goto_programt::targett add_inv_prog(invariant_programt &prog,
goto_programt::targett pos, const size_t max_solution_size,
const goto_programt::targett &decl)
{
symbol_tablet &st=prog.st;
goto_functionst &gf=prog.gf;
const std::string base_name(get_prog_var_name(st, decl));
const typet size_type(unsigned_int_type());
const constant_exprt size(from_integer(max_solution_size, size_type));
const symbol_typet instr_type(CEGIS_INSTRUCTION_TYPE_NAME);
const array_typet prog_type(instr_type, size);
pos=declare_cegis_meta_variable(st, gf, pos, base_name, prog_type);
execute_inv_prog(st, gf, max_solution_size, decl);
return pos;
}
size_t default_cegis_constant_strategy(symbol_tablet &st, goto_functionst &gf)
{
const std::vector<constant_exprt> literals(collect_integer_literals(st, gf));
size_t max_word_width=0u;
size_t const_index=0u;
goto_programt::targett pos=get_entry_body(gf).instructions.begin();
// XXX: Literals strategy, benchmark performance
for (const constant_exprt &expr : literals)
{
// XXX: Debug
//std::cout << "<id>" << const_index << "</id>" << std::endl;
//std::cout << "<value>" << expr.to_string() << "</value>" << std::endl;
// XXX: Debug
const std::string base_name(get_name(const_index++));
pos=declare_cegis_meta_variable(st, gf, pos, base_name, expr.type());
pos=assign_cegis_meta_variable(st, gf, pos, base_name, expr);
max_word_width=std::max(max_word_width, get_min_word_width(expr));
}
return max_word_width;
}