1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . V M S _ E X C E P T I O N _ T A B L E --
11 -- Copyright (C) 1997-2001, Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNAT was originally developed by the GNAT team at New York University. --
32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 -- This is an Alpha/VMS package.
39 pragma Elaborate_All (GNAT.HTable);
41 package body System.VMS_Exception_Table is
43 use System.Standard_Library;
45 type HTable_Headers is range 1 .. 37;
47 type Exception_Code_Data;
48 type Exception_Code_Data_Ptr is access all Exception_Code_Data;
50 -- The following record maps an imported VMS condition to an
53 type Exception_Code_Data is record
55 Except : Exception_Data_Ptr;
56 HTable_Ptr : Exception_Code_Data_Ptr;
60 (T : Exception_Code_Data_Ptr;
61 Next : Exception_Code_Data_Ptr);
63 function Get_HT_Link (T : Exception_Code_Data_Ptr)
64 return Exception_Code_Data_Ptr;
66 function Hash (F : Natural) return HTable_Headers;
67 function Get_Key (T : Exception_Code_Data_Ptr) return Natural;
69 package Exception_Code_HTable is new GNAT.HTable.Static_HTable (
70 Header_Num => HTable_Headers,
71 Element => Exception_Code_Data,
72 Elmt_Ptr => Exception_Code_Data_Ptr,
74 Set_Next => Set_HT_Link,
85 function Coded_Exception (X : Natural) return Exception_Data_Ptr is
86 Res : Exception_Code_Data_Ptr;
89 Res := Exception_Code_HTable.Get (X);
103 function Get_HT_Link (T : Exception_Code_Data_Ptr)
104 return Exception_Code_Data_Ptr is
113 function Get_Key (T : Exception_Code_Data_Ptr) return Natural is
122 function Hash (F : Natural) return HTable_Headers is
124 return HTable_Headers
125 (F mod Natural (HTable_Headers'Last - HTable_Headers'First + 1) + 1);
128 ----------------------------
129 -- Register_VMS_Exception --
130 ----------------------------
132 procedure Register_VMS_Exception (Code : Integer) is
133 -- Mask off lower 3 bits which are the severity
135 Excode : Integer := (Code / 8) * 8;
138 -- This allocates an empty exception that gets filled in by
139 -- __gnat_error_handler when the exception is raised. Allocating
140 -- it here prevents having to allocate it each time the exception
143 if Exception_Code_HTable.Get (Excode) = null then
144 Exception_Code_HTable.Set
145 (new Exception_Code_Data'
147 new Exception_Data'(False, 'V', 0, null, null, 0),
150 end Register_VMS_Exception;
156 procedure Set_HT_Link
157 (T : Exception_Code_Data_Ptr;
158 Next : Exception_Code_Data_Ptr)
161 T.HTable_Ptr := Next;
164 end System.VMS_Exception_Table;