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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;