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Diffstat (limited to 'gcc/ada/s-stchop.ads')
| -rw-r--r-- | gcc/ada/s-stchop.ads | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/gcc/ada/s-stchop.ads b/gcc/ada/s-stchop.ads new file mode 100644 index 00000000000..10217204d6f --- /dev/null +++ b/gcc/ada/s-stchop.ads @@ -0,0 +1,74 @@ +------------------------------------------------------------------------------ +-- -- +-- GNU ADA 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) 1999-2004 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- -- +-- 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. -- +-- -- +-- 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. -- +-- -- +-- 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. + +with System.Storage_Elements; + +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. + +package System.Stack_Checking.Operations is + 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. + +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; |