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Diffstat (limited to 'gcc/ada/1ssecsta.ads')
| -rw-r--r-- | gcc/ada/1ssecsta.ads | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/gcc/ada/1ssecsta.ads b/gcc/ada/1ssecsta.ads new file mode 100644 index 00000000000..a2212e5dd67 --- /dev/null +++ b/gcc/ada/1ssecsta.ads @@ -0,0 +1,85 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . S E C O N D A R Y _ S T A C K -- +-- -- +-- S p e c -- +-- -- +-- $Revision$ +-- -- +-- Copyright (C) 1992-2001 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 2, 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 GNAT; 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. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +with System.Storage_Elements; + +package System.Secondary_Stack is + + package SSE renames System.Storage_Elements; + + Default_Secondary_Stack_Size : constant := 10 * 1024; + -- Default size of a secondary stack + + procedure SS_Init + (Stk : System.Address; + Size : Natural := Default_Secondary_Stack_Size); + -- Initialize the secondary stack with a main stack of the given Size. + -- + -- Stk is an "in" parameter that is already pointing to a memory area of + -- size Size. + -- + -- The secondary stack is fixed, and any attempt to allocate more than the + -- initial size will result in a Storage_Error being raised. + + procedure SS_Allocate + (Address : out System.Address; + Storage_Size : SSE.Storage_Count); + -- Allocate enough space for a 'Storage_Size' bytes object with Maximum + -- alignment. The address of the allocated space is returned in 'Address' + + procedure SS_Free (Stk : in out System.Address); + -- Release the memory allocated for the Secondary Stack. That is to say, + -- all the allocated chuncks. + -- Upon return, Stk will be set to System.Null_Address + + type Mark_Id is private; + -- Type used to mark the stack. + + function SS_Mark return Mark_Id; + -- Return the Mark corresponding to the current state of the stack + + procedure SS_Release (M : Mark_Id); + -- Restore the state of the stack corresponding to the mark M. If an + -- additional chunk have been allocated, it will never be freed during a + +private + + SS_Pool : Integer; + -- Unused entity that is just present to ease the sharing of the pool + -- mechanism for specific allocation/deallocation in the compiler + + type Mark_Id is new SSE.Integer_Address; + +end System.Secondary_Stack; |