obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 82 insertions, 0 deletions

diff --git a/gcc/ada/s-stchop.ads b/gcc/ada/s-stchop.ads
new file mode 100644
index 000000000..014eddc41
--- /dev/null
+++ b/gcc/ada/s-stchop.ads
@@ -0,0 +1,82 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                 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 . O P E R A T I O N S      --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--          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 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/>.                                          --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University.       --
+-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package provides a implementation of stack checking operations using
+--  comparison with stack base and limit.
+
+pragma Restrictions (No_Elaboration_Code);
+--  We want to guarantee the absence of elaboration code because the binder
+--  does not handle references to this package.
+
+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.
+
+with System.Storage_Elements;
+
+package System.Stack_Checking.Operations is
+   pragma Preelaborate;
+
+   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.
+   --
+   --  The stack cache should contain the bounds of the current task.  But
+   --  because the RTS is not aware of task switches, the stack cache may be
+   --  incorrect.  So when the stack pointer is not within the bounds of the
+   --  stack cache, Stack_Check first update the cache (which is a costly
+   --  operation hence the need of a cache).
+
+   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
+
+   procedure Notify_Stack_Attributes
+     (Initial_SP : System.Address;
+      Size       : System.Storage_Elements.Storage_Offset);
+   --  Register Initial_SP as the initial stack pointer value for the current
+   --  task when it starts and Size as the associated stack area size. This
+   --  should be called once, after the soft-links have been initialized and
+   --  prior to the first "Stack_Check" call.
+
+private
+   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.Operations;