| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- V A L I D S W -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2001-2012, 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 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_Components : Boolean := False; |
| -- Controls validity checking for assignment to elementary components of |
| -- records. If this switch is set true using -gnatVe, or an 'e' in the |
| -- argument of Validity_Checks pragma, then the right hand of an assignment |
| -- to such a component is 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 (or the initial default value is used, set True), 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 procedure. 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 -gnatVi 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 procedure 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_Parameters : Boolean := False; |
| -- This controls validity treatment for parameters within a subprogram. |
| -- Normally if validity checking is enabled for parameters on a call |
| -- (Validity_Check_In[_Out]_Params) then an assumption is made that the |
| -- parameter values are valid on entry and not checked again within a |
| -- procedure. Setting Validity_Check_Parameters removes this assumption |
| -- and ensures that no assumptions are made about parameters, so that |
| -- they will always be 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. |
| |
| Force_Validity_Checks : Boolean := False; |
| -- Normally, operands that do not come from source (i.e. cases of expander |
| -- generated code) are not checked, if this flag is set True, then checking |
| -- of such operands is forced (if Validity_Check_Operands is set). |
| |
| ----------------- |
| -- 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 appropriate 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; |
