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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . R E S T R I C T I O N S --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 2004-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package provides a run-time interface for checking the set of
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33 -- restrictions that applies to the current partition. The information
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34 -- comes both from explicit restriction pragmas present, and also from
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35 -- compile time checking.
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36
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37 -- The package simply contains an instantiation of System.Rident, but
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38 -- with names discarded, so that we do not have image tables for the
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39 -- large restriction enumeration types at run time.
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40
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41 pragma Compiler_Unit_Warning;
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42
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43 with System.Rident;
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44
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45 package System.Restrictions is
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46 pragma Preelaborate;
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47
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48 pragma Discard_Names;
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49 package Rident is new System.Rident;
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50 -- Instantiate a copy of System.Rident without enumeration image names
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51
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52 Run_Time_Restrictions : Rident.Restrictions_Info;
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53 -- Restrictions as set by the user, or detected by the binder. See details
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54 -- in package System.Rident for what restrictions are included in the list
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55 -- and the format of the information.
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56 --
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57 -- Note that a restriction which is both Set and Violated at run-time means
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58 -- that the violation was detected as part of the Ada run-time and not as
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59 -- part of user code.
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60
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61 ------------------
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62 -- Subprograms --
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63 -----------------
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64
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65 function Abort_Allowed return Boolean;
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66 pragma Inline (Abort_Allowed);
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67 -- Tests to see if abort is allowed by the current restrictions settings.
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68 -- For abort to be allowed, either No_Abort_Statements must be False, or
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69 -- Max_Asynchronous_Select_Nesting must be non-zero.
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70
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71 function Tasking_Allowed return Boolean;
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72 pragma Inline (Tasking_Allowed);
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73 -- Tests to see if tasking operations are allowed by the current
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74 -- restrictions settings. For tasking to be allowed, No_Tasking must
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75 -- be False, and Max_Tasks must not be set to zero.
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76
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77 end System.Restrictions;
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