C++ operandst::size方法代码示例

exprt functionst::arguments_equal(const exprt::operandst &o1,
                                  const exprt::operandst &o2)
{
  assert(o1.size()==o2.size());

  if(o1.empty())
    return true_exprt();

  and_exprt and_expr;
  and_exprt::operandst &conjuncts=and_expr.operands();
  conjuncts.resize(o1.size());

  for(std::size_t i=0; i<o1.size(); i++)
  {
    exprt lhs=o1[i];
    exprt rhs=o2[i];

    if(lhs.type()!=rhs.type())
      rhs.make_typecast(lhs.type());

    conjuncts[i]=equal_exprt(lhs, rhs);
  }

  return and_expr;
}

exprt conjunction(const exprt::operandst &op)
{
  if(op.empty())
    return true_exprt();
  else if(op.size()==1)
    return op.front();
  else
  {
    and_exprt result;
    result.operands()=op;
    return result;
  }
}

exprt disjunction(const exprt::operandst &op)
{
  if(op.empty())
    return false_exprt();
  else if(op.size()==1)
    return op.front();
  else
  {
    or_exprt result;
    result.operands()=op;
    return result;
  }
}

void goto_convertt::do_array_copy(
  const exprt &lhs,
  const exprt &function,
  const exprt::operandst &arguments,
  goto_programt &dest)
{
  if(arguments.size()!=2)
  {
    err_location(function);
    throw "array_copy expects two arguments";
  }

  codet array_set_statement;
  array_set_statement.set_statement(ID_array_copy);
  array_set_statement.operands()=arguments;

  copy(array_set_statement, OTHER, dest);
}

void goto_convertt::do_output(
  const exprt &lhs,
  const exprt &function,
  const exprt::operandst &arguments,
  goto_programt &dest)
{
  codet output_code;
  output_code.set_statement(ID_output);
  output_code.operands()=arguments;
  output_code.add_source_location()=function.source_location();
  
  if(arguments.size()<2)
  {
    err_location(function);
    throw "output takes at least two arguments";
  }
    
  copy(output_code, OTHER, dest);
}

void goto_convertt::do_array_equal(
  const exprt &lhs,
  const exprt &function,
  const exprt::operandst &arguments,
  goto_programt &dest)
{
  if(arguments.size()!=2)
  {
    err_location(function);
    throw "array_equal expects two arguments";
  }
  
  const typet &arg0_type=ns.follow(arguments[0].type());
  const typet &arg1_type=ns.follow(arguments[1].type());
  
  if(arg0_type.id()!=ID_pointer ||
     arg1_type.id()!=ID_pointer)
  {
    err_location(function);
    throw "array_equal expects pointer arguments";
  }
  
  if(lhs.is_not_nil())
  {
    code_assignt assignment;
    
    // add dereferencing here
    dereference_exprt lhs_array, rhs_array;
    lhs_array.op0()=arguments[0];
    rhs_array.op0()=arguments[1];
    lhs_array.type()=arg0_type.subtype();
    rhs_array.type()=arg1_type.subtype();
    
    assignment.lhs()=lhs;
    assignment.rhs()=binary_exprt(
      lhs_array, ID_array_equal, rhs_array, lhs.type());
    
    convert(assignment, dest);
  }
}

void boolbvt::convert_update_rec(
  const exprt::operandst &designators,
  std::size_t d,
  const typet &type,
  std::size_t offset,
  const exprt &new_value,
  bvt &bv)
{
  if(type.id()==ID_symbol)
    convert_update_rec(
      designators, d, ns.follow(type), offset, new_value, bv);

  if(d>=designators.size())
  {
    // done
    bvt new_value_bv=convert_bv(new_value);
    std::size_t new_value_width=boolbv_width(type);
    
    if(new_value_width!=new_value_bv.size())
      throw "convert_update_rec: unexpected new_value size";

    // update
    for(std::size_t i=0; i<new_value_width; i++)
    {
      assert(offset+i<bv.size());
      bv[offset+i]=new_value_bv[i];
    }
    
    return;
  }

  const exprt &designator=designators[d];

  if(designator.id()==ID_index_designator)
  {
    if(type.id()!=ID_array)
      throw "update: index designator needs array";
      
    if(designator.operands().size()!=1)
      throw "update: index designator takes one operand";
      
    bvt index_bv=convert_bv(designator.op0());

    const array_typet &array_type=to_array_type(type);
    
    const typet &subtype=ns.follow(array_type.subtype());

    std::size_t element_size=boolbv_width(subtype);

    // iterate over array
    mp_integer size;
    if(to_integer(array_type.size(), size))
      throw "update: failed to get array size";
      
    bvt tmp_bv=bv;
    
    for(std::size_t i=0; i!=integer2long(size); ++i)
    {
      std::size_t new_offset=offset+i*element_size;
      
      convert_update_rec(
        designators, d+1, subtype, new_offset, new_value, tmp_bv);

      bvt const_bv=bv_utils.build_constant(i, index_bv.size());
      literalt equal=bv_utils.equal(const_bv, index_bv);

      for(std::size_t j=0; j<element_size; j++)
      {
        std::size_t idx=new_offset+j;
        assert(idx<bv.size());
        bv[idx]=prop.lselect(equal, tmp_bv[idx], bv[idx]);
      }
    }
  }
  else if(designator.id()==ID_member_designator)
  {
    const irep_idt &component_name=designator.get(ID_component_name);
  
    if(type.id()==ID_struct)
    {
      const struct_typet &struct_type=
        to_struct_type(type);

      std::size_t struct_offset=0;
      
      struct_typet::componentt component;
      component.make_nil();

      const struct_typet::componentst &components=
        struct_type.components();

      for(struct_typet::componentst::const_iterator
          it=components.begin();
          it!=components.end();
          it++)
      {
        const typet &subtype=it->type();
        std::size_t sub_width=boolbv_width(subtype);

        if(it->get_name()==component_name)
//.........这里部分代码省略.........

void goto_convertt::do_prob_uniform(
  const exprt &lhs,
  const exprt &function,
  const exprt::operandst &arguments,
  goto_programt &dest)
{
  const irep_idt &identifier=function.get(ID_identifier);

  // make it a side effect if there is an LHS
  if(arguments.size()!=2)
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected to have two arguments";
  }

  if(lhs.is_nil())
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected to have LHS";
  }

  exprt rhs=side_effect_exprt("prob_uniform", lhs.type());
  rhs.add_source_location()=function.source_location();

  if(lhs.type().id()!=ID_unsignedbv &&
     lhs.type().id()!=ID_signedbv)
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected other type";
  }

  if(arguments[0].type().id()!=lhs.type().id() ||
     arguments[1].type().id()!=lhs.type().id())
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected operands to be of same type as LHS";
  }

  if(!arguments[0].is_constant() ||
     !arguments[1].is_constant())
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected operands to be constant literals";
  }

  mp_integer lb, ub;

  if(to_integer(arguments[0], lb) ||
     to_integer(arguments[1], ub))
  {
    err_location(function);
    throw "error converting operands";
  }

  if(lb > ub)
  {
    err_location(function);
    throw "expected lower bound to be smaller or equal to the upper bound";
  }

  rhs.copy_to_operands(arguments[0], arguments[1]);

  code_assignt assignment(lhs, rhs);
  assignment.add_source_location()=function.source_location();
  copy(assignment, ASSIGN, dest);
}

void goto_convertt::do_scanf(
  const exprt &lhs,
  const exprt &function,
  const exprt::operandst &arguments,
  goto_programt &dest)
{
  const irep_idt &f_id=function.get(ID_identifier);

  if(f_id==CPROVER_PREFIX "scanf")
  {
    if(arguments.size()<1)
    {
      err_location(function);
      error() << "scanf takes at least one argument" << eom;
      throw 0;
    }
    
    irep_idt format_string;
    
    if(!get_string_constant(arguments[0], format_string))
    {
      // use our model
      format_token_listt token_list=parse_format_string(id2string(format_string));
        
      std::size_t argument_number=1;
      
      for(const auto & t : token_list)
      {
        typet type=get_type(t);
      
        if(type.is_not_nil())
        {
          if(argument_number<arguments.size())
          {
            exprt ptr=
              typecast_exprt(arguments[argument_number], pointer_type(type));
            argument_number++;

            // make it nondet for now
            exprt lhs=dereference_exprt(ptr, type);
            exprt rhs=side_effect_expr_nondett(type);
            code_assignt assign(lhs, rhs);
            assign.add_source_location()=function.source_location();
            copy(assign, ASSIGN, dest);
          }
        }
      }
    }
    else
    {
      // we'll just do nothing
      code_function_callt function_call;
      function_call.lhs()=lhs;
      function_call.function()=function;
      function_call.arguments()=arguments;
      function_call.add_source_location()=function.source_location();

      copy(function_call, FUNCTION_CALL, dest);
    }
  }
  else
    assert(false);
}

void goto_convertt::do_prob_coin(
  const exprt &lhs,
  const exprt &function,
  const exprt::operandst &arguments,
  goto_programt &dest)
{
  const irep_idt &identifier=function.get(ID_identifier);

  // make it a side effect if there is an LHS
  if(arguments.size()!=2) 
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected to have two arguments";
  }
  
  if(lhs.is_nil())
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected to have LHS";
  }

  exprt rhs=side_effect_exprt("prob_coin", lhs.type());
  rhs.add_source_location()=function.source_location();

  if(lhs.type()!=bool_typet())
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected bool";
  }

  if(arguments[0].type().id()!=ID_unsignedbv ||
     arguments[0].id()!=ID_constant)
  {
    err_location(function);
    throw "`"+id2string(identifier)+"' expected first "
          "operand to be a constant literal of type unsigned long";
  }

  mp_integer num, den;

  if(to_integer(arguments[0], num) ||
     to_integer(arguments[1], den))
  {
    err_location(function);
    throw "error converting operands";
  }

  if(num-den > mp_integer(0))
  {
    err_location(function);
    throw "probability has to be smaller than 1";
  }

  if(den == mp_integer(0))
  {
    err_location(function);
    throw "denominator may not be zero";
  }

  rationalt numerator(num), denominator(den);
  rationalt prob = numerator / denominator;

  rhs.copy_to_operands(from_rational(prob));

  code_assignt assignment(lhs, rhs);
  assignment.add_source_location()=function.source_location();
  copy(assignment, ASSIGN, dest);
}

void goto_convertt::do_function_call_symbol(
  const exprt &lhs,
  const symbol_exprt &function,
  const exprt::operandst &arguments,
  goto_programt &dest)
{
  if(function.get_bool("#invalid_object"))
    return; // ignore

  // lookup symbol
  const irep_idt &identifier=function.get_identifier();

  const symbolt *symbol;
  if(ns.lookup(identifier, symbol))
  {
    err_location(function);
    throw "error: function `"+id2string(identifier)+"' not found";
  }

  if(symbol->type.id()!=ID_code)
  {
    err_location(function);
    throw "error: function `"+id2string(identifier)+"' type mismatch: expected code";
  }
  
  if(identifier==CPROVER_PREFIX "assume" ||
     identifier=="__VERIFIER_assume")
  {
    if(arguments.size()!=1)
    {
      err_location(function);
      throw "`"+id2string(identifier)+"' expected to have one argument";
    }

    goto_programt::targett t=dest.add_instruction(ASSUME);
    t->guard=arguments.front();
    t->source_location=function.source_location();
    t->source_location.set("user-provided", true);
    
    // let's double-check the type of the argument
    if(t->guard.type().id()!=ID_bool)
      t->guard.make_typecast(bool_typet());

    if(lhs.is_not_nil())
    {
      err_location(function);
      throw id2string(identifier)+" expected not to have LHS";
    }
  }
  else if(identifier=="__VERIFIER_error")
  {
    if(!arguments.empty())
    {
      err_location(function);
      throw "`"+id2string(identifier)+"' expected to have no arguments";
    }

    goto_programt::targett t=dest.add_instruction(ASSERT);
    t->guard=false_exprt();
    t->source_location=function.source_location();
    t->source_location.set("user-provided", true);
    t->source_location.set_property_class(ID_assertion);

    if(lhs.is_not_nil())
    {
      err_location(function);
      throw id2string(identifier)+" expected not to have LHS";
    }
  }
  else if(has_prefix(id2string(identifier), "java::java.lang.AssertionError.<init>:"))
  {
    // insert function call anyway
    code_function_callt function_call;
    function_call.lhs()=lhs;
    function_call.function()=function;
    function_call.arguments()=arguments;
    function_call.add_source_location()=function.source_location();

    copy(function_call, FUNCTION_CALL, dest);

    if(arguments.size()!=1 && arguments.size()!=2)
    {
      err_location(function);
      throw "`"+id2string(identifier)+"' expected to have one or two arguments";
    }

    goto_programt::targett t=dest.add_instruction(ASSERT);
    t->guard=false_exprt();
    t->source_location=function.source_location();
    t->source_location.set("user-provided", true);
    t->source_location.set_property_class(ID_assertion);    
    t->source_location.set_comment("assertion at "+function.source_location().as_string());
  }
  else if(identifier=="assert" &&
          !ns.lookup(identifier).location.get_function().empty())
  {
    if(arguments.size()!=1)
    {
      err_location(function);
      throw "`"+id2string(identifier)+"' expected to have one argument";
//.........这里部分代码省略.........

codet cpp_typecheckt::cpp_constructor(
  const source_locationt &source_location,
  const exprt &object,
  const exprt::operandst &operands)
{
  exprt object_tc=object;

  typecheck_expr(object_tc);

  elaborate_class_template(object_tc.type());

  typet tmp_type(object_tc.type());
  follow_symbol(tmp_type);

  assert(!is_reference(tmp_type));

  if(tmp_type.id()==ID_array)
  {
    // We allow only one operand and it must be tagged with '#array_ini'.
    // Note that the operand is an array that is used for copy-initialization.
    // In the general case, a program is not allow to use this form of
    // construct. This way of initializing an array is used internaly only.
    // The purpose of the tag #arra_ini is to rule out ill-formed
    // programs.

    if(!operands.empty() && !operands.front().get_bool("#array_ini"))
    {
      error().source_location=source_location;
      error() << "bad array initializer" << eom;
      throw 0;
    }

    assert(operands.empty() || operands.size()==1);

    if(operands.empty() && cpp_is_pod(tmp_type))
    {
      codet nil;
      nil.make_nil();
      return nil;
    }

    const exprt &size_expr=
      to_array_type(tmp_type).size();

    if(size_expr.id()=="infinity")
    {
      // don't initialize
      codet nil;
      nil.make_nil();
      return nil;
    }

    exprt tmp_size=size_expr;
    make_constant_index(tmp_size);

    mp_integer s;
    if(to_integer(tmp_size, s))
    {
      error().source_location=source_location;
      error() << "array size `" << to_string(size_expr)
              << "' is not a constant" << eom;
      throw 0;
    }

    /*if(cpp_is_pod(tmp_type))
    {
      code_expressiont new_code;
      exprt op_tc=operands.front();
      typecheck_expr(op_tc);
       // Override constantness
      object_tc.type().set("#constant", false);
      object_tc.set("#lvalue", true);
      side_effect_exprt assign("assign");
      assign.add_source_location()=source_location;
      assign.copy_to_operands(object_tc, op_tc);
      typecheck_side_effect_assignment(assign);
      new_code.expression()=assign;
      return new_code;
    }
    else*/
    {
      codet new_code(ID_block);

      // for each element of the array, call the default constructor
      for(mp_integer i=0; i < s; ++i)
      {
        exprt::operandst tmp_operands;

        exprt constant=from_integer(i, index_type());
        constant.add_source_location()=source_location;

        exprt index(ID_index);
        index.copy_to_operands(object);
        index.copy_to_operands(constant);
        index.add_source_location()=source_location;

        if(!operands.empty())
        {
          exprt operand(ID_index);
          operand.copy_to_operands(operands.front());
//.........这里部分代码省略.........