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------------------------------------------------------------------------------
-- --
-- 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;
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