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Diffstat (limited to 'gcc-4.9/gcc/ada/validsw.ads')
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diff --git a/gcc-4.9/gcc/ada/validsw.ads b/gcc-4.9/gcc/ada/validsw.ads new file mode 100644 index 000000000..db9ceb214 --- /dev/null +++ b/gcc-4.9/gcc/ada/validsw.ads @@ -0,0 +1,164 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |