+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- 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 --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- 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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