array_cs.cpp

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//
// array_cs.cpp,v 1.24 2003/10/28 18:30:37 bala Exp
//

// ============================================================================
//
// = LIBRARY
//    TAO IDL
//
// = FILENAME
//    array_cs.cpp
//
// = DESCRIPTION
//    Visitor for code generation of Arrays in the client stubs
//
// = AUTHOR
//    Aniruddha Gokhale
//
// ============================================================================

ACE_RCSID (be_visitor_array, 
           array_cs, 
           "array_cs.cpp,v 1.24 2003/10/28 18:30:37 bala Exp")

// ************************************************************************
//  visitor for array declaration in client stubs
// ************************************************************************

be_visitor_array_cs::be_visitor_array_cs (be_visitor_context *ctx)
  : be_visitor_array (ctx)
{
}

be_visitor_array_cs::~be_visitor_array_cs (void)
{
}

int be_visitor_array_cs::visit_array (be_array *node)
{
  // Nothing to do if we are imported or code is already generated.
  if (node->imported () || (node->cli_stub_gen ()))
    {
      return 0;
    }

  TAO_OutStream *os = this->ctx_->stream ();
  unsigned long i;
  this->ctx_->node (node);

  // Retrieve the type.
  be_type *bt = be_type::narrow_from_decl (node->base_type ());

  if (!bt)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         "be_visitor_array_cs::"
                         "visit_array - "
                         "Bad base type\n"),
                        -1);
    }

  // To hold the full and local.
  char fname [NAMEBUFSIZE];
  char lname [NAMEBUFSIZE];
  ACE_OS::memset (fname, 
                  '\0', 
                  NAMEBUFSIZE);
  ACE_OS::memset (lname, 
                  '\0', 
                  NAMEBUFSIZE);

  if (this->ctx_->tdef ())
    {
      // Typedefed node.
      ACE_OS::sprintf (fname, "%s", 
                       node->full_name ());
      ACE_OS::sprintf (lname, "%s",
                       node->local_name ()->get_string ());
    }
  else
    {
      // For anonymous arrays ...
      // we have to generate a name for us that has an underscope prepended to
      // our local name. This needs to be inserted after the parents's name.
      if (node->is_nested ())
        {
          be_decl *parent = 
            be_scope::narrow_from_scope (node->defined_in ())->decl ();
          ACE_OS::sprintf (fname, 
                           "%s::_%s", 
                           parent->full_name (),
                           node->local_name ()->get_string ());
          ACE_OS::sprintf (lname, 
                           "_%s",
                           node->local_name ()->get_string ());
        }
      else
        {
          ACE_OS::sprintf (fname, 
                           "_%s", 
                           node->full_name ());
          ACE_OS::sprintf (lname, 
                           "_%s",
                           node->local_name ()->get_string ());
        }
    }

  *os << be_nl << be_nl << "// TAO_IDL - Generated from" << be_nl
      << "// " << __FILE__ << ":" << __LINE__ << be_nl << be_nl;

  // dup method.
  *os << fname << "_slice *" << be_nl
      << fname << "_dup (const " << fname
      << "_slice *_tao_src_array)" << be_nl;
  *os << "{" << be_idt_nl;
  *os << fname << "_slice *_tao_dup_array =" << be_idt_nl
      << fname << "_alloc ();" << be_uidt_nl << be_nl;
  *os << "if (!_tao_dup_array)" << be_idt_nl
      << "{" << be_idt_nl
      << "return (" << fname
      << "_slice *)0;" << be_uidt_nl
      << "}" << be_uidt_nl << be_nl;
  *os << fname << "_copy (_tao_dup_array, _tao_src_array);" << be_nl;
  *os << "return _tao_dup_array;" << be_uidt_nl;
  *os << "}" << be_nl << be_nl;

  // alloc method.
  *os << fname << "_slice *" << be_nl;
  *os << fname << "_alloc (void)" << be_nl;
  *os << "{" << be_idt_nl;
  *os << fname << "_slice *retval = 0;" << be_nl;
  *os << "ACE_NEW_RETURN (retval, ";

  if (bt->accept (this) == -1)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         "be_visitor_array_cs::"
                         "visit_array - "
                         "base type decl failed\n"),
                        -1);
    }

  if (node->gen_dimensions (os) == -1)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         "(%N:%l) be_visitor_array_cs::"
                         "visit_array - "
                         "dimensions codegen failed\n"),
                        -1);
    }

  *os << ", 0);" << be_nl;
  *os << "return retval;" << be_uidt_nl;
  *os << "}" << be_nl << be_nl;

  // free method.
  *os << "void" << be_nl
      << fname << "_free (" << be_idt << be_idt_nl
      << fname << "_slice *_tao_slice" << be_uidt_nl
      << ")" << be_uidt_nl;
  *os << "{" << be_idt_nl;
  *os << "delete [] _tao_slice;" << be_uidt_nl;
  *os << "}" << be_nl << be_nl;

  // copy method.
  *os << "void " << be_nl;
  *os << fname << "_copy (" << be_idt << be_idt_nl
      << fname << "_slice * _tao_to," << be_nl
      << "const " << fname << "_slice *_tao_from" << be_uidt_nl
      << ")" << be_uidt_nl;
  *os << "{" << be_idt_nl;
  *os << "// Copy each individual element." << be_nl;

  unsigned long ndims = node->n_dims ();

  // Generate nested loops for as many dimensions as there are.
  for (i = 0; i < ndims; ++i)
    {
      // Retrieve the ith dimension value.
      AST_Expression *expr = node->dims ()[i];

      if ((expr == 0) || ((expr != 0) && (expr->ev () == 0)))
        {
          ACE_ERROR_RETURN ((LM_ERROR,
                             "(%N:%l) be_visitor_array_cs::"
                             "visit_array - "
                             "bad array dimension\n"),
                            -1);
        }

      if (expr->ev ()->et == AST_Expression::EV_ulong)
        {
          // Generate a loop for each dimension.
          *os << "for (CORBA::ULong i" << i << " = 0; i" << i << " < "
              << expr->ev ()->u.ulval << "; ++i" << i << ")" << be_idt_nl
              << "{" << be_idt_nl;
        }
      else
        {
          ACE_ERROR_RETURN ((LM_ERROR,
                             "(%N:%l) be_visitor_array_cs::"
                             "visit_array - "
                             "bad array dimension value\n"),
                            -1);
        }
    }

  // Now generate code such that every element of the array gets assigned
  // inside the innermost level of the  nested loops generated above.
  be_array *primitive_type = 0;

  if (bt->node_type () == AST_Decl::NT_typedef)
    {
      // Base type of the array node is a typedef. We need to make sure that
      // this typedef is not to another array type. If it is, then we cannot
      // assign an array to another. We will have to invoke the underlying
      // array type's copy method for every array dimension.

      // There may be more than one level of typedef.
      be_type *tmp = bt;

      while (tmp->node_type () == AST_Decl::NT_typedef)
        {
          be_typedef *tdef = be_typedef::narrow_from_decl (tmp);
          tmp = be_type::narrow_from_decl (tdef->base_type ());
        }

      primitive_type = be_array::narrow_from_decl (tmp);
    }

  if (primitive_type)
    {
      // The base type is a typedef to another array type, so
      // we use the base type's copy method.
      *os << "// call the underlying _copy" << be_nl;

      if (bt->accept (this) == -1)
        {
          ACE_ERROR_RETURN ((LM_ERROR,
                             "be_visitor_array_cs::"
                             "visit_array - "
                             "base type decl failed\n"),
                            -1);
        }

      *os << "_copy (_tao_to";

      for (i = 0; i < ndims; ++i)
        {
          *os << "[i" << i << "]";
        }

      *os << ", ";
      *os << "_tao_from";

      for (i = 0; i < ndims; ++i)
        {
          *os << "[i" << i << "]";
        }

      *os << ");";
    }
  else
    {
      // The base type is not a typedef to possibly another array type. In
      // such a case, assign each element.

      *os << "_tao_to";

      for (i = 0; i < ndims; ++i)
        {
          *os << "[i" << i << "]";
        }

      *os << " = ";
      *os << "_tao_from";

      for (i = 0; i < ndims; ++i)
        {
          *os << "[i" << i << "]";
        }

      *os << ";";
    }

  for (i = 0; i < ndims; ++i)
    {
      // Add closing braces as many times as the number of dimensions.
      *os << be_uidt_nl << "}" << be_uidt;
    }

  *os << be_uidt_nl << "}";

  AST_Decl::NodeType nt = bt->node_type ();

  // If we contain an anonymous sequence,
  // generate code for the sequence here.
  if (nt == AST_Decl::NT_sequence)
    {
      if (this->gen_anonymous_base_type (bt,
                                         TAO_CodeGen::TAO_ROOT_CS)
          == -1)
        {
          ACE_ERROR_RETURN ((LM_ERROR,
                             "(%N:%l) be_visitor_array_cs::"
                             "visit_array - "
                             "gen_anonymous_base_type failed\n"),
                            -1);
        }
    }

  // If the member's element type
  // is a declaration (not a reference), we must generate code for
  // the declaration.
  if (this->ctx_->alias () == 0 // Not a typedef.
      && bt->is_child (this->ctx_->scope ()))
    {
      int status = 0;
      be_visitor_context ctx (*this->ctx_);

      switch (nt)
      {
        case AST_Decl::NT_enum:
          {
            be_visitor_enum_cs ec_visitor (&ctx);
            status = bt->accept (&ec_visitor);
            break;
          }
        case AST_Decl::NT_struct:
          {
            be_visitor_structure_cs sc_visitor (&ctx);
            status = bt->accept (&sc_visitor);
            break;
          }
        case AST_Decl::NT_union:
          {
            be_visitor_union_cs uc_visitor (&ctx);
            status = bt->accept (&uc_visitor);
            break;
          }
        default:
          break;
      }

      if (status == -1)
        {
          ACE_ERROR_RETURN ((LM_ERROR,
                             "(%N:%l) be_visitor_array_ch::"
                             "visit_array - "
                             "array base type codegen failed\n"),
                            -1);
        }
    }

  node->cli_stub_gen (I_TRUE);
  return 0;
}