------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . S T A C K _ C H E C K I N G --
-- --
-- S p e c --
-- --
--- --
--- Copyright (C) 1999-2001 Free Software Foundation, Inc. --
+-- Copyright (C) 1999-2009, Free Software Foundation, Inc. --
-- --
-- GNARL 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 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- 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. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- 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/>. --
-- --
--- GNARL was developed by the GNARL team at Florida State University. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This package provides a system-independent implementation of stack
-- checking using comparison with stack base and limit.
-with System.Storage_Elements;
+-- This package defines basic types and objects. Operations related to
+-- stack checking can be found in package System.Stack_Checking.Operations.
-pragma Polling (Off);
--- Turn off polling, we do not want polling to take place during stack
--- checking operations. It causes infinite loops and other problems.
+pragma Compiler_Unit;
+
+with System.Storage_Elements;
package System.Stack_Checking is
+ pragma Preelaborate;
+ pragma Elaborate_Body;
+ -- This unit has a junk null body. The reason is that historically we
+ -- used to have a real body, and it causes bootstrapping path problems
+ -- to eliminate it, since the old body may still be present in the
+ -- compilation environment for a build.
+
type Stack_Info is record
Limit : System.Address := System.Null_Address;
Base : System.Address := System.Null_Address;
-- upgrowing stack) may contain any address that is part of another stack.
-- The Stack_Access may be part of a larger data structure.
- Multi_Processor : constant Boolean := False; -- Not supported yet
-
- ----------------------
- -- Client Interface --
- ----------------------
-
- procedure Set_Stack_Size
- (Stack_Size : System.Storage_Elements.Storage_Offset);
- -- Specify the stack size for the current task.
-
- procedure Update_Stack_Cache (Stack : Stack_Access);
- -- Set the stack cache for the current task. Note that this is only
- -- for optimization purposes, nothing can be assumed about the
- -- contents of the cache at any time, see Set_Stack_Info.
-
- procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access);
- -- Invalidate cache entries for the task T that owns Any_Stack.
- -- This causes the Set_Stack_Info function to be called during
- -- the next stack check done by T. This can be used to interrupt
- -- task T asynchronously.
- -- Stack_Check should be called in loops for this to work reliably.
-
- function Stack_Check (Stack_Address : System.Address) return Stack_Access;
- -- This version of Stack_Check should not be inlined.
+ Multi_Processor : constant Boolean := False; -- Not supported yet
private
(Limit => System.Null_Address,
Base => System.Null_Address,
Size => 0);
- -- Use explicit assignment to avoid elaboration code (call to _init_proc).
+ -- Use explicit assignment to avoid elaboration code (call to init proc)
- Null_Stack : constant Stack_Access := Null_Stack_Info'Access;
+ Null_Stack : constant Stack_Access := Null_Stack_Info'Access;
-- Stack_Access value that will return a Stack_Base and Stack_Limit
-- that fail any stack check.
- Cache : aliased Stack_Access := Null_Stack;
-
- pragma Export (C, Cache, "_gnat_stack_cache");
- pragma Export (C, Stack_Check, "_gnat_stack_check");
-
end System.Stack_Checking;
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