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seq

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2015-12-08 16:03:24 -08:00
parent 932a3a8387
commit 6c2e7e7675
2 changed files with 164 additions and 76 deletions
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209
src/smt/theory_seq.cpp
View file

@ -25,12 +25,59 @@ Revision History:
using namespace smt;
void theory_seq::solution_map::update(expr* e, expr* r, enode_pair_dependency* d) {
std::pair<expr*, enode_pair_dependency*> value;
if (m_map.find(e, value)) {
m_updates.push_back(DEL);
m_lhs.push_back(e);
m_rhs.push_back(value.first);
m_deps.push_back(value.second);
}
value.first = r;
value.second = d;
m_map.insert(e, value);
m_updates.push_back(INS);
m_lhs.push_back(e);
m_rhs.push_back(value.first);
m_deps.push_back(value.second);
}
expr* theory_seq::solution_map::find(expr* e, enode_pair_dependency*& d) {
std::pair<expr*, enode_pair_dependency*> value;
if (m_map.find(e, value)) {
d = value.second;
return value.first;
}
else {
d = 0;
return e;
}
}
void theory_seq::solution_map::pop_scope(unsigned num_scopes) {
if (num_scopes == 0) return;
unsigned start = m_limit[m_limit.size() - num_scopes];
for (unsigned i = m_updates.size(); i > start; ) {
--i;
if (m_updates[i] == INS) {
m_map.remove(m_lhs[i].get());
}
else {
m_map.insert(m_lhs[i].get(), std::make_pair(m_rhs[i].get(), m_deps[i]));
}
}
m_updates.resize(start);
m_lhs.resize(start);
m_rhs.resize(start);
m_deps.resize(start);
m_limit.resize(m_limit.size() - num_scopes);
}
theory_seq::theory_seq(ast_manager& m):
theory(m.mk_family_id("seq")),
m(m),
m_dam(m_dep_array_value_manager, m_alloc),
m_rep(m),
m_eqs_head(0),
m_ineqs(m),
m_axioms(m),
m_axioms_head(0),
@ -38,8 +85,7 @@ theory_seq::theory_seq(ast_manager& m):
m_rewrite(m),
m_util(m),
m_autil(m),
m_trail_stack(*this),
m_find(*this) {
m_trail_stack(*this) {
m_lhs.push_back(expr_array());
m_rhs.push_back(expr_array());
m_deps.push_back(enode_pair_dependency_array());
@ -122,6 +168,9 @@ bool theory_seq::simplify_eq(expr* l, expr* r, enode_pair_dependency* deps) {
bool theory_seq::solve_unit_eq(expr* l, expr* r, enode_pair_dependency* deps) {
expr_ref lh = canonize(l, deps);
expr_ref rh = canonize(r, deps);
if (lh == rh) {
return true;
}
if (is_var(lh) && !occurs(lh, rh)) {
add_solution(lh, rh, deps);
return true;
@ -132,32 +181,55 @@ bool theory_seq::solve_unit_eq(expr* l, expr* r, enode_pair_dependency* deps) {
}
// Use instead reference counts for dependencies to GC?
// TBD: Solutions to units are not necessarily variables, but
// they may induce new equations.
return false;
}
bool theory_seq::occurs(expr* a, expr* b) {
// TBD
return true;
}
bool theory_seq::is_var(expr* a) {
// TBD
SASSERT(is_var(a));
// true if a occurs under an interpreted function or under left/right selector.
if (a == b) {
return true;
}
expr* e1, *e2;
if (m_util.str.is_concat(b, e1, e2)) {
return occurs(a, e1) || occurs(a, e2);
}
if (is_left_select(b, e1) || is_right_select(b, e1)) {
return occurs(a, e1);
}
return false;
}
bool theory_seq::is_var(expr* a) {
return is_uninterp(a);
}
bool theory_seq::is_left_select(expr* a, expr*& b) {
return false;
}
bool theory_seq::is_right_select(expr* a, expr*& b) {
return false;
}
void theory_seq::add_solution(expr* l, expr* r, enode_pair_dependency* deps) {
context& ctx = get_context();
// TBD: internalize lh, rh;
//
enode* n1 = ctx.get_enode(l);
enode* n2 = ctx.get_enode(r);
// TBD: add substitution l -> r
vector<enode_pair, false> _eqs;
m_dm.linearize(deps, _eqs);
// alloc?
ctx.assign_eq(n1, n2, eq_justification(
alloc(ext_theory_eq_propagation_justification,
get_id(), ctx.get_region(), 0, 0, _eqs.size(), _eqs.c_ptr(), n1, n2)));
m_rep.update(l, r, deps);
// TBD: skip new equalities for non-internalized terms.
if (ctx.e_internalized(l) && ctx.e_internalized(r)) {
enode* n1 = ctx.get_enode(l);
enode* n2 = ctx.get_enode(r);
vector<enode_pair, false> _eqs;
m_dm.linearize(deps, _eqs);
// alloc?
ctx.assign_eq(n1, n2, eq_justification(
alloc(ext_theory_eq_propagation_justification,
get_id(), ctx.get_region(), 0, 0, _eqs.size(), _eqs.c_ptr(), n1, n2)));
}
}
bool theory_seq::simplify_eqs() {
@ -237,6 +309,8 @@ bool theory_seq::internalize_term(app* term) {
}
if (!m_util.str.is_concat(term) &&
!m_util.str.is_string(term) &&
!m_util.str.is_empty(term) &&
!m_util.str.is_unit(term) &&
!m_util.str.is_suffix(term) &&
!m_util.str.is_prefix(term) &&
!m_util.str.is_contains(term)) {
@ -247,6 +321,13 @@ bool theory_seq::internalize_term(app* term) {
return true;
}
void theory_seq::apply_sort_cnstr(enode* n, sort* s) {
if (!is_attached_to_var(n)) {
mk_var(n);
}
}
void theory_seq::set_incomplete(app* term) {
TRACE("seq", tout << "No support for: " << mk_pp(term, m) << "\n";);
if (!m_incomplete) {
@ -257,8 +338,6 @@ void theory_seq::set_incomplete(app* term) {
theory_var theory_seq::mk_var(enode* n) {
theory_var r = theory::mk_var(n);
VERIFY(r == m_find.mk_var());
m_rep.push_back(n->get_owner());
return r;
}
@ -273,48 +352,29 @@ expr_ref theory_seq::canonize(expr* e, enode_pair_dependency*& eqs) {
}
expr_ref theory_seq::expand(expr* e, enode_pair_dependency*& eqs) {
context& ctx = get_context();
enode_pair_dependency* deps = 0;
e = m_rep.find(e, deps);
expr* e1, *e2;
SASSERT(ctx.e_internalized(e));
enode* n = ctx.get_enode(e);
enode* start = n;
do {
e = n->get_owner();
if (m_util.str.is_concat(e, e1, e2)) {
add_dependency(eqs, start, n);
return expr_ref(m_util.str.mk_concat(expand(e1, eqs), expand(e2, eqs)), m);
}
if (m_util.str.is_empty(e) || m_util.str.is_string(e)) {
add_dependency(eqs, start, n);
return expr_ref(e, m);
}
if (m.is_eq(e, e1, e2)) {
add_dependency(eqs, start, n);
return expr_ref(m.mk_eq(expand(e1, eqs), expand(e2, eqs)), m);
}
if (m_util.str.is_prefix(e, e1, e2)) {
add_dependency(eqs, start, n);
return expr_ref(m_util.str.mk_prefix(expand(e1, eqs), expand(e2, eqs)), m);
}
if (m_util.str.is_suffix(e, e1, e2)) {
add_dependency(eqs, start, n);
return expr_ref(m_util.str.mk_suffix(expand(e1, eqs), expand(e2, eqs)), m);
}
if (m_util.str.is_contains(e, e1, e2)) {
add_dependency(eqs, start, n);
return expr_ref(m_util.str.mk_contains(expand(e1, eqs), expand(e2, eqs)), m);
}
#if 0
if (m_util.str.is_unit(e)) {
// TBD: canonize the element.
if (start != n) eqs.push_back(enode_pair(start, n));
return expr_ref(e, m);
}
#endif
n = n->get_next();
eqs = join(eqs, deps);
if (m_util.str.is_concat(e, e1, e2)) {
return expr_ref(m_util.str.mk_concat(expand(e1, eqs), expand(e2, eqs)), m);
}
if (m_util.str.is_empty(e) || m_util.str.is_string(e)) {
return expr_ref(e, m);
}
while (n != start);
return expr_ref(n->get_root()->get_owner(), m);
if (m.is_eq(e, e1, e2)) {
return expr_ref(m.mk_eq(expand(e1, eqs), expand(e2, eqs)), m);
}
if (m_util.str.is_prefix(e, e1, e2)) {
return expr_ref(m_util.str.mk_prefix(expand(e1, eqs), expand(e2, eqs)), m);
}
if (m_util.str.is_suffix(e, e1, e2)) {
return expr_ref(m_util.str.mk_suffix(expand(e1, eqs), expand(e2, eqs)), m);
}
if (m_util.str.is_contains(e, e1, e2)) {
return expr_ref(m_util.str.mk_contains(expand(e1, eqs), expand(e2, eqs)), m);
}
return expr_ref(e, m);
}
void theory_seq::add_dependency(enode_pair_dependency*& dep, enode* a, enode* b) {
@ -415,12 +475,11 @@ void theory_seq::assign_eq(bool_var v, bool is_true) {
}
void theory_seq::new_eq_eh(theory_var v1, theory_var v2) {
m_find.merge(v1, v2);
expr_ref e1(m), e2(m);
e1 = get_enode(v1)->get_owner();
e2 = get_enode(v2)->get_owner();
m.push_back(m_lhs.back(), get_enode(v1)->get_owner());
m.push_back(m_rhs.back(), get_enode(v2)->get_owner());
enode* n1 = get_enode(v1);
enode* n2 = get_enode(v2);
m.push_back(m_lhs.back(), n1->get_owner());
m.push_back(m_rhs.back(), n2->get_owner());
m_dam.push_back(m_deps.back(), leaf(n1, n2));
}
void theory_seq::new_diseq_eh(theory_var v1, theory_var v2) {
@ -432,10 +491,10 @@ void theory_seq::new_diseq_eh(theory_var v1, theory_var v2) {
void theory_seq::push_scope_eh() {
theory::push_scope_eh();
m_rep.push_scope();
m_dm.push_scope();
m_trail_stack.push_scope();
m_trail_stack.push(value_trail<theory_seq, unsigned>(m_axioms_head));
m_trail_stack.push(value_trail<theory_seq, unsigned>(m_eqs_head));
expr_array lhs, rhs;
enode_pair_dependency_array deps;
m.copy(m_lhs.back(), lhs);
@ -450,7 +509,7 @@ void theory_seq::pop_scope_eh(unsigned num_scopes) {
m_trail_stack.pop_scope(num_scopes);
theory::pop_scope_eh(num_scopes);
m_dm.pop_scope(num_scopes);
m_rep.resize(get_num_vars());
m_rep.pop_scope(num_scopes);
while (num_scopes > 0) {
--num_scopes;
m.del(m_lhs.back());
@ -463,6 +522,16 @@ void theory_seq::pop_scope_eh(unsigned num_scopes) {
}
void theory_seq::restart_eh() {
SASSERT(m_lhs.size() == 1);
m.del(m_lhs.back());
m.del(m_rhs.back());
m_dam.del(m_deps.back());
m_lhs.reset();
m_rhs.reset();
m_deps.reset();
m_lhs.push_back(expr_array());
m_rhs.push_back(expr_array());
m_deps.push_back(enode_pair_dependency_array());
}

31
src/smt/theory_seq.h
View file

@ -46,6 +46,23 @@ namespace smt {
typedef union_find<theory_seq> th_union_find;
typedef trail_stack<theory_seq> th_trail_stack;
class solution_map {
enum map_update { INS, DEL };
ast_manager& m;
obj_map<expr, std::pair<expr*, enode_pair_dependency*> > m_map;
expr_ref_vector m_lhs, m_rhs;
ptr_vector<enode_pair_dependency> m_deps;
svector<map_update> m_updates;
unsigned_vector m_limit;
public:
solution_map(ast_manager& m): m(m), m_lhs(m), m_rhs(m) {}
void update(expr* e, expr* r, enode_pair_dependency* d);
expr* find(expr* e, enode_pair_dependency*& d);
void push_scope() { m_limit.push_back(m_updates.size()); }
void pop_scope(unsigned num_scopes);
};
struct stats {
stats() { reset(); }
void reset() { memset(this, 0, sizeof(stats)); }
@ -56,12 +73,9 @@ namespace smt {
enode_pair_dependency_array_config::value_manager m_dep_array_value_manager;
enode_pair_dependency_manager m_dm;
enode_pair_dependency_array_manager m_dam;
expr_ref_vector m_rep; // unification representative.
solution_map m_rep; // unification representative.
vector<expr_array> m_lhs, m_rhs; // persistent sets of equalities.
vector<enode_pair_dependency_array> m_deps;
unsigned m_eqs_head; // index of unprocessed equation. deprecate
vector<enode_pair_dependency_array> m_deps; // persistent sets of dependencies.
expr_ref_vector m_ineqs; // inequalities to check
@ -72,7 +86,6 @@ namespace smt {
seq_util m_util;
arith_util m_autil;
th_trail_stack m_trail_stack;
th_union_find m_find;
stats m_stats;
virtual final_check_status final_check_eh();
@ -90,6 +103,7 @@ namespace smt {
virtual theory* mk_fresh(context* new_ctx) { return alloc(theory_seq, new_ctx->get_manager()); }
virtual char const * get_name() const { return "seq"; }
virtual theory_var mk_var(enode* n);
virtual void apply_sort_cnstr(enode* n, sort* s);
bool check_ineqs();
bool pre_process_eqs(bool simplify_or_solve);
@ -101,6 +115,9 @@ namespace smt {
bool occurs(expr* a, expr* b);
bool is_var(expr* b);
void add_solution(expr* l, expr* r, enode_pair_dependency* dep);
bool is_left_select(expr* a, expr*& b);
bool is_right_select(expr* a, expr*& b);
final_check_status add_axioms();
@ -122,10 +139,12 @@ namespace smt {
mg.register_factory(alloc(seq_factory, get_manager(), get_family_id(), mg.get_model()));
}
#if 0
th_trail_stack & get_trail_stack() { return m_trail_stack; }
virtual void merge_eh(theory_var v1, theory_var v2, theory_var, theory_var);
static void after_merge_eh(theory_var r1, theory_var r2, theory_var v1, theory_var v2) {}
void unmerge_eh(theory_var v1, theory_var v2);
#endif
};
};