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) 1992-2018, 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 3,  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 COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 --  This child package contains the routines used to actually load a source
  27 --  file and create entries in the source file table. It also contains the
  28 --  routines to create virtual entries for instantiations. This is separated
  29 --  off into a child package to avoid a dependence of Sinput on Osint which
  30 --  would cause trouble in the tree read/write routines.
  31
  32 package Sinput.L is
  33
  34    ------------------------------------------
  35    -- Subprograms for Loading Source Files --
  36    ------------------------------------------
  37
  38    function Load_Source_File (N : File_Name_Type) return Source_File_Index;
  39    --  Given a source file name, returns the index of the corresponding entry
  40    --  in the source file table. If the file is not currently loaded, then
  41    --  this is the call that causes the source file to be read and an entry
  42    --  made in the table. A new entry in the table has the file name and time
  43    --  stamp entries set and the Casing entries set to Unknown. Version is set
  44    --  to all blanks, and the lines table is initialized but only the first
  45    --  entry is set (and Last_Line is set to 1). If the given source file
  46    --  cannot be opened, then the value returned is No_Source_File.
  47
  48    function Load_Config_File (N : File_Name_Type) return Source_File_Index;
  49    --  Similar to Load_Source_File, except that the file name is always
  50    --  interpreted in the context of the current working directory.
  51    --  The file is never preprocessed.
  52
  53    function Load_Definition_File
  54      (N : File_Name_Type) return Source_File_Index;
  55    --  Loads preprocessing definition file. Similar to Load_Source_File
  56    --  except that this file is not itself preprocessed.
  57
  58    function Load_Preprocessing_Data_File
  59      (N : File_Name_Type) return Source_File_Index;
  60    --  Loads preprocessing data file. Similar to Load_Source_File except
  61    --  that this file is not itself preprocessed.
  62
  63    procedure Complete_Source_File_Entry;
  64    --  Called on completing the parsing of a source file. This call completes
  65    --  the source file table entry for the current source file.
  66
  67    function Source_File_Is_Body (X : Source_File_Index) return Boolean;
  68    --  Returns true if the designated source file contains a subprogram body
  69    --  or a package body. This is a limited scan just to determine the answer
  70    --  to this question.
  71
  72    function Source_File_Is_No_Body (X : Source_File_Index) return Boolean;
  73    --  Returns true if the designated source file contains pragma No_Body;
  74    --  and no other tokens. If the source file contains anything other than
  75    --  this sequence of three tokens, then False is returned.
  76
  77    -------------------------------------------------
  78    -- Subprograms for Dealing With Instantiations --
  79    -------------------------------------------------
  80
  81    type Sloc_Adjustment is private;
  82    --  Type returned by Create_Instantiation_Source for use in subsequent calls
  83    --  to Adjust_Instantiation_Sloc.
  84
  85    procedure Adjust_Instantiation_Sloc
  86      (N      : Node_Id;
  87       Factor : Sloc_Adjustment);
  88    --  The instantiation tree is created by copying the tree of the generic
  89    --  template (including the original Sloc values), and then applying
  90    --  Adjust_Instantiation_Sloc to each copied node to adjust the Sloc to
  91    --  reference the source entry for the instantiation.
  92
  93    procedure Create_Instantiation_Source
  94      (Inst_Node        : Entity_Id;
  95       Template_Id      : Entity_Id;
  96       Factor           : out Sloc_Adjustment;
  97       Inlined_Body     : Boolean := False;
  98       Inherited_Pragma : Boolean := False);
  99    --  This procedure creates the source table entry for an instantiation.
 100    --  Inst_Node is the instantiation node, and Template_Id is the defining
 101    --  identifier of the generic declaration or body unit as appropriate.
 102    --  Factor is set to an adjustment factor to be used in subsequent calls to
 103    --  Adjust_Instantiation_Sloc. Template_Id can also be a subunit body that
 104    --  replaces a stub in a generic unit.
 105    --
 106    --  The instantiation mechanism is also used for inlined function and
 107    --  procedure calls. The parameter Inlined_Body is set to True in such
 108    --  cases. This is used for generating error messages that distinguish these
 109    --  two cases, otherwise the two cases are handled identically. Similarly,
 110    --  the instantiation mechanism is also used for inherited class-wide pre-
 111    --  and postconditions. Parameter Inherited_Pragma is set to True in such
 112    --  cases.
 113
 114 private
 115
 116    type Sloc_Adjustment is record
 117       Adjust : Source_Ptr;
 118       --  Adjustment factor. To be added to source location values in the
 119       --  source table entry for the template to get corresponding sloc
 120       --  values for the instantiation image of the template. This is not
 121       --  really a Source_Ptr value, but rather an offset, but it is more
 122       --  convenient to represent it as a Source_Ptr value and this is a
 123       --  private type anyway.
 124
 125       Lo, Hi : Source_Ptr;
 126       --  Lo and hi values to which adjustment factor can legitimately
 127       --  be applied, used to ensure that no incorrect adjustments are
 128       --  made. Really it is a bug if anyone ever tries to adjust outside
 129       --  this range, but since we are only doing this anyway for getting
 130       --  better error messages, it is not critical.
 131
 132    end record;
 133
 134 end Sinput.L;