// ast_operation.cpp,v 1.35 2006/06/15 18:56:09 parsons Exp

/*

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*/

// 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 "ast_operation.h"
#include "ast_predefined_type.h"
#include "ast_argument.h"
#include "ast_exception.h"
#include "ast_visitor.h"
#include "utl_err.h"
#include "utl_namelist.h"
#include "utl_exceptlist.h"
#include "utl_identifier.h"
#include "utl_string.h"
#include "utl_strlist.h"
#include "global_extern.h"

ACE_RCSID (ast,
           ast_operation,
           "ast_operation.cpp,v 1.35 2006/06/15 18:56:09 parsons Exp")

AST_Operation::AST_Operation (void)
  : COMMON_Base (),
    AST_Decl(),
    UTL_Scope(),
    pd_return_type (0),
    pd_flags (OP_noflags),
    pd_context (0),
    pd_exceptions (0),
    argument_count_ (-1),
    has_native_ (0)
{
}

AST_Operation::AST_Operation (AST_Type *rt,
                              Flags fl,
                              UTL_ScopedName *n,
                              bool local,
                              bool abstract)
  : COMMON_Base (local,
                 abstract),
    AST_Decl(AST_Decl::NT_op,
             n),
    UTL_Scope(AST_Decl::NT_op),
    pd_return_type (rt),
    pd_flags (fl),
    pd_context (0),
    pd_exceptions (0),
    argument_count_ (-1),
    has_native_ (0)
{
  AST_PredefinedType *pdt = 0;

  // Check that if the operation is oneway, the return type must be void.
  if (rt != 0 && 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 == 0 || pdt->pt () != AST_PredefinedType::PT_void)
            {
              idl_global->err ()->error1 (UTL_Error::EIDL_NONVOID_ONEWAY,
                                          this);
            }
        }
    }
}

AST_Operation::~AST_Operation (void)
{
}

// Public operations.

int
AST_Operation::void_return_type (void)
{
  AST_Type* type = this->return_type ();

  if (type->node_type () == AST_Decl::NT_pre_defined
      && (AST_PredefinedType::narrow_from_decl (type)->pt ()
            == AST_PredefinedType::PT_void))
    {
      return 1;
    }
  else
    {
      return 0;
    }
}

// Return the member count.
int
AST_Operation::argument_count (void)
{
  this->compute_argument_attr ();

  return this->argument_count_;
}

int
AST_Operation::count_arguments_with_direction (int direction_mask)
{
  int count = 0;

  for (UTL_ScopeActiveIterator si (this, UTL_Scope::IK_decls);
       !si.is_done ();
       si.next ())
    {
      AST_Argument *arg =
        AST_Argument::narrow_from_decl (si.item ());

      if ((arg->direction () & direction_mask) != 0)
        {
          ++count;
        }
    }

  return count;
}


// Return if any argument or the return type is a <native> type.
int
AST_Operation::has_native (void)
{
  this->compute_argument_attr ();

  return this->has_native_;
}

void
AST_Operation::destroy (void)
{
  // No need to delete our exception list, the
  // destroy() method does it. The UTL_ExceptList
  // destroy() method does NOT delete the contained
  // exception nodes.

  if (this->pd_exceptions != 0)
    {
      this->pd_exceptions->destroy ();
      this->pd_exceptions = 0;
    }
  
  this->UTL_Scope::destroy ();
  this->AST_Decl::destroy ();
}

// Private operations.

// Compute total number of members.
int
AST_Operation::compute_argument_attr (void)
{
  if (this->argument_count_ != -1)
    {
      return 0;
    }

  AST_Decl *d = 0;
  AST_Type *type = 0;
  AST_Argument *arg = 0;

  this->argument_count_ = 0;

  // If there are elements in this scope.
  if (this->nmembers () > 0)
    {
      // Instantiate a scope iterator.
      for (UTL_ScopeActiveIterator si (this, UTL_Scope::IK_decls);
           !si.is_done ();
           si.next ())
        {
          // Get the next AST decl node.
          d = si.item ();

          if (d->node_type () == AST_Decl::NT_argument)
            {
              this->argument_count_++;

              arg = AST_Argument::narrow_from_decl (d);

              type = AST_Type::narrow_from_decl (arg->field_type ());

              if (type->node_type () == AST_Decl::NT_native)
                {
                  this->has_native_ = 1;
                }
            }
        }
    }

  type = AST_Type::narrow_from_decl (this->return_type ());

  if (type->node_type () == AST_Decl::NT_native)
    {
      this->has_native_ = 1;
    }

  return 0;
}

// Add this context (a UTL_StrList) to this scope.
UTL_StrList *
AST_Operation::fe_add_context (UTL_StrList *t)
{
  this->pd_context = t;

  return t;
}

UTL_ExceptList *
AST_Operation::be_add_exceptions (UTL_ExceptList *t)
{
  if (this->pd_exceptions != 0)
    {
      idl_global->err ()->error1 (UTL_Error::EIDL_ILLEGAL_RAISES,
                                  this);
    }
  else
    {
      this->pd_exceptions = t;
    }

  return this->pd_exceptions;
}

AST_Argument *
AST_Operation::be_add_argument (AST_Argument *arg)
{
  this->add_to_scope (arg);
  this->add_to_referenced (arg,
                           0,
                           0);
  return arg;
}

int
AST_Operation::be_insert_exception (AST_Exception *ex)
{
  UTL_ExceptList *new_list = 0;
  ACE_NEW_RETURN (new_list,
                  UTL_ExceptList (ex,
                                  this->pd_exceptions),
                  -1);
  this->pd_exceptions = new_list;
  return 0;
}

// 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
//  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)
{
  if (0 == t)
    {
      return 0;
    }
    
  UTL_ScopedName *nl_n = 0;
  AST_Exception *fe = 0;
  AST_Decl *d = 0;

  this->pd_exceptions = 0;

  for (UTL_NamelistActiveIterator nl_i (t); !nl_i.is_done (); nl_i.next ())
    {
      nl_n = nl_i.item ();
      d = this->lookup_by_name (nl_n, true);

      if (d == 0)
        {
          idl_global->err ()->lookup_error (nl_n);
          return 0;
        }

      bool oneway_op = (this->flags () == AST_Operation::OP_oneway);
      fe = AST_Exception::narrow_from_decl (d);

      if (oneway_op && fe != 0)
        {
          idl_global->err ()->error1 (UTL_Error::EIDL_ILLEGAL_RAISES,
                                      this);
        }

      if (fe == 0)
        {
          idl_global->err ()->error1 (UTL_Error::EIDL_ILLEGAL_RAISES,
                                      this);
          return 0;
        }

      if (this->pd_exceptions == 0)
        {
          ACE_NEW_RETURN (this->pd_exceptions,
                          UTL_ExceptList (fe,
                                          0),
                          0);
        }
      else
        {
          UTL_ExceptList *el = 0;
          ACE_NEW_RETURN (el,
                          UTL_ExceptList (fe,
                                          0),
                          0);

          this->pd_exceptions->nconc (el);
        }
    }

  // This return value is never used, it's easier to
  // destroy it here and return 0 than to destroy it
  // each place it is passed in.
  t->destroy ();
  delete t;
  t = 0;
  return 0;
}

// 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 = 0;

  // Already defined and cannot be redefined? Or already used?
  if ((d = lookup_by_name_local (t->local_name(), 0)) != 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;
        }
    }

  // 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 0;
    }

  AST_Type *arg_type = t->field_type ();

  // This error is not caught in y.tab.cpp so we check for it here.
  if (arg_type->node_type () == AST_Decl::NT_array
      && arg_type->anonymous () == true)
    {
      idl_global->err ()->syntax_error (idl_global->parse_state ());
    }

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

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

  UTL_ScopedName *mru = arg_type->last_referenced_as ();

  if (mru != 0)
    {
      this->add_to_referenced (arg_type,
                               false,
                               mru->first_component ());
    }

  return t;
}

// Dump this AST_Operation node (an operation) to the ostream o.
void
AST_Operation::dump (ACE_OSTREAM_TYPE &o)
{
  AST_Decl *d = 0;
  AST_Exception *e = 0;
  UTL_String *s = 0;

  if (this->pd_flags == OP_oneway)
    {
      this->dump_i (o, "oneway ");
    }
  else if (this->pd_flags == OP_idempotent)
    {
      this->dump_i (o, "idempotent ");
    }

  this->pd_return_type->name ()->dump (o);
  this->dump_i (o, " ");
  this->local_name ()->dump (o);
  this->dump_i (o, "(");

  // Must advance the iterator explicity inside the loop.
  for (UTL_ScopeActiveIterator i (this, IK_decls); !i.is_done ();)
    {
      d = i.item ();
      d->dump (o);
      i.next ();

      if (!i.is_done())
        {
          this->dump_i (o, ", ");
        }
    }

  this->dump_i (o, ")");

  if (this->pd_exceptions != 0)
    {
      this->dump_i (o, " raises(");

      // Must advance the iterator explicity inside the loop.
      for (UTL_ExceptlistActiveIterator ei (this->pd_exceptions);
           !ei.is_done ();)
        {
          e = ei.item ();
          ei.next ();
          e->local_name ()->dump (o);

          if (!ei.is_done())
            {
             this->dump_i (o, ", ");
            }
        }

      this->dump_i (o, ")");
    }

  if (this->pd_context != 0)
    {
      this->dump_i (o, " context(");

      // Must advance the iterator explicity inside the loop.
      for (UTL_StrlistActiveIterator si (this->pd_context); !si.is_done();)
        {
          s = si.item ();
          si.next ();
          this->dump_i (o, s->get_string ());

          if (!si.is_done())
            {
              this->dump_i (o, ", ");
            }
        }

      this->dump_i (o, ")");
    }
}

int
AST_Operation::ast_accept (ast_visitor *visitor)
{
  return visitor->visit_operation (this);
}

// Data accessors

AST_Type *
AST_Operation::return_type (void)
{
  return this->pd_return_type;
}

AST_Operation::Flags
AST_Operation::flags (void)
{
  return this->pd_flags;
}

UTL_StrList *
AST_Operation::context (void)
{
  return this->pd_context;
}

UTL_ExceptList *
AST_Operation::exceptions (void)
{
  return this->pd_exceptions;
}

// Narrowing.
IMPL_NARROW_METHODS2(AST_Operation, AST_Decl, UTL_Scope)
IMPL_NARROW_FROM_DECL(AST_Operation)
IMPL_NARROW_FROM_SCOPE(AST_Operation)
