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regression fix, fix unicode mode

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This commit is contained in:
Nikolaj Bjorner 2021-01-21 22:06:15 -08:00
parent 64ba44d2ac
commit 4e8ba8b160
4 changed files with 63 additions and 63 deletions
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39
src/ast/seq_decl_plugin.cpp
View file

@ -1049,18 +1049,23 @@ bool seq_decl_plugin::is_considered_uninterpreted(func_decl * f) {
return util.str.is_nth_u(f);
}
bool seq_decl_plugin::is_unique_value(app* e) const {
if (is_app_of(e, m_family_id, OP_CHAR_CONST))
return true;
return false;
}
bool seq_decl_plugin::is_value(app* e) const {
while (true) {
if (is_app_of(e, m_family_id, OP_SEQ_EMPTY)) {
if (is_app_of(e, m_family_id, OP_SEQ_EMPTY))
return true;
}
if (is_app_of(e, m_family_id, OP_STRING_CONST)) {
if (is_app_of(e, m_family_id, OP_STRING_CONST))
return true;
if (is_app_of(e, m_family_id, OP_CHAR_CONST))
return true;
}
if (is_app_of(e, m_family_id, OP_SEQ_UNIT) &&
m_manager->is_value(e->get_arg(0))) {
m_manager->is_value(e->get_arg(0)))
return true;
}
if (is_app_of(e, m_family_id, OP_SEQ_CONCAT)) {
bool first = true;
for (expr* arg : *e) {
@ -1086,29 +1091,23 @@ bool seq_decl_plugin::are_equal(app* a, app* b) const {
}
bool seq_decl_plugin::are_distinct(app* a, app* b) const {
if (a == b) {
if (a == b)
return false;
}
if (is_app_of(a, m_family_id, OP_STRING_CONST) &&
is_app_of(b, m_family_id, OP_STRING_CONST)) {
is_app_of(b, m_family_id, OP_STRING_CONST))
return true;
if (is_app_of(a, m_family_id, OP_CHAR_CONST) &&
is_app_of(b, m_family_id, OP_CHAR_CONST))
return true;
}
if (is_app_of(a, m_family_id, OP_SEQ_UNIT) &&
is_app_of(b, m_family_id, OP_SEQ_UNIT)) {
is_app_of(b, m_family_id, OP_SEQ_UNIT))
return m_manager->are_distinct(a->get_arg(0), b->get_arg(0));
}
if (is_app_of(a, m_family_id, OP_SEQ_EMPTY) &&
is_app_of(b, m_family_id, OP_SEQ_UNIT)) {
is_app_of(b, m_family_id, OP_SEQ_UNIT))
return true;
}
if (is_app_of(b, m_family_id, OP_SEQ_EMPTY) &&
is_app_of(a, m_family_id, OP_SEQ_UNIT)) {
is_app_of(a, m_family_id, OP_SEQ_UNIT))
return true;
}
if (unicode() && is_app_of(a, m_family_id, OP_CHAR_CONST) &&
is_app_of(b, m_family_id, OP_CHAR_CONST)) {
return true;
}
return false;
}

2
src/ast/seq_decl_plugin.h
View file

@ -215,7 +215,7 @@ public:
bool is_value(app * e) const override;
bool is_unique_value(app * e) const override { return false; }
bool is_unique_value(app * e) const override;
bool are_equal(app* a, app* b) const override;

83
src/smt/seq_unicode.cpp
View file

@ -67,6 +67,8 @@ namespace smt {
ctx().internalize(ebits.c_ptr(), ebits.size(), true);
for (expr* arg : ebits)
bits.push_back(literal(ctx().get_bool_var(arg)));
for (literal bit : bits)
ctx().mark_as_relevant(bit);
}
void seq_unicode::internalize_le(literal lit, app* term) {
@ -102,7 +104,7 @@ namespace smt {
literal _eq = null_literal;
auto eq = [&]() {
if (_eq == null_literal)
_eq = th.mk_eq(th.get_expr(v), th.get_expr(w), false);
_eq = th.mk_literal(m.mk_eq(th.get_expr(v), th.get_expr(w)));
return _eq;
};
for (; i-- > 0; ) {
@ -158,7 +160,7 @@ namespace smt {
*/
bool seq_unicode::final_check() {
m_var2value.reset();
m_var2value.resize(th.get_num_vars(), 0);
m_var2value.resize(th.get_num_vars(), UINT_MAX);
m_value2var.reset();
// extract the initial set of constants.
@ -167,61 +169,58 @@ namespace smt {
bool requires_fix = false;
for (unsigned v = th.get_num_vars(); v-- > 0; ) {
expr* e = th.get_expr(v);
if (seq.is_char(e) && th.get_enode(v)->is_root() && get_value(v, c)) {
if (seq.is_char(e) && m_var2value[v] == UINT_MAX && get_value(v, c)) {
CTRACE("seq", seq.is_char(e), tout << mk_pp(e, m) << " root: " << th.get_enode(v)->is_root() << " is_value: " << get_value(v, c) << "\n";);
enode* r = th.get_enode(v)->get_root();
m_value2var.reserve(c + 1, null_theory_var);
theory_var u = m_value2var[c];
if (u != null_theory_var && r != th.get_enode(u)->get_root()) {
enforce_ackerman(u, v);
requires_fix = true;
continue;
}
if (c >= zstring::max_char()) {
enforce_value_bound(v);
requires_fix = true;
continue;
}
values.insert(c);
m_var2value[v] = c;
m_value2var.reserve(c + 1, null_theory_var);
theory_var w = m_value2var[c];
if (w != null_theory_var && th.get_enode(v)->get_root() != th.get_enode(w)->get_root()) {
enforce_ackerman(v, w);
requires_fix = true;
}
else {
m_value2var[c] = v;
}
for (enode* n : *th.get_enode(v)) {
theory_var w = n->get_th_var(th.get_id());
if (v != w && get_value(w, d) && d != c) {
enforce_ackerman(v, w);
for (enode* n : *r) {
u = n->get_th_var(th.get_id());
if (get_value(u, d) && d != c) {
enforce_ackerman(u, v);
requires_fix = true;
break;
}
m_var2value[u] = c;
}
values.insert(c);
m_value2var[c] = v;
}
}
if (requires_fix)
return false;
// assign values to roots
// assign values to other unassigned nodes
c = 'a';
for (unsigned v = th.get_num_vars(); v-- > 0; ) {
expr* e = th.get_expr(v);
if (!seq.is_char(e) || !th.get_enode(v)->is_root() || get_value(v, d))
continue;
d = c;
while (values.contains(c)) {
c = (c + 1) % zstring::max_char();
if (d == c) {
enforce_bits();
return false;
}
}
m_var2value[v] = c;
values.insert(c);
}
for (unsigned v = th.get_num_vars(); v-- > 0; ) {
expr* e = th.get_expr(v);
if (seq.is_char(e) && !th.get_enode(v)->is_root() && !get_value(v, d)) {
theory_var w = th.get_enode(v)->get_root()->get_th_var(th.get_id());
SASSERT(w != v && w != null_theory_var);
m_var2value[v] = m_var2value[w];
}
if (seq.is_char(e) && m_var2value[v] == UINT_MAX) {
d = c;
while (values.contains(c)) {
c = (c + 1) % zstring::max_char();
if (d == c) {
enforce_bits();
return false;
}
}
TRACE("seq", tout << "fresh: " << mk_pp(e, m) << " := " << c << "\n";);
for (enode* n : *th.get_enode(v))
m_var2value[n->get_th_var(th.get_id())] = c;
m_value2var.reserve(c + 1, null_theory_var);
m_value2var[c] = v;
values.insert(c);
}
}
return true;
}
@ -249,12 +248,14 @@ namespace smt {
void seq_unicode::enforce_ackerman(theory_var v, theory_var w) {
TRACE("seq", tout << "enforce ackerman " << v << " " << w << "\n";);
literal eq = th.mk_eq(th.get_expr(v), th.get_expr(w), false);
literal eq = th.mk_literal(m.mk_eq(th.get_expr(v), th.get_expr(w)));
ctx().mark_as_relevant(eq);
literal_vector lits;
auto& a = get_ebits(v);
auto& b = get_ebits(w);
for (unsigned i = a.size(); i-- > 0; ) {
literal beq = th.mk_eq(a[i], b[i], false);
ctx().mark_as_relevant(beq);
lits.push_back(~beq);
// eq => a = b
ctx().mk_th_axiom(th.get_id(), ~eq, beq);

2
src/smt/theory_seq.cpp
View file

@ -3192,7 +3192,7 @@ bool theory_seq::should_research(expr_ref_vector & unsat_core) {
IF_VERBOSE(1, verbose_stream() << "(smt.seq :increase-depth " << m_max_unfolding_depth << ")\n");
return true;
}
else if (k_min >= UINT_MAX/4) {
else if (k_min != UINT_MAX && k_min >= UINT_MAX/4) {
throw default_exception("reached max unfolding");
}