| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1997-2002, 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 System.HTable; |
| pragma Elaborate_All (System.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 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 => 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 |
| Excode : constant Integer := (Code / 8) * 8; |
| -- Mask off lower 3 bits which are the severity |
| |
| 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' |
| (Not_Handled_By_Others => False, |
| Lang => 'V', |
| Name_Length => 0, |
| Full_Name => null, |
| HTable_Ptr => null, |
| Import_Code => 0, |
| Raise_Hook => null), |
| 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; |
