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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- V A L I D S W --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- 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. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- 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;
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