New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 102 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         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: 1.21 $
+--                                                                          --
+--          Copyright (C) 1992-1999 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 : in out System.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
+   --  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
+   --  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.
+   --
+   --  Note: the reason that Stk is passed is that SS_Init is called before
+   --  the proper interface is established to obtain the address of the
+   --  stack using System.Soft_Links.Get_Sec_Stack_Addr.
+
+   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
+
+   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
+   --  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;
+
+end System.Secondary_Stack;