-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2003 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2009, 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- --
+-- 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 GNAT; 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, 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. --
+-- 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
+pragma Compiler_Unit;
+
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
+ Default_Secondary_Stack_Size : Natural := 10 * 1024;
+ -- Default size of a secondary stack. May be modified by binder -D switch
+ -- which causes the binder to generate an appropriate assignment in the
+ -- binder generated file.
procedure SS_Init
- (Stk : in out System.Address;
+ (Stk : in out Address;
Size : Natural := Default_Secondary_Stack_Size);
-- Initialize the secondary stack with a main stack of the given Size.
--
--
-- Otherwise (Sec_Stack_Ratio between 0 and 100), Stk is an IN parameter
-- that is already pointing to a Stack_Id. The secondary stack in this case
- -- is fixed, and any attempt to allocated more than the initial size will
+ -- is fixed, and any attempt to allocate more than the initial size will
-- result in a Storage_Error being raised.
--
-- Note: the reason that Stk is passed is that SS_Init is called before
-- stack using System.Soft_Links.Get_Sec_Stack_Addr.
procedure SS_Allocate
- (Address : out System.Address;
+ (Addr : out 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'
+ -- alignment. The address of the allocated space is returned in Addr.
- 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
+ procedure SS_Free (Stk : in out Address);
+ -- Release the memory allocated for the Secondary Stack. That is
+ -- to say, all the allocated chunks. Upon return, Stk will be set
+ -- to System.Null_Address.
type Mark_Id is private;
- -- Type used to mark the stack.
+ -- Type used to mark the stack for mark/release processing
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
+ -- ??? missing comment here
+
+ function SS_Get_Max return Long_Long_Integer;
+ -- Return maximum used space in storage units for the current secondary
+ -- stack. For a dynamically allocated secondary stack, the returned
+ -- result is always -1. For a statically allocated secondary stack,
+ -- the returned value shows the largest amount of space allocated so
+ -- far during execution of the program to the current secondary stack,
+ -- i.e. the secondary stack for the current task.
generic
with procedure Put_Line (S : String);
-- 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;
+ type SS_Ptr is new SSE.Integer_Address;
+ -- Stack pointer value for secondary stack
+
+ type Mark_Id is record
+ Sstk : System.Address;
+ Sptr : SS_Ptr;
+ end record;
+ -- A mark value contains the address of the secondary stack structure,
+ -- as returned by System.Soft_Links.Get_Sec_Stack_Addr, and a stack
+ -- pointer value corresponding to the point of the mark call.
end System.Secondary_Stack;
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