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;
}
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));
}
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);
}
}
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));
}
