gcc/ada/sinput-l.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             S I N P U T . L                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2004, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 --  This child package contains the routines used to actually load a source
  28 --  file and create entries in the source file table. It also contains the
  29 --  routines to create virtual entries for instantiations. This is separated
  30 --  off into a child package to avoid a dependence of Sinput on Osint which
  31 --  would cause trouble in the tree read/write routines.
  32
  33 with Types; use Types;
  34
  35 package Sinput.L is
  36
  37    ------------------------------------------
  38    -- Subprograms for Loading Source Files --
  39    ------------------------------------------
  40
  41    function Load_Source_File (N : File_Name_Type) return Source_File_Index;
  42    --  Given a source file name, returns the index of the corresponding entry
  43    --  in the source file table. If the file is not currently loaded, then
  44    --  this is the call that causes the source file to be read and an entry
  45    --  made in the table. A new entry in the table has the file name and time
  46    --  stamp entries set and the Casing entries set to Unknown. Version is set
  47    --  to all blanks, and the lines table is initialized but only the first
  48    --  entry is set (and Last_Line is set to 1). If the given source file
  49    --  cannot be opened, then the value returned is No_Source_File.
  50
  51    function Load_Config_File (N : File_Name_Type) return Source_File_Index;
  52    --  Similar to Load_Source_File, except that the file name is always
  53    --  interpreted in the context of the current working directory.
  54    --  The file is never preprocessed.
  55
  56    function Load_Definition_File
  57      (N : File_Name_Type) return Source_File_Index;
  58    --  Loads preprocessing definition file. Similar to Load_Source_File
  59    --  except that this file is not itself preprocessed.
  60
  61    function Load_Preprocessing_Data_File
  62      (N : File_Name_Type) return Source_File_Index;
  63    --  Loads preprocessing data file. Similar to Load_Source_File except
  64    --  that this file is not itself preprocessed.
  65
  66    procedure Complete_Source_File_Entry;
  67    --  Called on completing the parsing of a source file. This call completes
  68    --  the source file table entry for the current source file.
  69
  70    function Source_File_Is_Subunit (X : Source_File_Index) return Boolean;
  71    --  This function determines if a source file represents a subunit. It
  72    --  works by scanning for the first compilation unit token, and returning
  73    --  True if it is the token SEPARATE. It will return False otherwise,
  74    --  meaning that the file cannot possibly be a legal subunit. This
  75    --  function does NOT do a complete parse of the file, or build a
  76    --  tree. It is used in the main driver in the check for bad bodies.
  77
  78    -------------------------------------------------
  79    -- Subprograms for Dealing With Instantiations --
  80    -------------------------------------------------
  81
  82    type Sloc_Adjustment is private;
  83    --  Type returned by Create_Instantiation_Source for use in subsequent
  84    --  calls to Adjust_Instantiation_Sloc.
  85
  86    procedure Create_Instantiation_Source
  87      (Inst_Node    : Entity_Id;
  88       Template_Id  : Entity_Id;
  89       Inlined_Body : Boolean;
  90       A            : out Sloc_Adjustment);
  91    --  This procedure creates the source table entry for an instantiation.
  92    --  Inst_Node is the instantiation node, and Template_Id is the defining
  93    --  identifier of the generic declaration or body unit as appropriate.
  94    --  A is set to an adjustment factor to be used in subsequent calls to
  95    --  Adjust_Instantiation_Sloc. The instantiation mechnaism is also used
  96    --  for inlined function and procedure calls. The parameter Inlined_Body
  97    --  is set to True in such cases, and False for a generic instantiation.
  98    --  This is used for generating error messages that distinguish these
  99    --  two cases, otherwise the two cases are handled identically.
 100
 101    procedure Adjust_Instantiation_Sloc (N : Node_Id; A : Sloc_Adjustment);
 102    --  The instantiation tree is created by copying the tree of the generic
 103    --  template (including the original Sloc values), and then applying
 104    --  Adjust_Instantiation_Sloc to each copied node to adjust the Sloc
 105    --  to reference the source entry for the instantiation.
 106
 107 private
 108
 109    type Sloc_Adjustment is record
 110       Adjust : Source_Ptr;
 111       --  Adjustment factor. To be added to source location values in the
 112       --  source table entry for the template to get corresponding sloc
 113       --  values for the instantiation image of the template. This is not
 114       --  really a Source_Ptr value, but rather an offset, but it is more
 115       --  convenient to represent it as a Source_Ptr value and this is a
 116       --  private type anyway.
 117
 118       Lo, Hi : Source_Ptr;
 119       --  Lo and hi values to which adjustment factor can legitimately
 120       --  be applied, used to ensure that no incorrect adjustments are
 121       --  made. Really it is a bug if anyone ever tries to adjust outside
 122       --  this range, but since we are only doing this anyway for getting
 123       --  better error messages, it is not critical
 124
 125    end record;
 126
 127 end Sinput.L;