mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-07-19 10:52:02 +00:00
Code Activity

prepare term-graph unit testing

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-06-09 17:59:49 -07:00 • committed by Arie Gurfinkel
parent 362d9258a4
commit da18f0e0b7
3 changed files with 103 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

76
src/qe/qe_term_graph.cpp
View file

@ -365,10 +365,12 @@ term *term_graph::mk_term(expr *a) {
return t;
}
term *term_graph::internalize_term(expr *t) {
term* term_graph::internalize_term(expr *t) {
term* res = get_term(t);
if (res) return res;
ptr_buffer<expr> todo;
todo.push_back(t);
term* res = nullptr;
while (!todo.empty()) {
term* res = get_term(t);
if (res) {
@ -390,9 +392,7 @@ term *term_graph::internalize_term(expr *t) {
}
void term_graph::internalize_eq(expr *a1, expr* a2) {
internalize_term(a1);
internalize_term(a2);
merge(get_term(a1)->get_root(), get_term(a2)->get_root());
merge(internalize_term(a1)->get_root(), internalize_term(a2)->get_root());
}
void term_graph::internalize_lit(expr* lit) {
@ -600,9 +600,25 @@ void term_graph::reset() {
m_lits.reset();
}
expr_ref term_graph::mk_pure(term& t) {
expr* e = t.get_app();
if (m_term2app.find(t.get_id(), e)) return expr_ref(e, m);
if (!is_app(e)) return expr_ref(m);
app* a = ::to_app(e);
expr_ref_vector kids(m);
for (term* ch : term::children(t)) {
if (!ch->get_root().is_marked()) return expr_ref(m);
kids.push_back(mk_pure(ch->get_root()));
}
expr_ref result(m.mk_app(a->get_decl(), kids.size(), kids.c_ptr()), m);
m_pinned.push_back(result);
m_term2app.insert(t.get_id(), result);
return result;
}
expr_ref_vector term_graph::project(func_decl_ref_vector const& decls, bool exclude) {
uint_set _decls;
for (func_decl* f : decls) _decls.insert(f->get_id());
u_map<bool> _decls;
for (func_decl* f : decls) _decls.insert(f->get_id(), true);
// . propagate representatives up over parents.
// use work-list + marking to propagate.
// . produce equalities over represented classes.
@ -632,7 +648,8 @@ expr_ref_vector term_graph::project(func_decl_ref_vector const& decls, bool excl
// make this the new root.
term* r = t;
do {
r->set_root(*t);
r->set_root(*t); // TBD: invalidates hash-table, only one-shot
// TBD: optimize worklist traversal?
for (term* p : term::parents(r)) {
worklist.push_back(p);
}
@ -641,12 +658,47 @@ expr_ref_vector term_graph::project(func_decl_ref_vector const& decls, bool excl
while (t != r);
t->set_mark(true);
}
// Now, marked roots in m_terms can be used in projection
// marked roots in m_terms can be used in projection
// walk each root. Then traverse each term in the equivalence class
// create pure variant of the terms (if possible)
// equate t0 (that comes from the root, which can be purified)
// with any other t1.
expr_ref_vector result(m);
m_term2app.reset();
m_pinned.reset();
for (term * t : m_terms) {
if (!t->is_root() || !t->is_marked() || t->get_class_size() == 1) continue;
term* r = t;
expr_ref t0 = mk_pure(*t);
SASSERT(t0);
obj_hashtable<expr> roots;
roots.insert(t0);
for (term* r = &t->get_next(); r != t; r = &r->get_next()) {
// main symbol of term must be consistent with what is included/excluded
if (exclude != _decls.contains(r->get_decl_id())) {
continue;
}
expr_ref t1 = mk_pure(*r);
if (t1 && !roots.contains(t1)) {
result.push_back(m.mk_eq(t0, t1));
roots.insert(t1);
}
}
}
// walk disequalities and expose projected disequality
for (expr* e : m_lits) {
expr* e1 = nullptr, *e2 = nullptr;
if (m.is_not(e, e) && m.is_eq(e, e1, e2)) {
expr_ref t1 = mk_pure(*get_term(e1));
expr_ref t2 = mk_pure(*get_term(e2));
if (t1 && t2) {
result.push_back(m.mk_not(m.mk_eq(t1, t2)));
}
}
}
reset_marks();
NOT_IMPLEMENTED_YET();
m_term2app.reset();
m_pinned.reset();
return result;
}