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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- E R R _ V A R S --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2012, 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package contains variables common to error reporting packages
+-- including Errout and Prj.Err.
+
+with Namet; use Namet;
+with Types; use Types;
+with Uintp; use Uintp;
+
+package Err_Vars is
+
+ -- All of these variables are set when needed, so they do not need to be
+ -- initialized. However, there is code that saves and restores existing
+ -- values, which may malfunction in -gnatVa mode if the variable has never
+ -- been initialized, so we initialize some variables to avoid exceptions
+ -- from invalid values in such cases.
+
+ -- Note on error counts (Serious_Errors_Detected, Total_Errors_Detected,
+ -- Warnings_Detected). These counts might more logically appear in this
+ -- unit, but we place them in atree.ads, because of licensing issues. We
+ -- need to be able to access these counts from units that have the more
+ -- general licensing conditions.
+
+ ----------------------------------
+ -- Error Message Mode Variables --
+ ----------------------------------
+
+ -- These variables control special error message modes. The initialized
+ -- values below give the normal default behavior, but they can be reset
+ -- by the caller to get different behavior as noted in the comments. These
+ -- variables are not reset by calls to the error message routines, so the
+ -- caller is responsible for resetting the default behavior after use.
+
+ Error_Msg_Qual_Level : Int;
+ -- Number of levels of qualification required for type name (see the
+ -- description of the } insertion character. Note that this value does
+ -- note get reset by any Error_Msg call, so the caller is responsible
+ -- for resetting it.
+
+ Warn_On_Instance : Boolean := False;
+ -- Normally if a warning is generated in a generic template from the
+ -- analysis of the template, then the warning really belongs in the
+ -- template, and the default value of False for this Boolean achieves
+ -- that effect. If Warn_On_Instance is set True, then the warnings are
+ -- generated on the instantiation (referring to the template) rather
+ -- than on the template itself.
+
+ Raise_Exception_On_Error : Nat := 0;
+ -- If this value is non-zero, then any attempt to generate an error
+ -- message raises the exception Error_Msg_Exception, and the error
+ -- message is not output. This is used for defending against junk
+ -- resulting from illegalities, and also for substitution of more
+ -- appropriate error messages from higher semantic levels. It is
+ -- a counter so that the increment/decrement protocol nests neatly.
+ -- Initialized for -gnatVa use, see comment above.
+
+ Error_Msg_Exception : exception;
+ -- Exception raised if Raise_Exception_On_Error is true
+
+ Current_Error_Source_File : Source_File_Index := Internal_Source_File;
+ -- Id of current messages. Used to post file name when unit changes. This
+ -- is initialized to Main_Source_File at the start of a compilation, which
+ -- means that no file names will be output unless there are errors in units
+ -- other than the main unit. However, if the main unit has a pragma
+ -- Source_Reference line, then this is initialized to No_Source_File,
+ -- to force an initial reference to the real source file name.
+
+ Warning_Doc_Switch : Boolean := False;
+ -- If this is set True, then the ??/?x?/?x? sequences in error messages
+ -- are active (see errout.ads for details). If this switch is False, then
+ -- these sequences are ignored (i.e. simply equivalent to a single ?). The
+ -- -gnatw.d switch sets this flag True, -gnatw.D sets this flag False.
+
+ ----------------------------------------
+ -- Error Message Insertion Parameters --
+ ----------------------------------------
+
+ -- The error message routines work with strings that contain insertion
+ -- sequences that result in the insertion of variable data. The following
+ -- variables contain the required data. The procedure is to set one or more
+ -- of the following global variables to appropriate values before making a
+ -- call to one of the error message routines with a string containing the
+ -- insertion character to get the value inserted in an appropriate format.
+
+ Error_Msg_Col : Column_Number;
+ -- Column for @ insertion character in message
+
+ Error_Msg_Uint_1 : Uint;
+ Error_Msg_Uint_2 : Uint;
+ -- Uint values for ^ insertion characters in message
+
+ Error_Msg_Sloc : Source_Ptr;
+ -- Source location for # insertion character in message
+
+ Error_Msg_Name_1 : Name_Id;
+ Error_Msg_Name_2 : Name_Id;
+ Error_Msg_Name_3 : Name_Id;
+ -- Name_Id values for % insertion characters in message
+
+ Error_Msg_File_1 : File_Name_Type;
+ Error_Msg_File_2 : File_Name_Type;
+ Error_Msg_File_3 : File_Name_Type;
+ -- File_Name_Type values for { insertion characters in message
+
+ Error_Msg_Unit_1 : Unit_Name_Type;
+ Error_Msg_Unit_2 : Unit_Name_Type;
+ -- Unit_Name_Type values for $ insertion characters in message
+
+ Error_Msg_Node_1 : Node_Id;
+ Error_Msg_Node_2 : Node_Id;
+ -- Node_Id values for & insertion characters in message
+
+ Error_Msg_Warn : Boolean;
+ -- Used if current message contains a < insertion character to indicate
+ -- if the current message is a warning message. Must be set appropriately
+ -- before any call to Error_Msg_xxx with a < insertion character present.
+ -- Setting is irrelevant if no < insertion character is present. Note
+ -- that it is not necessary to reset this after using it, since the proper
+ -- procedure is always to set it before issuing such a message. Note that
+ -- the warning documentation tag is always [enabled by default] in the
+ -- case where this flag is True.
+
+ Error_Msg_String : String (1 .. 4096);
+ Error_Msg_Strlen : Natural;
+ -- Used if current message contains a ~ insertion character to indicate
+ -- insertion of the string Error_Msg_String (1 .. Error_Msg_Strlen).
+
+end Err_Vars;