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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [s-secsta.ads] - Blame information for rev 281

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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--               S Y S T E M . S E C O N D A R Y _ S T A C K                --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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pragma Compiler_Unit;
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with System.Storage_Elements;
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package System.Secondary_Stack is
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   package SSE renames System.Storage_Elements;
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   Default_Secondary_Stack_Size : Natural := 10 * 1024;
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   --  Default size of a secondary stack. May be modified by binder -D switch
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   --  which causes the binder to generate an appropriate assignment in the
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   --  binder generated file.
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   procedure SS_Init
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     (Stk  : in out Address;
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      Size : Natural := Default_Secondary_Stack_Size);
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   --  Initialize the secondary stack with a main stack of the given Size.
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   --
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   --  If System.Parameters.Sec_Stack_Ratio equals Dynamic, Stk is really an
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   --  OUT parameter that will be allocated on the heap. Then all further
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   --  allocations which do not overflow the main stack will not generate
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   --  dynamic (de)allocation calls. If the main Stack overflows, a new
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   --  chuck of at least the same size will be allocated and linked to the
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   --  previous chunk.
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   --
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   --  Otherwise (Sec_Stack_Ratio between 0 and 100), Stk is an IN parameter
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   --  that is already pointing to a Stack_Id. The secondary stack in this case
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   --  is fixed, and any attempt to allocate more than the initial size will
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   --  result in a Storage_Error being raised.
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   --
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   --  Note: the reason that Stk is passed is that SS_Init is called before
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   --  the proper interface is established to obtain the address of the
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   --  stack using System.Soft_Links.Get_Sec_Stack_Addr.
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   procedure SS_Allocate
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     (Addr         : out Address;
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      Storage_Size : SSE.Storage_Count);
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   --  Allocate enough space for a 'Storage_Size' bytes object with Maximum
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   --  alignment. The address of the allocated space is returned in Addr.
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   procedure SS_Free (Stk : in out Address);
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   --  Release the memory allocated for the Secondary Stack. That is
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   --  to say, all the allocated chunks. Upon return, Stk will be set
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   --  to System.Null_Address.
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   type Mark_Id is private;
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   --  Type used to mark the stack for mark/release processing
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   function SS_Mark return Mark_Id;
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   --  Return the Mark corresponding to the current state of the stack
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   procedure SS_Release (M : Mark_Id);
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   --  Restore the state of the stack corresponding to the mark M. If an
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   --  additional chunk have been allocated, it will never be freed during a
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   --  ??? missing comment here
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   function SS_Get_Max return Long_Long_Integer;
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   --  Return maximum used space in storage units for the current secondary
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   --  stack. For a dynamically allocated secondary stack, the returned
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   --  result is always -1. For a statically allocated secondary stack,
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   --  the returned value shows the largest amount of space allocated so
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   --  far during execution of the program to the current secondary stack,
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   --  i.e. the secondary stack for the current task.
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   generic
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      with procedure Put_Line (S : String);
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   procedure SS_Info;
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   --  Debugging procedure used to print out secondary Stack allocation
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   --  information. This procedure is generic in order to avoid a direct
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   --  dependance on a particular IO package.
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private
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   SS_Pool : Integer;
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   --  Unused entity that is just present to ease the sharing of the pool
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   --  mechanism for specific allocation/deallocation in the compiler
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   type SS_Ptr is new SSE.Integer_Address;
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   --  Stack pointer value for secondary stack
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   type Mark_Id is record
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      Sstk : System.Address;
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      Sptr : SS_Ptr;
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   end record;
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   --  A mark value contains the address of the secondary stack structure,
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   --  as returned by System.Soft_Links.Get_Sec_Stack_Addr, and a stack
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   --  pointer value corresponding to the point of the mark call.
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end System.Secondary_Stack;

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