i));
}
for (unsigned i = 0; i < ext->num_xor(); ++i) {
assert_xor(r, ext->get_xor(i));
}
}
}
};
@ -1100,6 +1166,7 @@ sat2goal::sat2goal():m_imp(0) {
void sat2goal::collect_param_descrs(param_descrs & r) {
insert_max_memory(r);
r.insert("learned", CPK_BOOL, "(default: false) collect also learned clauses.");
r.insert("glue", CPK_UINT, "(default: max-int) collect learned clauses with glue level below parameter.");
}
struct sat2goal::scoped_set_imp {

16
src/solver/solver2tactic.cpp
View file

@ -150,7 +150,21 @@ public:
if (m.canceled()) {
throw tactic_exception(Z3_CANCELED_MSG);
}
throw tactic_exception(local_solver->reason_unknown().c_str());
if (in->models_enabled()) {
model_ref mdl;
local_solver->get_model(mdl);
if (mdl) {
mc = model2model_converter(mdl.get());
mc = concat(fmc.get(), mc.get());
}
}
in->reset();
unsigned sz = local_solver->get_num_assertions();
for (unsigned i = 0; i < sz; ++i) {
in->assert_expr(local_solver->get_assertion(i));
}
result.push_back(in.get());
break;
}
local_solver->collect_statistics(m_st);
}

43
src/tactic/bv/bit_blaster_model_converter.cpp
View file

@ -117,8 +117,10 @@ struct bit_blaster_model_converter : public model_converter {
SASSERT(is_uninterp_const(bit));
func_decl * bit_decl = to_app(bit)->get_decl();
expr * bit_val = old_model->get_const_interp(bit_decl);
// remark: if old_model does not assign bit_val, then assume it is false.
if (bit_val != 0 && m().is_true(bit_val))
if (bit_val == 0) {
goto bail;
}
if (m().is_true(bit_val))
val++;
}
}
@ -133,15 +135,50 @@ struct bit_blaster_model_converter : public model_converter {
func_decl * bit_decl = to_app(bit)->get_decl();
expr * bit_val = old_model->get_const_interp(bit_decl);
// remark: if old_model does not assign bit_val, then assume it is false.
if (bit_val != 0 && !util.is_zero(bit_val))
if (bit_val == 0) {
goto bail;
}
if (!util.is_zero(bit_val))
val++;
}
}
new_val = util.mk_numeral(val, bv_sz);
new_model->register_decl(m_vars.get(i), new_val);
continue;
bail:
new_model->register_decl(m_vars.get(i), mk_bv(bs, *old_model));
}
}
app_ref mk_bv(expr* bs, model& old_model) {
bv_util util(m());
unsigned bv_sz = to_app(bs)->get_num_args();
expr_ref_vector args(m());
app_ref result(m());
for (unsigned j = 0; j < bv_sz; ++j) {
expr * bit = to_app(bs)->get_arg(j);
SASSERT(is_uninterp_const(bit));
func_decl * bit_decl = to_app(bit)->get_decl();
expr * bit_val = old_model.get_const_interp(bit_decl);
if (bit_val != 0) {
args.push_back(bit_val);
}
else {
args.push_back(bit);
}
}
if (TO_BOOL) {
SASSERT(is_app_of(bs, m().get_family_id("bv"), OP_MKBV));
result = util.mk_bv(bv_sz, args.c_ptr());
}
else {
SASSERT(is_app_of(bs, m().get_family_id("bv"), OP_CONCAT));
result = util.mk_concat(bv_sz, args.c_ptr());
}
return result;
}
virtual void operator()(model_ref & md, unsigned goal_idx) {
SASSERT(goal_idx == 0);
model * new_model = alloc(model, m());

7
src/tactic/goal.cpp
View file

@ -262,6 +262,13 @@ void goal::get_formulas(ptr_vector<expr> & result) {
}
}
void goal::get_formulas(expr_ref_vector & result) {
unsigned sz = size();
for (unsigned i = 0; i < sz; i++) {
result.push_back(form(i));
}
}
void goal::update(unsigned i, expr * f, proof * pr, expr_dependency * d) {
// KLM: don't know why this assertion is no longer true
// SASSERT(proofs_enabled() == (pr != 0 && !m().is_undef_proof(pr)));

1
src/tactic/goal.h
View file

@ -120,6 +120,7 @@ public:
void update(unsigned i, expr * f, proof * pr = 0, expr_dependency * dep = 0);
void get_formulas(ptr_vector<expr> & result);
void get_formulas(expr_ref_vector & result);
void elim_true();
void elim_redundancies();

2
src/tactic/portfolio/default_tactic.cpp
View file

@ -30,7 +30,6 @@ Notes:
#include"qffp_tactic.h"
#include"qfaufbv_tactic.h"
#include"qfauflia_tactic.h"
#include"qfufnra_tactic.h"
tactic * mk_default_tactic(ast_manager & m, params_ref const & p) {
tactic * st = using_params(and_then(mk_simplify_tactic(m),
@ -44,7 +43,6 @@ tactic * mk_default_tactic(ast_manager & m, params_ref const & p) {
cond(mk_is_nra_probe(), mk_nra_tactic(m),
cond(mk_is_lira_probe(), mk_lira_tactic(m, p),
cond(mk_is_qffp_probe(), mk_qffp_tactic(m, p),
//cond(mk_is_qfufnra_probe(), mk_qfufnra_tactic(m, p),
mk_smt_tactic()))))))))))),
p);
return st;

6
src/tactic/portfolio/fd_solver.cpp
View file

@ -18,11 +18,13 @@ Notes:
--*/
#include "fd_solver.h"
#include "fd_tactic.h"
#include "tactic.h"
#include "inc_sat_solver.h"
#include "enum2bv_solver.h"
#include "pb2bv_solver.h"
#include "bounded_int2bv_solver.h"
#include "solver/solver2tactic.h"
solver * mk_fd_solver(ast_manager & m, params_ref const & p) {
solver* s = mk_inc_sat_solver(m, p);
@ -31,3 +33,7 @@ solver * mk_fd_solver(ast_manager & m, params_ref const & p) {
s = mk_bounded_int2bv_solver(m, p, s);
return s;
}
tactic * mk_fd_tactic(ast_manager & m, params_ref const& p) {
return mk_solver2tactic(mk_fd_solver(m, p));
}

1
src/tactic/portfolio/fd_solver.h
View file

@ -26,4 +26,5 @@ class solver;
solver * mk_fd_solver(ast_manager & m, params_ref const & p);
#endif

6
src/tactic/portfolio/smt_strategic_solver.cpp
View file

@ -34,11 +34,11 @@ Notes:
#include"default_tactic.h"
#include"ufbv_tactic.h"
#include"qffp_tactic.h"
#include"qfufnra_tactic.h"
#include"horn_tactic.h"
#include"smt_solver.h"
#include"inc_sat_solver.h"
#include"fd_solver.h"
#include"fd_tactic.h"
#include"bv_rewriter.h"
#include"solver2tactic.h"
@ -91,9 +91,7 @@ tactic * mk_tactic_for_logic(ast_manager & m, params_ref const & p, symbol const
else if (logic=="HORN")
return mk_horn_tactic(m, p);
else if (logic == "QF_FD")
return mk_solver2tactic(mk_fd_solver(m, p));
//else if (logic=="QF_UFNRA")
// return mk_qfufnra_tactic(m, p);
return mk_fd_tactic(m, p);
else
return mk_default_tactic(m, p);
}