Exemple #1
0
bool
ModelValidator::isValid(z3::expr smt_expr, const std::vector<double>& model)
{
    auto var_symbols = m_ir_gen->getVars();
    assert((var_symbols.size() == model.size()) && "Model size mismatch!");

    // now substituting fpa wrapped variables with consts from model
    z3::expr_vector src_1(smt_expr.ctx()), dst_1(smt_expr.ctx());
    for (const auto& symbol_pair:m_ir_gen->getVarsFPAWrapped()) {
        src_1.push_back(*symbol_pair.first->expr());
        // XXX: assuming TO_FPA should invert type casting
        auto kind = symbol_pair.second->kind() == SymbolKind::kFP32Var
                    ? SymbolKind::kFP64Var : SymbolKind::kFP32Var;
        dst_1.push_back(genFPConst(smt_expr, kind,
                                   symbol_pair.second->id(), model));
    }
    z3::expr expr_sub_1 = smt_expr.substitute(src_1, dst_1);

    // now substituting actual variables with consts from model
    z3::expr_vector src_2(smt_expr.ctx()), dst_2(smt_expr.ctx());
    for (const auto symbol:var_symbols) {
        src_2.push_back(*symbol->expr());
        dst_2.push_back(genFPConst(smt_expr, symbol->kind(),
                                   symbol->id(), model));
    }
    z3::expr expr_sub_2 = expr_sub_1.substitute(src_2, dst_2);
    z3::solver solver(smt_expr.ctx());
    solver.add(expr_sub_2);
    return solver.check() == z3::check_result::sat;
}
Exemple #2
0
z3::expr ite(z3::expr const & c, z3::expr const & t, z3::expr const & e)
{
  check_context(c, t); check_context(c, e);
  assert(c.is_bool());
  Z3_ast r = Z3_mk_ite(c.ctx(), c, t, e);
  c.check_error();
  return z3::expr(c.ctx(), r);
}
 z3::expr operator()(const z3::expr& v1, const z3::expr& v2)
 {
     z3::context& ctxt = v1.ctx();
     z3::expr zero(ctxt.bv_val(0, v1.get_sort().bv_size()));
     z3::expr guard(v2 == zero);
     z3::expr ans(ctxt, Z3_mk_bvsrem(ctxt, v1, v2));
     return z3::expr(ctxt, Z3_mk_ite(ctxt, guard, zero, ans));
 }
Exemple #4
0
z3::expr
ModelValidator::genFPConst(z3::expr expr, SymbolKind kind, unsigned id,
                           const std::vector<double>& model) const noexcept
{
    if (kind == SymbolKind::kFP32Var) {
        auto var_ast =
                Z3_mk_fpa_numeral_float(expr.ctx(),
                                        static_cast<float>(model[id]),
                                        Z3_mk_fpa_sort_32(expr.ctx()));
        return z3::to_expr(expr.ctx(), var_ast);
    } else {
        assert(kind == SymbolKind::kFP64Var && "Bad variable kind!");
        //TODO: handle FP16 and FP128 constants
        auto var_ast =
                Z3_mk_fpa_numeral_double(expr.ctx(), model[id],
                                         Z3_mk_fpa_sort_64(expr.ctx()));
        return z3::to_expr(expr.ctx(), var_ast);
    }
}
Exemple #5
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static z3::expr insert(z3::expr set, unsigned element) {
  z3::context& context = set.ctx();
  return z3::store(set, context.int_val(element), context.bool_val(true));
}
 z3::expr operator()(const z3::expr& v1, const z3::expr& v2)
 {
     return z3::expr(v1.ctx(), Z3_mk_bvule(v1.ctx(), v1, v2));
 }