path: root/TAO/TAO_IDL/ast/ast_module.cpp

// $Id$

/*

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This product is protected by copyright and distributed under the following
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*/

// Implementation of class AST_Module

// AST_Modules denote IDL module declarations
// AST_Modules are subclasses of AST_Decl (they are not a type!) and
// of UTL_Scope.

#include "idl.h"
#include "idl_extern.h"

ACE_RCSID(ast, ast_module, "$Id$")

// Constructor(s) and destructor.

AST_Module::AST_Module ()
{
}

AST_Module::AST_Module (UTL_ScopedName *n)
 : AST_Decl (AST_Decl::NT_module,
             n),
   UTL_Scope (AST_Decl::NT_module),
   pd_has_nested_valuetype (0)
{
}

AST_Module::~AST_Module (void)
{
}

// Add this AST_PredefinedType node (a predefined type declaration) to
// this scope.

AST_PredefinedType *
AST_Module::fe_add_predefined_type (AST_PredefinedType *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced (d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor (d))
        {
          idl_global->err()->redefinition_in_scope (t,
                                                    d);
          return 0;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Add this AST_Module node (a module declaration) to this scope.
AST_Module *
AST_Module::fe_add_module (AST_Module *t)
{
  AST_Decl *d;
  AST_Module *m = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }
        // If our platform supports namespaces, we allow reopening
        // modules. However, if namespace support is not available, this is
        // flagged as an error.

#ifndef ACE_HAS_USING_KEYWORD
      if (this->referenced (d, t->local_name ())
          && !d->imported ()
          && !ACE_BIT_ENABLED (idl_global->compile_flags (),
                               IDL_CF_NOWARNINGS))
        {
          UTL_String *s = t->file_name ();
          long lineno = t->line ();

          ACE_ERROR_RETURN ((
              LM_ERROR,
              ACE_TEXT ("%s:warning: %s:%d: %s%s"),
              ACE_TEXT (idl_global->prog_name ()),
              ACE_TEXT ((idl_global->read_from_stdin ()
                           ? "standard input"
                           : s->get_string ())),
              lineno,
              ACE_TEXT ("Reopening module but platform does not support\n"),
              ACE_TEXT (" namespaces, generated code may not compile\n")
            ),
            0
          );
        }
#endif /* ACE_HAS_USING_KEYWORD */

      m = AST_Module::narrow_from_decl (d);

      // has_ancestor() returns TRUE if both nodes are the same.
      if (t != m)
        {
          if (t->has_ancestor (d))
            {
              idl_global->err ()->redefinition_in_scope (t,
                                                         d);
              return 0;
            }
        }
    }

  // If this node is not a reopened module, add it to scope and referenced.
  if (m == 0 || t != m)
    {
      // Add it to scope.
      this->add_to_scope (t);

      // Add it to set of locally referenced symbols.
      this->add_to_referenced (t,
                               I_FALSE,
                               t->local_name ());
    }

  return t;
}

// Add this AST_Interface node (an interface declaration) to this scope.
AST_Interface *
AST_Module::fe_add_interface (AST_Interface *t)
{
  AST_Decl *predef = 0;
  AST_Interface *fwd = 0;

  // Already defined?
  if ((predef = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      // Treat fwd declared interfaces specially
      if (predef->node_type () == AST_Decl::NT_interface)
        {
          fwd = AST_Interface::narrow_from_decl (predef);

          if (fwd == 0)
            {
              return 0;
            }

          // Forward declared and not defined yet.
          if (!fwd->is_defined ())
            {
              if (fwd->defined_in () != this)
                {
                  idl_global->err ()->error3 (UTL_Error::EIDL_SCOPE_CONFLICT,
                                              fwd,
                                              t,
                                              this);

                  return 0;
                }
            }
          // OK, not illegal redef of forward declaration. Now check whether.
          // it has been referenced already.
          else if (this->referenced (predef, t->local_name ()))
            {
              idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                          t,
                                          this,
                                          predef);

              return 0;
            }
        }
      else if (!can_be_redefined (predef))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      predef);

          return 0;
        }
      else if (referenced (predef, t->local_name ()) && !t->is_defined ())
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      predef);

          return 0;
        }
      else if (t->has_ancestor (predef))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     predef);

          return 0;
        }
    }

  // Add it to scope
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());
  return t;
}

// Add this AST_InterfaceFwd node (a forward declaration of an IDL
// interface) to this scope.
AST_InterfaceFwd *
AST_Module::fe_add_interface_fwd (AST_InterfaceFwd *i)
{
  AST_Decl *d = 0;
  AST_Interface *itf = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (i, I_FALSE)) != 0)
    {
      // There used to be another check here ANDed with the one below:
      // d->defined_in () == this. But lookup_for_add calls only
      // lookup_by_name_local(), which does not bump up the scope,
      // and look_in_previous() for modules. If look_in_previous()
      // finds something, the scopes will NOT be the same pointer
      // value, but the result is what we want.
      if (d->node_type  () == AST_Decl::NT_interface)
        {
          itf = AST_Interface::narrow_from_decl (d);

          if (itf == 0)
            {
              return 0;
            }

          if (i->added () == 0)
            {
              i->set_added (1);
              this->add_to_scope (i);
            }

          // @@ Redefinition of forward. Type check not implemented.
          i->set_full_definition (itf);   // @@ Memory leak.
          return i;
        }

      if (!can_be_redefined (d)) {

          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      i,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced (d, i->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      i,
                                      this,
                                      d);
          return 0;
        }

      if (i->has_ancestor (d))
        {
          idl_global->err ()->redefinition_in_scope  (i,
                                                      d);
          return 0;
        }
    }

  // Add it to scope
  this->add_to_scope (i);

  // Add it to set of locally referenced symbols
  this->add_to_referenced (i,
                           I_FALSE,
                           i->local_name ());

  return i;
}

// Add this AST_Constant node (a constant declaration) to this scope.
AST_Constant *
AST_Module::fe_add_constant (AST_Constant *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                       t,
                                       this,
                                       d);
          return 0;
        }

      if (this->referenced (d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor (d))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     d);
          return NULL;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Add this AST_Exception node (an exception declaration) to this scope
AST_Exception *
AST_Module::fe_add_exception (AST_Exception *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced  (d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor (d))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     d);
          return 0;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Add this AST_Union node (a union declaration) to this scope
AST_Union *
AST_Module::fe_add_union (AST_Union *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced (d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor (d))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     d);
          return 0;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Add this AST_Structure node (a struct declaration) to this scope.
AST_Structure *
AST_Module::fe_add_structure (AST_Structure *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced(d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor(d))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     d);
          return 0;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Add this AST_Enum node (an enum declaration) to this scope.
AST_Enum *
AST_Module::fe_add_enum (AST_Enum *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced (d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor(d))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     d);
          return 0;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Add this AST_EnumVal node (an enumerator declaration) to this scope
// This is done to conform to the C++ scoping rules which declare
// enumerators in the enclosing scope (in addition to declaring them
// in the enum itself).
AST_EnumVal *
AST_Module::fe_add_enum_val (AST_EnumVal *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add(t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced (d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor (d))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     d);
          return 0;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Add this AST_Typedef node (a typedef) to this scope.
AST_Typedef *
AST_Module::fe_add_typedef (AST_Typedef *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add(t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced (d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor (d))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     d);
          return 0;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Add an AST_Native (a native declaration) to this scope.
AST_Native *
AST_Module::fe_add_native (AST_Native *t)
{
  AST_Decl *d = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = this->lookup_for_add (t, I_FALSE)) != 0)
    {
      if (!can_be_redefined (d))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_REDEF,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (this->referenced (d, t->local_name ()))
        {
          idl_global->err ()->error3 (UTL_Error::EIDL_DEF_USE,
                                      t,
                                      this,
                                      d);
          return 0;
        }

      if (t->has_ancestor (d))
        {
          idl_global->err ()->redefinition_in_scope (t,
                                                     d);
          return 0;
        }
    }

  // Add it to scope.
  this->add_to_scope (t);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (t,
                           I_FALSE,
                           t->local_name ());

  return t;
}

// Dump this AST_Module node to the ostream o.
void
AST_Module::dump (ACE_OSTREAM_TYPE &o)
{
  o << "module ";
  this->local_name ()->dump (o);
  o << " {\n";
  UTL_Scope::dump (o);
  idl_global->indent ()->skip_to (o);
  o << "}";
}


// Involved in OBV_ namespace generation.
void
AST_Module::set_has_nested_valuetype (void)
{
  UTL_Scope *parent = this->defined_in ();

  if (!this->pd_has_nested_valuetype && parent)
    {
      AST_Module *pm = AST_Module::narrow_from_scope (parent);

      if (pm != 0)
        {
          pm->set_has_nested_valuetype ();
        }
    }

  this->pd_has_nested_valuetype = 1;
}

idl_bool
AST_Module::has_nested_valuetype (void)
{
  return this->pd_has_nested_valuetype;
}

int
AST_Module::be_add_interface (AST_Interface *i,
                              AST_Interface *ix)
{
  // Add it to scope.
  this->add_to_scope (i,
                      ix);

  // Add it to set of locally referenced symbols.
  this->add_to_referenced (i,
                           I_FALSE,
                           i->local_name (),
                           ix);

  return 0;
}

void
AST_Module::add_CORBA_members (void)
{
  UTL_ScopedName *sn = 0;
  Identifier *id = 0;

  ACE_NEW (id,
           Identifier ("TypeCode"));

  ACE_NEW (sn,
           UTL_ScopedName (id,
                           0));

  AST_PredefinedType *pdt =
    idl_global->gen ()->create_predefined_type (
                            AST_PredefinedType::PT_pseudo,
                            sn
                          );

  this->fe_add_predefined_type (pdt);
}

void
AST_Module::add_to_previous (AST_Module *m)
{
  // Here, we depend on the scope iterator in
  // be_generator::create_module (which calls this function)
  // to return items in the order they were declared or included.
  // That means that the last module returned that matches the name
  // of this one will have all the decls from all previous
  // reopenings in its previous_ member.
  this->previous_ = m->previous_;

  AST_Decl *d = 0;

  for (UTL_ScopeActiveIterator iter (DeclAsScope (m), IK_decls);
       !iter.is_done ();
       iter.next ())
    {
      d = iter.item ();

      // Add all the previous opening's decls (except
      // for the predefined types) to the 'previous' list
      // of this one.
      if (d->node_type () == AST_Decl::NT_pre_defined)
        {
          continue;
        }
      else if (d->node_type () == AST_Decl::NT_interface_fwd)
        {
          AST_InterfaceFwd *f = AST_InterfaceFwd::narrow_from_decl (d);
          AST_Interface *i = f->full_definition ();

          // If i is defined, it means that the interface was forward
          // declared AFTER it was defined, perhaps in a subsequent
          // opening of the same module - legal, but superfluous.
          // Adding d to previous_ in that case can only bung up the
          // results of look_in_previous() later, so we skip it.
          if (i->is_defined ())
            {
              continue;
            }
        }

      this->previous_.insert (d);
    }
}

AST_Decl *
AST_Module::look_in_previous (Identifier *e)
{
  AST_Decl *d = 0;
  AST_Decl *retval = 0;
  ACE_Unbounded_Set_Iterator<AST_Decl *> iter (this->previous_);

  // If there are more than two openings of this module, we want
  // to get the last one - the one that will have the decls from
  // all the previous openings added to previous_.
  while (!iter.done ())
    {
      d = *iter;

      if (e->case_compare (d->local_name ()))
        {
          retval = d;
        }

      iter++;
    }

  return retval;
}

void
AST_Module::destroy (void)
{
}

int
AST_Module::ast_accept (ast_visitor *visitor)
{
  return visitor->visit_module (this);
}

// Narrowing methods
IMPL_NARROW_METHODS2(AST_Module, AST_Decl, UTL_Scope)
IMPL_NARROW_FROM_DECL(AST_Module)
IMPL_NARROW_FROM_SCOPE(AST_Module)