-- --
-- S p e c --
-- --
--- $Revision: 1.1 $
--- --
--- Copyright (C) 1992-1999 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2004 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- --
-- 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). --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
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
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.
--
-- If System.Parameters.Sec_Stack_Ratio equals Dynamic, Stk is really an
- -- "out" parameter that will be allocated on the heap. Then all further
+ -- OUT parameter that will be allocated on the heap. Then all further
-- allocations which do not overflow the main stack will not generate
-- dynamic (de)allocation calls. If the main Stack overflows, a new
-- chuck of at least the same size will be allocated and linked to the
-- previous chunk.
--
- -- Otherwise (Sec_Stack_Ratio between 0 and 100), Stk is an "in" parameter
+ -- 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
-- result in a Storage_Error being raised.
-- 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
-- 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
+ 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);
procedure SS_Info;
-- Debugging procedure used to print out secondary Stack allocation
-- information. This procedure is generic in order to avoid a direct
- -- dependence on a particular IO package.
+ -- dependance on a particular IO package.
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;
+ 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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