------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . V M S _ E X C E P T I O N _ T A B L E -- -- -- -- B o d y -- -- -- -- -- -- Copyright (C) 1997-2001, 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. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This is an Alpha/VMS package. with GNAT.HTable; pragma Elaborate_All (GNAT.HTable); package body System.VMS_Exception_Table is use System.Standard_Library; type HTable_Headers is range 1 .. 37; type Exception_Code_Data; type Exception_Code_Data_Ptr is access all Exception_Code_Data; -- The following record maps an imported VMS condition to an -- Ada exception. type Exception_Code_Data is record Code : Natural; Except : Exception_Data_Ptr; HTable_Ptr : Exception_Code_Data_Ptr; end record; procedure Set_HT_Link (T : Exception_Code_Data_Ptr; Next : Exception_Code_Data_Ptr); function Get_HT_Link (T : Exception_Code_Data_Ptr) return Exception_Code_Data_Ptr; function Hash (F : Natural) return HTable_Headers; function Get_Key (T : Exception_Code_Data_Ptr) return Natural; package Exception_Code_HTable is new GNAT.HTable.Static_HTable ( Header_Num => HTable_Headers, Element => Exception_Code_Data, Elmt_Ptr => Exception_Code_Data_Ptr, Null_Ptr => null, Set_Next => Set_HT_Link, Next => Get_HT_Link, Key => Natural, Get_Key => Get_Key, Hash => Hash, Equal => "="); --------------------- -- Coded_Exception -- --------------------- function Coded_Exception (X : Natural) return Exception_Data_Ptr is Res : Exception_Code_Data_Ptr; begin Res := Exception_Code_HTable.Get (X); if Res /= null then return Res.Except; else return null; end if; end Coded_Exception; ----------------- -- Get_HT_Link -- ----------------- function Get_HT_Link (T : Exception_Code_Data_Ptr) return Exception_Code_Data_Ptr is begin return T.HTable_Ptr; end Get_HT_Link; ------------- -- Get_Key -- ------------- function Get_Key (T : Exception_Code_Data_Ptr) return Natural is begin return T.Code; end Get_Key; ---------- -- Hash -- ---------- function Hash (F : Natural) return HTable_Headers is begin return HTable_Headers (F mod Natural (HTable_Headers'Last - HTable_Headers'First + 1) + 1); end Hash; ---------------------------- -- Register_VMS_Exception -- ---------------------------- procedure Register_VMS_Exception (Code : Integer) is -- Mask off lower 3 bits which are the severity Excode : Integer := (Code / 8) * 8; begin -- This allocates an empty exception that gets filled in by -- __gnat_error_handler when the exception is raised. Allocating -- it here prevents having to allocate it each time the exception -- is raised. if Exception_Code_HTable.Get (Excode) = null then Exception_Code_HTable.Set (new Exception_Code_Data' (Excode, new Exception_Data'(False, 'V', 0, null, null, 0), null)); end if; end Register_VMS_Exception; ----------------- -- Set_HT_Link -- ----------------- procedure Set_HT_Link (T : Exception_Code_Data_Ptr; Next : Exception_Code_Data_Ptr) is begin T.HTable_Ptr := Next; end Set_HT_Link; end System.VMS_Exception_Table;