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disable cancelation during propagation at base level

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-03-26 16:19:36 -07:00
parent 3a7bf2cf61
commit 5478955199
7 changed files with 149 additions and 288 deletions
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2
src/model/func_interp.cpp
View file

@ -203,7 +203,7 @@ void func_interp::insert_new_entry(expr * const * args, expr * r) {
}
tout << "Old: " << mk_ismt2_pp(get_entry(args)->get_result(), m_manager) << "\n";
);
SASSERT(get_entry(args) == 0);
SASSERT(get_entry(args) == nullptr);
func_entry * new_entry = func_entry::mk(m_manager, m_arity, args, r);
if (!new_entry->args_are_values())
m_args_are_values = false;

181
src/smt/smt_cg_table.cpp
View file

@ -22,81 +22,6 @@ Revision History:
namespace smt {
#if 0
unsigned cg_table::cg_hash::operator()(enode * n) const {
if (n->is_commutative()) {
return combine_hash(n->get_decl_id(),
n->get_arg(0)->get_root()->hash() *
n->get_arg(1)->get_root()->hash());
}
else {
unsigned num = n->get_num_args();
switch (num) {
case 0: UNREACHABLE(); return 0;
case 1:
return combine_hash(n->get_decl_id(), n->get_arg(0)->get_root()->hash());
case 2: {
unsigned a = n->get_decl_id();
unsigned b = n->get_arg(0)->get_root()->hash();
unsigned c = n->get_arg(1)->get_root()->hash();
mix(a,b,c);
return c;
}
default:
return get_composite_hash<enode *, cg_khasher, cg_chasher>(n, n->get_num_args(), m_khasher, m_chasher);
}
}
}
bool cg_table::cg_eq::operator()(enode * n1, enode * n2) const {
#if 0
static unsigned counter = 0;
static unsigned failed = 0;
bool r = congruent(n1, n2, m_commutativity);
if (!r)
failed++;
counter++;
if (counter % 100000 == 0)
std::cout << "cg_eq: " << counter << " " << failed << "\n";
return r;
#else
return congruent(n1, n2, m_commutativity);
#endif
}
cg_table::cg_table(ast_manager & m):
m_manager(m),
m_table(DEFAULT_HASHTABLE_INITIAL_CAPACITY, cg_hash(), cg_eq(m_commutativity)) {
}
void cg_table::display(std::ostream & out) const {
out << "congruence table:\n";
for (enode * n : m_table) {
out << mk_pp(n->get_owner(), m_manager) << "\n";
}
}
void cg_table::display_compact(std::ostream & out) const {
if (!m_table.empty()) {
out << "congruence table:\n";
for (enode * n : m_table) {
out << "#" << n->get_owner()->get_id() << " ";
}
out << "\n";
}
}
#ifdef Z3DEBUG
bool cg_table::check_invariant() const {
for (enode * n : m_table) {
CTRACE("cg_table", !contains_ptr(n), tout << "#" << n->get_owner_id() << "\n";);
SASSERT(contains_ptr(n));
}
return true;
}
#endif
#else
// one table per func_decl implementation
unsigned cg_table::cg_hash::operator()(enode * n) const {
SASSERT(n->get_decl()->is_flat_associative() || n->get_num_args() >= 3);
@ -222,18 +147,116 @@ namespace smt {
}
void cg_table::display(std::ostream & out) const {
for (auto const& kv : m_func_decl2id) {
void * t = m_tables[kv.m_value];
out << mk_pp(kv.m_key, m_manager) << ": ";
switch (GET_TAG(t)) {
case UNARY:
display_unary(out, t);
break;
case BINARY:
display_binary(out, t);
break;
case BINARY_COMM:
display_binary_comm(out, t);
break;
case NARY:
display_nary(out, t);
break;
}
}
}
void cg_table::display_binary(std::ostream& out, void* t) const {
binary_table* tb = UNTAG(binary_table*, t);
out << "b ";
for (enode* n : *tb) {
out << n->get_owner_id() << " " << cg_binary_hash()(n) << " ";
}
out << "\n";
}
void cg_table::display_binary_comm(std::ostream& out, void* t) const {
comm_table* tb = UNTAG(comm_table*, t);
out << "bc ";
for (enode* n : *tb) {
out << n->get_owner_id() << " ";
}
out << "\n";
}
void cg_table::display_unary(std::ostream& out, void* t) const {
unary_table* tb = UNTAG(unary_table*, t);
out << "un ";
for (enode* n : *tb) {
out << n->get_owner_id() << " ";
}
out << "\n";
}
void cg_table::display_nary(std::ostream& out, void* t) const {
table* tb = UNTAG(table*, t);
out << "nary ";
for (enode* n : *tb) {
out << n->get_owner_id() << " ";
}
out << "\n";
}
enode_bool_pair cg_table::insert(enode * n) {
// it doesn't make sense to insert a constant.
SASSERT(n->get_num_args() > 0);
SASSERT(!m_manager.is_and(n->get_owner()));
SASSERT(!m_manager.is_or(n->get_owner()));
enode * n_prime;
void * t = get_table(n);
switch (static_cast<table_kind>(GET_TAG(t))) {
case UNARY:
n_prime = UNTAG(unary_table*, t)->insert_if_not_there(n);
return enode_bool_pair(n_prime, false);
case BINARY:
n_prime = UNTAG(binary_table*, t)->insert_if_not_there(n);
TRACE("cg_table", tout << "insert: " << n->get_owner_id() << " " << cg_binary_hash()(n) << " inserted: " << (n == n_prime) << " " << n_prime->get_owner_id() << "\n";
display_binary(tout, t); tout << "contains_ptr: " << contains_ptr(n) << "\n";);
return enode_bool_pair(n_prime, false);
case BINARY_COMM:
m_commutativity = false;
n_prime = UNTAG(comm_table*, t)->insert_if_not_there(n);
return enode_bool_pair(n_prime, m_commutativity);
default:
n_prime = UNTAG(table*, t)->insert_if_not_there(n);
return enode_bool_pair(n_prime, false);
}
}
void cg_table::erase(enode * n) {
SASSERT(n->get_num_args() > 0);
void * t = get_table(n);
switch (static_cast<table_kind>(GET_TAG(t))) {
case UNARY:
UNTAG(unary_table*, t)->erase(n);
break;
case BINARY:
TRACE("cg_table", tout << "erase: " << n->get_owner_id() << " " << cg_binary_hash()(n) << " contains: " << contains_ptr(n) << "\n";);
UNTAG(binary_table*, t)->erase(n);
break;
case BINARY_COMM:
UNTAG(comm_table*, t)->erase(n);
break;
default:
UNTAG(table*, t)->erase(n);
break;
}
}
void cg_table::display_compact(std::ostream & out) const {
}
#ifdef Z3DEBUG
bool cg_table::check_invariant() const {
return true;
}
#endif
#endif
};

155
src/smt/smt_cg_table.h
View file

@ -27,89 +27,6 @@ namespace smt {
typedef std::pair<enode *, bool> enode_bool_pair;
#if 0
/**
\brief Congruence table.
*/
class cg_table {
struct cg_khasher {
unsigned operator()(enode const * n) const { return n->get_decl_id(); }
};
struct cg_chasher {
unsigned operator()(enode const * n, unsigned idx) const {
return n->get_arg(idx)->get_root()->hash();
}
};
struct cg_hash {
cg_khasher m_khasher;
cg_chasher m_chasher;
public:
unsigned operator()(enode * n) const;
};
struct cg_eq {
bool & m_commutativity;
cg_eq(bool & comm):m_commutativity(comm) {}
bool operator()(enode * n1, enode * n2) const;
};
typedef ptr_hashtable<enode, cg_hash, cg_eq> table;
ast_manager & m_manager;
bool m_commutativity; //!< true if the last found congruence used commutativity
table m_table;
public:
cg_table(ast_manager & m);
/**
\brief Try to insert n into the table. If the table already
contains an element n' congruent to n, then do nothing and
return n' and a boolean indicating whether n and n' are congruence
modulo commutativity, otherwise insert n and return (n,false).
*/
enode_bool_pair insert(enode * n) {
// it doesn't make sense to insert a constant.
SASSERT(n->get_num_args() > 0);
m_commutativity = false;
enode * n_prime = m_table.insert_if_not_there(n);
SASSERT(contains(n));
return enode_bool_pair(n_prime, m_commutativity);
}
void erase(enode * n) {
SASSERT(n->get_num_args() > 0);
m_table.erase(n);
SASSERT(!contains(n));
}
bool contains(enode * n) const {
return m_table.contains(n);
}
enode * find(enode * n) const {
enode * r = 0;
return m_table.find(n, r) ? r : 0;
}
bool contains_ptr(enode * n) const {
enode * n_prime;
return m_table.find(n, n_prime) && n == n_prime;
}
void reset() {
m_table.reset();
}
void display(std::ostream & out) const;
void display_compact(std::ostream & out) const;
#ifdef Z3DEBUG
bool check_invariant() const;
#endif
};
#else
// one table per function symbol
/**
@ -137,9 +54,6 @@ namespace smt {
struct cg_binary_hash {
unsigned operator()(enode * n) const {
SASSERT(n->get_num_args() == 2);
// too many collisions
// unsigned r = 17 + n->get_arg(0)->get_root()->hash();
// return r * 31 + n->get_arg(1)->get_root()->hash();
return combine_hash(n->get_arg(0)->get_root()->hash(), n->get_arg(1)->get_root()->hash());
}
};
@ -149,23 +63,9 @@ namespace smt {
SASSERT(n1->get_num_args() == 2);
SASSERT(n2->get_num_args() == 2);
SASSERT(n1->get_decl() == n2->get_decl());
#if 1
return
n1->get_arg(0)->get_root() == n2->get_arg(0)->get_root() &&
n1->get_arg(1)->get_root() == n2->get_arg(1)->get_root();
#else
bool r =
n1->get_arg(0)->get_root() == n2->get_arg(0)->get_root() &&
n1->get_arg(1)->get_root() == n2->get_arg(1)->get_root();
static unsigned counter = 0;
static unsigned failed = 0;
if (!r)
failed++;
counter++;
if (counter % 100000 == 0)
std::cerr << "[cg_eq] " << counter << " " << failed << "\n";
return r;
#endif
}
};
@ -249,48 +149,9 @@ namespace smt {
return n' and a boolean indicating whether n and n' are congruence
modulo commutativity, otherwise insert n and return (n,false).
*/
enode_bool_pair insert(enode * n) {
// it doesn't make sense to insert a constant.
SASSERT(n->get_num_args() > 0);
SASSERT(!m_manager.is_and(n->get_owner()));
SASSERT(!m_manager.is_or(n->get_owner()));
enode * n_prime;
void * t = get_table(n);
switch (static_cast<table_kind>(GET_TAG(t))) {
case UNARY:
n_prime = UNTAG(unary_table*, t)->insert_if_not_there(n);
return enode_bool_pair(n_prime, false);
case BINARY:
n_prime = UNTAG(binary_table*, t)->insert_if_not_there(n);
return enode_bool_pair(n_prime, false);
case BINARY_COMM:
m_commutativity = false;
n_prime = UNTAG(comm_table*, t)->insert_if_not_there(n);
return enode_bool_pair(n_prime, m_commutativity);
default:
n_prime = UNTAG(table*, t)->insert_if_not_there(n);
return enode_bool_pair(n_prime, false);
}
}
enode_bool_pair insert(enode * n);
void erase(enode * n) {
SASSERT(n->get_num_args() > 0);
void * t = get_table(n);
switch (static_cast<table_kind>(GET_TAG(t))) {
case UNARY:
UNTAG(unary_table*, t)->erase(n);
break;
case BINARY:
UNTAG(binary_table*, t)->erase(n);
break;
case BINARY_COMM:
UNTAG(comm_table*, t)->erase(n);
break;
default:
UNTAG(table*, t)->erase(n);
break;
}
}
void erase(enode * n);
bool contains(enode * n) const {
SASSERT(n->get_num_args() > 0);
@ -343,13 +204,19 @@ namespace smt {
void display(std::ostream & out) const;
void display_binary(std::ostream& out, void* t) const;
void display_binary_comm(std::ostream& out, void* t) const;
void display_unary(std::ostream& out, void* t) const;
void display_nary(std::ostream& out, void* t) const;
void display_compact(std::ostream & out) const;
#ifdef Z3DEBUG
bool check_invariant() const;
#endif
};
#endif
};
#endif /* SMT_CG_TABLE_H_ */

89
src/smt/smt_context.cpp
View file

@ -86,7 +86,8 @@ namespace smt {
m_generation(0),
m_last_search_result(l_undef),
m_last_search_failure(UNKNOWN),
m_searching(false) {
m_searching(false),
m_propagating(false) {
SASSERT(m_scope_lvl == 0);
SASSERT(m_base_lvl == 0);
@ -131,8 +132,13 @@ namespace smt {
return literal(v, lit.sign());
}
/**
\brief retrieve flag for when cancelation is possible.
Cancelation is not safe during propagation at base level because
congruences cannot be retracted to a consistent state.
*/
bool context::get_cancel_flag() {
return !m_manager.limit().inc();
return !m_manager.limit().inc() && !(at_base_level() && m_propagating);
}
void context::updt_params(params_ref const& p) {
@ -548,14 +554,10 @@ namespace smt {
mark_as_relevant(r1);
}
TRACE("add_eq", tout << "to trail\n";);
push_trail(add_eq_trail(r1, n1, r2->get_num_parents()));
TRACE("add_eq", tout << "qmanager add_eq\n";);
m_qmanager->add_eq_eh(r1, r2);
TRACE("add_eq", tout << "merge theory_vars\n";);
merge_theory_vars(n2, n1, js);
// 'Proof' tree
@ -571,25 +573,6 @@ namespace smt {
// r1 -> .. -> n1 -> n2 -> ... -> r2
#if 0
{
static unsigned counter = 0;
static unsigned num_adds = 0;
static unsigned num_bad_adds = 0;
num_adds++;
if (r1->get_class_size() <= r2->get_class_size() &&
r1->m_parents.size() > r2->m_parents.size()) {
num_bad_adds++;
}
if (num_adds % 100000 == 0) {
verbose_stream() << "[add-eq]: " << num_bad_adds << " " << num_adds << " "
<< static_cast<double>(num_bad_adds)/static_cast<double>(num_adds) << "\n";
}
}
#endif
TRACE("add_eq", tout << "remove_parents_from_cg_table\n";);
remove_parents_from_cg_table(r1);
enode * curr = r1;
@ -600,11 +583,8 @@ namespace smt {
while(curr != r1);
SASSERT(r1->get_root() == r2);
TRACE("add_eq", tout << "reinsert_parents_into_cg_table\n";);
reinsert_parents_into_cg_table(r1, r2, n1, n2, js);
TRACE("add_eq", tout << "propagate_bool_enode_assignment\n";);
if (n2->is_bool())
propagate_bool_enode_assignment(r1, r2, n1, n2);
@ -632,25 +612,21 @@ namespace smt {
void context::remove_parents_from_cg_table(enode * r1) {
// Remove parents from the congruence table
for (enode * parent : enode::parents(r1)) {
#if 0
{
static unsigned num_eqs = 0;
static unsigned num_parents = 0;
static unsigned counter = 0;
if (parent->is_eq())
num_eqs++;
num_parents++;
if (num_parents % 100000 == 0) {
verbose_stream() << "[remove-cg] " << num_eqs << " " << num_parents << " "
<< static_cast<double>(num_eqs)/static_cast<double>(num_parents) << "\n";
}
}
#endif
SASSERT(parent->is_marked() || !parent->is_cgc_enabled() ||
(!parent->is_true_eq() && parent->is_cgr() == m_cg_table.contains_ptr(parent)) ||
(parent->is_true_eq() && !m_cg_table.contains_ptr(parent)));
CTRACE("add_eq", !parent->is_marked() && parent->is_cgc_enabled() && parent->is_true_eq() && m_cg_table.contains_ptr(parent), tout << parent->get_owner_id() << "\n";);
CTRACE("add_eq", !parent->is_marked() && parent->is_cgc_enabled() && !parent->is_true_eq() && parent->is_cgr() && !m_cg_table.contains_ptr(parent),
tout << "cgr !contains " << parent->get_owner_id() << " " << mk_pp(parent->get_decl(), m_manager) << "\n";
for (enode* n : enode::args(parent)) tout << n->get_root()->get_owner_id() << " " << n->get_root()->hash() << " ";
tout << "\n";
tout << "contains: " << m_cg_table.contains(parent) << "\n";
if (m_cg_table.contains(parent)) {
tout << "owner: " << m_cg_table.find(parent)->get_owner_id() << "\n";
}
m_cg_table.display(tout);
);
CTRACE("add_eq", !parent->is_marked() && parent->is_cgc_enabled() && !parent->is_true_eq() && !parent->is_cgr() && m_cg_table.contains_ptr(parent), tout << "!cgr contains " << parent->get_owner_id() << "\n";);
SASSERT(parent->is_marked() || !parent->is_cgc_enabled() || parent->is_true_eq() || parent->is_cgr() == m_cg_table.contains_ptr(parent));
SASSERT(parent->is_marked() || !parent->is_cgc_enabled() || !parent->is_true_eq() || !m_cg_table.contains_ptr(parent));
if (!parent->is_marked() && parent->is_cgr() && !parent->is_true_eq()) {
TRACE("add_eq_parents", tout << "add_eq removing: #" << parent->get_owner_id() << "\n";);
SASSERT(!parent->is_cgc_enabled() || m_cg_table.contains_ptr(parent));
parent->set_mark();
if (parent->is_cgc_enabled()) {
@ -704,7 +680,6 @@ namespace smt {
enode_bool_pair pair = m_cg_table.insert(parent);
enode * parent_prime = pair.first;
if (parent_prime == parent) {
TRACE("add_eq_parents", tout << "add_eq reinserting: #" << parent->get_owner_id() << "\n";);
SASSERT(parent);
SASSERT(parent->is_cgr());
SASSERT(m_cg_table.contains_ptr(parent));
@ -983,7 +958,6 @@ namespace smt {
for (; it != end; ++it) {
enode * parent = *it;
if (parent->is_cgc_enabled()) {
TRACE("add_eq_parents", tout << "removing: #" << parent->get_owner_id() << "\n";);
CTRACE("add_eq", !parent->is_cgr() || !m_cg_table.contains_ptr(parent),
tout << "old num_parents: " << r2_num_parents << ", num_parents: " << r2->m_parents.size() << ", parent: #" <<
parent->get_owner_id() << ", parents: \n";
@ -1011,14 +985,13 @@ namespace smt {
for (enode * parent : enode::parents(r1)) {
TRACE("add_eq_parents", tout << "visiting: #" << parent->get_owner_id() << "\n";);
if (parent->is_cgc_enabled()) {
enode * cg = parent->m_cg;
enode * cg = parent->m_cg;
if (!parent->is_true_eq() &&
(parent == cg || // parent was root of the congruence class before and after the merge
!congruent(parent, cg) // parent was root of the congruence class before but not after the merge
(parent == cg || // parent was root of the congruence class before and after the merge
!congruent(parent, cg) // parent was root of the congruence class before but not after the merge
)) {
TRACE("add_eq_parents", tout << "trying to reinsert\n";);
m_cg_table.insert(parent);
parent->m_cg = parent;
enode_bool_pair p = m_cg_table.insert(parent);
parent->m_cg = p.first;
}
}
}
@ -1353,13 +1326,14 @@ namespace smt {
\remark The method assign_eq adds a new entry on this queue.
*/
bool context::propagate_eqs() {
TRACE("add_eq", tout << m_eq_propagation_queue.size() << "\n";);
for (unsigned i = 0; i < m_eq_propagation_queue.size() && !get_cancel_flag(); i++) {
unsigned i = 0;
for (; i < m_eq_propagation_queue.size() && !get_cancel_flag(); i++) {
new_eq & entry = m_eq_propagation_queue[i];
add_eq(entry.m_lhs, entry.m_rhs, entry.m_justification);
if (inconsistent())
return false;
}
TRACE("add_eq", tout << m_eq_propagation_queue.size() << " " << i << "\n";);
m_eq_propagation_queue.reset();
return true;
}
@ -1728,6 +1702,7 @@ namespace smt {
}
bool context::propagate() {
flet<bool> _prop(m_propagating, true);
TRACE("propagate", tout << "propagating... " << m_qhead << ":" << m_assigned_literals.size() << "\n";);
while (true) {
if (inconsistent())
@ -4449,7 +4424,7 @@ namespace smt {
void context::add_rec_funs_to_model() {
ast_manager& m = m_manager;
SASSERT(m_model);
if (!m_model) return;
for (unsigned i = 0; !get_cancel_flag() && i < m_asserted_formulas.get_num_formulas(); ++i) {
expr* e = m_asserted_formulas.get_formula(i);
if (is_quantifier(e)) {

1
src/smt/smt_context.h
View file

@ -923,6 +923,7 @@ namespace smt {
failure m_last_search_failure;
ptr_vector<theory> m_incomplete_theories; //!< theories that failed to produce a model
bool m_searching;
bool m_propagating;
unsigned m_num_conflicts;
unsigned m_num_conflicts_since_restart;
unsigned m_num_conflicts_since_lemma_gc;

8
src/smt/smt_model_generator.cpp
View file

@ -427,14 +427,8 @@ namespace smt {
}
tout << "\n";
tout << "value: #" << n->get_owner_id() << "\n" << mk_ismt2_pp(result, m_manager) << "\n";);
if (m_context->get_last_search_failure() == smt::THEORY) {
// if the theory solvers are incomplete, then we cannot assume the e-graph is close under congruence
if (fi->get_entry(args.c_ptr()) == nullptr)
fi->insert_new_entry(args.c_ptr(), result);
}
else {
if (fi->get_entry(args.c_ptr()) == nullptr)
fi->insert_new_entry(args.c_ptr(), result);
}
}
}
}

1
src/util/trace.cpp
View file

@ -20,6 +20,7 @@ Revision History:
#include "util/str_hashtable.h"
#ifdef _TRACE
std::ofstream tout(".z3-trace");
static bool g_enable_all_trace_tags = false;