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https://github.com/Z3Prover/z3
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WIP add axioms
This commit is contained in:
Murphy Berzish
parent
992fff8ba8
commit
4d5a0ea53f
4 changed files with 120 additions and 40 deletions
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@ -34,22 +34,25 @@ theory_str::theory_str(ast_manager & m):
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theory_str::~theory_str() {
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}
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void theory_str::assert_axiom(unsigned num_lits, literal * lits) {
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void theory_str::assert_axiom(ast * a) {
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/*
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if (search_started) {
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// effectively Z3_theory_assert_axiom
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NOT_IMPLEMENTED_YET();
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} else {
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// effectively Z3_assert_cnstr
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context & ctx = get_context();
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ctx.assert_expr(to_expr(a));
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}
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*/
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TRACE("t_str_detail", tout << "asserting " << mk_ismt2_pp(a, get_manager()) << "\n";);
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expr * e = to_expr(a);
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context & ctx = get_context();
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TRACE("t_str_detail",
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tout << "assert_axiom: literals:\n";
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for (unsigned i = 0; i < num_lits; ++i) {
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expr * e = ctx.bool_var2expr(lits[i].var());
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if (lits[i].sign())
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tout << "not ";
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tout << mk_pp(e, get_manager()) << " ";
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tout << "\n";
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});
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ctx.mk_th_axiom(get_id(), num_lits, lits);
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}
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void theory_str::assert_axiom(literal l) {
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assert_axiom(1, &l);
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ctx.internalize(e, false);
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literal lit(ctx.get_literal(e));
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ctx.mark_as_relevant(lit);
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ctx.mk_th_axiom(get_id(), 1, &lit);
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TRACE("t_str_detail", tout << "done asserting " << mk_ismt2_pp(a, get_manager()) << "\n";);
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}
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bool theory_str::internalize_atom(app * atom, bool gate_ctx) {
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@ -93,15 +96,17 @@ bool theory_str::internalize_term(app * term) {
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attach_new_th_var(e);
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/*
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if (is_concat(term)) {
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instantiate_concat_axiom(e);
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}
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*/
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return true;
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}
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app * theory_str::mk_strlen(app * e) {
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if (m_strutil.is_string(e)) {
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/*if (m_strutil.is_string(e)) {*/ if (false) {
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const char * strval = 0;
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m_strutil.is_string(e, &strval);
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int len = strlen(strval);
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@ -145,22 +150,90 @@ void theory_str::instantiate_concat_axiom(enode * cat) {
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SASSERT(len_y);
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// now build len_x + len_y
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app * len_x_plus_len_y = m_autil.mk_add(len_x, len_y);
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expr_ref len_x_plus_len_y(m);
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len_x_plus_len_y = m_autil.mk_add(len_x, len_y);
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SASSERT(len_x_plus_len_y);
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TRACE("t_str", tout << mk_bounded_pp(len_xy, m) << " = " << mk_bounded_pp(len_x_plus_len_y, m) << "\n";);
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// finally assert equality between the two subexpressions
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literal l(mk_eq(len_xy, len_x_plus_len_y, true));
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ctx.mark_as_relevant(l);
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assert_axiom(l);
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app * eq = m.mk_eq(len_xy, len_x_plus_len_y);
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SASSERT(eq);
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TRACE("t_str", tout << mk_bounded_pp(eq, m) << std::endl;);
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assert_axiom(eq);
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}
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/*
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* Add axioms that are true for any string variable:
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* 1. Length(x) >= 0
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* 2. Length(x) == 0 <=> x == ""
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*/
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void theory_str::instantiate_basic_string_axioms(enode * str) {
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// generate a stronger axiom for constant strings
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if (m_strutil.is_string(str->get_owner())) {
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// TODO
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} else {
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// TODO keep track of which enodes we have added axioms for, so we don't add the same ones twice?
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app * a_str = str->get_owner();
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context & ctx = get_context();
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ast_manager & m = get_manager();
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// TODO find out why these are crashing the SMT solver
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// build axiom 1: Length(a_str) >= 0
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{
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// build LHS
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expr_ref len_str(m);
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len_str = mk_strlen(a_str);
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SASSERT(len_str);
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// build RHS
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expr_ref zero(m);
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zero = m_autil.mk_numeral(rational(0), true);
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SASSERT(zero);
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// build LHS >= RHS and assert
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app * lhs_ge_rhs = m_autil.mk_ge(len_str, zero);
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SASSERT(lhs_ge_rhs);
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// TODO verify that this works
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TRACE("t_str_detail", tout << "string axiom 1: " << mk_bounded_pp(lhs_ge_rhs, m) << std::endl;);
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assert_axiom(lhs_ge_rhs);
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}
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/*
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// build axiom 2: Length(a_str) == 0 <=> a_str == ""
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{
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// build LHS of iff
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expr_ref len_str(m);
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len_str = mk_strlen(a_str);
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SASSERT(len_str);
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expr_ref zero(m);
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zero = m_autil.mk_numeral(rational(0), true);
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SASSERT(zero);
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expr_ref lhs(m);
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lhs = ctx.mk_eq_atom(len_str, zero);
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SASSERT(lhs);
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// build RHS of iff
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expr_ref empty_str(m);
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empty_str = m_strutil.mk_string("");
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SASSERT(empty_str);
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expr_ref rhs(m);
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rhs = ctx.mk_eq_atom(a_str, empty_str);
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SASSERT(rhs);
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// build LHS <=> RHS and assert
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TRACE("t_str_detail", tout << "string axiom 2: " << mk_bounded_pp(lhs, m) << " <=> " << mk_bounded_pp(rhs, m) << std::endl;);
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// TODO this is kind of a hack, maybe just ctx.assert_expr() will be enough?
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literal l(mk_eq(lhs, rhs, true));
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ctx.mark_as_relevant(l);
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assert_axiom(l);
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}
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*/
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}
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}
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void theory_str::attach_new_th_var(enode * n) {
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context & ctx = get_context();
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theory_var v = mk_var(n);
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ctx.attach_th_var(n, this, v);
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TRACE("t_str_detail", tout << "new theory var: " << mk_ismt2_pp(n->get_owner(), get_manager()) << " := " << v << "\n";);
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TRACE("t_str_detail", tout << "new theory var: " << mk_ismt2_pp(n->get_owner(), get_manager()) << " := v#" << v << std::endl;);
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// probably okay...note however that this seems to miss constants and functions
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//instantiate_basic_string_axioms(n);
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}
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void theory_str::init_search_eh() {
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@ -180,14 +253,14 @@ void theory_str::init_search_eh() {
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void theory_str::new_eq_eh(theory_var x, theory_var y) {
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// TODO
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TRACE("t_str", tout << "new eq: " << x << " = " << y << std::endl;);
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TRACE("t_str", tout << "new eq: v#" << x << " = v#" << y << std::endl;);
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TRACE("t_str_detail", tout << mk_ismt2_pp(get_enode(x)->get_owner(), get_manager()) << " = " <<
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mk_ismt2_pp(get_enode(y)->get_owner(), get_manager()) << std::endl;);
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}
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void theory_str::new_diseq_eh(theory_var x, theory_var y) {
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// TODO
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TRACE("t_str", tout << "new diseq: " << x << " != " << y << std::endl;);
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TRACE("t_str", tout << "new diseq: v#" << x << " != v#" << y << std::endl;);
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TRACE("t_str_detail", tout << mk_ismt2_pp(get_enode(x)->get_owner(), get_manager()) << " != " <<
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mk_ismt2_pp(get_enode(y)->get_owner(), get_manager()) << std::endl;);
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}
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@ -198,7 +271,7 @@ void theory_str::relevant_eh(app * n) {
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void theory_str::assign_eh(bool_var v, bool is_true) {
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context & ctx = get_context();
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TRACE("t_str", tout << "assert: v" << v << " #" << ctx.bool_var2expr(v)->get_id() << " is_true: " << is_true << "\n";);
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TRACE("t_str", tout << "assert: v" << v << " #" << ctx.bool_var2expr(v)->get_id() << " is_true: " << is_true << std::endl;);
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}
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void theory_str::push_scope_eh() {
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