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CEisenhofer 2026-04-14 11:47:26 +02:00
parent acae332b13
commit ed4387c70e
2 changed files with 65 additions and 12 deletions
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27
src/smt/theory_nseq.cpp
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@ -589,7 +589,7 @@ namespace smt {
// Always assert non-negativity for all string theory vars,
// even when there are no string equations/memberships.
if (assert_nonneg_for_all_vars()) {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: nonneg assertions added, FC_CONTINUE\n";);
TRACE(seq, tout << "nseq final_check: nonneg assertions added, FC_CONTINUE\n");
return FC_CONTINUE;
}
@ -600,7 +600,7 @@ namespace smt {
// there is nothing to do for the string solver, as there are no string constraints
if (!has_eq_or_mem && m_ho_terms.empty() && !has_unhandled_preds()) {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: empty state+ho, FC_DONE (no solve)\n";);
TRACE(seq, tout << "nseq final_check: empty state+ho, FC_DONE (no solve)\n");
m_nielsen.reset();
m_nielsen.create_root();
m_nielsen.set_sat_node(m_nielsen.root());
@ -612,20 +612,20 @@ namespace smt {
// There is an existing nielsen graph with a satisfying assignment.
if (!m_nielsen_literals.empty() && m_nielsen.sat_node() != nullptr &&
all_of(m_nielsen_literals, [&](auto lit) { return l_true == ctx.get_assignment(lit); })) {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: satifiable state revisited\n");
TRACE(seq, tout << "nseq final_check: satifiable state revisited\n");
// Re-run solving/model extraction instead of early exiting on a
// cached SAT node. This avoids stale sat paths after additional
// SAT assignments were introduced in prior FC_CONTINUE rounds.
}
}
// unfold higher-order terms when sequence structure is known
if (unfold_ho_terms()) {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: unfolded ho_terms, FC_CONTINUE\n";);
TRACE(seq, tout << "nseq final_check: unfolded ho_terms, FC_CONTINUE\n");
return FC_CONTINUE;
}
if (!has_eq_or_mem && !has_unhandled_preds()) {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: empty state (after ho), FC_DONE (no solve)\n";);
TRACE(seq, tout << "nseq final_check: empty state (after ho), FC_DONE (no solve)\n");
m_nielsen.reset();
m_nielsen.create_root();
m_nielsen.set_sat_node(m_nielsen.root());
@ -637,7 +637,7 @@ namespace smt {
// assert length constraints derived from string equalities
if (assert_length_constraints()) {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: length constraints asserted, FC_CONTINUE\n";);
TRACE(seq, tout << "nseq final_check: length constraints asserted, FC_CONTINUE\n");
return FC_CONTINUE;
}
@ -656,15 +656,15 @@ namespace smt {
switch (check_regex_memberships_precheck()) {
case l_true:
// conflict was asserted inside check_regex_memberships_precheck
IF_VERBOSE(1, verbose_stream() << "nseq final_check: regex precheck UNSAT\n";);
TRACE(seq, tout << "nseq final_check: regex precheck UNSAT\n");
return FC_CONTINUE;
case l_false:
// all regex constraints satisfiable, no word eqs → SAT
IF_VERBOSE(1, verbose_stream() << "nseq final_check: regex precheck SAT\n";);
TRACE(seq, tout << "nseq final_check: regex precheck SAT\n");
m_nielsen.set_sat_node(m_nielsen.root());
if (!check_length_coherence())
return FC_CONTINUE;
TRACE(seq, display(tout << "pre-check done\n"));
TRACE(seq, tout << "pre-check done\n");
return FC_DONE;
default:
break;
@ -674,7 +674,7 @@ namespace smt {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: calling solve()\n";);
// here the actual Nielsen solving happens
auto result = m_nielsen.solve();
auto result = m_nielsen.solve(); std::cout << "Solve returned " << (int)result << std::endl;
#ifdef Z3DEBUG
// Examining the Nielsen graph is probably the best way of debugging
@ -685,6 +685,7 @@ namespace smt {
if (result == seq::nielsen_graph::search_result::unsat) {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: solve UNSAT\n";);
TRACE(seq, tout << "nseq final_check: solve UNSAT\n");
explain_nielsen_conflict();
return FC_CONTINUE;
}
@ -692,6 +693,8 @@ namespace smt {
if (result == seq::nielsen_graph::search_result::sat) {
IF_VERBOSE(1, verbose_stream() << "nseq final_check: solve SAT, sat_node="
<< (m_nielsen.sat_node() ? "set" : "null") << "\n";);
TRACE(seq, tout << "nseq final_check: solve SAT, sat_node="
<< (m_nielsen.sat_node() ? "set" : "null") << "\n");
// Nielsen found a consistent assignment for positive constraints.
SASSERT(has_eq_or_mem); // we should have axiomatized them
@ -699,7 +702,7 @@ namespace smt {
// If assumptions remain undefined, returning SAT can yield
// unsound/invalid models because the chosen Nielsen branch
// is not yet committed in the outer SAT core.
IF_VERBOSE(1, verbose_stream() << "nseq final_check: unresolved assumptions, FC_GIVEUP\n";);
TRACE(seq, tout << "nseq final_check: unresolved assumptions, FC_GIVEUP\n");
return FC_GIVEUP;
}