--  LLVM back-end for ortho.
--  Copyright (C) 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.

package body Ortho_LLVM.Jit is
   --  procedure AddExternalFunction (Name : Cstring; Val : Address);
   --  pragma Import (C, AddExternalFunction, "ortho_AddExternalFunction");

   function GetPointerToFunction (EE : ExecutionEngineRef; Func : ValueRef)
                                 return Address;
   pragma Import (C, GetPointerToFunction, "LLVMGetPointerToFunction");

   --  Set address of non-defined global variables or functions.
   procedure Set_Address (Decl : O_Dnode; Addr : Address) is
   begin
      case Decl.Kind is
         when ON_Var_Decl | ON_Const_Decl =>
            AddGlobalMapping (Engine, Decl.LLVM, Addr);
         when ON_Subprg_Decl =>
            null;
            --  AddExternalFunction (GetValueName (Decl.LLVM), Addr);
         when others =>
            raise Program_Error;
      end case;
   end Set_Address;

   --  Get address of a global.
   function Get_Address (Decl : O_Dnode) return Address
   is
   begin
      case Decl.Kind is
         when ON_Var_Decl | ON_Const_Decl =>
            return GetPointerToGlobal (Engine, Decl.LLVM);
         when ON_Subprg_Decl =>
            return GetPointerToFunction (Engine, Decl.LLVM);
         when others =>
            raise Program_Error;
      end case;
   end Get_Address;

end Ortho_LLVM.Jit;