gcc/ada/libgnat/s-restri.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                  S Y S T E M . R E S T R I C T I O N S                   --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2004-2017, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package provides a run-time interface for checking the set of
  33 --  restrictions that applies to the current partition. The information
  34 --  comes both from explicit restriction pragmas present, and also from
  35 --  compile time checking.
  36
  37 --  The package simply contains an instantiation of System.Rident, but
  38 --  with names discarded, so that we do not have image tables for the
  39 --  large restriction enumeration types at run time.
  40
  41 pragma Compiler_Unit_Warning;
  42
  43 with System.Rident;
  44
  45 package System.Restrictions is
  46    pragma Preelaborate;
  47
  48    pragma Discard_Names;
  49    package Rident is new System.Rident;
  50    --  Instantiate a copy of System.Rident without enumeration image names
  51
  52    Run_Time_Restrictions : Rident.Restrictions_Info;
  53    --  Restrictions as set by the user, or detected by the binder. See details
  54    --  in package System.Rident for what restrictions are included in the list
  55    --  and the format of the information.
  56    --
  57    --  Note that a restriction which is both Set and Violated at run-time means
  58    --  that the violation was detected as part of the Ada run-time and not as
  59    --  part of user code.
  60
  61    ------------------
  62    -- Subprograms --
  63    -----------------
  64
  65    function Abort_Allowed return Boolean;
  66    pragma Inline (Abort_Allowed);
  67    --  Tests to see if abort is allowed by the current restrictions settings.
  68    --  For abort to be allowed, either No_Abort_Statements must be False, or
  69    --  Max_Asynchronous_Select_Nesting must be non-zero.
  70
  71    function Tasking_Allowed return Boolean;
  72    pragma Inline (Tasking_Allowed);
  73    --  Tests to see if tasking operations are allowed by the current
  74    --  restrictions settings. For tasking to be allowed, No_Tasking must
  75    --  be False, and Max_Tasks must not be set to zero.
  76
  77 end System.Restrictions;