gcc/ada/err_vars.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             E R R _ V A R S                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2017, 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 package contains variables common to error reporting packages
  27 --  including Errout and Prj.Err.
  28
  29 with Namet; use Namet;
  30 with Types; use Types;
  31 with Uintp; use Uintp;
  32
  33 package Err_Vars is
  34
  35    --  All of these variables are set when needed, so they do not need to be
  36    --  initialized. However, there is code that saves and restores existing
  37    --  values, which may malfunction in -gnatVa mode if the variable has never
  38    --  been initialized, so we initialize some variables to avoid exceptions
  39    --  from invalid values in such cases.
  40
  41    --  Note on error counts (Serious_Errors_Detected, Total_Errors_Detected,
  42    --  Warnings_Detected, Warning_Info_Messages, Report_Info_Messages). These
  43    --  counts might more logically appear in this unit, but we place them
  44    --  instead in atree.ads, because of licensing issues. We need to be able
  45    --  to access these counts from units that have the more general licensing
  46    --  conditions.
  47
  48    ----------------------------------
  49    -- Error Message Mode Variables --
  50    ----------------------------------
  51
  52    --  These variables control special error message modes. The initialized
  53    --  values below give the normal default behavior, but they can be reset
  54    --  by the caller to get different behavior as noted in the comments. These
  55    --  variables are not reset by calls to the error message routines, so the
  56    --  caller is responsible for resetting the default behavior after use.
  57
  58    Error_Msg_Qual_Level : Nat := 0;
  59    --  Number of levels of qualification required for type name (see the
  60    --  description of the } insertion character. Note that this value does
  61    --  not get reset by any Error_Msg call, so the caller is responsible
  62    --  for resetting it.
  63
  64    Warn_On_Instance : Boolean := False;
  65    --  Normally if a warning is generated in a generic template from the
  66    --  analysis of the template, then the warning really belongs in the
  67    --  template, and the default value of False for this Boolean achieves
  68    --  that effect. If Warn_On_Instance is set True, then the warnings are
  69    --  generated on the instantiation (referring to the template) rather
  70    --  than on the template itself.
  71
  72    Raise_Exception_On_Error : Nat := 0;
  73    --  If this value is non-zero, then any attempt to generate an error
  74    --  message raises the exception Error_Msg_Exception, and the error
  75    --  message is not output. This is used for defending against junk
  76    --  resulting from illegalities, and also for substitution of more
  77    --  appropriate error messages from higher semantic levels. It is
  78    --  a counter so that the increment/decrement protocol nests neatly.
  79    --  Initialized for -gnatVa use, see comment above.
  80
  81    Error_Msg_Exception : exception;
  82    --  Exception raised if Raise_Exception_On_Error is true
  83
  84    Current_Error_Source_File : Source_File_Index := No_Source_File;
  85    --  Id of current messages. Used to post file name when unit changes. This
  86    --  is initialized to Main_Source_File at the start of a compilation, which
  87    --  means that no file names will be output unless there are errors in units
  88    --  other than the main unit. However, if the main unit has a pragma
  89    --  Source_Reference line, then this is initialized to No_Source_File,
  90    --  to force an initial reference to the real source file name.
  91
  92    Warning_Doc_Switch : Boolean := False;
  93    --  If this is set True, then the ??/?x?/?x? sequences in error messages
  94    --  are active (see errout.ads for details). If this switch is False, then
  95    --  these sequences are ignored (i.e. simply equivalent to a single ?). The
  96    --  -gnatw.d switch sets this flag True, -gnatw.D sets this flag False.
  97
  98    ----------------------------------------
  99    -- Error Message Insertion Parameters --
 100    ----------------------------------------
 101
 102    --  The error message routines work with strings that contain insertion
 103    --  sequences that result in the insertion of variable data. The following
 104    --  variables contain the required data. The procedure is to set one or more
 105    --  of the following global variables to appropriate values before making a
 106    --  call to one of the error message routines with a string containing the
 107    --  insertion character to get the value inserted in an appropriate format.
 108
 109    Error_Msg_Col : Column_Number;
 110    --  Column for @ insertion character in message
 111
 112    Error_Msg_Uint_1 : Uint;
 113    Error_Msg_Uint_2 : Uint;
 114    --  Uint values for ^ insertion characters in message
 115
 116    Error_Msg_Sloc : Source_Ptr;
 117    --  Source location for # insertion character in message
 118
 119    Error_Msg_Name_1 : Name_Id;
 120    Error_Msg_Name_2 : Name_Id;
 121    Error_Msg_Name_3 : Name_Id;
 122    --  Name_Id values for % insertion characters in message
 123
 124    Error_Msg_File_1 : File_Name_Type;
 125    Error_Msg_File_2 : File_Name_Type;
 126    Error_Msg_File_3 : File_Name_Type;
 127    --  File_Name_Type values for { insertion characters in message
 128
 129    Error_Msg_Unit_1 : Unit_Name_Type;
 130    Error_Msg_Unit_2 : Unit_Name_Type;
 131    --  Unit_Name_Type values for $ insertion characters in message
 132
 133    Error_Msg_Node_1 : Node_Id;
 134    Error_Msg_Node_2 : Node_Id;
 135    --  Node_Id values for & insertion characters in message
 136
 137    Error_Msg_Warn : Boolean;
 138    --  Used if current message contains a < insertion character to indicate
 139    --  if the current message is a warning message. Must be set appropriately
 140    --  before any call to Error_Msg_xxx with a < insertion character present.
 141    --  Setting is irrelevant if no < insertion character is present. Note
 142    --  that it is not necessary to reset this after using it, since the proper
 143    --  procedure is always to set it before issuing such a message. Note that
 144    --  the warning documentation tag is always [enabled by default] in the
 145    --  case where this flag is True.
 146
 147    Error_Msg_String : String (1 .. 4096);
 148    Error_Msg_Strlen : Natural;
 149    --  Used if current message contains a ~ insertion character to indicate
 150    --  insertion of the string Error_Msg_String (1 .. Error_Msg_Strlen).
 151
 152 end Err_Vars;