Mercurial > hg > CbC > CbC_gcc
view gcc/ada/libgnat/s-parame.adb @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . P A R A M E T E R S -- -- -- -- B o d y -- -- -- -- Copyright (C) 1995-2017, 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This is the default (used on all native platforms) version of this package pragma Compiler_Unit_Warning; package body System.Parameters is ------------------------- -- Adjust_Storage_Size -- ------------------------- function Adjust_Storage_Size (Size : Size_Type) return Size_Type is begin if Size = Unspecified_Size then return Default_Stack_Size; elsif Size < Minimum_Stack_Size then return Minimum_Stack_Size; else return Size; end if; end Adjust_Storage_Size; ---------------------------- -- Default_Sec_Stack_Size -- ---------------------------- function Default_Sec_Stack_Size return Size_Type is Default_SS_Size : Integer; pragma Import (C, Default_SS_Size, "__gnat_default_ss_size"); begin -- There are two situations where the default secondary stack size is -- set to zero: -- -- * The user sets it to zero erroneously thinking it will disable -- the secondary stack. -- -- * Or more likely, we are building with an old compiler and -- Default_SS_Size is never set. -- -- In both case set the default secondary stack size to the run-time -- default. if Default_SS_Size > 0 then return Size_Type (Default_SS_Size); else return Runtime_Default_Sec_Stack_Size; end if; end Default_Sec_Stack_Size; ------------------------ -- Default_Stack_Size -- ------------------------ function Default_Stack_Size return Size_Type is Default_Stack_Size : Integer; pragma Import (C, Default_Stack_Size, "__gl_default_stack_size"); begin if Default_Stack_Size = -1 then return 2 * 1024 * 1024; else return Size_Type (Default_Stack_Size); end if; end Default_Stack_Size; ------------------------ -- Minimum_Stack_Size -- ------------------------ function Minimum_Stack_Size return Size_Type is begin -- 12K is required for stack-checking to work reliably on most platforms -- when using the GCC scheme to propagate an exception in the ZCX case. -- 16K is the value of PTHREAD_STACK_MIN under Linux, so is a reasonable -- default. return 16 * 1024; end Minimum_Stack_Size; end System.Parameters;