anonymous_member.cpp

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/*******************************************************************\
 
Module: ANSI-C Language Type Checking
 
Author: Daniel Kroening, kroening@kroening.com
 
\*******************************************************************/

 
#include "anonymous_member.h"
 
#include <util/namespace.h>
#include <util/std_expr.h>
 
static member_exprt make_member_expr(
  const exprt &struct_union,
  const struct_union_typet::componentt &component,
  const namespacet &ns)
{
  member_exprt result(
    struct_union, component.get_name(), component.type());
 
  if(struct_union.get_bool(ID_C_lvalue))
    result.set(ID_C_lvalue, true);
 
  // todo: should to typedef chains properly
  const auto &tag_type = to_struct_or_union_tag_type(struct_union.type());
  if(
    ns.follow_tag(tag_type).get_bool(ID_C_constant) ||
    struct_union.type().get_bool(ID_C_constant))
  {
    result.type().set(ID_C_constant, true);
  }
 
  return result;
}
 
exprt get_component_rec(
  const exprt &struct_union,
  const irep_idt &component_name,
  const namespacet &ns)
{
  const auto &tag_type = to_struct_or_union_tag_type(struct_union.type());
 
  for(const auto &comp : ns.follow_tag(tag_type).components())
  {
    const typet &type = comp.type();
 
    if(comp.get_name()==component_name)
    {
      return std::move(make_member_expr(struct_union, comp, ns));
    }
    else if(
      comp.get_anonymous() &&
      (type.id() == ID_struct_tag || type.id() == ID_union_tag))
    {
      const member_exprt tmp = make_member_expr(struct_union, comp, ns);
      exprt result=get_component_rec(tmp, component_name, ns);
      if(result.is_not_nil())
        return result;
    }
  }
 
  return nil_exprt();
}
 
bool has_component_rec(
  const typet &type,
  const irep_idt &component_name,
  const namespacet &ns)
{
  const auto &tag_type = to_struct_or_union_tag_type(type);
 
  for(const auto &comp : ns.follow_tag(tag_type).components())
  {
    if(comp.get_name()==component_name)
    {
      return true;
    }
    else if(
      comp.get_anonymous() &&
      (comp.type().id() == ID_struct_tag || comp.type().id() == ID_union_tag))
    {
      if(has_component_rec(comp.type(), component_name, ns))
        return true;
    }
  }
 
  return false;
}