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--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             S E M _ P R A G                              --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 1992-2004 Free Software Foundation, Inc.          --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
-- MA 02111-1307, USA.                                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --

--  Pragma handling is isolated in a separate package
--  (logically this processing belongs in chapter 4)

with Types; use Types;
package Sem_Prag is

   procedure Analyze_Pragma (N : Node_Id);
   --  Analyze procedure for pragma reference node N

   function Delay_Config_Pragma_Analyze (N : Node_Id) return Boolean;
   --  N is a pragma appearing in a configuration pragma file. Most
   --  such pragmas are analyzed when the file is read, before parsing
   --  and analyzing the main unit. However, the analysis of certain
   --  pragmas results in adding information to the compiled main unit,
   --  and this cannot be done till the main unit is processed. Such
   --  pragmas return True from this function and in Frontend pragmas
   --  where Delay_Config_Pragma_Analyze is True have their analysis
   --  delayed until after the main program is parsed and analyzed.

   function Is_Non_Significant_Pragma_Reference (N : Node_Id) return Boolean;
   --  The node N is a node for an entity and the issue is whether the
   --  occurrence is a reference for the purposes of giving warnings
   --  about unreferenced variables. This function returns True if the
   --  reference is not a reference from this point of view (e.g. the
   --  occurrence in a pragma Pack) and False if it is a real reference
   --  (e.g. the occcurrence in a pragma Export);

   function Is_Pragma_String_Literal (Par : Node_Id) return Boolean;
   --  Given an N_Pragma_Argument_Association node, Par, which has the form
   --  of an operator symbol, determines whether or not it should be treated
   --  as an string literal. This is called by Sem_Ch6.Analyze_Operator_Symbol.
   --  If True is returned, the argument is converted to a string literal. If
   --  False is returned, then the argument is treated as an entity reference
   --  to the operator.

   function Is_Config_Static_String (Arg : Node_Id) return Boolean;
   --  This is called for a configuration pragma that requires either a
   --  string literal or a concatenation of string literals. We cannot
   --  use normal static string processing because it is too early in
   --  the case of the pragma appearing in a configuration pragmas file.
   --  If Arg is of an appropriate form, then this call obtains the string
   --  (doing any necessary concatenations) and places it in Name_Buffer,
   --  setting Name_Len to its length, and then returns True. If it is
   --  not of the correct form, then an appropriate error message is
   --  posted, and False is returned.

   procedure Process_Compilation_Unit_Pragmas (N : Node_Id);
   --  Called at the start of processing compilation unit N to deal with
   --  any special issues regarding pragmas. In particular, we have to
   --  deal with Suppress_All at this stage, since it appears after the
   --  unit instead of before.

   procedure Set_Encoded_Interface_Name (E : Entity_Id; S : Node_Id);
   --  This routine is used to set an encoded interface name. The node
   --  S is an N_String_Literal node for the external name to be set, and
   --  E is an entity whose Interface_Name field is to be set. In the
   --  normal case where S contains a name that is a valid C identifier,
   --  then S is simply set as the value of the Interface_Name. Otherwise
   --  it is encoded. See the body for details of the encoding. This
   --  encoding is only done on VMS systems, since it seems pretty silly,
   --  but is needed to pass some dubious tests in the test suite.

end Sem_Prag;