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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 . P A R A M E T E R S --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1995-2018, 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 is the default (used on all native platforms) version of this package
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33
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34 pragma Compiler_Unit_Warning;
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35
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36 package body System.Parameters is
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37
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38 -------------------------
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39 -- Adjust_Storage_Size --
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40 -------------------------
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41
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42 function Adjust_Storage_Size (Size : Size_Type) return Size_Type is
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43 begin
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44 if Size = Unspecified_Size then
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45 return Default_Stack_Size;
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46 elsif Size < Minimum_Stack_Size then
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47 return Minimum_Stack_Size;
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48 else
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49 return Size;
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50 end if;
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51 end Adjust_Storage_Size;
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52
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53 ------------------------
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54 -- Default_Stack_Size --
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55 ------------------------
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56
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57 function Default_Stack_Size return Size_Type is
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58 Default_Stack_Size : Integer;
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59 pragma Import (C, Default_Stack_Size, "__gl_default_stack_size");
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60 begin
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61 if Default_Stack_Size = -1 then
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62 return 2 * 1024 * 1024;
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63 else
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64 return Size_Type (Default_Stack_Size);
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65 end if;
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66 end Default_Stack_Size;
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67
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68 ------------------------
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69 -- Minimum_Stack_Size --
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70 ------------------------
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71
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72 function Minimum_Stack_Size return Size_Type is
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73 begin
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74 -- 12K is required for stack-checking to work reliably on most platforms
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75 -- when using the GCC scheme to propagate an exception in the ZCX case.
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76 -- 16K is the value of PTHREAD_STACK_MIN under Linux, so is a reasonable
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77 -- default.
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78
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79 return 16 * 1024;
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80 end Minimum_Stack_Size;
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81
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82 end System.Parameters;
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