1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . S E C O N D A R Y _ S T A C K --
10 -- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
35 with System
.Storage_Elements
;
37 package System
.Secondary_Stack
is
39 package SSE
renames System
.Storage_Elements
;
41 Default_Secondary_Stack_Size
: constant := 10 * 1024;
42 -- Default size of a secondary stack
45 (Stk
: System
.Address
;
46 Size
: Natural := Default_Secondary_Stack_Size
);
47 -- Initialize the secondary stack with a main stack of the given Size.
49 -- Stk is an "in" parameter that is already pointing to a memory area of
52 -- The secondary stack is fixed, and any attempt to allocate more than the
53 -- initial size will result in a Storage_Error being raised.
56 (Address
: out System
.Address
;
57 Storage_Size
: SSE
.Storage_Count
);
58 -- Allocate enough space for a 'Storage_Size' bytes object with Maximum
59 -- alignment. The address of the allocated space is returned in 'Address'
61 procedure SS_Free
(Stk
: in out System
.Address
);
62 -- Release the memory allocated for the Secondary Stack. That is to say,
63 -- all the allocated chuncks.
64 -- Upon return, Stk will be set to System.Null_Address
66 type Mark_Id
is private;
67 -- Type used to mark the stack.
69 function SS_Mark
return Mark_Id
;
70 -- Return the Mark corresponding to the current state of the stack
72 procedure SS_Release
(M
: Mark_Id
);
73 -- Restore the state of the stack corresponding to the mark M. If an
74 -- additional chunk have been allocated, it will never be freed during a
79 -- Unused entity that is just present to ease the sharing of the pool
80 -- mechanism for specific allocation/deallocation in the compiler
82 type Mark_Id
is new SSE
.Integer_Address
;
84 end System
.Secondary_Stack
;