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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             S I N P U T . L                              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2008, 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 3,  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 COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This child package contains the routines used to actually load a source

--  file and create entries in the source file table. It also contains the

--  routines to create virtual entries for instantiations. This is separated

--  off into a child package to avoid a dependence of Sinput on Osint which

--  would cause trouble in the tree read/write routines.

package Sinput.L is

   ------------------------------------------

   -- Subprograms for Loading Source Files --

   ------------------------------------------

   function Load_Source_File (N : File_Name_Type) return Source_File_Index;

   --  Given a source file name, returns the index of the corresponding entry

   --  in the source file table. If the file is not currently loaded, then

   --  this is the call that causes the source file to be read and an entry

   --  made in the table. A new entry in the table has the file name and time

   --  stamp entries set and the Casing entries set to Unknown. Version is set

   --  to all blanks, and the lines table is initialized but only the first

   --  entry is set (and Last_Line is set to 1). If the given source file

   --  cannot be opened, then the value returned is No_Source_File.

   function Load_Config_File (N : File_Name_Type) return Source_File_Index;

   --  Similar to Load_Source_File, except that the file name is always

   --  interpreted in the context of the current working directory.

   --  The file is never preprocessed.

   function Load_Definition_File

     (N : File_Name_Type) return Source_File_Index;

   --  Loads preprocessing definition file. Similar to Load_Source_File

   --  except that this file is not itself preprocessed.

   function Load_Preprocessing_Data_File

     (N : File_Name_Type) return Source_File_Index;

   --  Loads preprocessing data file. Similar to Load_Source_File except

   --  that this file is not itself preprocessed.

   procedure Complete_Source_File_Entry;

   --  Called on completing the parsing of a source file. This call completes

   --  the source file table entry for the current source file.

   function Source_File_Is_No_Body (X : Source_File_Index) return Boolean;

   --  Returns true if the designated source file contains pragma No_Body;

   --  and no other tokens. If the source file contains anything other than

   --  this sequence of three tokens, then False is returned.

   function Source_File_Is_Subunit (X : Source_File_Index) return Boolean;

   --  This function determines if a source file represents a subunit. It

   --  works by scanning for the first compilation unit token, and returning

   --  True if it is the token SEPARATE. It will return False otherwise,

   --  meaning that the file cannot possibly be a legal subunit. This

   --  function does NOT do a complete parse of the file, or build a

   --  tree. It is used in the main driver in the check for bad bodies.

   -------------------------------------------------

   -- Subprograms for Dealing With Instantiations --

   -------------------------------------------------

   type Sloc_Adjustment is private;

   --  Type returned by Create_Instantiation_Source for use in subsequent

   --  calls to Adjust_Instantiation_Sloc.

   procedure Create_Instantiation_Source

     (Inst_Node    : Entity_Id;

      Template_Id  : Entity_Id;

      Inlined_Body : Boolean;

      A            : out Sloc_Adjustment);

   --  This procedure creates the source table entry for an instantiation.

   --  Inst_Node is the instantiation node, and Template_Id is the defining

   --  identifier of the generic declaration or body unit as appropriate.

   --  A is set to an adjustment factor to be used in subsequent calls to

   --  Adjust_Instantiation_Sloc. The instantiation mechanism is also used

   --  for inlined function and procedure calls. The parameter Inlined_Body

   --  is set to True in such cases, and False for a generic instantiation.

   --  This is used for generating error messages that distinguish these

   --  two cases, otherwise the two cases are handled identically.

   procedure Adjust_Instantiation_Sloc (N : Node_Id; A : Sloc_Adjustment);

   --  The instantiation tree is created by copying the tree of the generic

   --  template (including the original Sloc values), and then applying

   --  Adjust_Instantiation_Sloc to each copied node to adjust the Sloc

   --  to reference the source entry for the instantiation.

private

   type Sloc_Adjustment is record

      Adjust : Source_Ptr;

      --  Adjustment factor. To be added to source location values in the

      --  source table entry for the template to get corresponding sloc

      --  values for the instantiation image of the template. This is not

      --  really a Source_Ptr value, but rather an offset, but it is more

      --  convenient to represent it as a Source_Ptr value and this is a

      --  private type anyway.

      Lo, Hi : Source_Ptr;

      --  Lo and hi values to which adjustment factor can legitimately

      --  be applied, used to ensure that no incorrect adjustments are

      --  made. Really it is a bug if anyone ever tries to adjust outside

      --  this range, but since we are only doing this anyway for getting

      --  better error messages, it is not critical

   end record;

end Sinput.L;