------------------------------------------------------------------------------ -- -- -- 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) 1997-2013, 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 3, 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- 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 System.HTable; pragma Elaborate_All (System.HTable); with System.Storage_Elements; use System.Storage_Elements; package body System.VMS_Exception_Table is 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 : Exception_Code; Except : SSL.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 : Exception_Code) return HTable_Headers; function Get_Key (T : Exception_Code_Data_Ptr) return Exception_Code; package Exception_Code_HTable is new System.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 => Exception_Code, Get_Key => Get_Key, Hash => Hash, Equal => "="); ------------------ -- Base_Code_In -- ------------------ function Base_Code_In (Code : Exception_Code) return Exception_Code is begin return To_Address (To_Integer (Code) and not 2#0111#); end Base_Code_In; --------------------- -- Coded_Exception -- --------------------- function Coded_Exception (X : Exception_Code) return SSL.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 Exception_Code is begin return T.Code; end Get_Key; ---------- -- Hash -- ---------- function Hash (F : Exception_Code) return HTable_Headers is Headers_Magnitude : constant Exception_Code := Exception_Code (HTable_Headers'Last - HTable_Headers'First + 1); begin return HTable_Headers (To_Address ((To_Integer (F) mod To_Integer (Headers_Magnitude)) + 1)); end Hash; ---------------------------- -- Register_VMS_Exception -- ---------------------------- procedure Register_VMS_Exception (Code : Exception_Code; E : SSL.Exception_Data_Ptr) is -- We bind the exception data with the base code found in the -- input value, that is with the severity bits masked off. Excode : constant Exception_Code := Base_Code_In (Code); begin -- The exception data registered here is mostly filled prior to this -- call and by __gnat_error_handler when the exception is raised. We -- still need to fill a couple of components for exceptions that will -- be used as propagation filters (exception data pointer registered -- as choices in the unwind tables): in some import/export cases, the -- exception pointers for the choice and the propagated occurrence may -- indeed be different for a single import code, and the personality -- routine attempts to match the import codes in this case. E.Lang := 'V'; E.Foreign_Data := Excode; if Exception_Code_HTable.Get (Excode) = null then Exception_Code_HTable.Set (new Exception_Code_Data'(Excode, E, 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;