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Diffstat (limited to 'gcc/ada/s-vmexta.adb')
| -rw-r--r-- | gcc/ada/s-vmexta.adb | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/gcc/ada/s-vmexta.adb b/gcc/ada/s-vmexta.adb new file mode 100644 index 00000000000..2be1ae1ada2 --- /dev/null +++ b/gcc/ada/s-vmexta.adb @@ -0,0 +1,164 @@ +------------------------------------------------------------------------------ +-- -- +-- 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: 1.7 $ +-- -- +-- 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. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +-- 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; |