예제 #1
0
    virtual void operator()(goal_ref const & in,
                            goal_ref_buffer & result,
                            model_converter_ref & mc,
                            proof_converter_ref & pc,
                            expr_dependency_ref & core) {

        bool models_enabled = in->models_enabled();
        bool proofs_enabled = in->proofs_enabled();
        bool cores_enabled  = in->unsat_core_enabled();

        ast_manager & m = in->m();
        goal_ref_buffer      r1;
        model_converter_ref mc1;
        proof_converter_ref pc1;
        expr_dependency_ref core1(m);
        result.reset();
        mc   = 0;
        pc   = 0;
        core = 0;
        m_t1->operator()(in, r1, mc1, pc1, core1);
        SASSERT(!is_decided(r1) || (!pc1 && !core1)); // the pc and core of decided goals is 0
        unsigned r1_size = r1.size();
        SASSERT(r1_size > 0);
        checkpoint();
        if (r1_size == 1) {
            if (r1[0]->is_decided()) {
                result.push_back(r1[0]);
                if (models_enabled) mc = mc1;
                SASSERT(!pc); SASSERT(!core);
                return;
            }
            goal_ref r1_0 = r1[0];
            m_t2->operator()(r1_0, result, mc, pc, core);
            if (models_enabled) mc = concat(mc1.get(), mc.get());
            if (proofs_enabled) pc = concat(pc1.get(), pc.get());
            if (cores_enabled) core = m.mk_join(core1.get(), core);
        }
        else {
            if (cores_enabled) core = core1;
            proof_converter_ref_buffer pc_buffer;
            model_converter_ref_buffer mc_buffer;
            sbuffer<unsigned>          sz_buffer;
            goal_ref_buffer            r2;
            for (unsigned i = 0; i < r1_size; i++) {
                checkpoint();
                goal_ref g = r1[i];
                r2.reset();
                model_converter_ref mc2;
                proof_converter_ref pc2;
                expr_dependency_ref  core2(m);
                m_t2->operator()(g, r2, mc2, pc2, core2);
                if (is_decided(r2)) {
                    SASSERT(r2.size() == 1);
                    if (is_decided_sat(r2)) {
                        // found solution...
                        result.push_back(r2[0]);
                        if (models_enabled) {
                            // mc2 contains the actual model
                            model_ref md;
                            md = alloc(model, m);
                            apply(mc2, md, 0);
                            apply(mc1, md, i);
                            mc   = model2model_converter(md.get());
                        }
                        SASSERT(!pc); SASSERT(!core);
                        return;
                    }
                    else {
                        SASSERT(is_decided_unsat(r2));
                        // the proof and unsat core of a decided_unsat goal are stored in the node itself.
                        // pc2 and core2 must be 0.
                        SASSERT(!pc2);
                        SASSERT(!core2);
                        if (models_enabled) mc_buffer.push_back(0);
                        if (proofs_enabled) pc_buffer.push_back(proof2proof_converter(m, r2[0]->pr(0)));
                        if (models_enabled || proofs_enabled) sz_buffer.push_back(0);
                        if (cores_enabled) core = m.mk_join(core.get(), r2[0]->dep(0));
                    }
                }
                else {
                    result.append(r2.size(), r2.c_ptr());
                    if (models_enabled) mc_buffer.push_back(mc2.get());
                    if (proofs_enabled) pc_buffer.push_back(pc2.get());
                    if (models_enabled || proofs_enabled) sz_buffer.push_back(r2.size());
                    if (cores_enabled) core = m.mk_join(core.get(), core2.get());
                }
            }

            if (result.empty()) {
                // all subgoals were shown to be unsat.
                // create an decided_unsat goal with the proof
                in->reset_all();
                proof_ref pr(m);
                if (proofs_enabled)
                    apply(m, pc1, pc_buffer, pr);
                SASSERT(cores_enabled || core == 0);
                in->assert_expr(m.mk_false(), pr, core);
                core = 0;
                result.push_back(in.get());
                SASSERT(!mc); SASSERT(!pc); SASSERT(!core);
            }
            else {
                if (models_enabled) mc = concat(mc1.get(), mc_buffer.size(), mc_buffer.c_ptr(), sz_buffer.c_ptr());
                if (proofs_enabled) pc = concat(pc1.get(), pc_buffer.size(), pc_buffer.c_ptr(), sz_buffer.c_ptr());
                SASSERT(cores_enabled || core == 0);
            }
        }
    }
예제 #2
0
bool goal::is_decided() const { 
    return is_decided_sat() || is_decided_unsat();
}