New Language: Ada

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                              V A L I D S W                               --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.1 $
+--                                                                          --
+--             Copyright (C) 2001 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 2,  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 COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This unit contains the routines used to handle setting of validity
+--  checking options.
+
+package Validsw is
+
+   -----------------------------
+   -- Validity Check Switches --
+   -----------------------------
+
+   --  The following flags determine the specific set of validity checks
+   --  to be made if validity checking is active (Validity_Checks_On = True)
+
+   --  See GNAT users guide for an exact description of each option. The letter
+   --  given in the comment is the letter used in the -gnatV compiler switch
+   --  or in the argument of a Validity_Checks pragma to activate the option.
+   --  The corresponding upper case letter deactivates the option.
+
+   Validity_Check_Copies : Boolean := False;
+   --  Controls the validity checking of copies. If this switch is set to
+   --  true using -gnatVc, or a 'c' in the argument of a Validity_Checks
+   --  pragma, then the right side of assignments and also initializing
+   --  expressions in object declarations are checked for validity.
+
+   Validity_Check_Default : Boolean := True;
+   --  Controls default (reference manual) validity checking. If this switch
+   --  is set to True using -gnatVd or a 'd' in the argument of a Validity_
+   --  Checks pragma then left side subscripts and case statement arguments
+   --  are checked for validity. This switch is also set by default if no
+   --  -gnatV switch is used and no Validity_Checks pragma is processed.
+
+   Validity_Check_Floating_Point : Boolean := False;
+   --  Normally validity checking applies only to discrete values (integer
+   --  and enumeration types). If this switch is set to True using -gnatVf
+   --  or an 'f' in the argument of a Validity_Checks pragma, then floating-
+   --  point values are also checked. The context in which such checks
+   --  occur depends on other flags, e.g. if Validity_Check_Copies is also
+   --  set then floating-point values on the right side of an assignment
+   --  will be validity checked.
+
+   Validity_Check_In_Out_Params : Boolean := False;
+   --  Controls the validity checking of IN OUT parameters. If this switch
+   --  is set to True using -gnatVm or a 'm' in the argument of a pragma
+   --  Validity_Checks, then the initial value of all IN OUT parameters
+   --  will be checked at the point of call of a procecure. Note that the
+   --  character 'm' here stands for modified (parameters).
+
+   Validity_Check_In_Params : Boolean := False;
+   --  Controls the validity checking of IN parameters. If this switch is
+   --  set to True using -gnatVm or an 'i' in the argument of a pragma
+   --  Validity_Checks, then the initial value of all IN parameters
+   --  will be checked at the point of call of a procecure or function.
+
+   Validity_Check_Operands : Boolean := False;
+   --  Controls validity checking of operands. If this switch is set to
+   --  True using -gnatVo or an 'o' in the argument of a Validity_Checks
+   --  pragma, then operands of all predefined operators and attributes
+   --  will be validity checked.
+
+   Validity_Check_Returns : Boolean := False;
+   --  Controls validity checking of returned values. If this switch is set
+   --  to True using -gnatVr, or an 'r' in the argument of a Validity_Checks
+   --  pragma, then the expression in a RETURN statement is validity checked.
+
+   Validity_Check_Subscripts : Boolean := False;
+   --  Controls validity checking of subscripts. If this switch is set to
+   --  True using -gnatVs, or an 's' in the argument of a Validity_Checks
+   --  pragma, then all subscripts are checked for validity. Note that left
+   --  side subscript checking is controlled also by Validity_Check_Default.
+   --  If Validity_Check_Subscripts is True, then all subscripts are checked,
+   --  otherwise if Validity_Check_Default is True, then left side subscripts
+   --  are checked, otherwise no subscripts are checked.
+
+   Validity_Check_Tests : Boolean := False;
+   --  Controls validity checking of tests that occur in conditions (i.e. the
+   --  tests in IF, WHILE, and EXIT statements, and in entry guards). If this
+   --  switch is set to True using -gnatVt, or a 't' in the argument of a
+   --  Validity_Checks pragma, then all such conditions are validity checked.
+
+   -----------------
+   -- Subprograms --
+   -----------------
+
+   procedure Set_Default_Validity_Check_Options;
+   --  This procedure is called to set the default validity checking options
+   --  that apply if no Validity_Check switches or pragma is given.
+
+   procedure Set_Validity_Check_Options
+     (Options  : String;
+      OK       : out Boolean;
+      Err_Col  : out Natural);
+   --  This procedure is called to set the validity check options that
+   --  correspond to the characters in the given Options string. If
+   --  all options are valid, then Set_Default_Validity_Check_Options
+   --  is first called to set the defaults, and then the options in the
+   --  given string are set in an additive manner. If any invalid character
+   --  is found, then OK is False on exit, and Err_Col is the index in
+   --  in options of the bad character. If all options are valid, then
+   --  OK is True on return, and Err_Col is set to options'Last + 1.
+
+   procedure Set_Validity_Check_Options (Options : String);
+   --  Like the above procedure, except that the call is simply ignored if
+   --  there are any error conditions, this is for example appopriate for
+   --  calls where the string is known to be valid, e.g. because it was
+   --  obtained by Save_Validity_Check_Options.
+
+   procedure Reset_Validity_Check_Options;
+   --  Sets all validity check options to off
+
+   subtype Validity_Check_Options is String (1 .. 16);
+   --  Long enough string to hold all options from Save call below
+
+   procedure Save_Validity_Check_Options
+     (Options : out Validity_Check_Options);
+   --  Sets Options to represent current selection of options. This
+   --  set can be restored by first calling Reset_Validity_Check_Options,
+   --  and then calling Set_Validity_Check_Options with the Options string.
+
+end Validsw;