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 */


/*
 * ast_operation.cc - Implementation of class AST_Operation
 *
 * AST_Operation nodes denote IDL operation declarations
 * AST_Operations are a subclass of AST_Decl (they are not a type!)
 * and of UTL_Scope (the arguments are managed in a scope).
 * AST_Operations have a return type (a subclass of AST_Type),
 * a bitfield for denoting various properties of the operation (the
 * values are ORed together from constants defined in the enum
 * AST_Operation::FLags), a name (a UTL_ScopedName), a context
 * (implemented as a list of Strings, a UTL_StrList), and a raises
 * clause (implemented as an array of AST_Exceptions).
 */

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

/*
 * Constructor(s) and destructor
 */
AST_Operation::AST_Operation ()
:
   pd_return_type (NULL),
   pd_flags (OP_noflags),
   pd_context (NULL),
   pd_exceptions (NULL)
{}

AST_Operation::AST_Operation
(
   AST_Type *rt,
   Flags fl,
   UTL_ScopedName *n,
   const UTL_Pragmas &p
)
:
   AST_Decl (AST_Decl::NT_op, n, p),
   UTL_Scope (AST_Decl::NT_op, n, p),
   pd_return_type (rt),
   pd_flags (fl),
   pd_context (NULL),
   pd_exceptions (NULL)
{
   AST_PredefinedType *pdt;

   /*
   * Check that if the operation is oneway, the return type must be void
   */

   if (rt != NULL && pd_flags == OP_oneway)
   {
      if (rt->node_type() != AST_Decl::NT_pre_defined)
         idl_global->err()->error1(UTL_Error::EIDL_NONVOID_ONEWAY, this);
      else
      {
         pdt = AST_PredefinedType::narrow_from_decl(rt);

         if (pdt == NULL || pdt->pt() != AST_PredefinedType::PT_void)
            idl_global->err()->error1(UTL_Error::EIDL_NONVOID_ONEWAY, this);
      }
   }
}

/*
 * Add this context (a UTL_StrList) to this scope
 */
UTL_StrList * AST_Operation::fe_add_context(UTL_StrList *t)
{
   pd_context = t;
   return t;
}

/*
 * Add these exceptions (identified by name) to this scope.
 * This looks up each name to resolve it to the name of a known
 * exception, and then adds the referenced exception to the list
 * of exceptions that this operation can raise.
 *
 * NOTE: No attempt is made to ensure that exceptions are mentioned
 *       only once..
 */
UTL_NameList * AST_Operation::fe_add_exceptions(UTL_NameList *t)
{
   UTL_NamelistActiveIterator *nl_i;
   UTL_ScopedName *nl_n;
   AST_Exception *fe;
   AST_Decl *d;

   idl_global->scopes()->top();
   pd_exceptions = NULL;
   nl_i = new UTL_NamelistActiveIterator(t);

   while (!(nl_i->is_done()))
   {
      nl_n = nl_i->item();
      d = lookup_by_name(nl_n, true);

      if (d == NULL || d->node_type() != AST_Decl::NT_except)
      {
         idl_global->err()->lookup_error(nl_n);
         delete nl_i;
         return NULL;
      }

      fe = AST_Exception::narrow_from_decl(d);

      if (fe == NULL)
      {
         idl_global->err()->error1(UTL_Error::EIDL_ILLEGAL_RAISES, this);
         return NULL;
      }

      if (pd_exceptions == NULL)
         pd_exceptions = new UTL_ExceptList(fe, NULL);
      else
         pd_exceptions->nconc(new UTL_ExceptList(fe, NULL));

      nl_i->next();
   }

   delete nl_i;

   return t;
}

/*
 * Add this AST_Argument node (an operation argument declaration)
 * to this scope
 */
AST_Argument *AST_Operation::fe_add_argument(AST_Argument *t)
{
   AST_Decl *d;

   /*
    * Already defined and cannot be redefined? Or already used?
    */

   if ((d = lookup_by_name_local (t->local_name())) != NULL)
   {
      if (!can_be_redefined(d))
      {
         idl_global->err()->error3(UTL_Error::EIDL_REDEF, t, this, d);
         return NULL;
      }

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

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

   /*
    * Cannot add OUT or INOUT argument to oneway operation
    */
   if ((t->direction() == AST_Argument::dir_OUT ||
      t->direction() == AST_Argument::dir_INOUT) &&
      pd_flags == OP_oneway)
   {
      idl_global->err()->error2(UTL_Error::EIDL_ONEWAY_CONFLICT, t, this);
      return NULL;
   }

   /*
    * Add it to scope
    */
   add_to_scope(t);

   /*
    * Add it to set of locally referenced symbols
    */
   add_to_referenced(t, false);

   return t;
}

/*
 * Dump this AST_Operation node (an operation) to the ostream o
 */
void AST_Operation::dump(ostream &o)
{
   UTL_ScopeActiveIterator *i;
   UTL_StrlistActiveIterator *si;
   UTL_ExceptlistActiveIterator *ei;
   AST_Decl *d;
   AST_Exception *e;
   UTL_String *s;

   if (pd_flags == OP_oneway)
      o << "oneway ";
   else if (pd_flags == OP_idempotent)
      o << "idempotent ";

   i = new UTL_ScopeActiveIterator(this, IK_decls);

   pd_return_type->name()->dump(o);

   o << " ";

   local_name()->dump(o);

   o << "(";

   while (!(i->is_done()))
   {
      d = i->item();
      d->dump(o);
      i->next();

      if (!(i->is_done()))
         o << ", ";
   }

   delete i;
   o << ")";

   if (pd_exceptions != NULL)
   {
      o << " raises(";
      ei = new UTL_ExceptlistActiveIterator(pd_exceptions);

      while (!(ei->is_done()))
      {
         e = ei->item();
         ei->next();
         e->local_name()->dump(o);

         if (!(ei->is_done()))
            o << ", ";
      }

      delete ei;
      o << ")";
   }

   if (pd_context != NULL)
   {
      o << " context(";
      si = new UTL_StrlistActiveIterator(pd_context);

      while (!(si->is_done()))
      {
         s = si->item();
         si->next();
         o << s->get_string();

         if (!(si->is_done()))
            o << ", ";
      }

      delete si;
      o << ")";
   }
}

/*
 * Data accessors
 */

AST_Type * AST_Operation::return_type()
{
   return pd_return_type;
}

AST_Operation::Flags AST_Operation::flags()
{
   return pd_flags;
}

UTL_StrList * AST_Operation::context()
{
   return pd_context;
}

UTL_ExceptList * AST_Operation::exceptions()
{
   return pd_exceptions;
}

// Narrowing

IMPL_NARROW_METHODS2 (AST_Operation, AST_Decl, UTL_Scope)
IMPL_NARROW_FROM_DECL (AST_Operation)
IMPL_NARROW_FROM_SCOPE (AST_Operation)
