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make sure consequence generation works with interpreted atoms/terms

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-04-24 18:08:52 -07:00
parent 34acaa8f56
commit 48b62d34b7
2 changed files with 66 additions and 23 deletions
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83
src/smt/smt_consequences.cpp
View file

@ -44,13 +44,14 @@ namespace smt {
// - e is an equality between a variable and value that is to be fixed.
// - e is a data-type recognizer of a variable that is to be fixed.
//
void context::extract_fixed_consequences(literal lit, obj_map<expr, expr*>& vars, index_set const& assumptions, expr_ref_vector& conseq) {
void context::extract_fixed_consequences(literal lit, obj_map<expr, expr*>& vars, obj_map<expr, expr*> const& var2orig, index_set const& assumptions, expr_ref_vector& conseq) {
ast_manager& m = m_manager;
datatype_util dt(m);
expr* e1, *e2;
expr_ref fml(m);
if (lit == true_literal) return;
expr* e = bool_var2expr(lit.var());
TRACE("context", display(tout << mk_pp(e, m) << "\n"););
index_set s;
if (assumptions.contains(lit.var())) {
s.insert(lit.var());
@ -67,17 +68,23 @@ namespace smt {
bool found = false;
if (vars.contains(e)) {
found = true;
fml = lit.sign() ? m.mk_not(e) : e;
vars.erase(e);
e = var2orig.find(e);
fml = lit.sign() ? m.mk_not(e) : e;
}
else if (!lit.sign() && m.is_eq(e, e1, e2)) {
if (vars.contains(e2)) {
std::swap(e1, e2);
}
if (vars.contains(e1) && m.is_value(e2)) {
if (vars.contains(e2) && m.is_value(e1)) {
found = true;
vars.erase(e2);
e2 = var2orig.find(e2);
std::swap(e1, e2);
fml = m.mk_eq(e1, e2);
}
else if (vars.contains(e1) && m.is_value(e2)) {
found = true;
fml = e;
vars.erase(e1);
e1 = var2orig.find(e1);
fml = m.mk_eq(e1, e2);
}
}
else if (!lit.sign() && is_app(e) && dt.is_recognizer(to_app(e)->get_decl())) {
@ -94,6 +101,7 @@ namespace smt {
}
void context::justify(literal lit, index_set& s) {
ast_manager& m = m_manager;
b_justification js = get_justification(lit.var());
switch (js.get_kind()) {
case b_justification::CLAUSE: {
@ -119,6 +127,9 @@ namespace smt {
literal_vector literals;
m_conflict_resolution->justification2literals(js.get_justification(), literals);
for (unsigned j = 0; j < literals.size(); ++j) {
if (!m_antecedents.contains(literals[j].var())) {
TRACE("context", tout << literals[j] << " " << mk_pp(bool_var2expr(literals[j].var()), m) << "\n";);
}
s |= m_antecedents.find(literals[j].var());
}
break;
@ -126,13 +137,13 @@ namespace smt {
}
}
void context::extract_fixed_consequences(unsigned& start, obj_map<expr, expr*>& vars, index_set const& assumptions, expr_ref_vector& conseq) {
void context::extract_fixed_consequences(unsigned& start, obj_map<expr, expr*>& vars, obj_map<expr, expr*> const& var2orig, index_set const& assumptions, expr_ref_vector& conseq) {
pop_to_search_lvl();
SASSERT(!inconsistent());
literal_vector const& lits = assigned_literals();
unsigned sz = lits.size();
for (unsigned i = start; i < sz; ++i) {
extract_fixed_consequences(lits[i], vars, assumptions, conseq);
extract_fixed_consequences(lits[i], vars, var2orig, assumptions, conseq);
}
start = sz;
SASSERT(!inconsistent());
@ -202,7 +213,7 @@ namespace smt {
// Add a clause to short-circuit the congruence justifications for
// next rounds.
//
unsigned context::extract_fixed_eqs(obj_map<expr, expr*>& var2val, expr_ref_vector& conseq) {
unsigned context::extract_fixed_eqs(obj_map<expr, expr*>& var2val, obj_map<expr, expr*> const& var2orig, expr_ref_vector& conseq) {
TRACE("context", tout << "extract fixed consequences\n";);
ast_manager& m = m_manager;
ptr_vector<expr> to_delete;
@ -220,7 +231,7 @@ namespace smt {
s |= m_antecedents.find(literals[i].var());
}
fml = m.mk_eq(k, v);
fml = m.mk_eq(var2orig.find(k), v);
fml = m.mk_implies(antecedent2fml(s), fml);
conseq.push_back(fml);
to_delete.push_back(k);
@ -242,9 +253,13 @@ namespace smt {
literal context::mk_diseq(expr* e, expr* val) {
ast_manager& m = m_manager;
if (m.is_bool(e)) {
if (m.is_bool(e) && b_internalized(e)) {
return literal(get_bool_var(e), m.is_true(val));
}
else if (m.is_bool(e)) {
internalize_formula(e, false);
return literal(get_bool_var(e), !m.is_true(val));
}
else {
expr_ref eq(mk_eq_atom(e, val), m);
internalize_formula(eq, false);
@ -253,15 +268,39 @@ namespace smt {
}
lbool context::get_consequences(expr_ref_vector const& assumptions,
expr_ref_vector const& vars,
expr_ref_vector const& vars1,
expr_ref_vector& conseq,
expr_ref_vector& unfixed) {
m_antecedents.reset();
m_antecedents.insert(true_literal.var(), index_set());
pop_to_base_lvl();
ast_manager& m = m_manager;
expr_ref_vector vars(m);
obj_map<expr, expr*> var2orig;
bool pushed = false;
for (unsigned i = 0; i < vars1.size(); ++i) {
expr* v = vars1[i];
if (is_uninterp_const(v)) {
vars.push_back(v);
var2orig.insert(v, v);
}
else {
if (!pushed) {
pushed = true;
push();
}
expr_ref c(m.mk_fresh_const("v", m.get_sort(v)), m);
expr_ref eq(m.mk_eq(c, v), m);
assert_expr(eq);
vars.push_back(c);
var2orig.insert(c, v);
}
}
lbool is_sat = check(assumptions.size(), assumptions.c_ptr());
if (is_sat != l_true) {
TRACE("context", tout << is_sat << "\n";);
if (pushed) pop(1);
return is_sat;
}
@ -272,23 +311,22 @@ namespace smt {
}
model_ref mdl;
get_model(mdl);
ast_manager& m = m_manager;
expr_ref_vector trail(m);
model_evaluator eval(*mdl.get());
expr_ref val(m);
TRACE("context", model_pp(tout, *mdl););
for (unsigned i = 0; i < vars.size(); ++i) {
eval(vars[i], val);
eval(vars[i].get(), val);
if (m.is_value(val)) {
trail.push_back(val);
var2val.insert(vars[i], val);
var2val.insert(vars[i].get(), val);
}
else {
unfixed.push_back(vars[i]);
unfixed.push_back(vars[i].get());
}
}
unsigned num_units = 0;
extract_fixed_consequences(num_units, var2val, _assumptions, conseq);
extract_fixed_consequences(num_units, var2val, var2orig, _assumptions, conseq);
app_ref eq(m);
TRACE("context",
tout << "vars: " << vars.size() << "\n";
@ -303,6 +341,7 @@ namespace smt {
unsigned num_vars = 0;
for (; it != end && num_vars < chunk_size; ++it) {
if (get_cancel_flag()) {
if (pushed) pop(1);
return l_undef;
}
expr* e = it->m_key;
@ -332,6 +371,7 @@ namespace smt {
while (true) {
is_sat = bounded_search();
if (is_sat != l_true && m_last_search_failure != OK) {
if (pushed) pop(1);
return is_sat;
}
if (is_sat == l_undef) {
@ -349,8 +389,8 @@ namespace smt {
if (is_sat == l_true) {
delete_unfixed(var2val, unfixed);
}
extract_fixed_consequences(num_units, var2val, _assumptions, conseq);
num_fixed_eqs += extract_fixed_eqs(var2val, conseq);
extract_fixed_consequences(num_units, var2val, var2orig, _assumptions, conseq);
num_fixed_eqs += extract_fixed_eqs(var2val, var2orig, conseq);
IF_VERBOSE(1, display_consequence_progress(verbose_stream(), num_iterations, var2val.size(), conseq.size(),
unfixed.size(), num_fixed_eqs););
TRACE("context", display_consequence_progress(tout, num_iterations, var2val.size(), conseq.size(),
@ -359,6 +399,9 @@ namespace smt {
end_search();
DEBUG_CODE(validate_consequences(assumptions, vars, conseq, unfixed););
if (pushed) {
pop(1);
}
return l_true;
}

6
src/smt/smt_context.h
View file

@ -1377,14 +1377,14 @@ namespace smt {
typedef hashtable<unsigned, u_hash, u_eq> index_set;
//typedef uint_set index_set;
u_map<index_set> m_antecedents;
void extract_fixed_consequences(literal lit, obj_map<expr, expr*>& var2val, index_set const& assumptions, expr_ref_vector& conseq);
void extract_fixed_consequences(unsigned& idx, obj_map<expr, expr*>& var2val, index_set const& assumptions, expr_ref_vector& conseq);
void extract_fixed_consequences(literal lit, obj_map<expr, expr*>& var2val, obj_map<expr, expr*> const& var2orig, index_set const& assumptions, expr_ref_vector& conseq);
void extract_fixed_consequences(unsigned& idx, obj_map<expr, expr*>& var2val, obj_map<expr, expr*> const& var2orig, index_set const& assumptions, expr_ref_vector& conseq);
void display_consequence_progress(std::ostream& out, unsigned it, unsigned nv, unsigned fixed, unsigned unfixed, unsigned eq);
unsigned delete_unfixed(obj_map<expr, expr*>& var2val, expr_ref_vector& unfixed);
unsigned extract_fixed_eqs(obj_map<expr, expr*>& var2val, expr_ref_vector& conseq);
unsigned extract_fixed_eqs(obj_map<expr, expr*>& var2val, obj_map<expr, expr*> const& var2orig, expr_ref_vector& conseq);
expr_ref antecedent2fml(index_set const& ante);