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Merge branch 'master' of https://github.com/z3prover/z3

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This commit is contained in:
Nikolaj Bjorner 2018-07-06 01:49:19 -07:00
commit a0124a079e
13 changed files with 181 additions and 57 deletions
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4
src/api/api_goal.cpp
View file

@ -199,8 +199,8 @@ extern "C" {
RESET_ERROR_CODE();
std::ostringstream buffer;
if (!to_goal_ref(g)->is_cnf()) {
warning_msg("goal is not in CNF. This will produce a propositional abstraction. "
"If this is not what you want, then preprocess by optional bit-blasting and applying tseitin-cnf");
SET_ERROR_CODE(Z3_INVALID_ARG, "If this is not what you want, then preprocess by optional bit-blasting and applying tseitin-cnf");
RETURN_Z3(nullptr);
}
to_goal_ref(g)->display_dimacs(buffer);
// Hack for removing the trailing '\n'

5
src/api/z3_api.h
View file

@ -5525,6 +5525,11 @@ extern "C" {
/**
\brief Convert a goal into a DIMACS formatted string.
The goal must be in CNF. You can convert a goal to CNF
by applying the tseitin-cnf tactic. Bit-vectors are not automatically
converted to Booleans either, so the caller intends to
preserve satisfiability, it should apply bit-blasting tactics.
Quantifiers and theory atoms will not be encoded.
def_API('Z3_goal_to_dimacs_string', STRING, (_in(CONTEXT), _in(GOAL)))
*/

25
src/ast/rewriter/bit_blaster/bit_blaster_rewriter.cpp
View file

@ -89,6 +89,7 @@ struct blaster_rewriter_cfg : public default_rewriter_cfg {
expr_ref_vector m_out;
obj_map<func_decl, expr*> m_const2bits;
expr_ref_vector m_bindings;
unsigned_vector m_shifts;
func_decl_ref_vector m_keys;
expr_ref_vector m_values;
unsigned_vector m_keyval_lim;
@ -579,19 +580,36 @@ MK_PARAMETRIC_UNARY_REDUCE(reduce_sign_extend, mk_sign_extend);
}
SASSERT(new_bindings.size() == q->get_num_decls());
i = q->get_num_decls();
unsigned shift = j;
if (!m_shifts.empty()) shift += m_shifts.back();
while (i > 0) {
i--;
m_bindings.push_back(new_bindings[i]);
m_shifts.push_back(shift);
}
}
return true;
}
bool reduce_var(var * t, expr_ref & result, proof_ref & result_pr) {
if (m_blast_quant) {
if (t->get_idx() >= m_bindings.size())
if (m_blast_quant) {
if (m_bindings.empty())
return false;
result = m_bindings.get(m_bindings.size() - t->get_idx() - 1);
unsigned shift = m_shifts.back();
if (t->get_idx() >= m_bindings.size()) {
if (shift == 0)
return false;
result = m_manager.mk_var(t->get_idx() + shift, t->get_sort());
}
else {
unsigned offset = m_bindings.size() - t->get_idx() - 1;
result = m_bindings.get(offset);
shift = shift - m_shifts[offset];
if (shift > 0) {
var_shifter vs(m_manager);
vs(result, shift, result);
}
}
result_pr = nullptr;
return true;
}
@ -641,6 +659,7 @@ MK_PARAMETRIC_UNARY_REDUCE(reduce_sign_extend, mk_sign_extend);
old_q->get_num_patterns(), new_patterns, old_q->get_num_no_patterns(), new_no_patterns);
result_pr = nullptr;
m_bindings.shrink(old_sz);
m_shifts.shrink(old_sz);
return true;
}
};

42
src/qe/qe_mbi.cpp
View file

@ -346,10 +346,50 @@ namespace qe {
func_decl_ref_vector no_shared(m);
tg1.set_vars(no_shared, false);
tg1.add_lits(lits);
arith_util a(m);
expr_ref_vector foreign = tg1.shared_occurrences(a.get_family_id());
obj_hashtable<expr> _foreign;
for (expr* e : foreign) _foreign.insert(e);
vector<expr_ref_vector> partition = tg1.get_partition(*mdl);
expr_ref_vector diseq = tg1.get_ackerman_disequalities();
lits.append(diseq);
TRACE("qe", tout << "diseq: " << diseq << "\n";);
TRACE("qe", tout << "diseq: " << diseq << "\n";
tout << "foreign: " << foreign << "\n";
for (auto const& v : partition) {
tout << "partition: {";
bool first = true;
for (expr* e : v) {
if (first) first = false; else tout << ", ";
tout << expr_ref(e, m);
}
tout << "}\n";
}
);
vector<expr_ref_vector> refined_partition;
for (auto & p : partition) {
unsigned j = 0;
for (expr* e : p) {
if (_foreign.contains(e) ||
(is_app(e) && m_shared.contains(to_app(e)->get_decl()))) {
p[j++] = e;
}
}
p.shrink(j);
if (!p.empty()) refined_partition.push_back(p);
}
TRACE("qe",
for (auto const& v : refined_partition) {
tout << "partition: {";
bool first = true;
for (expr* e : v) {
if (first) first = false; else tout << ", ";
tout << expr_ref(e, m);
}
tout << "}\n";
});
arith_project_plugin ap(m);
ap.set_check_purified(false);

70
src/qe/qe_term_graph.cpp
View file

@ -99,7 +99,7 @@ namespace qe {
m_mark(false),
m_mark2(false),
m_interpreted(false) {
if (!is_app()) return;
if (!is_app(m_expr)) return;
for (expr* e : *to_app(m_expr)) {
term* t = app2term[e->get_id()];
t->get_root().m_parents.push_back(this);
@ -151,7 +151,7 @@ namespace qe {
unsigned get_id() const { return m_expr->get_id();}
unsigned get_decl_id() const { return is_app() ? get_app()->get_decl()->get_id() : m_expr->get_id(); }
unsigned get_decl_id() const { return is_app(m_expr) ? to_app(m_expr)->get_decl()->get_id() : m_expr->get_id(); }
bool is_marked() const {return m_mark;}
void set_mark(bool v){m_mark = v;}
@ -159,12 +159,10 @@ namespace qe {
void set_mark2(bool v){m_mark2 = v;} // NSB: where is this used?
bool is_interpreted() const {return m_interpreted;}
bool is_theory() const { return !is_app() || get_app()->get_family_id() != null_family_id; }
bool is_theory() const { return !is_app(m_expr) || to_app(m_expr)->get_family_id() != null_family_id; }
void mark_as_interpreted() {m_interpreted=true;}
expr* get_expr() const {return m_expr;}
bool is_app() const {return ::is_app(m_expr);}
app *get_app() const {return is_app() ? to_app(m_expr) : nullptr;}
unsigned get_num_args() const { return is_app() ? get_app()->get_num_args() : 0; }
unsigned get_num_args() const { return is_app(m_expr) ? to_app(m_expr)->get_num_args() : 0; }
term &get_root() const {return *m_root;}
bool is_root() const {return m_root == this;}
@ -226,7 +224,7 @@ namespace qe {
}
bool term_graph::is_variable_proc::operator()(const term &t) const {
return (*this)(t.get_app());
return (*this)(t.get_expr());
}
void term_graph::is_variable_proc::set_decls(const func_decl_ref_vector &decls, bool exclude) {
@ -444,7 +442,7 @@ namespace qe {
return expr_ref(res, m);
}
res = mk_app_core (r.get_app());
res = mk_app_core (r.get_expr());
m_term2app.insert(r.get_id(), res);
return expr_ref(res, m);
@ -463,7 +461,7 @@ namespace qe {
SASSERT(t.is_root());
expr_ref rep(mk_app(t), m);
for (term *it = &t.get_next(); it != &t; it = &it->get_next()) {
expr* mem = mk_app_core(it->get_app());
expr* mem = mk_app_core(it->get_expr());
out.push_back (m.mk_eq (rep, mem));
}
}
@ -472,9 +470,9 @@ namespace qe {
mk_equalities(t, out);
for (term *it = &t.get_next(); it != &t; it = &it->get_next ()) {
expr* a1 = mk_app_core (it->get_app());
expr* a1 = mk_app_core (it->get_expr());
for (term *it2 = &it->get_next(); it2 != &t; it2 = &it2->get_next()) {
expr* a2 = mk_app_core(it2->get_app());
expr* a2 = mk_app_core(it2->get_expr());
out.push_back (m.mk_eq (a1, a2));
}
}
@ -1000,6 +998,47 @@ namespace qe {
reset();
return res;
}
vector<expr_ref_vector> get_partition(model& mdl) {
vector<expr_ref_vector> result;
expr_ref_vector pinned(m);
obj_map<expr, unsigned> pid;
model::scoped_model_completion _smc(mdl, true);
for (term *t : m_tg.m_terms) {
expr* a = t->get_expr();
if (!is_app(a)) continue;
if (m.is_bool(a)) continue;
expr_ref val = mdl(a);
unsigned p = 0;
// NB. works for simple domains Integers, Rationals,
// but not for algebraic numerals.
if (!pid.find(val, p)) {
p = pid.size();
pid.insert(val, p);
pinned.push_back(val);
result.push_back(expr_ref_vector(m));
}
result[p].push_back(a);
}
return result;
}
expr_ref_vector shared_occurrences(family_id fid) {
expr_ref_vector result(m);
for (term *t : m_tg.m_terms) {
expr* e = t->get_expr();
if (m.get_sort(e)->get_family_id() != fid) continue;
for (term * p : term::parents(t->get_root())) {
expr* pe = p->get_expr();
if (!is_app(pe)) continue;
if (to_app(pe)->get_family_id() == fid) continue;
if (to_app(pe)->get_family_id() == m.get_basic_family_id()) continue;
result.push_back(e);
break;
}
}
return result;
}
};
void term_graph::set_vars(func_decl_ref_vector const& decls, bool exclude) {
@ -1033,5 +1072,14 @@ namespace qe {
return p.get_ackerman_disequalities();
}
vector<expr_ref_vector> term_graph::get_partition(model& mdl) {
term_graph::projector p(*this);
return p.get_partition(mdl);
}
expr_ref_vector term_graph::shared_occurrences(family_id fid) {
term_graph::projector p(*this);
return p.shared_occurrences(fid);
}
}

13
src/qe/qe_term_graph.h
View file

@ -122,6 +122,19 @@ namespace qe {
*/
expr_ref_vector get_ackerman_disequalities();
/**
* Produce a model-based partition.
*/
vector<expr_ref_vector> get_partition(model& mdl);
/**
* Extract shared occurrences of terms whose sort are
* fid, but appear in a context that is not fid.
* for example f(x + y) produces the shared occurrence
* x + y when f is uninterpreted and x + y has sort Int or Real.
*/
expr_ref_vector shared_occurrences(family_id fid);
};
}

12
src/sat/sat_solver.cpp
View file

@ -17,6 +17,7 @@ Revision History:
--*/
#include <cmath>
#include "sat/sat_solver.h"
#include "sat/sat_integrity_checker.h"
@ -298,6 +299,9 @@ namespace sat {
if (!c.is_learned()) {
m_stats.m_non_learned_generation++;
}
if (c.frozen()) {
--m_num_frozen;
}
if (m_config.m_drat && !m_drat.is_cleaned(c)) {
m_drat.del(c);
}
@ -481,9 +485,10 @@ namespace sat {
}
unsigned some_idx = c.size() >> 1;
literal block_lit = c[some_idx];
DEBUG_CODE(for (auto const& w : m_watches[(~c[0]).index()]) VERIFY(!w.is_clause() || w.get_clause_offset() != cls_off););
DEBUG_CODE(for (auto const& w : m_watches[(~c[1]).index()]) VERIFY(!w.is_clause() || w.get_clause_offset() != cls_off););
VERIFY(c[0] != c[1]);
VERIFY(!c.frozen());
DEBUG_CODE(for (auto const& w : m_watches[(~c[0]).index()]) SASSERT(!w.is_clause() || w.get_clause_offset() != cls_off););
DEBUG_CODE(for (auto const& w : m_watches[(~c[1]).index()]) SASSERT(!w.is_clause() || w.get_clause_offset() != cls_off););
SASSERT(c[0] != c[1]);
m_watches[(~c[0]).index()].push_back(watched(block_lit, cls_off));
m_watches[(~c[1]).index()].push_back(watched(block_lit, cls_off));
return reinit;
@ -2139,7 +2144,6 @@ namespace sat {
else {
c.inc_inact_rounds();
if (c.inact_rounds() > m_config.m_gc_k) {
m_num_frozen--;
del_clause(c);
m_stats.m_gc_clause++;
deleted++;

4
src/sat/sat_solver.h
View file

@ -682,10 +682,10 @@ namespace sat {
bool m_deleted;
public:
scoped_detach(solver& s, clause& c): s(s), c(c), m_deleted(false) {
s.detach_clause(c);
if (!c.frozen()) s.detach_clause(c);
}
~scoped_detach() {
if (!m_deleted) s.attach_clause(c);
if (!m_deleted && !c.frozen()) s.attach_clause(c);
}
void del_clause() {

4
src/smt/theory_lra.cpp
View file

@ -1168,7 +1168,9 @@ public:
if (m_variable_values.count(vi) > 0)
return m_variable_values[vi];
SASSERT (m_solver->is_term(vi));
if(!m_solver->is_term(vi))
return rational::zero();
m_todo_terms.push_back(std::make_pair(vi, rational::one()));
rational result(0);
while (!m_todo_terms.empty()) {

6
src/tactic/goal.cpp
View file

@ -733,7 +733,9 @@ bool goal::is_cnf() const {
bool goal::is_literal(expr* f) const {
m_manager.is_not(f, f);
if (!is_app(f)) return false;
if (to_app(f)->get_family_id() == m_manager.get_basic_family_id() &&
!m_manager.is_false(f) && !m_manager.is_true(f)) return false;
if (to_app(f)->get_family_id() == m_manager.get_basic_family_id()) {
for (expr* arg : *to_app(f))
if (m_manager.is_bool(arg)) return false;
}
return true;
}

5
src/util/lp/lar_solver.cpp
View file

@ -1507,11 +1507,6 @@ bool lar_solver::column_is_fixed(unsigned j) const {
return m_mpq_lar_core_solver.column_is_fixed(j);
}
bool lar_solver::ext_var_is_int(var_index ext_var) const {
return m_var_register.external_is_int(ext_var);
}
// below is the initialization functionality of lar_solver
bool lar_solver::strategy_is_undecided() const {

2
src/util/lp/lar_solver.h
View file

@ -155,8 +155,6 @@ public:
bool var_is_int(var_index v) const;
bool ext_var_is_int(var_index ext_var) const;
void add_non_basic_var_to_core_fields(unsigned ext_j, bool is_int);
void add_new_var_to_core_fields_for_doubles(bool register_in_basis);

46
src/util/lp/var_register.h
View file

@ -19,19 +19,19 @@ Revision History:
#pragma once
namespace lp {
class ext_var_info {
unsigned m_internal_j; // the internal index
unsigned m_external_j; // the internal index
bool m_is_integer;
public:
ext_var_info() {}
ext_var_info(unsigned j): ext_var_info(j, true) {}
ext_var_info(unsigned j , bool is_int) : m_internal_j(j), m_is_integer(is_int) {}
unsigned internal_j() const { return m_internal_j;}
ext_var_info(unsigned j , bool is_int) : m_external_j(j), m_is_integer(is_int) {}
unsigned external_j() const { return m_external_j;}
bool is_integer() const {return m_is_integer;}
};
class var_register {
svector<unsigned> m_local_to_external;
std::unordered_map<unsigned, ext_var_info> m_external_to_local;
svector<ext_var_info> m_local_to_external;
std::unordered_map<unsigned, unsigned> m_external_to_local;
public:
unsigned add_var(unsigned user_var) {
return add_var(user_var, true);
@ -39,19 +39,23 @@ public:
unsigned add_var(unsigned user_var, bool is_int) {
auto t = m_external_to_local.find(user_var);
if (t != m_external_to_local.end()) {
return t->second.internal_j();
return t->second;
}
unsigned j = size();
m_external_to_local[user_var] = ext_var_info(j, is_int);
m_local_to_external.push_back(user_var);
return j;
m_local_to_external.push_back(ext_var_info(user_var, is_int));
return m_external_to_local[user_var] = size() - 1;
}
const svector<unsigned> & vars() const { return m_local_to_external; }
svector<unsigned> vars() const {
svector<unsigned> ret;
for (const auto& p : m_local_to_external) {
ret.push_back(p.external_j());
}
return ret;
}
unsigned local_to_external(unsigned local_var) const {
return m_local_to_external[local_var];
return m_local_to_external[local_var].external_j();
}
unsigned size() const {
return m_local_to_external.size();
@ -64,13 +68,7 @@ public:
unsigned external_to_local(unsigned j) const {
auto it = m_external_to_local.find(j);
lp_assert(it != m_external_to_local.end());
return it->second.internal_j();
}
bool external_is_int(unsigned j) const {
auto it = m_external_to_local.find(j);
lp_assert(it != m_external_to_local.end());
return it->second.is_integer();
return it->second;
}
bool external_is_used(unsigned ext_j) const {
@ -82,7 +80,7 @@ public:
auto it = m_external_to_local.find(ext_j);
if ( it == m_external_to_local.end())
return false;
local_j = it->second.internal_j();
local_j = it->second;
return true;
}
@ -90,19 +88,19 @@ public:
auto it = m_external_to_local.find(ext_j);
if ( it == m_external_to_local.end())
return false;
local_j = it->second.internal_j();
is_int = it->second.is_integer();
local_j = it->second;
is_int = m_local_to_external[local_j].is_integer();
return true;
}
bool local_is_int(unsigned j) const {
return external_is_int(m_local_to_external[j]);
return m_local_to_external[j].is_integer();
}
void shrink(unsigned shrunk_size) {
for (unsigned j = size(); j-- > shrunk_size;) {
m_external_to_local.erase(m_local_to_external[j]);
m_external_to_local.erase(m_local_to_external[j].external_j());
}
m_local_to_external.resize(shrunk_size);
}