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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [s-stchop.ads] - Blame information for rev 281

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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
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--                                                                          --
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--     S Y S T E M . S T A C K _ C H E C K I N G . O P E R A T I O N S      --
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--                                                                          --
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--                                  S p e c                                 --
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--                                                                          --
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--          Copyright (C) 1999-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNARL is free software; you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNARL was developed by the GNARL team at Florida State University.       --
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-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides a implementation of stack checking operations using
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--  comparison with stack base and limit.
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pragma Restrictions (No_Elaboration_Code);
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--  We want to guarantee the absence of elaboration code because the binder
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--  does not handle references to this package.
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pragma Polling (Off);
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--  Turn off polling, we do not want polling to take place during stack
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--  checking operations. It causes infinite loops and other problems.
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with System.Storage_Elements;
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package System.Stack_Checking.Operations is
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   pragma Preelaborate;
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   procedure Update_Stack_Cache (Stack : Stack_Access);
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   --  Set the stack cache for the current task. Note that this is only for
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   --  optimization purposes, nothing can be assumed about the contents of the
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   --  cache at any time, see Set_Stack_Info.
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   --
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   --  The stack cache should contain the bounds of the current task.  But
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   --  because the RTS is not aware of task switches, the stack cache may be
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   --  incorrect.  So when the stack pointer is not within the bounds of the
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   --  stack cache, Stack_Check first update the cache (which is a costly
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   --  operation hence the need of a cache).
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   procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access);
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   --  Invalidate cache entries for the task T that owns Any_Stack. This causes
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   --  the Set_Stack_Info function to be called during the next stack check
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   --  done by T. This can be used to interrupt task T asynchronously.
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   --  Stack_Check should be called in loops for this to work reliably.
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   function Stack_Check (Stack_Address : System.Address) return Stack_Access;
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   --  This version of Stack_Check should not be inlined
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   procedure Notify_Stack_Attributes
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     (Initial_SP : System.Address;
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      Size       : System.Storage_Elements.Storage_Offset);
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   --  Register Initial_SP as the initial stack pointer value for the current
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   --  task when it starts and Size as the associated stack area size. This
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   --  should be called once, after the soft-links have been initialized and
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   --  prior to the first "Stack_Check" call.
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private
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   Cache : aliased Stack_Access := Null_Stack;
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   pragma Export (C, Cache, "_gnat_stack_cache");
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   pragma Export (C, Stack_Check, "_gnat_stack_check");
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end System.Stack_Checking.Operations;

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