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introducing scoped detacth/attach of clauses to enforce basic sat solver invariants. Part of investigating #939:

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-03-22 14:12:47 -07:00
parent 25d839ed10
commit e47e8c67c0
5 changed files with 42 additions and 24 deletions
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24
src/sat/sat_solver.cpp
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@ -462,25 +462,25 @@ namespace sat {
return simplify_clause_core<false>(num_lits, lits);
}
void solver::dettach_bin_clause(literal l1, literal l2, bool learned) {
void solver::detach_bin_clause(literal l1, literal l2, bool learned) {
get_wlist(~l1).erase(watched(l2, learned));
get_wlist(~l2).erase(watched(l1, learned));
}
void solver::dettach_clause(clause & c) {
void solver::detach_clause(clause & c) {
if (c.size() == 3)
dettach_ter_clause(c);
detach_ter_clause(c);
else
dettach_nary_clause(c);
detach_nary_clause(c);
}
void solver::dettach_nary_clause(clause & c) {
void solver::detach_nary_clause(clause & c) {
clause_offset cls_off = get_offset(c);
erase_clause_watch(get_wlist(~c[0]), cls_off);
erase_clause_watch(get_wlist(~c[1]), cls_off);
}
void solver::dettach_ter_clause(clause & c) {
void solver::detach_ter_clause(clause & c) {
erase_ternary_watch(get_wlist(~c[0]), c[1], c[2]);
erase_ternary_watch(get_wlist(~c[1]), c[0], c[2]);
erase_ternary_watch(get_wlist(~c[2]), c[0], c[1]);
@ -1493,7 +1493,7 @@ namespace sat {
for (unsigned i = new_sz; i < sz; i++) {
clause & c = *(m_learned[i]);
if (can_delete(c)) {
dettach_clause(c);
detach_clause(c);
del_clause(c);
}
else {
@ -1551,7 +1551,7 @@ namespace sat {
else {
c.inc_inact_rounds();
if (c.inact_rounds() > m_config.m_gc_k) {
dettach_clause(c);
detach_clause(c);
del_clause(c);
m_stats.m_gc_clause++;
deleted++;
@ -1562,7 +1562,7 @@ namespace sat {
if (psm(c) > static_cast<unsigned>(c.size() * m_min_d_tk)) {
// move to frozen;
TRACE("sat_frozen", tout << "freezing size: " << c.size() << " psm: " << psm(c) << " " << c << "\n";);
dettach_clause(c);
detach_clause(c);
c.reset_inact_rounds();
c.freeze();
m_num_frozen++;
@ -2595,7 +2595,7 @@ namespace sat {
}
else {
clause & c = *(cw.get_clause());
dettach_clause(c);
detach_clause(c);
attach_clause(c, reinit);
if (scope_lvl() > 0 && reinit) {
// clause propagated literal, must keep it in the reinit stack.
@ -2628,7 +2628,7 @@ namespace sat {
for (unsigned i = 0; i < clauses.size(); ++i) {
clause & c = *(clauses[i]);
if (c.contains(lit)) {
dettach_clause(c);
detach_clause(c);
del_clause(c);
}
else {
@ -2646,7 +2646,7 @@ namespace sat {
literal l1 = m_user_bin_clauses[i].first;
literal l2 = m_user_bin_clauses[i].second;
if (nlit == l1 || nlit == l2) {
dettach_bin_clause(l1, l2, learned);
detach_bin_clause(l1, l2, learned);
}
}
}