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---  GHDL Run Time (GRT) - process stacks.
---  Copyright (C) 2002 - 2014 Tristan Gingold
---
---  GHDL is free software; you can redistribute it and/or modify it under
---  the terms of the GNU General Public License as published by the Free
---  Software Foundation; either version 2, or (at your option) any later
---  version.
---
---  GHDL is distributed in the hope that it will be useful, but WITHOUT 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
---  along with GCC; see the 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.
-with System; use System;
-with Ada.Unchecked_Conversion;
-
-package Grt.Stacks is
-   --  Instance is the parameter of the process procedure.
-   --  This is in fact a fully opaque type whose content is private to the
-   --  process.
-   type Instance is limited private;
-   type Instance_Acc is access all Instance;
-   pragma Convention (C, Instance_Acc);
-
-   --  A process is identified by a procedure having a single private
-   --  parameter (its instance).
-   type Proc_Acc is access procedure (Self : Instance_Acc);
-   pragma Convention (C, Proc_Acc);
-
-   function To_Address is new Ada.Unchecked_Conversion
-     (Instance_Acc, System.Address);
-
-   type Stack_Type is new Address;
-   Null_Stack : constant Stack_Type := Stack_Type (Null_Address);
-
-   --  Initialize the stacks package.
-   --  This may adjust stack sizes.
-   --  Must be called after grt.options.decode.
-   procedure Stack_Init;
-
-   --  Create a new stack, which on first execution will call FUNC with
-   --  an argument ARG.
-   function Stack_Create (Func : Proc_Acc; Arg : Instance_Acc)
-                         return Stack_Type;
-
-   --  Resume stack TO and save the current context to the stack pointed by
-   --  CUR.
-   procedure Stack_Switch (To : Stack_Type; From : Stack_Type);
-
-   --  Delete stack STACK, which must not be currently executed.
-   procedure Stack_Delete (Stack : Stack_Type);
-
-   --  Error during stack handling:
-   --  Cannot grow the stack.
-   procedure Error_Grow_Failed;
-   pragma No_Return (Error_Grow_Failed);
-
-   --  Invalid memory access detected (other than dereferencing a NULL access).
-   procedure Error_Memory_Access;
-   pragma No_Return (Error_Memory_Access);
-
-   --  A NULL access is dereferenced.
-   procedure Error_Null_Access;
-   pragma No_Return (Error_Null_Access);
-private
-   type Instance is null record;
-
-   pragma Import (C, Stack_Init, "grt_stack_init");
-   pragma Import (C, Stack_Create, "grt_stack_create");
-   pragma Import (C, Stack_Switch, "grt_stack_switch");
-   pragma Import (C, Stack_Delete, "grt_stack_delete");
-
-   pragma Export (C, Error_Grow_Failed, "grt_stack_error_grow_failed");
-   pragma Export (C, Error_Memory_Access, "grt_stack_error_memory_access");
-   pragma Export (C, Error_Null_Access, "grt_stack_error_null_access");
-end Grt.Stacks;