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add constructor preservation axiom to update-field

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This commit is contained in:
Nikolaj Bjorner 2020-05-01 11:09:55 -07:00
parent f8590634bd
commit 166be6c3b9
1 changed files with 24 additions and 21 deletions
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45
src/smt/theory_datatype.cpp
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@ -84,6 +84,17 @@ namespace smt {
*/
void theory_datatype::assert_eq_axiom(enode * lhs, expr * rhs, literal antecedent) {
ast_manager & m = get_manager();
if (antecedent != null_literal) {
std::function<void(void)> fn = [&]() {
app_ref body(m);
body = m.mk_eq(lhs->get_owner(), rhs);
body = m.mk_implies(get_context().bool_var2expr(antecedent.var()), body);
log_axiom_instantiation(body, 1, &lhs);
};
scoped_trace_stream _st(m, fn);
}
context & ctx = get_context();
if (m.proofs_enabled()) {
literal l(mk_eq(lhs->get_owner(), rhs, true));
@ -146,15 +157,6 @@ namespace smt {
}
expr_ref mk(m.mk_app(c, args), m);
std::function<void(void)> fn = [&]() {
app_ref body(m);
body = m.mk_eq(e, mk);
if (antecedent != null_literal) {
body = m.mk_implies(get_context().bool_var2expr(antecedent.var()), body);
}
log_axiom_instantiation(body, 1, &n);
};
scoped_trace_stream _st(m, fn);
assert_eq_axiom(n, mk, antecedent);
}
@ -183,13 +185,14 @@ namespace smt {
for (func_decl * acc : accessors) {
app_ref acc_app(m.mk_app(acc, n->get_owner()), m);
enode * arg = n->get_arg(i);
if (m.has_trace_stream()) {
std::function<void(void)> fn = [&]() {
app_ref body(m);
body = m.mk_eq(arg->get_owner(), acc_app);
log_axiom_instantiation(body, base_id + 3*i, bindings.size(), bindings.c_ptr(), base_id - 3, used_enodes);
}
};
scoped_trace_stream _st(m, fn);
assert_eq_axiom(arg, acc_app, null_literal);
if (m.has_trace_stream()) m.trace_stream() << "[end-of-instance]\n";
++i;
}
}
@ -220,6 +223,7 @@ namespace smt {
(=> (is-C r) (= (acc_j n) (acc_j r))) for acc_j != field
(=> (is-C r) (= (field n) v)) for acc_j != field
(=> (not (is-C r)) (= n r))
(=> (is-C r) (is-C n))
*/
void theory_datatype::assert_update_field_axioms(enode * n) {
m_stats.m_assert_update_field++;
@ -236,7 +240,7 @@ namespace smt {
app_ref rec_app(m.mk_app(rec, arg1), m);
app_ref acc_app(m);
ctx.internalize(rec_app, false);
literal is_con(ctx.get_bool_var(rec_app));
literal is_con(ctx.get_bool_var(rec_app));
for (func_decl* acc1 : accessors) {
enode* arg;
if (acc1 == acc) {
@ -248,19 +252,18 @@ namespace smt {
arg = ctx.get_enode(acc_app);
}
app_ref acc_own(m.mk_app(acc1, own), m);
if (m.has_trace_stream()) {
app_ref body(m);
body = m.mk_implies(rec_app, m.mk_eq(arg->get_owner(), acc_own));
log_axiom_instantiation(body, 1, &n);
}
assert_eq_axiom(arg, acc_own, is_con);
if (m.has_trace_stream()) m.trace_stream() << "[end-of-instance]\n";
}
// update_field is identity if 'n' is not created by a matching constructor.
app_ref imp(m.mk_implies(m.mk_not(rec_app), m.mk_eq(n->get_owner(), arg1)), m);
if (m.has_trace_stream()) log_axiom_instantiation(imp, 1, &n);
assert_eq_axiom(n, arg1, ~is_con);
if (m.has_trace_stream()) m.trace_stream() << "[end-of-instance]\n";
app_ref n_is_con(m.mk_app(rec, own), m);
ctx.internalize(n_is_con, false);
literal lits[2] = { ~is_con, literal(ctx.get_bool_var(n_is_con)) };
std::function<literal_vector(void)> fn = [&]() { return literal_vector(2, lits); };
scoped_trace_stream _st(*this, fn);
ctx.mk_th_axiom(get_id(), 2, lits);
}
theory_var theory_datatype::mk_var(enode * n) {