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Diffstat (limited to 'gcc-4.4.0/gcc/ada/s-vmexta.adb')
| -rw-r--r-- | gcc-4.4.0/gcc/ada/s-vmexta.adb | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/gcc-4.4.0/gcc/ada/s-vmexta.adb b/gcc-4.4.0/gcc/ada/s-vmexta.adb new file mode 100644 index 000000000..51c94d6ca --- /dev/null +++ b/gcc-4.4.0/gcc/ada/s-vmexta.adb @@ -0,0 +1,187 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 1997-2009, 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 3, 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. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- 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 type SSL.Exception_Code; + + 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 : SSL.Exception_Code; + Except : SSL.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 : SSL.Exception_Code) return HTable_Headers; + function Get_Key (T : Exception_Code_Data_Ptr) return SSL.Exception_Code; + + 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 => SSL.Exception_Code, + Get_Key => Get_Key, + Hash => Hash, + Equal => "="); + + ------------------ + -- Base_Code_In -- + ------------------ + + function Base_Code_In + (Code : SSL.Exception_Code) return SSL.Exception_Code + is + begin + return Code and not 2#0111#; + end Base_Code_In; + + --------------------- + -- Coded_Exception -- + --------------------- + + function Coded_Exception + (X : SSL.Exception_Code) return SSL.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 SSL.Exception_Code + is + begin + return T.Code; + end Get_Key; + + ---------- + -- Hash -- + ---------- + + function Hash + (F : SSL.Exception_Code) return HTable_Headers + is + Headers_Magnitude : constant SSL.Exception_Code := + SSL.Exception_Code (HTable_Headers'Last - HTable_Headers'First + 1); + + begin + return HTable_Headers (F mod Headers_Magnitude + 1); + end Hash; + + ---------------------------- + -- Register_VMS_Exception -- + ---------------------------- + + procedure Register_VMS_Exception + (Code : SSL.Exception_Code; + E : SSL.Exception_Data_Ptr) + is + -- We bind the exception data with the base code found in the + -- input value, that is with the severity bits masked off. + + Excode : constant SSL.Exception_Code := Base_Code_In (Code); + + begin + -- The exception data registered here is mostly filled prior to this + -- call and by __gnat_error_handler when the exception is raised. We + -- still need to fill a couple of components for exceptions that will + -- be used as propagation filters (exception data pointer registered + -- as choices in the unwind tables): in some import/export cases, the + -- exception pointers for the choice and the propagated occurrence may + -- indeed be different for a single import code, and the personality + -- routine attempts to match the import codes in this case. + + E.Lang := 'V'; + E.Import_Code := Excode; + + if Exception_Code_HTable.Get (Excode) = null then + Exception_Code_HTable.Set (new Exception_Code_Data'(Excode, E, 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; |